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Electrical Cali Flashcards

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1
Q

In pressurized enclosures of Class 1 Div 1, where the conduit is not part of the system, conduit seal offs shall be installed ___ inches from the pressurized cabinet.

A

501.15(A)(2)

18 inches

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2
Q

Which of the following is not an acceptable means of connecting a ground path?

A

250.8 (B)

Solid solder connection

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3
Q

An electric car plug with a 7000 watt/ 208 volt 3 phase rating will require a ___ amp fuse.

A

7000watts ÷ ( 208 Volts (1.73)) = 19.45 amps

19.45 A × 125 % = 24.31 or 25 amp fuse.

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4
Q

All markings on conductors or electrical materials requiring markings shall have markings that will withstand _________.

A

110.12

The environment involved.

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5
Q

In a Class 1 Div 2 environment, all the threaded conduit entries shall be engaged a minimum of ____ threads NPT

a) 2
b) 3
c) 4
d) 5

A
  1. 8 (E)(1)

d) 5 threads

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6
Q

The conductors between the utility interactive inverter and the service equipment, such as a utility is the ______.

a) Utility-interactive Inverter Output ckt
b) Inverter-Output connection
c) Inverter service feed
d) none of the above

A
  1. 2 Definition

a) Utility - Interactive Inverter Output ckt

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7
Q

Which type communication cable is designed to ensure continued operations of critical circuits under fire conditions?

a) CMR cable
b) CI cable
c) CM cable
d) CMX cable

A
  1. 2 Definitions

b) CI cable (similar to mineral insulated)

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8
Q

Which of the following is not considered an interconnected electric power source?

a) Solar Voltaic system
b) Fuel cell sytem
c) batteries
d) generator

A
  1. 2 Definitions

c) Batteries

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9
Q

Edison ‘type S’ fuse holders shall be used

a) for replacement only
b) as noninterchangeable with lower amp classifications
c) with non-removeable adapters
d) all of the above

A
  1. 51

d) all of the above

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10
Q

The working space in front of electrical equipment 600 volts or less shall not be used for _______.

a) storage
b) guarded
c) illuminated
d) none of the above

A
  1. 26

a) storage

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11
Q

Fixed ladders, in vaults, shall be ______.

a) Alluminum
b) Corrosion resistant
c) Fiberglass
d) Locked from the inside

A
  1. 79

b) Corrosion resistant

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12
Q

Each Multiwire branch circuit shall ______ all ungrounded conductors.

a) group
b) open
c) close
d) simultaneously disconnect

A
  1. 4(B)

d) simultaneously disconnet

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13
Q

Floor outlets shall not be counted unless located with in _____ inches of the wall.

a) 6 in
b) 12 in
c) 18 in
d) 24 in

A
  1. 52(A)(3)

c) 18 inches

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14
Q

The grounded conductor of the parallel service enterance shall not be small than _______.

a) 1/0
b) 2/0
c) 3/0
d) 250 mcm

A
  1. 24(C)(2)

a) 1/0

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15
Q

Location of service equipment disconnecting means shall be ________.

a) within sight from
b) readily accesible
c) both a + b
d) neither a or b

A
  1. 70(A)(1)

b) readily accesible

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16
Q

For fixed outdoor snow melting equipment, grounding sheaths or braids shall be permitted to be embedded in ________.

a) asphalt
b) masonry
c) both a + b
d) neither a or b

A
  1. 22(A)

c) both a + b

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17
Q

In motion picture locations, DC plugging boxes shall be rated not less than ____ amps.

a) 20
b) 30
c) 40
d) 50

A
  1. 14

b) 30 amp

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18
Q

The power supply to a mobile home shall not have more than one listed _____ amp attachment plug.

a) 30
b) 40
c) 50
d) 60

A
  1. 43(A)

c) 50

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19
Q

Lighting circuits for recreational vehicle switches shall not be rated less than ______ amps.

a) 5
b) 10
c) 15
d) 20

A
  1. 51(A)(1)

b) 10

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20
Q

Each tenant space for sign or outline lighting (stirp mall, box stores, etc) shall be supplied by a branch circuit rated at least ____ amps.

a) 15
b) 20
c) 30
d) 40

A
  1. 5(A)

b) 20

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21
Q

Branch circuit power for audio system equipment shall no be placed, laterally, within _____feet to the inside of the pool wall.

a) 3 feet
b) 5 feet
c) 6 feet
d) 10 feet

A
  1. 10

b) 5 feet

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22
Q

Electric vehicle charging loads shall not be considered continuous loads.

a) T
b) F

A
  1. 42

b) False , EVC are continous loads 125%

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23
Q

Which of the following is true of a conductor that has good insulation?

a) When tested, the insulation will have a high resistance
b) It can be used only in wet locations
c) When tested, the insulation will have a low resistance.
d) It can be used only in dry locations

A

a) When tested, the insulation will have a high resistance

The conductor should have a low resistance in order to allow sufficient current flow but the resistance of the insulation should be high so that the current and voltage stays within the conductor. Keeping other non current carrying metal raceways and enclosures from becoming energized.

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24
Q

What is the approximate power AP of a 7.5 HP motor?

a) 5595 Watts
b) 4350 Watts
c) 6204 Watts
d) 7215 Watts

A

a) 5595 Watts
7. 5 x 746 = 5595 Watts

1 HP = 746 Watts

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25
Which of the following is used to apply DC voltage to a wire or busbar in order to test the resistance of the wire or busbar? a) Ohms meter b) True RMS meter c) Inductance tester d) Megger
d) Megger
26
The term "within sight from" requires it to be seen and with in ____ feet. a) 20 b) 30 c) 40 d) 50
100 definitions d) 50 feet
27
When conductors are ran inside a cabinet, containing a panel board and splice or tap, the conductor fill shall be a maximum of _____%. a) 20 b) 40 c) 60 d) 75
312. 8 | d) 75%
28
When installed in a bundle in a communications tray, which type of circuit is not permitted in the same raceway? a) Power limited fire alarm circuit b) Class 2 & 3 remote control, signaling, power limited circuit c) Class 1 circuits d) community antenae television and radio circuits
800. 133(A) + (B) | c) Class 1 circuits
29
An accomidation with 2 or more contiguous rooms comprising a compartment, with or without doors in between such rooms, that provide living, sleeping, sanitary, & storage facilities is a ______. a) motel b) guest suite c) guest room d) apt
100 Definitions b) guest suite
30
Where a single receptacle is mounted in a hallway wall, the wall can be no wider than ____ feet. a) 6 feet b) 8 feet c) 10 feet d) 12 feet
c) 10 feet | 210. 52(H)
31
Illumination shall be provided for all ______ about service equipment installed indoors. a) working spaces b) storage spaces c) walls d) none of the above
a) working spaces | 110. 34(D)
32
Multi conductor flat cable shall have a ______ on the grounded conductor. a) distinctive white or gray marking b) marking and identifying it throughout its length c) neither a or b d) both a & b
d) both a & b | 322. 120(B)
33
Resturant lighting shall be _____ volt/amps per sq ft. a) 22 b) 33 c) 3 d) 2
d) 2 Table 220.12
34
Flourescent luminares that utilize double ended lamps with ballast, shall have disconnecting means ________. a) Internal b) External c) a or b d) neither
c) a or b 410. 130(G) Internal or external disconnect
35
A dishwasher shall be cord and plug connected if it ______. a) is accessible (not behind the dishwasher/adjacent) b) is 3 to 4 feet in length c) located to avoid physical damage d) all of the above
d) all of the above
36
For fixed electric heating equipment for pipeline and vessels, cord and plug connected equipment, rated ______, shall be permitted to be the disconnecting means. a) 15 amps or less b) 20 amps or less c) 30 amps or less d) none of the above
b) 20 amps or less | 427. 55(B)
37
Generators shall have a nameplate giving ______. a) manufactures name b) frequency c) power factor d) all of the above
d) all of the above | 445. 11
38
A hybrid power source may include _______. a) photo voltaic b) wind c) engine driven generators d) all of the above
d) all of the above | 705. 2
39
A border light installed on a stage is a ________. a) permanent overhead strip light b) footlight c) floodlight d) portable light
a) permanent overhead strip fixture | 520. 2 Definitions
40
Each motion picture projector shall have a clear working space of not less that ______ inches. a) 15" b) 24" c) 30" d) 36"
c) 30 inches | 540. 12
41
When installed in other than raceways, cable trays, boxes or cables, communications wires and cables shall be seperated from electric light, power, class 1 circuits by _____ inches. a) 2" b) 3" c) 4" d) 6"
a) 2 inches | 800. 133(A)(2)
42
In an occupancy of more than 100 people, a temporary moveable switchboard shall use _____ cable. a) portable extra hard usage b) twisted portable c) jacketed tinsel d) parallel twisted
a) portable extra hard usage | 518. 3(B)
43
Knob and tube wiring supports, when required to be rigidly supported, shall not be more than _____ feet apart. a) 2.5 feet b) 3 feet c) 4.5 feet d) 6 feet
c) 4.5 feet | 394. 30(A)(2(
44
A luminaire labeled ______ shall be allowed to be in contact with insulation. a) LI b) IC c) O d) DP
b) IC | 410. 16(A)(2)
45
When determining the minimum required working space for a panelboard, which of the following is condition 3? a) exposed live parts on both sides b) exposed live parts on one side c) exposed live parts on one side and grounded objects on the other side d) exposed live parts on one side and concrete wall on the other side
a) exposed live parts on both sides of the working space | 110. 26(A)(1)
46
Where is a GFCI protection required for 125 volt single phase, 15-and 20-ampere receptacles? a) restaurant dining room b) dept. store show window c) restaurant kitchen d) doctors office
c) restaurant kitchen | 210. 8(B)
47
When is a light switch required at each interior floor level of a dwelling unit staircase? a) more than 6 stair risers b) more than 4 stair risers c) less than 6 stair risers d) 6 or more stair risers
d) 6 or more stair risers | 210. 70(A)(2)(c)
48
What is the maximum voltage that coaxial cable can supply power to equipment that is directly associated with the community antenna television and radio distribution system? a) 40 V b) 80 V c) 60 V d) 50 V
c) 60 V | 820. 15
49
What is the temperature (in degrees) adder for a rooftop raceway mounted 6 inches above the rooftop? a) 33*C b) 14*C c) 40*F d) 30*F
d) 30*F | 310. 15(B)(3)(c)
50
Where passing through a floor, what is the maximum height above the floor that multi conductor non power limited fire alarm circuit cable must be installed in a metal raceway? a) 8 feet above floor b) 6 feet above floor c) 6 inches above floor d) 7 feet above floor
d) 7 feet above finished floor | 760. 53(A)(2)
51
What is the maximum percentage of the cross sectional area that conductors, splices, and taps can occupy in a cabinet that encloses a panelboard? a) 75% b) 50% c) 40% d) 60%
a) 75% | 312. 8
52
What is the total value in VA for the 2 kitchen small appliance circuits required at a dwelling? a) 4500 VA b) 3000 VA c) 1200 VA d) 1500 VA
b) 3000 VA 220. 52(A) Each 2 wire kitchen and laundry branch circuit shall be calculated at 1500 VA. 2 x 1500 VA = 3000 VA
53
Which of the following flexible cords can be used in a show window or showcase? a) SEW b) SRD c) SVE d) SPE-1
a) SEW | 400. 11
54
If the attic is accessible only by a portable ladder, an AC cable requires protection if located within ______ feet of an attic enterance. a) 4' b) 7' c) 6' d) 8'
c) 6 feet | 320. 23(A)
55
Which of the following applies to a group of 6 service disconnect switches? a) should be more than 50 feet apart b) must be marked to indicate load served c) must be within 25 feet of the load served d) must be marked to identify them as a " main disconnect"
b) must be marked to indicate load served | 230. 72(A)
56
What is the minimum width for the workspace required in front of a 277/480 volt panelboard? a) 36 inches b) 48 inches c) 30 inches d) 42 inches
c) 30 inches 110. 26(A)(1)(b) minimum work space width for electrical equipment is the width of the equipment or 30 inches, whichever is greater.
57
The rating of a branch circuit is determined by a) the size of the overcurrent device b) the conductor size c) 125% of the load d) equipment nameplate
a) the size of the overcurrent device | 210. 3
58
A supplemental ground rod is not required if the first ground rod: a) is bonded to an above ground water pipe b) is 10 foot long c) has a resistance to earth of 25 ohms or less d) is a listed ground rod
c) has a resistance to earth of 25 ohms or less 250. 53(A)(2) Exception A single rod, pipe, or plate electrode shall be supplemented by an additional electrode unless the first electrode has a resistance to earth of 25 ohms or less.
59
Ground fault protection is required in WYE connected services of more than 150 V to ground, but not more than 1000 V phase to phase for each service disconnect rated: a) 600 amps b) 800 amps c) less than 1000 amps d) 1000 amps or larger
d) 1000 amps or larger | 230. 95 Each service disconnect rated 1000 amps or more requires ground fault protection of equipment.
60
The calculation of the service load for an existing installation can be based on actual demand if the maximum demand data is available for what time frame? a) 24 months b) 90 days c) 1 Year d) 6 months
c) 1 year 220.87(1) Maximum demand data is available for a 1 year period. Maximum demand at 125 % plus the new load does not exceed the ampacity of the feeder or rating of the service. Feeder has overcurrent protection in accordance with 240.4 and the service has overload protection in accordance with 230.90
61
If confined space conditions have been identified, which of the following is required before employees may begin work? a) ventilation provided if testing reveals presence of oxygen b) confined space must be blocked off c) written operating procedures must be prepared, and employees must be trained d) lines containing hazardous substances must be purged
c) written operating procedures must be prepared, and employees must be trained CAL/OSHA guide page 23-24
62
What is the minimum overhead clearance required for 120/240 volt service conductors above a residential driveway? a) 15 feet b) 12 feet c) 18 feet d) 10 feet
b) 12 feet 230. 24(B)(2) Requires at least 12 feet for service conductors over residential property and driveways where the voltage does not exceed 300 volts to ground.
63
If the size of a motor overload device, serving a continuous duty motor with a service factor of 1.15 is not sufficient for the starting current of the motor, what percentage of full load current can it be increase to? a) 140% b) 130% c) 150% d) 125%
a) 140% 430. 32(C) Where the sensing element or setting or sizing of the overload device selected is not sufficient to start the motor or to carry the load, higher size sensing elements or incremental settings or sizing shall be permitted to be used, provided the trip current of the overload device does not exceed the following percentage of motor nameplate full load current rating. > Motors with marked service factor 1.15 or greater 140% > Motors with a marked temp rise 40*C or less 140% > All other motors 130%
64
How many receptacles are needed to serve an 11 foot long kitchen countertop installed against a wall? a) 2 b) 5 c) 3 d) 4
c) 3 210. 52(C) requires a receptacle within 2 feet of each end of the countertop. Placing one at 2 foot from each end leaves a 7 foot section of countertop. One more receptacle placed in the center of the 7 foot span ensures that no space along the counter is more than 2 foot from a receptacle.
65
What is the minimum size permitted for a Class 1 circuit conductor? a) 14 AWG b) 20 AWG c) 18 AWG d) 16 AWG
c) 18 AWG 725. 49(A) specifies that conductors of sizes 18 AWG and 16 AWG are permitted to be used for class 1 circuit conductors.
66
How is the amount of incident energy determined? a) by available fault current, duration of fault and distance to the fault. b) by the available fault current c) by the inspector d) by the duration of the fault
a) by the available fault current, duration of the fault and distance to the fault. NFPA 70E D.2.4
67
A motor overload device that can restart a motor automatically after overload tripping shall not be installed if automatic restarting of the motor can result in: a) motor overload b) injury to persons c) locked rotor condition d) damage to equipment
b) injury to persons 430. 43 A motor overload device capable of restarting a motor automatically after overload tripping must not be installed if the automatic restarting of the motor can result in injury to persons.
68
A flush mounted switch used in a wet location shall be equiped with: a) weather resistant cover b) lock off feature c) GFCI protection d) weatherproof cover
d) weatherproof cover | 404. 4(B) A flush mounted switch or circuit breaker shall be equipped with a weather proof cover.
69
A single receptacle installed on an individual branch circuit shall have an ampere rating: a) not less than the branch circuit rating b) not more than 50% of the branch circuit rating c) of at least 125% of the branch circuit rating d) not more than 80% of the branch circuit rating
a) not less than the branch circuit rating 210. 21(B)(1) Except as allowed in exceptions 1 and 2, a single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.
70
The conductors and equipment required or permitted by the NEC shall be acceptable only if: a) Installed b) Approved c) Tested d) Copper
b) Approved | 110. 2 The conductors and equipment required or permitted by this code shall be acceptable only if approved.
71
What is the ampacity of a 3/0 AWG cu Type THW-2 conductor used at 86*F, outside in free air? a) 300 amps b) 260 amps c) 350 amps d) 310 amps
c) 350 amps Table 310.15(B)(17)
72
When calculating the receptacle load of a business 50% can be applied to the portion of the receptacle load in excess of: a) 50,000 VA b) 10,000 VA c) 120,000 VA d) 35,000 VA
b) 10,000 VA Table 220.44 The portion of the receptacle load above 10,000 VA in other than dwelling units can be calculated at 50%.
73
An Inverse time circuit breaker operates on the principle that : a) the opening time increases as the current draw increases b) the opening time decreases as the current draw increases c) the opening time decreases as voltage increases d) the opening time increases as the voltage decreases
b) The opening time decreases as the current draw increases Thermal magnetic circuit breakers open quicker on larger faults. The smaller the fault condition will trigger the thermal portion of the circuit breaker over time while a large short circuit condition will cause the magnetic portion of the device to trigger the blow-open contact assembly very quickly.
74
A non self supporting extension ladder shall be placed so that the horizontal distance from the top support to the foot of the ladder is what distance of the working length of the ladder? a) one-quarter of the working length b) 6 feet c) 5 feet d) one-eighth of the working length
a) one-quarter of the working length CAL/OSHA guide page 90 4:1 ratio with extension ladders
75
Which of the following can be connected to the small appliance circuit in a dwelling unit kitchen? a) garage receptacle b) igniter of a gas stove c) bathroom receptacle d) outdoor receptacle
b) igniter of a gas stove 210. 52(B)(2) exception 2 The kitchen small appliance circuits can also provide power to receptacles for supplemental equipment and lighting on gas fired ranges, ovens, or counter-mounted cooking units.
76
Of the following characteristics, which is not required to be compatible to the output of a generator or other electrical power production source operating in parallel with and electrical supply system? a) Voltage b) Amperage c) Wave shape d) Frequency
b) Amperage
77
What is the minimum bending radius for a power and control tray cable with a metallic shielding? a) 6x's O.D. of cable b) 8x's O.D. of cable c) 10x's O.D. of cable d) 12x's O.D. of cable
d) 12x's O.D. of the cable | 336. 24
78
The working space in front of fire or electrical equipment may be used to store a) nothing b) electrical panesl c) fluorescent lamps d) suitable for installation
a) nothing | 110. 26
79
Surface nonmetallic raceways that have limited smoke producing characteristics shall be a) listed for the purposes b) approved for use c) permitted to be so identified d) suitable for installation
c) permitted to be so identified | 388. 120
80
What is the maximum number of branch circuit conductors permitted in a recongnized wiring method between luminaries connected together on a single phase 120/240 volt system? a) 2 b) 3 c) 4 d) 5
d) 5 conductors | 410. 20
81
In what location are disconnecting means NOT required for individual luminaries with fluorescent double ended lamps and ballasts? a) Dwelling unit b) Hazardous c) Industrial d) Commercial
a) dwelling unit | 410. 30(G)(1)
82
The top of a 12 inch deep wall cabinet, installed in a room with electric space heating cables embedded in the ceiling, shall be below the ceiling no less than a) 3 inches b) 6 inches c) 12 inches d) 18 inches
c) 12 inches | 424. 39
83
Non heating leads from fixed outdoor electric deicing and snow melting embedded resistance heating panels shall be permitted to be protected by a) electrical non-metallic tubing b) non-metallic rigid conduit c) grounding sheath d) cable armor
c) grounding sheath | 426. 22(A)
84
What is the maximum AC control voltage to ground for permanent amusement attractions? a) 30 b) 50 c) 120 d) 150
d) 150 Volts
85
The site isolating device installed at the distribution point for agricultural buildings shall be a) surface mounted b) flush mounted c) pole mounted d) isolated
c) pole mounted | 547. 9(A)(2)
86
Circuit breakers shall be marked with the interrupting rating if other than: a) 5,000 amps b) 10,000 amps c) Type HACR d) Instantaneous trip
a) 5,000 amps 240. 83(C). Every circuit breaker (other than those used for supplemental overcurrent protection) having an interrupting rating other than 5000 amperes shall have its interrupting rating shown on the circuit breaker. Quicksearch: Circuit breakers/ Markings. 240.83.
87
Which of the following represents the proper way to secure and support flexible metal conduit? a) Within 12 inches of the box and at 4.5 foot intervals b) Within 12 inches of the box and at 5 foot intervals c) Every 4.5 foot d) Within 6 inches of the box and at 4 foot intervals
a) within 12 inches of the box and 4.5 foot intervals 348. 30(A). FMC shall be securely fastened in place by an approved means within 300 mm (12 in.) of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed 1.4 m (4.5ft). Quicksearch: Flexible metal conduit/ Securing and supporting. 348.30.
88
When can a range hood be cord and plug connected? a) if the receptacle is GFCI protected b) if the cord length is between 18 in and 36 in c) if the cord length is between 3 ft and 4 ft d) if the receptacle is readily accessible
b) if the cord length is between 18 in. and 36 in. 422. 16(B)(4). Range hoods can be cord-and-plug-connected if all of the following conditions are met: (1) The flexible cord is terminated with a grounding-type attachment plug. (2) The length of the cord is not less than 450 mm (18 in.) and not over 1.2m (4 ft.). (3) Receptacles are located to avoid physical damage to the flexible cord. (4) The receptacle is accessible. (5) The receptacle is supplied by an individual branch circuit. Quicksearch: Hoods, range, cord-and-plug-connected. 422.16(B)(4).
89
Which location does NOT require Arc-fault circuit interrupter protection? a) Branch circuits serving the dining room. b) Branch circuits serving the crawl space. c) Branch circuits serving the bedrooms. d) Branch circuits serving the living rooms.
b) Branch circuits serving the crawl space 210. 12(A). AFCI protection is not required in the garage, outdoors, or in an unfinished basement or crawl space. AFCI protection is required in the family room, dining room, living room, parlor, library, den, bedroom, sunroom, recreation room, closets, hallways or similar rooms or areas. Quicksearch: Arc-fault circuit interrupters. 210.12.
90
Which of the following is permitted in the conduit run between the conduit seal and the point at which the conduit leaves a Class I Zone 0 location? a) Boxes. b) Unions. c) Couplings. d) Listed reducers at the seal.
d) Listed reducers at the seal 505. 16(A)(1). Only listed reducers can be installed at a point between the seal and the point at which the conduit leaves the Zone 0 location. Quicksearch: Hazardous (classified) locations, Class 1, Zone 0, 1, and 2 locations/ Sealing/ Drainage and 505.16.
91
What is the percentage of full load current used to determine the overcurrent device size for an inverse time circuit breaker serving a single phase motor? a) 125%. b) 300%. c) 175%. d) 250%.
Table 430.52. Provides the percentages of motor full load current to be used to determine the maximum size of the overcurrent device. When using an inverse time circuit breaker for a single phase motor, the full load current rating can be multiplied by 250% in order to find the correct size circuit breaker for the application. Quicksearch: Circuit breakers/ Overcurrent protection/ Motors. 430.52. d) 250%
92
How many square feet of surface area is a plate-type grounding electrode required to have exposed to the soil? Select one: a. 1 sq. ft. b. 2 sq. ft. c. 1.5 sq. ft. d. 3 sq. ft.
250.52(A)(7). Each plate electrode must expose no less than 2 ft2 of surface to exterior soil. Quicksearch: Plate electrodes. 250.52(A)(7). The correct answer is: 2 sq. ft.
93
Which of the following is considered special permission? Select one: a. Approval of an inspection by the inspector. b. Written permission given by the inspection authority. c. Permission granted by the inspection authority. d. Written permission given by an electrical engineer.
Article 100 defines “special permission” as the written consent of the authority having jurisdiction. Quicksearch: Permission, special. Article 100. The correct answer is: Written permission given by the inspection authority.
94
Where are 125-volt, single-phase, 15- or 20-ampere receptacles in a park trailer required to be GFCI protected? Select one: a. Where the receptacle is installed in a bedroom. b. Where the receptacle is installed in the dedicated space for a refrigerator. c. Where the receptacle is installed in a hallway. d. Where the receptacle is installed within 6 ft. of a sink.
552.41(C). In park trailers, GFCI protection is required for the following single phase 125 volt 15 and 20 amp receptacles: (1) Where the receptacles are installed to serve kitchen countertop surfaces (2) Within 1.8 m (6 ft) of any lavatory or sink Exception: Receptacles installed for appliances in dedicated spaces, such as for dishwashers, disposals, refrigerators, freezers, and laundry equipment. (3) In the area occupied by a toilet, shower, tub, or any combination thereof (4) On the exterior of the unit Quicksearch: Ground-fault circuit interrupters/ Park trailers. 552.41(C). The correct answer is: Where the receptacle is installed within 6 ft. of a sink.
95
Which of the following is true of equipment that is listed for a Zone 0 location? Select one: a. It can also be used in a Division 1 location. b. It cannot be used in a Zone 1 or Zone 2 location of the same gas or vapor. c. It can only be used in a Zone 0 location. d. It can also be used in a Zone 1 or Zone 2 location of the same gas or vapor.
505.9(B)(1). Equipment that is listed for a Zone 0 location shall be permitted in a Zone 1 or Zone 2 location of the same gas or vapor, provided that it is installed in accordance with the requirements for the marked type of protection. Quicksearch: Hazardous (classified) locations, Class I, Zone 0, 1, and 2 locations/ Equipment construction. 505.9. The correct answer is: It can also be used in a Zone 1 or Zone 2 location of the same gas or vapor.
96
When an underground water pipe is used as a grounding electrode, which of the following conditions applies to the water pipe? Select one: a. It must be at least trade size ¾. b. It must be bonded within 10 feet of where it enters the building. c. It must be in contact with the earth for more than 10 feet. d. It must be in contact with the earth for at least 10 feet.
250.52(A)(1). For an underground metal water piping system to be considered a grounding electrode, it must be in direct contact with the earth for at least ten feet. Quicksearch: Electrodes, grounding/ Metal water piping system. 250.52(A)(1). The correct answer is: It must be in contact with the earth for at least 10 feet.
97
What is the maximum number of circuit breakers permitted in a panelboard? Select one: a. 42 if it is a lighting and appliance panelboard. b. 24. c. As many as it has been designed, rated, and listed to contain. d. 42.
408.54. A panelboard shall be provided with physical means to prevent the installation of more overcurrent devices than that number for which the panelboard was designed, rated, and listed. Quicksearch: Circuit breakers/ Panelboards. 408.54. The correct answer is: As many as it has been designed, rated, and listed to contain.
98
Which of the following is an optional marking for a flexible cord? Select one: a. Number of conductors. b. Type designation. c. Sunlight resistant. d. Size of conductors.
400.6(B). Special characteristics of flexible cords and cables listed in Table 400.4 are permitted to be surface marked on the cord or cable. These are not mandatory markings. These markings include, but are not limited to, markings for limited smoke, sunlight resistance, and so forth. Quicksearch: Cords/ Marking. 400.6. The correct answer is: Sunlight resistant.
99
What are the conditions that would allow a busway to be installed through a wall? Select one: a. It must be listed. b. It must be used only for branch circuits. c. It must be unventilated where passing through the penetration. d. It must be in an unbroken length.
368.10(C)(1). Bussways can only be installed through walls in unbroken lengths. Quicksearch: Busways/ Extension through walls and floors. 368.10(C). The correct answer is: It must be in an unbroken length.
100
If a switch is connected to a lighting load, which of the following is required at the switch location? Select one: a. A dimmer switch. b. A grounded conductor. c. A metal face plate. d. An occupancy sensor.
404.2(C). Grounded conductors are required at each switch location where lighting loads are controlled unless the installation matches one of the conditions listed in 404.2(C)(1)-(7). Quicksearch: Connections/ Switches. 404.2. The correct answer is: A grounded conductor.
101
Which of the following is true of a permanently connected appliance rated 300 VA? Select one: a. The cord length must be between 3 feet and 7 feet. b. The branch-circuit overcurrent device cannot serve as the only disconnecting means. c. The branch-circuit overcurrent device shall be permitted to serve as the disconnecting means if within sight of or lockable. d. The branch circuit overcurrent device must be within 10 ft. of the appliance.
422.31(A). For permanently connected appliances rated at not over 300 volt-amperes or 1∕8 hp, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable in accordance with 110.25. Quicksearch: Appliances/ Disconnecting means. 422-III. The correct answer is: The branch-circuit overcurrent device shall be permitted to serve as the disconnecting means if within sight of or lockable.
102
Receptacles for show windows shall be installed within: Select one: a. 6 inches of the show window. b. 12 feet of the show window. c. 24 inches of the top of a show window. d. 18 inches of the top of a show window.
210.62. At least one receptacle outlet shall be installed within 450 mm (18 in.) of the top of a show window for each 3.7 linear m (12 linear ft) or major fraction thereof of show window area measured horizontally at its maximum width. Quicksearch: Show windows/ Receptacles. 210.62. The correct answer is: 18 inches of the top of a show window.
103
Which of the following is NOT a type of enclosure that could contain devices operating at 12,470 volts installed in a tunnel? Select one: a. One that is dripproof. b. One that is weatherproof. c. One that is dust tight. d. One that is submersible.
110.59. Enclosures for use in tunnels shall be dripproof, weatherproof, or submersible as required by the environmental conditions. Quicksearch: Tunnels/ Installations over 600 volts, nominal. 110-IV. The correct answer is: One that is dust tight.
104
Branch circuits that supply a neon sign tubing installation shall not be rated greater than: Select one: a. 277 volts. b. 120 volts. c. 20 amps. d. 30 amps.
600.5(B)(1). Branch circuits that supply neon tubing installations shall not be rated in excess of 30 amperes. Quicksearch: Signs/ Branch circuits. 600.5. The correct answer is: 30 amps.
105
Where installed in a hoistway, multi-conductor non-power limited fire alarm circuit cables shall be installed: Select one: a. In liquid-tight flexible metal conduit. b. In rigid metal conduit. c. 6 feet above the floor. d. 8 feet above the floor.
760.53(A)(3). Requires cables in a hoistway to be installed in RMC, RNC, IMC, LFNC or EMT. Quicksearch: Fire alarm systems/ Nonpower-limited circuits/ Multiconductor cable. 760.53. The correct answer is: In rigid metal conduit.
106
How can a No. 6 AWG conductor be identified as an equipment grounding conductor? Select one: a. Yellow conductor insulation with a green stripe. b. Black conductor insulation with green tape at the termination point. c. Black conductor insulation but stripped bare where exposed in a box. d. Green conductor insulation with a yellow stripe.
250.119. Has different requirements for proper equipment grounding conductor identification depending on the size of the conductor. For No. 6 AWG and smaller, the conductor cannot be re-identified at the time of installation by tape or other means. If the No. 6 AWG or smaller conductor is insulated, it shall have a continuous outer finish that is either green or green with one or more yellow stripes. If it is size 4 AWG or larger then taping or re-identifying the conductor where it is accessible is permitted. Quicksearch: Equipment grounding conductors/identification. 250.119. The correct answer is: Green conductor insulation with a yellow stripe.
107
What is the maximum height above the kitchen counter that a receptacle can be installed to serve the counter? Select one: a. 20 inches above the counter. b. 48 inches above the counter. c. 24 inches above the counter. d. 12 inches above the counter.
210.52(C)(5). Receptacle outlets shall be located on or above, but not more than 500 mm (20 in.) above, the countertop. Quicksearch: Countertops, outlets. 210.52(C). The correct answer is: 20 inches above the counter.
108
Branch circuit conductors for a continuous duty motor must be sized no less than: Select one: a. 175% of the motor locked rotor amps. b. 125% of the motor nameplate current. c. 125% of the motor full load current. d. 175% of the motor full load current.
430.22. Motors used in a continuous duty application must be supplied by conductors that are rated for at least 125% of the motor full load current. Quicksearch: Motors/ Conductors/ Continuous duty. 430.22. The correct answer is: 125% of the motor full load current.
109
What is the minimum size conductor, THWN cu., for a 10 ft. feeder tap that supplies a 208 volts, single phase, 5 HP continuous duty motor when the feeder overcurrent device is rated 150 amps? Assume the following installations conditions: ambient temperature 30ºC (86ºF), not more than 3 current-carrying conductors in a raceway, and terminals are rated for 75ºC? Select one: a. No. 4 AWG THWN. b. No. 8 AWG THWN. c. No. 10 AWG THWN. d. No. 6 AWG THWN.
430.28. Tap conductors can never be smaller than branch circuit conductors. The minimum ampacity of the branch circuit conductors for the 5 HP motor is 30.8 amps x 125% = 38.5 amps. A No. 8 THWN conductor is required. From Table 310.15(B)(16), a No. 8 THWN conductor can carry 50 amps. To meet condition (1) of 430.28, the ampacity of the tap conductors cannot be smaller than 1/10 the rating of the feeder overcurrent device, in this case 15 amps for the 150 amp overcurrent device. For a 10 ft. feeder tap, select a conductor that will meet condition (1) of 430.28 and not be smaller than the branch circuit conductor. In this case a No. 8 THWN is required. Quicksearch: Motors/ Branch Circuits/ Taps. 430.28. The correct answer is: No. 8 AWG THWN.
110
Which of the following is true of a multiwire branch circuit? Select one: a. Multiwire branch circuits are not permitted for voltages greater than 120 volts. b. The conductors of multiwire branch circuits are not required to be grouped. c. Each conductor can be individually disconnected. d. All conductors must originate from the same panelboard.
210.4. Multiwire branch circuits must originate from the same panelboard. Multiwire branch circuits must be disconnected simultaneously. Multiwire branch circuits can be used for different voltages. The ungrounded and grounded conductors of a multiwire branch circuit must be grouped in the enclosure as required by 210.4(D). Quicksearch: Multiwire branch circuit. 210.4. The correct answer is: All conductors must originate from the same panelboard.
111
Which of the following requires an enclosure to guard against accidental contact? Select one: a. Live electrical parts operating at 48 volts. b. A luminaire housing for a light fixture operating at 24 volts. c. Live electrical parts operating at 55 volts. d. A 3/0 AWG copper grounding electrode conductor.
110.27. Live parts of electrical equipment operating at 50 volts or more must be guarded against accidental contact. Quicksearch: Guarding, guards/ Live parts/ General. 110.27. The correct answer is: Live electrical parts operating at 55 volts.
112
Which of the following circuit breakers used in a solidly grounded WYE electric service requires Ground-Fault Protection? Select one: a. An 800 amp 208 volt circuit breaker used as a service disconnect. b. An 800 amp 480 volt circuit breaker used as a service disconnect. c. A 1,200 amp 480 volt circuit breaker used as a service disconnect. d. A 1,200 amp 208 volt circuit breaker used as a service disconnect.
230.95. Each service disconnect rated 1000 amps or more requires ground-fault protection of equipment. This applies to solidly grounded wye electrical services where the voltage to ground is more than 150 volts and the phase to phase voltage is not more than 600 volts. Quicksearch: Ground-fault protection/ Service disconnecting means. 230.95. The correct answer is: A 1,200 amp 480 volt circuit breaker used as a service disconnect.
113
Where can a Type 3 surge-protective device be installed? Select one: a. After 20 feet of conductor distance from the service disconnect. b. After 10 feet of conductor distance from the service disconnect. c. On the line side of branch-circuit overcurrent protection for the equipment served. d. On the load side of branch-circuit overcurrent protection up to the equipment served.
285.25. Type 3 SPDs (TVSSs) are permitted to be installed on the load side of branch-circuit overcurrent protection up to the equipment served. Quicksearch: Surge-protective devices (SPDs). Article 285. The correct answer is: On the load side of branch-circuit overcurrent protection up to the equipment served.
114
Which of the following is not considered a fitting? Select one: a. Bushing. b. Reducing washer. c. Locknut. d. Bonding jumper.
Article 100 defines a fitting as an accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function. Quicksearch: Fittings/ Definition. Article 100. The correct answer is: Bonding jumper.
115
If a common grounding electrode conductor is used to bond multiple separately derived systems, it shall be: Select one: a. At least 250 Kcmil copper. b. Not larger than 250 Kcmil aluminum. c. Not larger than 3/0 AWG copper. d. At least 3/0 AWG copper.
250.30(A)(6)(a)(1) allows a common grounding electrode conductor (GEC) to bond multiple separately derived systems. This common GEC must be at least a 3/0 AWG cu. conductor or the metal frame of a building that is connected to the grounding electrode system by at least a 3/0 AWG cu. conductor. Quicksearch: Grounding electrode conductors/ Separately derived systems. 250.30. The correct answer is: At least 3/0 AWG copper.
116
How many conductor allowances are required for a junction box that contains four internal cable clamps? Select one: a. 4. b. 3. c. 2. d. 1.
314.16(B)(2). If one or more internal cable clamps are present in the box, a single volume allowance in accordance with Table 314.16(B) shall be made based on the largest conductor present in the box. Quicksearch: Clamp fill, boxes. 314.16(B)(2). The correct answer is: 1.
117
Exposed, bare 24-V, 15-amp secondary conductors used for a low voltage luminaire shall be: Select one: a. Installed lower than 7 ft. b. Enclosed in a raceway. c. Supplied by a class 3 power source. d. Used for indoor installations only.
411.6(C). According to 411.6(C), exposed bare conductors and current carrying parts shall be permitted for indoor installations only. Bare conductors shall not be installed less than 2.1 m (7 ft) above the finished floor, unless specifically listed for a lower installation height. Quicksearch: Bare conductors/ Lighting systems operating at 30 volts or less. 411.6(C). The correct answer is: Used for indoor installations only.
118
What is the MINIMUM number of receptacles required for a kitchen island countertop? Select one: a. 1. b. 4. c. 2. d. 3.
210.52(C)(2). At least one receptacle is required for each island countertop space with a long dimension of 600 mm (24 in.) or greater and a short dimension of 300 mm (12 in.) or greater. Quicksearch: Countertop Outlets. 210.52(C). The correct answer is: 1.
119
Which one of the following is a Photovoltaic Source Circuit? Select one: a. Circuits from a DC combiner box to the PV inverter. b. Circuits from PV modules to the common connection point of the dc system. c. Circuit conductors from the inverter to the backfed point of interconnection. d. Circuit conductors from the inverter to an AC panelboard.
690.2. PV source circuits are the conductors between modules, and from modules to the common connection point(s) of the dc system. Quicksearch: Circuits/ Photovoltaic source. 690.1. The correct answer is: Circuits from PV modules to the common connection point of the dc system.
120
If two separate circuits supply two 277 v snap switches in a double-gang switch box, what is required? Select one: a. A multiwire branch circuit. b. A divider to separate the switches if they are both supplied by different phases. c. A handle tie on the circuit breaker. d. A divider to separate the switches if they are both supplied by the same phase. Feedback
404.8(B). A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed 300 volts, or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices. Quicksearch: Boxes (outlet, device, pull, and junction)/ Snap switches over 300 volts, not ganged. 404.8(B). The correct answer is: A divider to separate the switches if they are both supplied by different phases.
121
How can a No. 6 AWG conductor be identified as an equipment grounding conductor? Select one: a. Black conductor insulation with green tape at the termination point. b. Green conductor insulation with a yellow stripe. c. Yellow conductor insulation with a green stripe. d. Black conductor insulation but stripped bare where exposed in a box.
250.119. Section 250.119 has different requirements for proper equipment grounding conductor identification depending on the size of the conductor. For No. 6 AWG and smaller, the conductor cannot be re-identified at the time of installation by tape or other means. If the No. 6 AWG or smaller conductor is insulated, it shall have a continuous outer finish that is either green or green with one or more yellow stripes. If it is size 4 AWG or larger then taping or re-identifying the conductor where it is accessible is permitted. Quicksearch: Equipment grounding conductors/identification. 250.119. The correct answer is: Green conductor insulation with a yellow stripe.
122
A lampholder must be of the heavy-duty type when connected to a branch circuit that is rated more than: Select one: a. 277 volts. b. 120 volts. c. 20 amps. d. 750 watts.
210.21(A). According to 210.21(A), if connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of the heavy-duty type. A heavy-duty lampholder shall have a rating of not less than 660 watts if of the admedium type, or not less than 700 watts if of any other type. Tag 1: Wiring and Protection. Tag 2: Branch Circuits. Quicksearch: Heavy-duty lampholders/ Branch circuits. 210.21(A). The correct answer is: 20 amps.
123
Unless permitted by article 680, a 24 volt landscape light must be at least what distance from the nearest edge of a swimming pool? Select one: a. 6 feet. b. 5 feet. c. 10 feet. d. 20 feet.
411.5(B). Unless specifically permitted in article 680, a low voltage lighting system operating at 30 volts or less cannot be closer than 10 feet to the edge of a pool, spa, fountain or similar area. Quicksearch: Lighting systems, 30 volts or less/ Location requirements. 411.5. The correct answer is: 10 feet.
124
What is the minimum size copper grounding electrode conductor for two parallel sets of 500 Kcmil aluminum service conductors supplying a service disconnect? Select one: a. 1/0 AWG. b. 2/0 AWG. c. 3/0 AWG. d. 4/0 AWG.
Table 250.66. Two parallel sets of 500 kCMIL aluminum conductors has the combined area of a 1,000 kCMIL conductor. Table 250.66 requires a 2/0 AWG copper grounding electrode conductor for 1,000 kCMIL aluminum service conductors. Quicksearch: Jumpers, bonding/ Main. 250.28. The correct answer is: 2/0 AWG.
125
When is a renewable class H cartridge fuse permitted to be used? Select one: a. For replacement in existing installations where there is no evidence of overfusing or tampering. b. For new installations. c. Never. d. For replacement of type J or K fuses in existing installations.
240.60(D). Class H cartridge fuses of the renewable type shall be permitted to be used only for replacement in existing installations where there is no evidence of overfusing or tampering. Quicksearch: Cartridge fuses. 240–VI. The correct answer is: For replacement in existing installations where there is no evidence of overfusing or tampering.
126
When is an occupancy sensor permitted to control a required lighting outlet for a habitable room? Select one: a. When the room has at least one additional switched receptacle. b. When the room is greater than 70 square feet. c. When the occupancy sensor is located at the normal wall switch location and is equipped with a manual override function. d. When the occupancy sensor is located at the ceiling level.
210.70(A)(1) Exception 2. Exception No. 2: Lighting outlets shall be permitted to be controlled by occupancy sensors that are (1) in addition to wall switches or (2) located at a customary wall switch location and equipped with a manual override that will allow the sensor to function as a wall switch. Quicksearch: Lighting outlets. 210.70. The correct answer is: When the occupancy sensor is located at the normal wall switch location and is equipped with a manual override function.
127
Which of the following is true of temporary wiring used on a job site during construction? Select one: a. Only single-phase circuits are permitted for temporary construction. b. All temporary wiring must be removed immediately upon completion of construction. c. All circuit breakers used in temporary construction must be lockable in the open position. d. All temporary wiring must be GFCI protected.
590.3(D). Temporary wiring is required to be removed immediately upon completion of construction or the purpose for which the wiring was installed. Quicksearch: Temporary Installations/ Time constraints. 590.3. The correct answer is: All temporary wiring must be removed immediately upon completion of construction.
128
If rock bottom is encountered, the minimum burial depth for a horizontal ground rod is: Select one: a. 30 inches. b. 20 inches. c. 8 feet. d. 24 inches.
250.53(G). Section 250.53(G) allows the ground rod to placed horizontal at an angle up to 45 degrees if rock bottom is encountered . In this type of installation, the electrode must be buried in a trench that is at least 30 inches deep. Quicksearch: Rod electrodes. 250.53. The correct answer is: 30 inches.
129
Which of the following is true of a track light installed near a bathtub? Select one: a. It must be at least 3 feet horizontally and 8 feet vertically from the top of the bathtub rim. b. If installed less than 8 feet above the bathtub rim, it must be GFCI protected. c. It is not permitted above a bathtub. d. It must be listed for wet locations.
410.10(D). The area 3 ft. horizontally and 8 ft. vertically from the top of the bathtub rim or shower stall threshold is not permitted to contain cord connected luminaires, chain or cable suspended luminaires, ceiling fans or track lights. Quicksearch: Bathtubs/ Luminaires. 410.10(D). The correct answer is: It must be at least 3 feet horizontally and 8 feet vertically from the top of the bathtub rim.
130
When discharging a capacitor, which of the following is true? Select one: a. The voltage must be reduced to 50 volts within 1 minute after the capacitor is connected to the source of supply. b. The voltage must be reduced to 50 volts within 10 seconds after the capacitor is disconnected from the source of supply. c. Automatic means of switching or connecting the discharge circuit shall not be used. d. Manual means of switching or connecting the discharge circuit shall not be used.
460.6(B). The discharge circuit shall be either permanently connected to the terminals of the capacitor or capacitor bank or provided with automatic means of connecting it to the terminals of the capacitor bank on removal of voltage from the line. Manual means of switching or connecting the discharge circuit shall not be used. Quicksearch: Capacitors/ Means for discharge. 460.6. The correct answer is: Manual means of switching or connecting the discharge circuit shall not be used.
131
If a common grounding electrode conductor is used to bond multiple separately derived systems, it shall be: Select one: a. At least 3/0 AWG copper. b. At least 250 Kcmil copper. c. Not larger than 3/0 AWG copper. d. Not larger than 250 Kcmil aluminum.
250.30(A)(6)(a)(1). Section 250.30(A)(6) allows a common grounding electrode conductor (GEC) to bond multiple separately derived systems. This common GEC must be at least a 3/0 AWG cu. conductor or the metal frame of a building that is connected to the grounding electrode system by at least a 3/0 AWG cu. conductor. Quicksearch: Grounding electrode conductors/ Separately derived systems. 250.30. The correct answer is: At least 3/0 AWG copper.
132
Which of the following is suitable to protect nonheating power supply leads for a heated pipeline? Select one: a. Electrical metallic tubing. b. Any wiring method permitted in chapter 3. c. Listed flexible metal conduit. d. Electrical nonmetallic tubing.
427.18(B). Nonheating power supply leads shall be protected where they emerge from electrically heated pipeline or vessel heating units by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or other raceways identified as suitable for the application. Quicksearch: Fixed electric heating equipment for pipelines and vessels/ Resistance heating elements/ Power supply leads. 427.18. The correct answer is: Electrical metallic tubing.
133
The nameplate rated circuit current for a fuel cell system shall be: Select one: a. The output rating of the fuel cell system. b. 125% of the rated current indicated on the fuel cell nameplate. c. 80% of the continuous output current rating. d. The rated current indicated on the fuel cell nameplate.
692.8(A). According to 692.8(A), the nameplate rated circuit current shall be the rated current indicated on the fuel cell nameplate. Quicksearch: Fuel cell systems/ Circuit sizing. 692.8. The correct answer is: The rated current indicated on the fuel cell nameplate.
134
In a single family dwelling, the primary protector bonding conductor for a communications system shall not exceed: Select one: a. 15 feet in length. b. 20 feet in length. c. 5 feet in length. d. 10 feet in length.
800.100(A)(4). The primary protector bonding conductor or grounding electrode conductor shall be as short as practicable. In one- and two-family dwellings, the primary protector bonding conductor or grounding electrode conductor shall be as short as practicable, not to exceed 6.0 m (20 ft) in length. Quicksearch: Communications circuits/ Bonding. 800.100(A). The correct answer is: 20 feet in length.
135
If a time delay fuse is not capable of starting a motor, it can be increased to no more than: Select one: a. 400% of the motor full load current. b. 225% of the motor nameplate amps. c. 225% of the motor full load current. d. 300% of the motor nameplate amps.
430.52(C)(1) exception 2. If the rating of the OCPD is insufficient to start the motor, exception 2(b) states that the rating of a time-delay (dual-element) fuse can be increased but shall in no case exceed 225 percent of the full-load current. Quicksearch: Motors/ Overcurrent protection/ Branch circuits. 430-IV. The correct answer is: 225% of the motor full load current.
136
For an installation consisting of two 2-wire branch circuits, the service disconnecting means shall have a rating of not less than: Select one: a. 100 amps. b. 60 amps. c. 30 amps. d. 15 amps.
230.79(B). For installations consisting of not more than two, 2-wire branch circuits, the service disconnecting means shall have a rating of not less than 30 amperes. Quicksearch: Service equipment/ Rating. 230.79. The correct answer is: 30 amps.
137
What is the ampacity of a No. 1 AWG cu. THWN conductor used to carry 277 volts at 86°F, outside in free air? Select one: a. 175 A. b. 165 A. c. 220 A. d. 195 A.
Table 310.15(B)(17). See Table 310.15(B)(17) for a type THWN conductor used in free air. The No. 1 AWG cu. conductor is rated for 195 amps and there is no ambient temperature correction factor required. Quicksearch: Conductors/ In free air Tables. 310.15(B)(17). The correct answer is: 195 A.
138
A grounded circuit conductor is one that: Select one: a. Joins the metal enclosure to the grounding electrode. b. Is terminated to a grounding electrode. c. Is intentionally grounded. d. Has continuity with ground.
Article 100 definitions. According to the definition in article 100, a system or circuit conductor that is intentionally grounded is a grounded conductor. Quicksearch: Conductors/ Grounded/ Definition. Article 100. The correct answer is: Is intentionally grounded.
139
What is the minimum size box required for the following installation? Three 12-2 Nonmetallic sheathed cables, one receptacle and one switch? Select one: a. 29.25 in.³. b. 24.75 in.³. c. 18 in.³. d. 21 in.³.
314.16. Three 12-2 cables = 6 insulated conductors. Count one more for all of the equipment grounds combined. Two allowances per switch or receptacle. Total of 11 conductor allowances. 11 X 2.25 in.3 = 24.75 in3. Quicksearch: Boxes/ Conductors, number in box. 314.16. The correct answer is: 24.75 in.³.
140
Where connected to a 30 Amp branch circuit supplying two or more outlets, a receptacle shall not supply a total cord-and-plug connected load in excess of: Select one: a. 24 amps. b. 30 amps. c. 100% of the branch circuit rating. d. 20 amps.
Table 210.21(B)(2). According to Table 210.21(B)(2), the maximum load permitted on a 30 amp branch circuit is 24 amps which is 80% of the 30 amp branch circuit. Quicksearch: Receptacles/ Maximum cord and plug connected load to. Table 210.21(B)(2). The correct answer is: 24 amps.
141
How much current can a 1/0, THWN-2, cu conductor carry when it is connected to 75°C terminals? Select one: a. 125amps. b. 170 amps. c. 150 amps. d. 130 amps.
110.14(C). Since the terminals are only rated for 75°C, the 90°C rating of the THWN-2 conductor from Table 310.15(B)(16) cannot be used. A 1/0 cu. conductor from the 75°C column of the Table is rated for 150 amps. Quicksearch: Connections/ Temperature limitations. 110.14(C). The correct answer is: 150 amps.
142
Which of the following insulation types can be used for a No. 16 AWG Class 1 circuit conductor? Select one: a. PFA. b. SO. c. ZFF. d. FEP.
725.49(B). Section 725.49(B) specifies the permitted conductor insulation types allowed to be used on Class 1 circuit conductors. Conductors in sizes 18 AWG and 16 AWG shall be Type FFH-2, KF-2, KFF-2, PAF, PAFF, PF, PFF, PGF, PGFF, PTF, PTFF, RFH-2, RFHH-2, RFHH-3, SF-2, SFF-2, TF, TFF, TFFN, TFN, ZF, or ZFF. Quicksearch: Remote-control, signaling, and power-limited circuits/ Class 1 circuits/ Conductors. 725.49. The correct answer is: ZFF.
143
How is the load on show window lighting calculated? Select one: a. 200 VA per linear foot. b. 150 VA per 2 foot of lighting. c. 200 VA per 5 linear meter. d. 150 VA per linear foot.
220.43(A). According to 220.43(A), a load of not less than 660 volt-amperes/linear meter or 200 volt amperes/ linear foot shall be included for a show window, measured horizontally along its base. Quicksearch: Show windows/ Feeders. 220.43(A). The correct answer is: 200 VA per linear foot.
144
If conduit entries are not opposite a removable cover, what are the dimensions of a box used for an angle pull where a 2 inch conduit and a 3 inch conduit containing 4 AWG conductors on the same row enter on the left hand side of the box and leave through the bottom of the box? Select one: a. 24 inches x 24 inches. b. 26 inches x 26 inches. c. 30 inches x 30 inches. d. 20 inches x 20 inches.
314.28(A)(2). Where splices or where angle or U pulls are made, the distance between each raceway entry inside the box or conduit body and the opposite wall of the box or conduit body shall not be less than six times the trade size of the largest raceway in a row. This distance shall be increased by the amount of the sum of the diameters of all other raceway entries in the same row on the same wall of the box. [3 inch conduit x 6] + 2 inch conduit = 20 inches x 20 inches. QuickSearch: Pull Boxes/ Sizes/ 4 AWG and Larger Conductors. 314.28(A). The correct answer is: 20 inches x 20 inches.
145
Using Table 220.56, Demand Factors for Kitchen Equipment – Other Than Dwelling Unit(s), what is the feeder demand load for the following 240 Volt single phase appliances found in a restaurant kitchen: 14 kW oven, 5 kW microwave, 8 kW mixer? Select one: a. 175.5 amps. b. 90 amps. c. 101.25 amps. d. 132.34 amps.
Table 220.56 14 kW oven + 5 kW microwave + 8 kW mixer = 27 kW. 27 kW x .90 = 24.3 kW. 24.3 kW / 240 Volts = 101.25 amps. The number of units of equipment in this kitchen is 3. In the right-hand column, the demand factor % is 90. The correct answer is: 101.25 amps.
146
Using Table 402.5, Allowable Ampacity for Fixture Wires, what is the allowable ampacity for a No. 16 AWG fixture wire? Select one: a. 8 amps. b. 12 amps. c. 6 amps. d. 10 amps.
Table 402.5 From Table 402.5, Allowable Ampacity of Fixture Wires, the allowable ampacity for a No. 16 AWG fixture wire is 8 amps. The correct answer is: 8 amps.
147
Using Table 5, Chapter 9, what is the approximate sq in area for a No. 14 AWG THHW conductor? Select one: a. .0181 square inches. b. .0139 square inches. c. .0109 square inches. d. .0206 square inches.
Chapter 9, Table 5 Using Table 5, Chapter 9, the approximate sq in area for a THHW conductor is .0139. The correct answer is: .0139 square inches.
148
What is the minimum size copper service-entrance conductor for a dwelling service rated 200 amps where the service-entrance conductors carry the entire load of the dwelling? Select one: a. 250 Kcmil Aluminum. b. 2/0 AWG copper c. 3/0 AWG copper. d. 4/0 AWG copper.
310.15(B)(7) For services rated 100-400 amps if the service-entrance conductors or a feeder carry the entire load of the dwelling, multiply the service rating and multiply by 83%. 200 amps x 83% = 166 amps. Select a conductor size from Table 310.15(B)(16). 2/0 copper. The correct answer is: 2/0 AWG copper
149
When can circuit breakers be used as switches on fluorescent lighting circuits? Select one: a. When they are listed and marked 120/208. b. When they are listed and marked SWD or HID. Correct c. When they are listed and marked 277/480. d. When the interrupting rating is more than 5000 amps.
240.83 The key word is circuit breakers. The index entry is: Circuit breakers/markings. 240.83. The correct answer is: When they are listed and marked SWD or HID.
150
Using Table 220.42, Lighting Load Demand Factors, apply the demand factors to a hotel which has a calculated lighting load of 200,000 VA. Select one: a. 72,000 VA. b. 90,000 VA. c. 62,000 VA. d. 42,000 VA.
Table 220.42 Type of Occupancy is a Hotel. 1st 20,000 VA at 50% = 10,000 VA. From 20,001 to 100,000 at 40%. 80,000 VA x 40% = 32,000 VA. Remaining 100,000 VA at 30% = 30,000. 10,000 VA + 32,000 VA + 30,000 VA = 72,000 VA. The correct answer is: 72,000 VA.
151
What is the bending radius of a Mineral Insulated Cable, type MI, that has an external diameter of ¾ inches? Select one: a. 2 inches. b. 7 ½ inches. c. 3 ¾ inches. d. 3 ¼ inches.
332.24 The keyword is Mineral Insulated Cable. The Index entry is Mineral Insulated Cable / Bends / 332.24. The correct answer is: 3 ¾ inches.
152
In dwelling units, ground-fault circuit-interrupter protection is NOT required in which of the following locations? Select one: a. Garages. b. Bathrooms. c. Outdoors. d. Bedrooms.
210.8 The keyword is Ground Fault Circuit Interrupter. The index entry is GFCI / permitted uses / 210.8. The correct answer is: Bedrooms.
153
Using Table 220.55, Demand Factors and Loads for Household Electric Ranges, what is the maximum demand for six ranges, each rated 5 kW? Select one: a. 17.7 kW. b. 30 kW. c. 12.9 kW. d. 12 kW.
Table 220.55 6 ranges x 5 kW each = 30 kW. 30 kW x .43 = 12.9 kW The number of appliances is 6. Use Column B, 3.5 kW through 9 ¾ kW rating. The demand factor % in column B is 43. The correct answer is: 12.9 kW.
154
The two methods of controlling hazardous energy used in the Lockout/Tagout procedure are: Select one: a. Simple and complex. b. Level 1 and level 2. c. Lockout and Tagout. d. Energized and de-energized.
Two forms of hazardous electrical energy control shall be permitted: simple lockout/tagout and complex lockout/tagout. The correct answer is: Simple and complex.
155
Which of the following describes an approach limit at a distance from an arc source where a person could receive a second degree burn during an arc flash incident? Select one: a. Restricted boundary. b. Arc flash boundary. c. Limited approach boundary. d. Incident energy.
NFPA 70E article 100 definition of arc flash boundary. Boundary, Arc Flash. When an arc flash hazard exists, an approach limit at a distance from a prospective arc source within which a person could receive a second degree burn if an electrical arc flash were to occur. The correct answer is: Arc flash boundary.
156
A personal fall arrest (PFA) system must be rigged such that an employee cannot fall more than: Select one: a. 2 feet. b. 4 feet. c. 6 feet. d. 3 feet.
P. 58 Cal/OSHA Pocket Guide. A personal fall arrest (PFA) system must be rigged such that an employee can neither free fall more than 6 feet, nor contact any lower level, and, where practicable, the anchor end of the lanyard shall be secured at a level not lower than the employee’s waist. The correct answer is: 6 feet.
157
Which of the following applies to a worker using a portable extension ladder? Select one: a. Workers should not stand and work on the top three rungs of an extension ladder. b. Workers should not stand and work on the top two rungs of an extension ladder. c. Workers should not stand and work from an extension ladder. d. Workers should not work while on an extension ladder.
P. 91 Portable Ladders To safely use portable ladders employees must not stand and work on the top three rungs of a single or extension type ladder. The correct answer is: Workers should not stand and work on the top three rungs of an extension ladder.
158
A personal fall restraint (PFR) system is used to: Select one: a. Ensure that an employee cannot fall more than 6 feet. b. Keep an employee from hitting a lower level or structure. c. Stop an employee during a fall. d. Prevent an employee from falling.
P. 57. Cal/OSHA Pocket Guide. According to the OSHA pocket guide, a personal fall restraint (PFR) system is used to prevent an employee from falling. It consists of anchorages, connectors, and a body belt or harness. It may include lanyards, lifelines, and rope grabs designed for that purpose. The correct answer is: Prevent an employee from falling.
159
If installed properly, which of the following can be used in place of all other fall protection systems? Select one: a. A safety net. b. A lifeline. c. A lanyard. d. A body harness.
CAL/OSHA guide page 59. Safety nets may be used in place of all other fall protection systems if the nets are installed properly. The correct answer is: A safety net.
160
Which of the following describes an approach limit at a distance from an arc source where a person could receive a second degree burn during an arc flash incident? Select one: a. Incident energy. b. Arc flash boundary. c. Limited approach boundary. d. Restricted boundary.
NFPA 70E article 100 definition of arc flash boundary. Boundary, Arc Flash. When an arc flash hazard exists, an approach limit at a distance from a prospective arc source within which a person could receive a second degree burn if an electrical arc flash were to occur. The correct answer is: Arc flash boundary.
161
A personal fall arrest (PFA) system must be rigged such that an employee cannot fall more than: Select one: a. 2 feet. b. 3 feet. c. 4 feet. d. 6 feet.
P. 58 Cal/OSHA Pocket Guide. A personal fall arrest (PFA) system must be rigged such that an employee can neither free fall more than 6 feet, nor contact any lower level, and, where practicable, the anchor end of the lanyard shall be secured at a level not lower than the employee’s waist. The correct answer is: 6 feet.
162
Which of the following applies to a worker using a portable extension ladder? Select one: a. Workers should not stand and work on the top three rungs of an extension ladder. b. Workers should not work while on an extension ladder. c. Workers should not stand and work on the top two rungs of an extension ladder. d. Workers should not stand and work from an extension ladder.
P. 91 Portable Ladders To safely use portable ladders employees must not stand and work on the top three rungs of a single or extension type ladder. The correct answer is: Workers should not stand and work on the top three rungs of an extension ladder.
163
What is the minimum size electrical metallic tubing needed for 21 No. 12 AWG type RHW conductors? Select one: a. 1 ½ inch. b. ¾ inch. c. 1 inch. d. 1 ¼ inch.
Annex C. 1 1/2 inches. Annex C can be used to determine the maximum number of conductors that can be installed in a conduit if all of the conductors are the same size and insulation type. Table C.1 in Annex C is specific to conductors installed in electrical metallic tubing. Quicksearch: Electrical metallic Tubing (Type EMT)/ Maximum number of conductors and fixture wires in. Tables C.1 and C.1(A). The correct answer is: 1 ½ inch.
164
What is the minimum overhead clearance required for 277/480 volt service conductors in a commercial area, not subject to truck traffic? Select one: a. 15 feet. b. 10 feet. c. 18 feet. d. 12 feet.
230.24(B)(2). Section 230.24(B)(2) requires at least 12 feet for service conductors over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground. Quicksearch: Clearances/ Conductors/ Overhead service. 230.24. The correct answer is: 12 feet.
165
What is the minimum ampacity for conductors that serve a branch circuit for a 3-phase, 208 volt, resistance space heating load of 10,000 VA? Select one: a. 60 amps. b. 48 amps. c. 35 amps. d. 34 amps.
424.3(B). 10,000 amps ÷ 360 volts (208 volts x 1.73) = 27.77 amps. 27.77 amps x 125% = 34.72 or 35 amps. Section 424.3(B) states that fixed electric space heating is considered a continuous load for the purpose of sizing branch circuits. Section 210.19(A)(1) requires branch circuits supplying continuous loads to be sized based on 125% of the continuous load. Quicksearch: Branch circuits/ Fixed electric space heating equipment. 424.3. The correct answer is: 35 amps.
166
How many conductor allowances are there for two 14-3 Nonmetallic sheathed cables (NM), two 14-2 NM cable, 2 internal box clamps, and 2 switches? Select one: a. 16. b. 17. c. 28. d. 14.
314.16. Two 14-3 cables and two 14-2 cables = 10 insulated conductors. Count one more for all of the equipment grounds combined. One allowance for internal cable clamps regardless of how many. Two allowances per switch or receptacle. Total of 16 conductor allowances. If trying to determine cubic inch of the above conductors, multiply 2 cubic inches X 14 conductors. Quicksearch: Boxes/ Conductors, number in box. 314.16. The correct answer is: 16.
167
What is the temperature adder for a rooftop raceway mounted 1 in. above the rooftop? Select one: a. 30°F. b. 14°C. c. 33°C. d. 0°F.
310. 15(B)(3)(c). (c) Raceways and Cables Exposed to Sunlight on Rooftops. Where raceways or cables are exposed to direct sunlight on or above rooftops, raceways or cables shall be installed a minimum distance above the roof to the bottom of the raceway or cable of 23 mm (7∕8 in.). Where the distance above the roof to the bottom of the raceway is less than 23 mm (7∕8 in.), a temperature adder of 33°C (60°F) shall be added to the outdoor temperature to determine the applicable ambient temperature for application of the correction factors in Table 310.15(B)(2)(a) or Table 310.15(B)(2)(b). Quicksearch: Roofs, conduits exposed to sunlight on. 310.15(B)(3)(c). The correct answer is: 0°F.
168
How many conductor allowances are there for two 12-3 Nonmetallic sheathed cables (NM), one 12-2 NM cable, 2 internal box clamps, and 2 receptacles? Select one: a. 31.5. b. 10. c. 13. d. 14.
314.16. Two 12-3 cables and one 12-2 cable = 8 insulated conductors. Count one more for all of the equipment grounds combined. One allowance for internal cable clamps regardless of how many. Two allowances per switch or receptacle. Total of 14 conductor allowances. If trying to determine cubic inch of the above conductors, multiply 2.25 X 14 conductors. Quicksearch: Boxes/ Conductors, number in box. 314.16. The correct answer is: 14.
169
What is the total value in VA for the 2 kitchen small appliance circuits and the laundry circuit required at a dwelling? Select one: a. 1,200 VA. b. 4,500 VA. c. 3,000 VA. d. 1,500 VA.
220.52(A), and (B). Each 2-wire kitchen and laundry branch circuit shall be calculated at 1,500 VA. Section 210.11(C)(1) and 210.11(C)(2) requires each dwelling to have two kitchen small appliance branch circuits and one laundry branch circuit. 3 X 1,500 VA = 4,500 VA. Quicksearch: Appliances/ Load calculations. 220.52. The correct answer is: 4,500 VA.
170
What is the corrected ampacity of a No. 4 AWG XHHW-2 copper conductor used in a 114°F ambient temperature location? Select one: a. 85 amps. b. 77.9 amps. c. 80 amps. d. 95 amps.
310.15(B)(2)(a). The .82 correction factor is selected from Table 310.15(B)(2)(a) based on the 90° C column. The 95 amp value can be used from Table 310.15(B)(16) in the 90°C column for the purpose of derating the conductor. 95 amps X .82 = 77.9 amps. Quicksearch: Ambient temperature. Table 310.15(B)(2)(a). The correct answer is: 77.9 amps.
171
When calculating the receptacle load of a commercial occupancy, what percentage can be applied to the portion of the receptacle load over 10,000 VA? Select one: a. 35%. b. 100%. c. 50%. d. 25%.
Table 220.44. See Table 220.44. The portion of the receptacle load above 10,000 VA in other than dwelling units can be calculated at 50%. Quicksearch: Loads/ Feeders, calculations for. Article 220. The correct answer is: 50%.
172
What is the minimum size copper grounding electrode conductor for three parallel sets of 300 kCMIL copper service conductors supplying a service disconnect? Select one: a. 2/0 AWG. b. 3/0 AWG. c. 4/0 AWG. d. 1/0 AWG.
Table 250.66. Three parallel sets of 300 kCMIL copper conductors has the combined area of a 900 kCMIL conductor. Table 250.66 requires a 2/0 AWG copper grounding electrode conductor for 900 kCMIL copper service conductors. Quicksearch: Jumpers, bonding/ Main. 250.28. The correct answer is: 2/0 AWG.
173
What is the maximum rating of a kitchen waste disposer connected to a 20 amp branch circuit that also supplies lighting? Select one: a. 20 A. b. 10 A. c. 15 A. d. 16 A.
210.23(A)(2). Section 210.23(A)(2) covers utilization equipment such as waste disposers and other equipment that is fastened in place, whether cord-and-plug-connected or hard wired. If the circuit supplies additional loads beyond the fastened in place equipment, then the fastened in place utilization equipment cannot exceed 50% of the branch circuit rating. Quicksearch: Branch circuits/ Appliances. 210.23. The correct answer is: 10 A.
174
Which of the following statements about receptacle ratings is true? Select one: a. A 15 ampere branch circuit can supply a 20 ampere receptacle. b. A 50 ampere branch circuit can supply a 40 ampere receptacle. c. A 20 ampere branch circuit can supply a 15 ampere receptacle. d. A 30 ampere branch circuit can supply a 20 ampere receptacle.
Table 210.21(B)(3). According to Table 210.21(B)(3), a 20 amp branch circuit is permitted to supply a 15 amp or 20 amp rated receptacle. Quicksearch: Receptacles/ Ratings for various size circuits. Table 210.21(B)(3). The correct answer is: A 20 ampere branch circuit can supply a 15 ampere receptacle.
175
What is the load in VA per sq. ft. for the general lighting load in a bank? Select one: a. 39 VA/ft2. b. 4 VA/ft2. c. 3.5 VA/ft2. d. 22 VA/ft2.
Table 220.12. See Table 220.12. The lighting load for a bank is calculated at 3.5 VA/ft2. Quicksearch: Occupancy, lighting loads. Table 220.12. The correct answer is: 3.5 VA/ft2.
176
A single set of 4/0 conductors enter a cabinet at a point that is not opposite their terminal. What is the minimum wire bending space required? Select one: a. 10 inches. b. 7 inches. c. 6.5 inches. d. 4 inches.
Table 312.6(A). See Table 312.6(A) which is for wiring that does not enter the enclosure opposite its terminal. Quicksearch: Cabinets, cutout boxes, and meter socket enclosures/ Deflection of conductors. 312.6. The correct answer is: 4 inches.
177
What is the minimum size flexible metal conduit needed for 5 No. 4 AWG type XHHW conductors? Select one: a. ¾ inch. b. 1 ½ inch. c. 1 ¼ inch. d. 1 inch.
Annex C. 1 1/4 inch. Annex C can be used to determine the maximum number of conductors that can be installed in a conduit if all of the conductors are the same size and insulation type. Table C.3 in Annex C is specific to conductors installed in flexible metal conduit. Quicksearch: Flexible metal conduit (Type FMC) Maximum number of conductors and fixture wires in Tables C3 and C3A. The correct answer is: 1 ¼ inch.
178
What is the minimum number of exterior receptacles required for a single story dwelling with no decks, porches or balconies? Select one: a. 1. b. 2. c. 0. d. 3.
210.52(E)(1). For a one family dwelling and each unit of a two-family dwelling that is at grade level, at least one receptacle outlet is required at the front and back of the dwelling. Quicksearch: Dwellings/Receptacle outlets required/ 210.52. The correct answer is: 2.
179
What is the minimum rating for a feeder conductor supplying three 230-V, single phase AC motors with the following full load current ratings? 12 amps, 17 amps, 28 amps. Select one: a. 57 amps. b. 72 amps. c. 64 amps. d. 71.25 amps.
430.24. According to 430.24, when several motors are supplied by the same feeder, the full load current from the largest motor is multiplied by 125% and then the result is added to the sum of the full load current values of the remaining motors. 28 A X 125% + 17 + 12 = 64 A. Quicksearch: Motors/ Several motors. 430.24. The correct answer is: 64 amps.
180
What is the minimum width for the work space required in front of a 277/480 volt panelboard that is 32 inches wide? Select one: a. 42 inches. b. 32 inches. c. 30 inches. d. 36 inches.
110.26(A)(2). The minimum work space width for electrical equipment that is likely to be examined while energized is the width of the equipment or 30 inches, whichever is greater. Quicksearch: Working space/ About electrical equipment. 110.26. The correct answer is: 32 inches.
181
What is the maximum height that the center of the grip handle of a circuit breaker can be located above the floor or working platform? Select one: a. 6 ft. 6 inches. b. 6 ft. c. 6 ft. 10 inches. d. 6 ft. 7 inches.
240.24(A). Overcurrent devices shall be readily accessible and shall be installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in the highest position, is not more than 6 ft. 7 inches above the floor or working platform. Quicksearch: Overcurrent protection/ Location. 240-II. The correct answer is: 6 ft. 7 inches.
182
What is the maximum permitted rating of a cord-and-plug-connected room air conditioner, connected to a 20 amp individual branch circuit? Select one: a. 12 amps. b. 20 amps. c. 10 amps. d. 16 amps.
440.62(B). If no other loads are supplied, the total marked rating of a cord-and-attachment-plug-connected room air conditioner shall not exceed 80 percent of the rating of a branch circuit. Quicksearch: Air conditioners, room/ Branch-circuit requirements. 440.62. The correct answer is: 16 amps.
183
Which portion of the electrical plans will show number of lamps for an emergency light? Select one: a. One line diagram. b. Luminaire schedule. c. Panel schedule. d. Ceiling plan.
The luminaire schedule for a set of plans is usually on the electrical lighting page. Most sets of plans will have at least one page for lighting, one power plan page for receptacles and utilization equipment and a single line/riser diagram. The correct answer is: Luminaire schedule.
184
In a three-phase, 4 wire Delta-connected system where the midpoint of one phase is grounded, the phase conductor with the higher voltage to ground shall be identified by what color? Select one: a. Yellow b. Blue c. Orange d. Red
110.15 High-Leg Marking. Identification/High-Leg/110.15 The correct answer is: Orange
185
Unless listed for higher temperatures, terminal provisions for circuits rated 100 amperes or less are rated for use with conductors rated _____. Select one: a. 75'C b. 110'C c. 90'C d. 60'C
110.14(C)(1) Termination provisions for equipment rated 100 amperes or less or marked for 14 AWG through 1 AWG are rated for use with 60'C conductors unless listed and marked for use with higher temperature rated conductors. The correct answer is: 60'C
186
What is the minimum width of working space in front of a service disconnect that is 42 in. wide? Select one: a. 42 in. b. 50 in. c. 30 in. d. 48 in.
110.26(A)(2) Width of Working space. Working space/about electrical equipment/110.26 The correct answer is: 42 in. Working space shall be width of equipment or 30" whichever is greater.
187
What determines if an entrance to and egress from working space for large equipment is required? Select one: a. If the equipment is rated 1200 amperes and is 3 ft. wide. b. If the equipment is rated 1000 amperes and is under 3 ft. wide. c. If the equipment is rated 1200 amperes and is over 6 ft. wide. d. If the equipment is rated 1000 amperes and is 6 ft. wide.
110.26(C)(2). For equipment rated 1200 amperes or more and over six feet wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance to and egress from the required working space not less than 24 inches wide and 6½ high at each end of the working space. Quicksearch: Working space/About electrical equipment. 110.26. The correct answer is: If the equipment is rated 1200 amperes and is over 6 ft. wide.
188
The minimum depth of working space in front of a 120/240-volt single phase service panelboard is ________. Select one: a. 3 ft. b. 4 ft. c. 3-1/2 ft. d. 2 ft.
110.26(A)(1) Where the voltage to ground does not exceed 150-volts, the minimum depth of working space is 3 ft. Working space/about electrical equipment/110.26 The correct answer is: 3 ft.
189
What is the required dedicated equipment space for switchboards, panelboards and motor control centers? Select one: a. The space equal to the width and depth of the equipment and extending from the floor to a height of 8 feet above the equipment or to the structural ceiling, whichever is lower. b. The space equal to the width and depth of the equipment and extending from the floor to a height of 4 feet above the equipment or to the structural ceiling, whichever is lower. c. The space equal to the width and depth of the equipment and extending from the floor to a height of 6 feet above the equipment or to the structural ceiling, whichever is lower. d. The space equal to the width and depth of the equipment and extending from the floor to a height of 6½ feet above the equipment or to the structural ceiling, whichever is lower.
110.26(E)(1). The space equal to the width and depth of the equipment and extending to a height of 6 feet above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. Quicksearch: Equipment/Installation, general provisions. 110. The correct answer is: The space equal to the width and depth of the equipment and extending from the floor to a height of 6 feet above the equipment or to the structural ceiling, whichever is lower.
190
Which working space condition applies where there are exposed live parts on one side and a brick wall on the other side of the working space for electrical equipment? Select one: a. Condition 4 b. Condition 3 c. Condition 2 d. Condition 1
See Table 110.26(A)(1) Condition 2 applies concrete, brick, and tile walls are considered grounded surfaces. Working space/about electrical equipment/110.26 The correct answer is: Condition 2
191
What enclosure types for indoor use provide protection against temporary submersion? Select one: a. 3 and 4. b. 1 and 2. c. 5 and 6. d. 6 and 6P.
Table 110.28. Enclosures . . . rated not over 600 volts, nominal . . . shall be marked with an enclosure-type number as shown in Table 110.28. Quicksearch: Enclosures/Indoor use, for. Table 110.28. The correct answer is: 6 and 6P.
192
What equipment is required to be marked in the field with the maximum available fault current? Select one: a. Service equipment in other than dwelling units. b. Service equipment in dwelling units. c. Electrical equipment that may require servicing while energized. d. Electrical equipment that may require servicing while energized in other than dwelling units.
110.24. Service equipment in other than dwelling units shall be legibly marked in the field with the maximum available fault current. The field marking(s) shall include the date the fault-current calculation was performed and be of sufficient durability to withstand the environment involved. The calculation shall be documented and made available to those authorized to design, install, inspect, maintain, or operate the system. Quicksearch: Marking 110.21. The correct answer is: Service equipment in other than dwelling units.
193
In noncombustible walls or ceilings, what is the maximum distance the front edge of an outlet box may be set back of the finished surface? Select one: a. Not more than 1/8 inch. b. Not more than 1/4 inch. c. Not more than 1/2 inch. d. Not more than 3/4 inch.
314.20 The key word is “box”. The Index entry is Boxes / Concealed work / 314.20. The correct answer is: Not more than 1/4 inch.
194
Using Table 610.14(A), Ampacities of Insulated Copper Conductors Used With Short-Time Rated Crane and Hoist Motors, what is the allowable ampacity of a THWN No. 8 AWG conductor in a raceway together with a total of 4 simultaneously energized conductors if the conductors are energized for 30 minutes? Select one: a. 63 amps. b. 69 amps. c. 55 amps. d. 60 amps.
Table 610.14(A) Up to four simultaneously energized THWN No. 8 conductors in conduit that are energized for 30 minutes are rated at 60 amps. The correct answer is: 60 amps.
195
Using Table 310.15(B)(3)(a), Adjustment Factors for More Than 3 Current-Carrying Conductors in a Raceway or Cable, what is the adjusted ampacity for four, No. 1 AWG copper THWN current-carrying conductors installed in the same raceway? Select one: a. 104 amps. b. 91 amps. c. 130 amps. d. 150 amps.
Table 310.15(B)(3)(a). 130 amps x 80% = 104 amps. When the number of conductors in a raceway is between 4-6, adjust the ampacity in Table 310.15(B)(16) by 80%. The correct answer is: 104 amps.
196
Using Table 300.5 Minimum Cover Requirements, 0 to 600 Volts, Nominal, Burial in Millimeters (Inches), what is the minimum burial depth for a direct buried UF cable, supplying a GFCI protected, 20 amp, residential branch circuit on residential property? Select one: a. 18 inches. b. 24 inches. c. 12 inches. d. 36 inches.
Table 300.5 Using Table 300.5, select Column 4 for Residential Branch Circuits. Since the location of the circuit does not match any item in the “Location of Wiring Method or Circuit,” select, “All locations not specified below” which is 12 inches. The correct answer is: 12 inches.
197
What is the maximum size conductor that can be installed in cellular metal floor raceways? Select one: a. 2/0 AWG. b. 4/0 AWG. c. 1/0 AWG. d. 3/0 AWG.
374.20 The key words are “Cellular Metal Floor Raceways.” The Index entry is Cellular Metal Floor Raceways / Size of Conductors / 374.20. The correct answer is: 1/0 AWG.
198
What is the minimum size conductor for festoon lighting? Select one: a. No smaller than No. 12 AWG. b. No smaller than No. 16 AWG. c. No smaller than No. 18 AWG. d. No smaller than No. 14 AWG.
225.6(B) The key word is “Festoon lighting”. The Index entry is Festoon Lighting / Conductor Size / 225.6(B). The correct answer is: No smaller than No. 12 AWG.
199
Using Table 314.16(B), Volume Allowance Required Per Conductor, how much free space is required within a box for each No. 12 AWG conductor? Select one: a. 2.25 cu. in. b. 1.50 cu. in. c. 1.75 cu. in. d. 2.00 cu. in.
Table 314.16(B) Select the conductor size in Table 314.16(B). The allowance required is indicated in the same row. For No. 12 AWG conductors the required space is 2.25 inches. The correct answer is: 2.25 cu. in.
200
Using Table 220.44, Demand Factors for Non-Dwelling Receptacle Loads, apply the demand factors for a building with a receptacle load of 25 KVA. Select one: a. 20,000 VA. b. 25,000 VA. c. 15,500 VA. d. 17,500 VA.
Table 220.44 1st 10,000 VA at 100% = 10,000 VA. Remainder over 10,000 VA at 50% = 15,000 VA at 50% = 7,500 VA. 10,000 VA + 7,500 VA = 17,500 VA. The correct answer is: 17,500 VA.
201
What is the minimum size copper grounding electrode conductor for a service that uses copper 1/0 AWG service-entrance conductors? Select one: a. No. 8 AWG. b. No. 6 AWG. c. No. 4 AWG. d. No. 2 AWG.
Table 250.66 For Copper 1/0 conductors the size of copper grounding electrode conductor is No. 6 AWG. Copper conductors are on the far left hand side of the column. Locate the row with the correct size of conductor and move right to find the column for copper grounding electrode conductor. The correct answer is: No. 6 AWG.
202
Using Table 514.3(B)(1), Class I Locations for Motor Fuel Dispensing Facilities, what is the classification of the space within the enclosure of an overhead type dispensing device? Select one: a. Class 1 Zone 0 b. Class 1 Division 2 c. Class 1 Division 1 d. Class 2 Division 1
Table 514.3(B)(1) From Table 514.3(B)(1) the space within the enclosure of an overhead type dispensing device is classified as Class 1 Division 1. The correct answer is: Class 1 Division 1
203
Using Table 430.250, Full Load Current of 3-Phase Motors, what is the full load current of a 208 Volt, 3-phase, 2 horsepower motor? Select one: a. 6.8 amps. b. 7.5 amps. c. 13.6 amps. d. 7.8 amps.
Table 430.250 Table 430.250 provides the value in amperes of 3-phase motors. The row for 2 horsepower motors under the column for 208 Volts is 7.5 amps. The correct answer is: 7.5 amps.
204
The maximum setting for overcurrent protection for a resistance welder rated at 100 amps is: Select one: a. 100 amps. b. 400 amps. c. 200 amps. d. 300 amps.
630-III. 100 amps x 300% = 300 amps Welders, electric/Resistance. 630-III. 630-III refers to Article 630, Part 3. 630.32(A) The correct answer is: 300 amps.
205
Using Table 312.6(B), Wire Bending Space at Terminals, what is the required wire bending space for 1/0 AWG conductors? Select one: a. 4 ¼ inches. b. 5 ½ inches. c. Not specified. d. 3 inches.
Table 312.6(B) Use the far left column on Table 312.6(B). The second column is for compact stranded aluminum alloy conductors. A 1/0 AWG conductor requires 5 ½ inches of wire bending space. Table 312.6(B) is used when the conductor enters or leaves the enclosure on the wall opposite the terminal. The correct answer is: 5 ½ inches.
206
Using Table 430.248, Full Load Current in Amperes, Single-Phase Alternating-Current Motors, what is the amperage of a 115 Volt, ½ horsepower AC motor? Select one: a. 9.8 amps. b. 4.1 amps. c. 7.2 amps. d. 5.6 amps.
Table 430.248 From Table 430.248, a ½ hp, 115 volt, single phase motor is rated at 9.8 amps. The correct answer is: 9.8 amps.
207
Using Table 210.24, Summary of Branch-Circuit Requirements, what is the maximum permissible load of a cord-and-plug connected window air conditioner on a 20 amp circuit? Select one: a. 16 amps. b. 12 amps. c. 14 amps. d. 20 amps.
Table 210.24 20 amps x .80 = 16 amps. From Table 210.24, the “Permissible Load” row, for the 20 amp column, says “See 210.23(A).” 210.23(A). Cord-and-Plug-Connected Equipment Not Fastened in Place. The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch-circuit ampere rating. The correct answer is: 16 amps.
208
What is the branch circuit load for each linear foot of show window lighting? Select one: a. 300 watts. b. 150 watts. c. 200 watts. d. 100 watts.
220.14(G) The key words are “Show Window Lighting”. The Index entry is Show Windows / Branch Circuits / 220.14(G). The correct answer is: 200 watts.
209
Using Table 220.84, Optional Calculations – Demand Factors for Three or More Multifamily Dwelling Units, what is the feeder demand load for 25 apartments with a calculated load of 825,000 VA? Select one: a. 297,000 VA. b. 288,750 VA. c. 280,500 VA. d. 302,050 VA.
Table 220.84 825,000 VA x .35 = 288,750 The left-hand column is Number of Dwelling Units. Select the 24-25 row. The Demand Factor % is 35. The correct answer is: 288,750 VA.
210
What is the maximum distance from mobile home service equipment to the exterior wall of the mobile home? Select one: a. 50 ft. b. 25 ft. c. 10 ft. d. 30 ft.
Key terms Mobile home and service equipment Mobile homes/Service equipment/550.32 The correct answer is: 30 ft.
211
Using Table 110.26(A)(1) Working Space, what is the minimum depth of clear working space in front of a 208 volt, 3-phase panel mounted to a cinder block basement wall? Select one: a. 3 ft. 6 in. b. 4 ft. 6. in. c. 4 ft. d. 3 ft.
Table 110.26(A)(1) Nominal voltage to ground is less than 150 volts. Condition 2 applies: Exposed live parts on one side of the working space and grounded parts on the other side of the working space. Concrete, brick, or tile walls shall be considered as grounded. The correct answer is: 3 ft.
212
Using Table 4, Chapter 9, Dimensions and Percent Area of Conduit and Tubing, what is the permitted square inch area fill from the over 2 wires column for a 2 inch Schedule 80 Rigid PVC conduit? Select one: a. 1.316 in2. b. 1.150 in2. c. 1.459 in2. d. .684 in2.
Chapter 9, Table 4 From Table 4, Chapter 9, locate the table that applies to Article 352 for schedule 80 PVC. For 2 inch PVC Schedule 80 PVC, from the over 2 wires column, the in2 permitted area is 1.150 in2. The correct answer is: 1.150 in2.
213
Wall switches shall be located at least _____ feet, measured horizontally, from the inside walls of an indoor spa or hot tub? Select one: a. 15 ft. b. 10 ft. c. 5 ft. d. 12 ft.
680.43 The key word is hot tub. The index entry is: Spas and Hot Tubs/indoor installations. The correct answer is: 5 ft.
214
A work bench for an assembly technician in a woodworking shop has a 6 ft. strip of fixed multioutlet assembly used for hand tools. What is the calculated load? Select one: a. 540 volt-amps. b. 1080 volt-amps. c. 360 volt-amps. d. 180 volt-amps.
220.14(H). Multioutlet assembly/calculation of load. 180 VA for each 5 ft. of multioutlet strip, if not used simultaneously. If length is 6 ft. then 360 VA required, because the extra ft. is a fraction of 5 ft. The correct answer is: 360 volt-amps.
215
Which of the following statements about the mounting of electric equipment is/are correct? I. Electric equipment shall be firmly secured to the surface on which it is mounted. II. Wooden plugs driven into holes in masonry, concrete, plaster or similar materials shall not be used. Select one: a. I only. b. Neither I nor II. c. Both I and II. d. II only.
110.13 The keyword is “Mounting of equipment”. The Index entry is Equipment Mounting (See Mounting of Equipment) / 110.13. The correct answer is: Both I and II.
216
What is the minimum rating for a feeder conductor supplying three 230-V, single phase AC motors with the following full load current ratings? 12 amps, 17 amps, 28 amps. Select one: a. 64 amps. b. 71.25 amps. c. 72 amps. d. 57 amps.
430.24. According to 430.24, when several motors are supplied by the same feeder, the full load current from the largest motor is multiplied by 125% and then the result is added to the sum of the full load current values of the remaining motors. 28 A X 125% + 17 + 12 = 64 A. Quicksearch: Motors/ Several motors. 430.24. The correct answer is: 64 amps.
217
What is the corrected ampacity of a No. 4 AWG XHHW-2 copper conductor used in a 114°F ambient temperature location? Select one: a. 80 amps. b. 77.9 amps. c. 85 amps. d. 95 amps.
310.15(B)(2)(a). The .82 correction factor is selected from Table 310.15(B)(2)(a) based on the 90° C column. The 95 amp value can be used from Table 310.15(B)(16) in the 90°C column for the purpose of derating the conductor. 95 amps X .82 = 77.9 amps. Quicksearch: Ambient temperature. Table 310.15(B)(2)(a). The correct answer is: 77.9 amps.
218
A single set of 4/0 conductors enter a cabinet at a point that is not opposite their terminal. What is the minimum wire bending space required? Select one: a. 7 inches. b. 6.5 inches. c. 10 inches. d. 4 inches.
Table 312.6(A). See Table 312.6(A) which is for wiring that does not enter the enclosure opposite its terminal. Quicksearch: Cabinets, cutout boxes, and meter socket enclosures/ Deflection of conductors. 312.6. The correct answer is: 4 inches.
219
What is the maximum rating of a kitchen waste disposer connected to a 20 amp branch circuit that also supplies lighting? Select one: a. 20 A. b. 10 A. c. 16 A. d. 15 A.
210.23(A)(2). Section 210.23(A)(2) covers utilization equipment such as waste disposers and other equipment that is fastened in place, whether cord-and-plug-connected or hard wired. If the circuit supplies additional loads beyond the fastened in place equipment, then the fastened in place utilization equipment cannot exceed 50% of the branch circuit rating. Quicksearch: Branch circuits/ Appliances. 210.23. The correct answer is: 10 A.
220
What is the minimum size copper grounding electrode conductor for three parallel sets of 300 kCMIL copper service conductors supplying a service disconnect? Select one: a. 4/0 AWG. b. 3/0 AWG. c. 1/0 AWG. d. 2/0 AWG.
Table 250.66. Three parallel sets of 300 kCMIL copper conductors has the combined area of a 900 kCMIL conductor. Table 250.66 requires a 2/0 AWG copper grounding electrode conductor for 900 kCMIL copper service conductors. Quicksearch: Jumpers, bonding/ Main. 250.28. The correct answer is: 2/0 AWG.
221
What is the minimum ampacity for conductors that serve a branch circuit for a 3-phase, 208 volt, resistance space heating load of 10,000 VA? Select one: a. 60 amps. b. 35 amps. c. 34 amps. d. 48 amps.
424.3(B). 10,000 amps ÷ 360 volts (208 volts x 1.73) = 27.77 amps. 27.77 amps x 125% = 34.72 or 35 amps. Section 424.3(B) states that fixed electric space heating is considered a continuous load for the purpose of sizing branch circuits. Section 210.19(A)(1) requires branch circuits supplying continuous loads to be sized based on 125% of the continuous load. Quicksearch: Branch circuits/ Fixed electric space heating equipment. 424.3. The correct answer is: 35 amps.
222
What is the corrected ampacity of a No. 4 AWG XHHW-2 copper conductor used in a 114°F ambient temperature location? Select one: a. 95 amps. b. 85 amps. c. 80 amps. d. 77.9 amps.
310.15(B)(2)(a). The .82 correction factor is selected from Table 310.15(B)(2)(a) based on the 90° C column. The 95 amp value can be used from Table 310.15(B)(16) in the 90°C column for the purpose of derating the conductor. 95 amps X .82 = 77.9 amps. Quicksearch: Ambient temperature. Table 310.15(B)(2)(a). The correct answer is: 77.9 amps.
223
What size copper grounding electrode conductor is required for a ground rod if the service entrance conductors are 400 Kcmil copper? Select one: a. 8 AWG. b. 4 AWG. c. 1/0 AWG. d. 6 AWG.
250.66(A). The portion of the grounding electrode conductor that is the sole connection to a ground rod is never required to be larger than 6 AWG copper or 4 AWG aluminum. Quicksearch: Rod electrodes. 250.66(A). The correct answer is: 6 AWG.
224
What is the total value in VA for the 2 kitchen small appliance circuits and the laundry circuit required at a dwelling? Select one: a. 3,000 VA. b. 4,500 VA. c. 1,200 VA. d. 1,500 VA.
220.52(A), and (B). Each 2-wire kitchen and laundry branch circuit shall be calculated at 1,500 VA. Section 210.11(C)(1) and 210.11(C)(2) requires each dwelling to have two kitchen small appliance branch circuits and one laundry branch circuit. 3 X 1,500 VA = 4,500 VA. Quicksearch: Appliances/ Load calculations. 220.52. The correct answer is: 4,500 VA.
225
What is the load in VA per sq. ft. for the general lighting load in a bank? Select one: a. 22 VA/ft2. b. 39 VA/ft2. c. 4 VA/ft2. d. 3.5 VA/ft2.
Table 220.12. See Table 220.12. The lighting load for a bank is calculated at 3.5 VA/ft2. Quicksearch: Occupancy, lighting loads. Table 220.12. The correct answer is: 3.5 VA/ft2.
226
What is the minimum required space between any live metal part and the door of a cabinet? Select one: a. 2 inches. b. ¾ inch. c. ½ inch. d. 1 inch.
312.11(A)(2). There shall be an airspace of at least 25.4 mm (1 in.) between any live metal part, including live metal parts of enclosed fuses, and the door. According to the exception, this distance can be reduced to ½ inch if the door is insulated or has a thickness of .093 in. Quicksearch: Cabinets, cutout boxes, and meter socket enclosures/ Construction specifications. 312-II. The correct answer is: 1 inch.
227
A surge arrestor used in a 2,400 volt service must be connected to: Select one: a. Two ungrounded conductors. b. One ungrounded conductor. c. Each ungrounded conductor. d. Both grounded and ungrounded conductors.
280.3. According to 280.3, a surge arrester installed on a circuit, shall be connected to each ungrounded conductor. Quicksearch: Surge arresters. Article 280. The correct answer is: Each ungrounded conductor.
228
When can the calculation of the service load for an existing installation be based on actual demand? Select one: a. If the maximum demand plus the new load does not exceed the ampacity of the feeder or rating of the service. b. If the maximum demand at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service. c. If the maximum demand data is available for the previous 90 days. d. If the maximum demand data is available for the previous 6 months.
220.87. According to 220.87, the feeder or service load for existing installations can be determined under the following conditions: (1) The maximum demand data is available for a 1-year period. (2) The maximum demand at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service. (3) The feeder has overcurrent protection in accordance with 240.4, and the service has overload protection in accordance with 230.90. Quicksearch: Loads/ Feeders, calculations for. Article 220. The correct answer is: If the maximum demand at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service.
229
What is the minimum size box required for the following installation? Three 12-2 Nonmetallic sheathed cables, one receptacle and one switch? Select one: a. 24.75 in.³. b. 29.25 in.³. c. 18 in.³. d. 21 in.³.
314.16. Three 12-2 cables = 6 insulated conductors. Count one more for all of the equipment grounds combined. Two allowances per switch or receptacle. Total of 11 conductor allowances. 11 X 2.25 in.3 = 24.75 in3. Quicksearch: Boxes/ Conductors, number in box. 314.16. The correct answer is: 24.75 in.³.
230
Unless listed for higher temperatures, terminal provisions for circuits rated 100 amperes or less are rated for use with conductors rated _____. Select one: a. 75'C b. 110'C c. 90'C d. 60'C
110.14(C)(1) Termination provisions for equipment rated 100 amperes or less or marked for 14 AWG through 1 AWG are rated for use with 60'C conductors unless listed and marked for use with higher temperature rated conductors. The correct answer is: 60'C
231
What enclosure types for indoor use provide protection against temporary submersion? Select one: a. 3 and 4. b. 1 and 2. c. 5 and 6. d. 6 and 6P.
Table 110.28. Enclosures . . . rated not over 600 volts, nominal . . . shall be marked with an enclosure-type number as shown in Table 110.28. Quicksearch: Enclosures/Indoor use, for. Table 110.28. The correct answer is: 6 and 6P.
232
What determines if an entrance to and egress from working space for large equipment is required? Select one: a. If the equipment is rated 1200 amperes and is 3 ft. wide. b. If the equipment is rated 1000 amperes and is under 3 ft. wide. c. If the equipment is rated 1200 amperes and is over 6 ft. wide. d. If the equipment is rated 1000 amperes and is 6 ft. wide.
110.26(C)(2). For equipment rated 1200 amperes or more and over six feet wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance to and egress from the required working space not less than 24 inches wide and 6½ high at each end of the working space. Quicksearch: Working space/About electrical equipment. 110.26. The correct answer is: If the equipment is rated 1200 amperes and is over 6 ft. wide.
233
What size conductor, THHN cu., is required to supply a 140 amp load when there are 8 current-carrying conductors in conduit? Terminals are 75°C. Select one: a. 250 kcmil b. 300 kcmil c. 4/0 AWG d. 3/0 AWG
Table 310.15(B)(3)(a). The correction factor for 8 current-carrying conductors in conduit is .7. 140 amps ÷ .7 = 200 amps. Select a 3/0, 90°C conductor from Table 310.15(B)(16). A 3/0 THHN conductor is rated for 225 amps and is large enough to carry the load. Explanation: Use the divide-by method to find what size conductor to select when there are more than three current-carrying conductors in conduit. For example, what size conductor, THW cu., is required to supply a 35 amp load when there are 5 current-carrying conductors in conduit? From Table 310.15(B)(3)(a), the correction factor for 5 current-carrying conductors in the same conduit is .8. Divide the load by .8. 35 amps ÷ .8 = 44 amps. Select a conductor from Table 310.15(B)(16) that is equal to or greater than 44 amps. A No. 6 THW cu. is rated for 65 amps and is large enough to carry the load. QuickSearch: Conductors / Ampacities of / 310.15. The correct answer is: 3/0 AWG
234
What is the temperature correction factor (based on 30'C ambient table) for a 75'C rated conductor when the ambient temperature is 105'F? Select one: a. 0.71 b. 0.87 c. 0.93 d. 0.82
Table 310.15(B)(2)(a) Ambient Temperature/Table 310.15(B)(2)(a) The correct answer is: 0.82
235
What is the minimum ampacity of conductors supplying a 115 amp continuous load? Select one: a. 138 amps. b. 144 amps. c. 115 amps. d. 127 amps.
210.19. Table 310.15(B)(16). 115 amps x 1.25 = 144 amps Explanation: A continuous load is a load that operates for 3 hours or more. A continuous load must be calculated at 125% of the connected load (210.19, 215.2, 230.42). For example, the conductors supplying a 40 amp continuous load must be rated for 50 amps (40 x 1.25 = 50 amps). The conductor must be selected from Table 310.15(B)(16) based on the temperature rating of the terminals. If the terminals are rated 75°C then the 75°C column of the Table must be used to select the conductors to supply the continuous load. QuickSearch: Continuous load / applications / 210.19(A). The correct answer is: 144 amps.
236
What is the maximum permitted ampacity for a 3/0, THWN-2 cu. conductor if the ambient temperature is 54°C? Terminals are rated 75°C. Select one: a. 160 amps. b. 171 amps. c. 92 amps. d. 151 amps.
Table 310.15(B)(2)(a). 3/0 THWN-2 cu conductor = 225 amps. Temperature correction factor = .76 225 amps x .76 = 171 amps Explanation: Once the correction factor is found in Table 310.15(B)(2)(a) it is applied it to the ampacity values in Table 310.15(B)(15) based on the type of conductor that is used. Select the appropriate column in Table 310.15(B)(15) based on the type of conductor, not the rating of the terminals. For example, if a conductor is rated for 90°C and is connected to 75°C terminals, apply the temperature correction factors from Table 310.15(B)(2)(a) to the 90°C column in Table 310.15(B)(16). QuickSearch: Correction factors, ambient temperature / Tables 310.15(B)(2). The correct answer is: 171 amps.
237
What is the maximum permitted ampacity and overcurrent protection for a 3/0 XHHW, 75°C, Aluminum conductor installed in conduit with a total of 8 current-carrying conductors? Terminals are 75°C. Select one: a. 132 amps ampacity/150 amps overcurrent protection. b. 109 amps ampacity/110 amps overcurrent protection. c. 93 amps ampacity/100 amps overcurrent protection. d. 155 amps ampacity/175 amps overcurrent protection.
240.6. 3/0 XHHW Aluminum conductor = 155 amps Correction factor for 8 current-carrying conductors = 70% 155 amps x .70 = 109 amps Next standard overcurrent protection device from 240.6 = 110 amps Explanation: The overcurrent protection for a conductor must be based on the actual ampacity of the conductor, after it has been corrected for ambient temperature or more than three conductors in conduit. For example, if the corrected ampacity of a conductor is 60 amps, that is its actual permitted ampacity and it must be protected at 60 amps. QuickSearch: Conductors / Ampacities of / 310.15. The correct answer is: 109 amps ampacity/110 amps overcurrent protection.
238
What is the ampacity of a No. 8, TW, cu. conductor? Select one: a. 35 amps. b. 50 amps. c. 55 amps. d. 40 amps.
Table 310.15(B)(16). The amount of current that a conductor can carry is limited by the size of the conductor and the temperature rating of the insulation of the conductor. Also, the amount of current a conductor can carry is limited by the temperature rating of the terminals that the conductor is connected to. If a conductor is rated for 90°C and the terminal it is connected to is rated for 75°C, the ampacity permitted on the conductor is limited to the 75°C rating from Table 310.15(B)(16). Section 110.14(C) Temperature Limitations. The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the lowest temperature rating of any connected termination, conductor, or device. The weak point of any electrical system is where conductors are spliced or terminated. The temperature rating of the insulation on the conductor, which along with the size of the conductor determines how much current it can carry, cannot be greater than the temperature rating of the terminal. QuickSearch: Conductors / Ampacities of / 310.15. The correct answer is: 40 amps.
239
What is the allowable ampacity of a 250 kcmil Type THWN aluminum conductor? Assume an ambient temperature of 30'C and not more than 3 current-carrying conductors. Select one: a. 205 amperes b. 180 amperes c. 230 amperes d. 255 amperes
Table 310.15(B)(16) Type THWN is a 75'C rated conductor. The correct answer is: 205 amperes
240
What is the maximum feeder demand for two cook tops rated 6.5 kW each and two ovens rated 3.5 kW each? Select one: a. 18.25 kW. b. 15.45 kW. c. 20 kW. d. 10.0 kW.
Table 220.55 Note 3. 6.5 kW + 6.5 kW + 3.5kW + 3.5 kW = 20 kW. Demand factor for 4 appliances = 50%. 20 kW x 50% = 10 kW. Explanation: Note 3 to Table 220.55 is for ranges over 1 ¾ kW through 8 ¾ kW. In lieu of the method provided in Column C, it shall be permissible to add the nameplate ratings of all household cooking appliances rated more than 1 ¾ kW but not more than 8 ¾ and multiply the sum by the demand factors specified in Column A or Column B for the given number of appliances. Where the rating of cooking appliances falls under both Column A and Column B, the demand factors for each column shall be applied to the appliances for that column, and the results added together. The correct answer is: 10.0 kW.
241
What is the feeder demand load for the following appliances? Dishwasher 1.1 kW Trash Compactor 1.0 kW Garbage Disposal .8 kW Water Heater 4.7 kW Select one: a. 7200 VA. b. 7600 VA. c. 5700 VA. d. 6300 VA.
220.53 Appliance Load 1100 VA + 1000 VA + 800 VA + 4700 VA = 7600 VA 7600 VA *75% = 5700 VA Explanation: According to 220.53, It shall be permissible to apply a demand factor of 75% to the nameplate rating load of four or more appliances fastened in place, other than electric ranges, clothes dryers, space-heating equipment, or air-conditioning equipment, that are served by the same feeder or service in a one-family, two-family, or multifamily dwelling. Examples of household appliances which are fastened in place and could qualify to be included in the group of appliances that would be subject to the 75% demand factor are: garbage disposals, trash compactors, dish washers, and water heaters. The correct answer is: 5700 VA.
242
Using the optional calculation, what is the general load for a single family dwelling that is 1800 sq. ft. and has a 10 kW range, 5 kW clothes dryer and 5.5 kW water heater? Select one: a. 30,400 VA. b. 18,160 VA. c. 12,160 VA. d. 8,200 VA.
220.82(B) Dwelling Unit. General Loads. 1800 sq. ft. x 3 VA per sq. ft. 5,400 VA 2 small appliance branch circuits 3,000 VA 1 laundry circuit 1,500 VA Range 10,000 VA Clothes dryer 5,000 VA Water Heater 5,500 VA Total 30,400 VA 1st 10 KVA at 100% 10,000 VA Remainder (30,400 VA – 10,000 VA = 20,400 VA) at 40% 8,160 VA Total general load: 18,160 VA. Explanation: The general load consists of: (1) 3 volt-amperes per sq. ft. for general lighting and general-use receptacles. The floor area does not include open porches, garages, or unused or unfinished spaces not adaptable for future use. (2) 1500 volt-amperes for each 20 ampere small appliance branch circuit and each laundry branch circuit. (3) The nameplate rating of (a) all appliances fastened in place (b) Ranges, wall mounted ovens, counter-mounted cooking units (c) Clothes dryers that are not connected to the laundry branch circuit (d) Water heaters After these loads are added together, the first 10 KVA is taken at 100%. The remainder of the total load (after subtracting the first 10 KVA) is taken at 40%. The heating and cooling load in a dwelling must be calculated separately from the general load. See 220.82(C). In Informative Annex D, Examples D2(a), D2(b), and D2(c) show how to make a single family dwelling calculation. The correct answer is: 18,160 VA.
243
After applying the demand factor allowed by 220.53, what is the calculated load for the following fastened in place appliances? 1350VA dishwasher, 2000VA trash compactor, 1200VA disposal, 5000VA water heater, and a 780VA attic fan. Select one: a. 8,345 VA b. 10,300 VA c. 7,748 VA d. 9,870 VA
``` Dishwasher 1350 VA Compactor 2000 VA Disposal 1200 VA Water Heater 5000 VA Attic Fan 780 VA Total 10,330 VA 10,330VA x 75% = 7,748 VA ``` The correct answer is: 7,748 VA
244
What is the demand on a residential service for a range with a nameplate rating of 10.5 kW? Select one: a. 8kW b. 9.2kW c. 12kW d. 10.5kW
Demand load from Table 220.55 Column C The correct answer is: 8kW
245
What is a typical supply voltage to a single family dwelling? Select one: a. 110/220 b. 115/230 c. 120/240 d. 125/250
220.5(A) When calculating branch-circuit and feeder loads, the following nominal voltages should be used: 120, 120/240, 208Y/120, 240, 347, 480Y/277, 480, 600Y/347, 600 volts. The correct answer is: 120/240
246
How many 15 amp circuits are required to serve the general lighting load in a 3200 sq. ft. house? Select one: a. 4 circuits. b. 6 circuits. c. 2 circuits. d. 8 circuits.
Response: Annex D1(a). 3200 sq. ft. x 3 VA per sq. ft. = 9600 VA 9600 VA/120V = 80 amps 80 amps ÷ 15 amp circuit = 5.3 circuits. A minimum of 6 circuits are required. Explanation: To determine the minimum number of circuits required to serve the lighting load in a dwelling unit, multiply the square footage x 3 VA per square foot and divide by 120 volts. Divide the load in amps by the size of the circuit, 15 amps or 20 amps. The correct answer is: 6 circuits.
247
What is the demand load on a residential service for one 2.5 kW rated cooktop? Select one: a. 2kW b. 2.5kW c. 2.3kW d. 1.25kW
From Column A of Table 220.55 the demand factor is 80 %. 2.5 kW x 80% = 2 kW The correct answer is: 2kW
248
What is the maximum demand for a wall mounted oven rated 3 kW? Select one: a. 2.2 kW. b. 2.4 kW. c. 3 kW. d. 2.0 kW.
Table 220.55, Column A. 3kW x 80% = 2.4 kW Explanation: In Table 220.55 it is important to understand when to apply Column A, Column B, and Colum C. The numbers in the columns A and B are demand factors (per cents) that recognize all the heating elements and the oven of an electric range will not be on at the same time. And in a multi-family dwelling when there can be more than one range on a single feeder, all the ranges will not be on at the same time. Column C is not a demand factor, but a kW rating. For example, from Column C, the maximum demand for a 12 kW range is 8 kW. The correct answer is: 2.4 kW.
249
What is the service load in VA and amps on the phase conductors for this apartment complex? Six apartments, 1375 sq. ft. each, supplied by a 120/240 single phase service with the following loads: 3. 5 KW Heating unit 6. 5 KW A/C 3 KW Cooktop 3.5 KW Oven 5000 VA Water heater 1700 VA Dishwasher 1200 VA Disposer Select one: a. 64,955 VA, 271 amps. b. 29,525 VA, 123 amps. c. 77,946 VA, 325 amps. d. 177150 VA, 738 amps.
220.84 Table 220.84 1375 sq. ft. x 3VA = 4125 VA 2 sm. app. circuits = 3000 VA 1 laundry circuit = 1500 VA A/C = 6500 VA Cooktop = 3000 VA Oven = 3500 VA Water heater = 5000 VA Dishwasher = 1700 VA Disposer = 1200 VA 29,525 VA 29,525 VA x 6 apts. = 177,150 VA 177,150 VA x .44 (Table 220.84) = 77,946 VA 77,946 VA ÷ 240 volts = 324.775 = 325 amps QuickSearch: Tables / Optional calculations, three or more multifamily units/ Table 220.84 The correct answer is: 77,946 VA, 325 amps.
250
For single-phase services, what is the maximum demand for 13 ranges, each rated 12 kW? Select one: a. 28 kW. b. 67 kW. c. 156 kW. d. 100 kW.
Table 220.55 Demand Factors and Loads for Household Electric Ranges, Counter Mounted Cooking Units, and other Household Cooking Appliances over 1 ¾ kW Rating. From Column C of Table 220.55, the maximum demand for 13 ranges is 28 kW. QuickSearch: Ranges / Brach circuits / calculations of load / Table 220.55 The correct answer is: 28 kW.
251
What is the service load in VA and amps on the phase conductors for this apartment building? Three apartments, 875 sq. ft. each, supplied by a 120/208 three-phase service with the following loads: 8 kW Space heat 10 kW Range 5000 VA Water heater 1200 VA Dishwasher 900 VA Disposal 850 VA Compactor Select one: a. 99225 VA, 276 amps. b. 44,651 VA, 124 amps. c. 44,651 VA, 215 amps. d. 99225 VA, 477 amps.
220.84 Table 220.84 875 sq. ft. x 3 = 2,625 VA 2 sm. appl. circuits = 3,000 VA 1 laundry circuit = 1,500 VA heat = 8,000 VA range = 10,000 VA water heater = 5,000 VA dishwasher = 1,200 VA disposer = 900 VA compactor = 850 VA _________ 33,075 VA 33075 VA x 3 apartments = 99,225 VA 99225 x .45 = 44,651.25 VA In a 3-phase circuit Amperage = VA / V x 1.73 (round to 360) 44,651 VA | 360 volts (208 x 1.73) = 124 amps QuickSearch: Tables / Optional calculations, three or more multifamily units/ Table 220.84 The correct answer is: 44,651 VA, 124 amps.
252
For single-phase services, what is the maximum demand for 18 ranges, each rated 16 kW? Select one: a. 33 kW. b. 38.2 kW. c. 28.8 kW. d. 39.6 kW.
Table 220.55 Demand Factors and Load for Household Electric Ranges, Counter Mounted Cooking Units, and other Household Cooking Appliances over 1 ¾ kW Rating. Note 1 of Table 220.55 is for ranges of the same rating over 12 kW. Add 5% to the maximum demand in column C for each kW the ranges are over 12 kW. 16kW = 4 kW more than 12 kW. 4 kW x .05 = .20 = 20%. 33 kW x 20% = 6.6 kW. 33 KW + 6.6 = 39.6 kW. QuickSearch: Ranges / Brach circuits / calculations of load / Table 220.55 The correct answer is: 39.6 kW.
253
What is the service load in VA and amps on the phase conductors for this apartment building? Six apartments, 950 sq. ft. each, supplied by a 120/240 single phase service with the following loads: 9.5 kW Central Heat 4 kW A/C 6 kW Cooktop 4 kW Oven 4500 VA Water heater 1500 VA Dishwasher 1000 VA Disposer Select one: a. 99,364 VA, 414 amps. b. 91,200 VA, 380 amps. c. 203,100 VA, 846 amps. d. 89,364 VA, 372 amps
220.84 Table 220.84 Use section 220.84 and Table 220.84 to figure the load on the service for a group of apartments. Add all loads together at 100% (only the larger of the heating or A/C) for one apartment, multiply by the number of apartments and multiply that number by the demand factors in Table 220.84. 950 sq. ft. x 3 = 2850 VA 2 sm. appl. circuits = 3000 VA 1 laundry circuit = 1500 VA heat = 9500 VA cook top = 6000 VA oven = 4000 VA water heater = 4500 VA dishwasher = 1500 VA disposal = 1000 VA _________________ 33,850 VA 33,850 VA x 6 apartments = 203,100 VA 203,100 VA x .44 = 89,364 VA (From Table 220.84) TOTAL: 89,364 VA | 240 volts = 372.35= 372 amps QuickSearch: Tables / Optional calculations, three or more multifamily units/ Table 220.84 The correct answer is: 89,364 VA, 372 amps.
254
A qualified person is one who has..... a) passed a written trade exam to show competence in electrical repair b) successfully completed a trade apprenticeship c) been certified to teach and mentor electrical apprentices d) electrical installation skills and safety training to avoid hazards
d) electrical installation skills and safety training to avoid hazards NFPA 70E 2018
255
What is the minimum cubic inch capacity for a device box with external cable clamps that has two No. 14 conductors connected to a switch, and two No.12 conductors connected to a receptacle? There are two equipment grounds entering the box, one No. 12 and one No. 14. Select one: a. 21.25 cubic inches b. 19.25 cubic inches c. 15 cubic inches d. 17 cubic inches
314.16(B)(1)&(4)&(5). 2 No. 14 conductors = 4 cubic inches 2 No. 12 conductors = 4.5 cubic inches Switch (double allowance based on No. 14 conductor) = 4 cubic inches Receptacle (double allowance based on No. 12 conductor) = 4.5 cubic inches Equipment ground (single allowance based on No. 12 conductor) 2.25 cubic inches Total: 19.25 cubic inches QuickSearch: Boxes/Fill Calculations 314.16(B). The correct answer is: 19.25 cubic inches
256
What is the minimum length of a pull box for a straight through pull when the raceways are 4 inch EMT and the conductors enclosed are 250 kcmil ? Select one: a. 24 in. b. 32 in. c. 36 in. d. 18 in.
314.28(A)(1) requires the length of a straight through pull box to be at least 8 times the raceway size when the conductors are No. 4 Awg or larger. ( 8 x 4" = 32") Boxes/Junction, pull/Size/Conductors 4 AWG and larger/314.28(A) The correct answer is: 32 in.
257
In dwelling units, where is GFCI protection NOT required? Select one: a. For outlets in a crawl space. b. For outlets in a boathouse. c. For an outlet within 6 feet of a utility room sink. d. For outlets installed in a finished basement.
210.8(A) GFCI protection is not required for outlets installed in a finished basement. 210.8(A). GFCI protection is required for 125-volt, single-phase, 15- and 20-amp receptacles installed in bathrooms, garages and accessory buildings, outdoors, crawl spaces, unfinished basements, kitchens, within 6 ft. of a sink and in boathouses. GFCI protection is also required for outlets rated up to 240 volts installed in boathouses. (5) Unfinished portions or areas of the basement not intended as habitable rooms. QuickSearch: Ground-fault circuit interrupters /Required /210.8 The correct answer is: For outlets installed in a finished basement.
258
In dormitory units, where is AFCI protection NOT required? Select one: a. Bathrooms b. Bedrooms c. Hallways d. Kitchens
210.12(B) All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in dormitory unit bedrooms, living rooms, hallways, closets, bathrooms, and similar rooms shall be protected by any of the means described in 210.12(A)(1) through (6). QuickSearch: Arc-fault circuit interrupters. 210.12. The correct answer is: Kitchens
259
Which of the following locations in a dwelling unit do not require AFCI protection? Select one: a. Bedroom. b. Dining room. c. Garage. d. Living room.
210.12(A) AFCI protection is not required in the garage, outdoors, or in an unfinished basement or crawl space. AFCI protection is required in the family room, dining room, kitchen, living room, parlor, library, den, bedroom, sunroom, recreation room, closets, hallways or similar rooms or areas. QuickSearch: Arc-fault circuit interrupters / Protection / 210.12(A) The correct answer is: Garage.
260
Which of the following show window installations is a Code violation? Select one: a. A 15 ft. show window with one receptacle outlet installed within 12 inches of the show window. b. A 40 ft. show window with 3 receptacle outlets installed within 18 inches of the show window. c. A 32 ft. show window with 3 receptacle outlets installed within 18 inches of the show window. d. A 25 ft. show window with two receptacle outlets spaced evenly and installed 2 ft. from the top of the show window.
210.62 Show window receptacle outlets must be installed within 18 inches of the top of the show window. At least one receptacle outlet shall be installed within 450 mm (18 in.) of the top of a show window for each 3.7 linear m (12 linear ft.) or major fraction thereof of show window area measured horizontally at its maximum width. QuickSearch: Receptacles / Show windows / 210.62 The correct answer is: A 25 ft. show window with two receptacle outlets spaced evenly and installed 2 ft. from the top of the show window.
261
What is the minimum branch circuit size for a 40 gallon fixed storage-type water heater with a nameplate rating of 22.5 amps? Select one: a. 30 amps. b. 40 amps. c. 25 amps. d. 20 amps.
422.13. A fixed storage-type water heater that has a capacity of 120 gal. or less shall be considered a continuous load for the purpose of sizing branch circuits. 22.5 amps x 1.25 = 28 amps. Next standard size is 30 amps. QuickSearch: Water Heaters. 422.13. The correct answer is: 30 amps.
262
If an individual branch circuit supplies a single continuous, non-motor appliance load, with a marked rating of 12 amps, what is the minimum branch circuit rating? Select one: a. 15 amps. b. 12 amps. c. 25 amps. d. 20 amps.
422.10(A). The branch circuit rating for an appliance that is a continuous load, other than a motor-operated appliance, shall not be less than 125 percent of the marked rating. A 12 Amp load x 1.25 = 15 Amps. QuickSearch: Branch Circuits/Appliances. Article 422 Part II The correct answer is: 15 amps.
263
Flexible cords of the types listed in Table 400.4 may be used for all of the following applications except: Select one: a. As a substitute for fixed wiring of a structure. b. Connection of portable or mobile signs. c. Connection of portable or mobile appliance. d. Wiring of lighting fixtures (luminaries).
400.12. Flexible cords are not permitted to be used as a substitute for fixed wiring of a structure. QuickSearch: Cords/Flexible/Uses not Permitted. 400.8 The correct answer is: As a substitute for fixed wiring of a structure.
264
If a luminaire is not marked otherwise, it is intended to be used with a conductor rated for what temperature? Select one: a. 60ºC. b. 90ºC. c. 105ºC. d. 75ºC.
410.74. A luminaire requiring supply wire rated higher than 60ºC (140ºF) shall be marked with the minimum supply wire temperature rating on the luminaire and shipping carton or equivalent. Quicksearch: Luminaire/Rating. 410.74. The correct answer is: 60ºC.
265
Which of the following luminaire types may not be installed in a clothes closet? Select one: a. LED fixtures with completely enclosed lamps. b. Surface-mounted incandescent fixtures. c. Pendant luminaires. d. Recessed florescent fixtures.
410.16(B). Luminaire Types Not Permitted. Incandescent luminaires with open or partially enclosed lamps and pendant luminaires or lampholders shall not be permitted. QuickSearch: Luminaires/Clothes Closets. 410.16(B) The correct answer is: Pendant luminaires.
266
Luminaires weighing more than 6 pounds are permitted to be supported by all of the following except: Select one: a. Raceway fittings. b. Trees. c. Outlet boxes. d. The screw-shell of lampholders.
410.30. A luminaire weighing more than 6 lbs. shall not be supported by the screw shell of a lampholder. QuickSearch: Luminaires/Supports. 410-IV. The correct answer is: The screw-shell of lampholders.
267
In order for a flexible metal conduit to be recognized as an equipment grounding conductor, which of the following statements is true? Select one: a. The circuit conductors in the raceway must be protected by an overcurrent device not smaller than 30 amps. b. The raceway must contain an equipment grounding conductor if less than 6 feet in length. c. The circuit conductors in the raceway must not be longer than 8 feet in length. d. The circuit conductors in the raceway must be protected by an overcurrent device not larger than 20 amps.
250.118(5). The equipment grounding conductor run with or enclosing the circuit conductors shall be one or more or a combination of the following: (5) Listed flexible metal conduit meeting all the following conditions: a. The conduit is terminated in listed fittings. b. The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less. c. The combined length of flexible metal conduit and flexible metallic tubing and liquidtight flexible metal conduit in the same ground-fault current path does not exceed 1.8 m (6 ft). Quicksearch: Equipment grounding conductors/Types recognized. 250.118. The correct answer is: The circuit conductors in the raceway must be protected by an overcurrent device not larger than 20 amps.
268
When installing a separately derived AC system (transformer), where shall the system bonding jumper and the grounding electrode conductor be installed? I. At the transformer. II. At the first disconnect. Select one: a. I only. b. Both I and II. c. Either I or II. d. II only.
250.30(A)(1) and (2) An unspliced system bonding jumper shall comply with 250.28(A) through (D). This connection shall be made at any single point on the separately derived system from the source to the first system disconnecting means or overcurrent device, or it shall be made at the source of a separately derived system that has no disconnecting means or overcurrent devices. The system bonding jumper can be connected at the transformer or at the first disconnect. Quick Search: Grounding / Separately derived AC systems /250.30(A)(1) and (2) The correct answer is: Either I or II.
269
When a second building is supplied by a feeder or branch circuit, which of the following is required? Select one: a. A non-conductive wiring method that does not produce a parallel path to ground between the two buildings. b. A system bonding jumper to be installed inside the first means of disconnect at the second building. c. A grounding electrode or grounding electrode system at the second building. d. A system bonding jumper to be terminated to the grounding electrode at the second building.
250.32(A) Grounding Electrode. Building(s) or structure(s) supplied by feeder(s) or branch circuit(s) shall have a grounding electrode or grounding electrode system installed in accordance with Part III of Article 250. The grounding electrode conductor(s) shall be connected in accordance with 250.32(B) or (C). Where there is no existing grounding electrode, the grounding electrode(s) required in 250.50 shall be installed. Quicksearch: Grounding/Separate buildings 250.32 The correct answer is: A grounding electrode or grounding electrode system at the second building.
270
What is the full-load current for a 75 hp three-phase motor with a rated voltage of 575 volts? Select one: a. 52 amperes b. 77 amperes c. 41 amperes d. 62 amperes
Table 430.250. The values of full-load currents are typical for motors running at speeds usual for bolted motors and motors with normal torque characteristics. Quicksearch: Full-load current motors/Three-phase, Table 430.250. The correct answer is: 77 amperes
271
For an installation to be classified as a supervised industrial installation, what is the minimum load for the premises wiring system? Select one: a. 1000 kVA b. 2000 kVA c. 1500 kVA d. 2500 kVA
240.2. A supervised industrial installation must have a load of at least 2500 kVA used in industrial processes, manufacturing activities, or both. Quicksearch: Industrial installation, supervised/Definition. 240.2. The correct answer is: 2500 kVA
272
What is the maximum voltage rating, measured line-to-neutral, allowed for plug fuses supplied by a system having a grounded neutral point? Select one: a. Not exceeding 150 volts, line-to-neutral. b. Not exceeding 480 volts, line-to-line. c. Not exceeding 277 volts, line-to-neutral. d. Not exceeding 120 volts, line-to-neutral.
240.50(A)(2). Plug fuses are permitted for use in circuits not exceeding 150 volts line-to-neutral if supplied by a system having a grounded neutral point. Quicksearch: Fuses/Plug, Edison-base type. 240-V. The correct answer is: Not exceeding 150 volts, line-to-neutral.
273
Using Table 312.6(B), Wire Bending Space at Terminals, what is the required wire bending space for 1/0 AWG conductors? Select one: a. Not specified. b. 3 inches. c. 4 ¼ inches. d. 5 ½ inches.
Table 312.6(B) Use the far left column on Table 312.6(B). The second column is for compact stranded aluminum alloy conductors. A 1/0 AWG conductor requires 5 ½ inches of wire bending space. Table 312.6(B) is used when the conductor enters or leaves the enclosure on the wall opposite the terminal. The correct answer is: 5 ½ inches.
274
Which of the following statements about the protection of non- metallic sheathed cable from physical damage is/are correct? I. When run across the top of floor joists in an accessible attic, the cable shall be protected by guard strips. II. When passing through a floor, the cable could be enclosed in Schedule 80 PVC rigid nonmetallic conduit extending at least 6 inches above the floor. Select one: a. II only. b. Both I and II. c. Neither I nor II. d. I only.
334.23 The keywords are “Non-Metallic Sheathed Cable”, “Accessible Attics”. The index entry is Non-Metallic Sheathed Cable / Accessible Attics / 334.23. At section 334.23 there is a reference to 320.23. The correct answer is: Both I and II.
275
In noncombustible walls or ceilings, what is the maximum distance the front edge of an outlet box may be set back of the finished surface? Select one: a. Not more than 3/4 inch. b. Not more than 1/2 inch. c. Not more than 1/4 inch. d. Not more than 1/8 inch.
314.20 The key word is “box”. The Index entry is Boxes / Concealed work / 314.20. The correct answer is: Not more than 1/4 inch.
276
Including all the required circuits, what is the total number of 20-ampere branch circuits required for a dwelling unit where 60 amps is required for the general lighting load? Select one: a. 7 b. 8 c. 5 d. 6
210.11. Annex D Example D1(a) Eight branch circuits is the minimum number of branch circuits required for the dwelling unit. 210.11. Three branch circuits are required for the general lighting load (60 amps / 20 amps = 3 branch circuits). In addition, two 20-ampere small appliance branch circuits are required in the kitchen, one 20-ampere branch circuit is required for the laundry area, one 20-ampere branch circuit is required for the bathroom receptacles, and one 20-ampere branch circuit is required for the garage. QuickSearch: Dwellings/ Receptacle Circuits Required/ 210.11 The correct answer is: 8
277
Snow-melting cables are supplied by a 50-ampere branch circuit. Taps originate from those branch circuit conductors to supply individual non-heating leads of deicing cables. What is the minimum permitted size for those tap conductors? Select one: a. The taps must have an ampacity sufficient for the deicing heating cables, and cannot be less than 20A. b. The taps must have an ampacity sufficient for the snow melting cables plus 50A, as well as an ampacity sufficient for the deicing heating cables. c. The taps must have an ampacity of 50A, as well as an ampacity sufficient for the deicing heating cables. d. The taps must have an ampacity sufficient for the snow melting cables, as well as an ampacity sufficient for the deicing heating cables.
210.19(A)(4) Exc. 1. Tap conductors shall have an ampacity sufficient for the load served. In addition, they shall have an ampacity not less than 15 for circuits rated less than 40 amperes and not less than 20 for circuits rated at 40 or 50 amperes and only when these tap conductors supply any of the following loads: ...... (e) Nonheating leads of deicing and snow-melting cables and mats. NOTE: This exception means the taps must be at least equal to the amps of the load they are feeding, and NO MATTER WHAT SIZE THE LOAD BEING FED, the taps can be rated no less than 15A if the circuit they are tapped from is protected by an OCPD under 40A. Or 20A if the circuit they are tapped from is protected by an OCPD of 40A or 50A. Quicksearch: Branch Circuits/Taps from. 210.19(A) The correct answer is: The taps must have an ampacity sufficient for the deicing heating cables, and cannot be less than 20A.
278
Unless listed for higher temperatures, terminal provisions for circuits rated 100 amperes or less are rated for use with conductors rated _____. Select one: a. 110'C b. 90'C c. 75'C d. 60'C
110.14(C)(1) Termination provisions for equipment rated 100 amperes or less or marked for 14 AWG through 1 AWG are rated for use with 60'C conductors unless listed and marked for use with higher temperature rated conductors. The correct answer is: 60'C
279
The minimum depth of working space in front of a 120/240-volt single phase service panelboard is ________. Select one: a. 3 ft. b. 3-1/2 ft. c. 4 ft. d. 2 ft.
110.26(A)(1) Where the voltage to ground does not exceed 150-volts, the minimum depth of working space is 3 ft. Working space/about electrical equipment/110.26 The correct answer is: 3 ft.
280
Which of the following wiring methods is not permitted for use with service-entrance conductors? Select one: a. Type AC cable. b. Auxiliary gutters. c. Electrical nonmetallic tubing (ENT). d. Wireways.
230.43 Service-entrance conductors shall be installed in accordance with the applicable requirements of this code covering the type of wiring method used and shall be limited to methods listed in 230.43. QuickSearch: Service-entrance conductors / Wiring methods 230.43 The correct answer is: Type AC cable.
281
For a one-family dwelling, what is the minimum rating of the service disconnecting means? Select one: a. 50 amperes. b. 15 amperes. c. 30 amperes. d. 100 amperes.
230.79(C) For a one-family dwelling, the service disconnecting means shall have a rating of not less than 100 amperes, 3-wire. QuickSearch: Service Equipment / Rating / 230.79. The correct answer is: 100 amperes.
282
Two cranes, each with identical loads of 170 amps, are supplied from a common conductor system. What is the minimum ampacity of the common conductor system that supplies both cranes? Select one: a. 323 amps. b. 382.5 amps. c. 340 amps. d. 311 amps.
Table 610.14(E). For multiple cranes, hoists, or both, supplied by a common conductor system, calculate the motor minimum ampacity for each crane as defined in 610.14(E), add them together, and multiply the sum by the appropriate demand factor from Table 610.14(E). 170 amps + 170 amps = 340 amps x 95% = 323 amps Quicksearch: Cranes/Conductors 610-II. The correct answer is: 323 amps.
283
The disconnecting means for elevators shall be __________. Select one: a. accessible b. readily accessible to qualified persons c. accessible to qualified personnel d. readily accessible
620.51 (C) The disconnecting means shall be located where it is readily accessible to qualified persons. Elevators / disconnecting means / 620-VI The correct answer is: readily accessible to qualified persons
284
Unless it is protected from physical damage, what is the required clearance from ground for signs or outline lighting system equipment above areas accessible to vehicles? Select one: a. 14 ft. b. 10 ft. c. 15 ft. d. 12 ft.
600.9(A) Response: (A) Vehicles. Sign or outline lighting system equipment shall be at least 4.3 m (14 ft.) above areas accessible to vehicles unless protected from physical damage. QuickSearch: Signs / Location/ 600.9 The correct answer is: 14 ft.
285
How far from the inside walls of a swimming pool is the equipotential bonding plane required to extend? Select one: a. 2 feet. b. 6 feet. c. 4 feet. d. 3 feet.
680.26(B)(2). The perimeter surface shall extend for 3 feet horizontally beyond the inside walls of the pool. Quicksearch: Swimming pools/Bonding. 680/26(B)(2). The correct answer is: 3 feet.
286
A hot tub installed outdoors using a cord-and-plug connection must _________________ . Select one: a. be GFCI protected with a cord no longer than 10 feet. b. be GFCI protected with a cord no longer than 6 ft. c. be GFCI protected with a cord no longer than 3 feet. d. be GFCI protected with a cord no longer than 15 ft.
680.42(A)(2) Cord-and-plug connections with a cord not longer than 15 ft. shall be permitted where protected by a ground-fault circuit interrupter. Swimming Pools/Spas and Hot Tubs/680-IV. The correct answer is: be GFCI protected with a cord no longer than 15 ft.
287
What is the minimum size equipment grounding conductor for a photovoltaic array? Select one: a. No. 10 AWG b. No. 12 AWG c. No. 8 AWG d. No. 14 AWG
690.45 An equipment grounding conductor shall not be smaller than 14 AWG. Quicksearch: Solar photovoltaic systems/Grounding Part V. 690.45. The correct answer is: No. 14 AWG
288
For a group of arc welders with a duty cycle of 100%, how is minimum conductor ampacity determined? Select one: a. The sum of 100% of the two largest welders, plus 90% of the third largest welder, plus 80% of the fourth largest welder, plus 50% of all remaining welders. b. The sum of 100% of the two largest welders, plus 85% of the third largest welder, plus 70% of the fourth largest welder, plus 60% of all remaining welders. c. The sum of 100% of the largest welder, plus 85% of the second largest welder, plus 60% of all remaining welders. d. The sum of 100% of the two largest welders, plus 75% of the third largest welder, plus 65% of the fourth largest welder, plus 60% of all remaining welders.
630.11(B). Minimum conductor ampacity shall be based on the individual currents determined in 630.11(A) as the sum of 100% of the two largest welders, plus 85% of the third largest welder, plus 70% of the fourth largest welder, plus 60% of all remaining welders. Quicksearch: Welders, electric/ Arc. 630-II. The correct answer is: The sum of 100% of the two largest welders, plus 85% of the third largest welder, plus 70% of the fourth largest welder, plus 60% of all remaining welders.
289
If a spray process is unenclosed, how far does the Class I, Division 2 area extend outside of the spray area? Select one: a. 10 ft. b. 15 ft. c. 20 ft. d. 5 ft.
516.5(D)(1) See Figure 516.5(D)(1). Quick Search: Hazardous (classified) locations/Spray application, dipping and coating processes. 516.5 The correct answer is: 20 ft.
290
Which of the following is acceptable as the power supply to a mobile home? I. A listed 50-ampere mobile home power supply cord. II. A permanently installed feeder. Select one: a. II only. b. I or II. c. I only. d. Not I or II.
550.10(A) A listed 50-ampere mobile home power supply cord or a permanently installed feeder. The power supply to the mobile home shall be a feeder assembly consisting of not more than one listed 60-ampere mobile home power-supply cord or a permanently installed feeder. Quicksearch: Mobile homes/ Power Supply/ 550.10(A) The correct answer is: I or II.
291
In a gasoline dispensing station how is underground wiring within the dispensing area in a pit or box classified? Select one: a. Class 1 Division 1. b. Class 1 Division 3. c. Class 1 Division 2. d. Not classified.
Table 514.3(B)(1) Class 1 Division 1. The entire space within any pit or box below grade level, any part of which is within 10 ft. horizontally from any edge of the pump. Quick search: Motor fuel dispensing facilities / Classification of locations / 514.3 The correct answer is: Class 1 Division 1.
292
When run across the top of floor joists in an attic that is not accessible by stairs, Armored Cable (Type AC) cables must be protected by guard strips if the cables are installed within _____ of the attic entrance? Select one: a. 6 ft. b. 7 ft. c. 10 ft. d. 3 ft.
320.23(A). Where this space is not accessible by permanent stairs or ladders, protection shall only be required within 6 ft. of the nearest edge of the scuttle hole or attic entrance. QuickSearch: Armored Cable/Accessible Attics. 320.23. The correct answer is: 6 ft.
293
What is the minimum wire bending space at a terminal for a No. 3 AWG conductor that enters the enclosure through a wall that is not opposite the terminal? Select one: a. 1 ½ inches. b. 2 ½ inches. c. 2 inches. d. 3 inches.
Table 312.6(A). Table 312.6(A) shall apply where the conductor does not enter or leave the enclosure through the wall opposite its terminal. From Table 312.6(A) In the 1 wire per terminal column select the row for conductors size 4-3. The minimum distance required is 2 inches. QuickSearch: Conductors, Deflection of, See Deflection of Conductors/Cabinets and cutout boxes 312.6. The correct answer is: 2 inches.
294
Where structural supports do not readily permit fastening of conduit supports, what is the support distance for exposed unbroken lengths of EMT conduit between outlet boxes, junction boxes, cabinets, conduit bodies or other conduit terminations and the first support? Select one: a. 4 ½ feet. b. 5 feet. c. 10 feet. d. 3 feet.
358.30( A) Exception No. 1. Exception No. 1: Fastening of unbroken lengths shall be permitted to be increased to a distance of 1.5 m (5 ft) where structural members do not readily permit fastening within 900 mm (3 ft). QuickSearch: Electrical Metallic Tubing (Type EMT)/Securing and Supporting. 358.30. The correct answer is: 5 feet.
295
Where NM cable is run at angles across the bottom of floor joists in a crawl space or unfinished basement, what is the minimum size cables that can be secured to the bottom of the joists? Select one: a. Four No. 6 AWG. b. Three No. 6 AWG. c. Three No. 8 AWG. d. Four No. 8 AWG.
334.15(C). Where cable is run at angles with joists in unfinished basements and crawl spaces, it shall be permissible to secure cables no smaller than two 6 AWG or three 8 AWG conductors directly to the lower edges of the joists. QuickSearch: Nonmetallic-Sheathed Cable/Unfinished Basements 334.15(C). The correct answer is: Three No. 8 AWG.
296
For 2 ½ inch rigid polyvinyl chloride conduit, what is the maximum spacing between supports? Select one: a. 4 ft. b. 6 ft. c. 5 ft. d. 7 ft.
352.30 Table 352.30(B). PVC conduit shall be supported as required in Table 352.30. From Table 352.30, in the row for trade size conduit 2 ½-3, read to the right to find the required distance is 6 ft. QuickSearch: Rigid Polyvinyl Chloride Conduit (PVC)/Securing and Supporting. 352.30. The correct answer is: 6 ft.
297
What temperature rating is used to determine the ampacity of No. 6 AWG SE cable with Type THWN conductors installed in thermal insulation? Select one: a. 110°C. b. 60°C. c. 75°C. d. 90°C.
338.10(B)(4)(a). The ampacity of SE cable in sizes larger than No. 10 AWG installed in thermal insulation can be determined by the temperature rating of the conductors in the SE cable. Type THWN conductors are rated 75 degrees C. QuickSearch: Service-Entrance Cable/Uses Permitted. The correct answer is: 75°C.
298
Where is Type NM cable permitted? Select one: a. When used as service-entrance cable. b. For exposed and concealed work in normally dry locations (except as prohibited). c. Exposed in dropped ceilings in commercial locations. d. When used in storage battery rooms.
334.10(A). Type NM cable shall be permitted as follows: (1) For both exposed and concealed work in normally dry locations, except as prohibited in 334.10(3). QuickSearch: Nonmetallic-Sheathed Cable/Uses Permitted. 334.10. The correct answer is: For exposed and concealed work in normally dry locations (except as prohibited).
299
If UF cable is installed in a non-metallic raceway listed for direct burial, what is the minimum cover requirement for a 480 VAC, 30-amp circuit that is buried under the parking lot of a commercial building? Select one: a. 18 inches. b. 6 inches. c. 12 inches if protected by GFCI. d. 24 inches.
340.10 ( Table 300.5). From Table 300.5. Column 3, Nonmetallic Raceways Listed for Direct Burial. Row 5, Under streets, highways, roads, alleys, driveways, and parking lots. QuickSearch: Underground Feeder and Branch Circuit Cable (Type UF)/Uses Permitted 340.10. The correct answer is: 24 inches.
300
A 2 inch conduit, and two 1 in. conduits enter the left side of a box all in the same row. The same trade size conduits leave through the bottom of the box. The conductors in the 2 inch conduits are No. 2 Awg. What is the minimum size for a pull box (angle pull)? Select one: a. 16 in. X 16 in. b. 14 in. X 14 in. c. 18 in. X 18 in. d. 12 in. X 12 in.
314.28(A)(2) requires the distance between the conduit entry and the wall opposite that entry to be no less that 6 times the largest conduit plus the trade size of any other conduits in that row. 6 x 2 in. = 12 in. 12 in. + 1 in. +1 in. = 14 in. Boxes/Junction, pull/Size/Conductors 4 AWG and larger/314.28(A) The correct answer is: 14 in. X 14 in.
301
At a residential location, which of the following statements about boat hoists is true? Select one: a. A boat hoist that is double insulated does not need GFCI protection. b. Boat hoists must have built in GFCI protection. c. Receptacles supplying boat hoists do not need GFCI protection if the receptacle is a single contact device. d. A 240-volt receptacle supplying a boat hoist at a residential location is required to be GFCI protected.
210.8(C) (C) Boat Hoists. GFCI protection shall be provided for outlets not exceeding 240 volts that supply boat hoists installed in dwelling unit locations.” Receptacles for boat hoists must have GFCI protection whether they are rated 120-volts or 240-volts. QuickSearch: Boathouses and boat hoists/ 210.8(A)(8) and 210.8(C) The correct answer is: A 240-volt receptacle supplying a boat hoist at a residential location is required to be GFCI protected.
302
If a branch circuit supplies a single non-motor appliance rated for 12 amps and the overcurrent protection rating for the appliance is not marked, what is the maximum rating of the overcurrent protective device (OCPD)? Select one: a. 10 amps. b. 15 amps. c. 25 amps. d. 20 amps.
422.11(E)(2). If the branch circuit supplies a single non-motor-operated appliance, the rating of the overcurrent protection shall comply with the following: (2) Overcurrent protection shall not exceed 20 amperes if the overcurrent protection rating is not marked and the appliance is rated 13.3 amps or less. QuickSearch: Appliances/Overcurrent Protection. 422.11. The correct answer is: 20 amps.
303
What is the maximum rating for an overcurrent protective device protecting infrared commercial or industrial heating appliances? Select one: a. 50 amps. b. 20 amps. c. 30 amps. d. 40 amps.
422.11(C). Infrared lamp commercial and industrial heating appliances shall have overcurrent protection not exceeding 50 amperes. QuickSearch: Appliances/Overcurrent Protection. 422.10. The correct answer is: 50 amps.
304
Which of the following applications is NOT a permitted use of listed flexible cords? Select one: a. Flexible cord located above a suspended or dropped ceiling. b. Flexible cord used as elevator cables. c. Flexible cord used to wire cranes and hoists. d. Flexible cord used to connect moving parts.
400.12(5). Flexible cord is not permitted to be located above a suspended or dropped ceiling. QuickSearch: Cords/Flexible/Uses not Permitted. 400.8(5). The correct answer is: Flexible cord located above a suspended or dropped ceiling.
305
In a clothes closet, what is the minimum distance between a recessed incandescent luminaire with a completely enclosed light source mounted in the wall or ceiling, and the nearest point of storage space? Select one: a. 12 inches. b. 18 inches. c. 6 inches. d. 24 inches.
410.16(C)(3) Quicksearch: Luminaires/Clothes Closets. 410.16 The correct answer is: 6 inches.
306
Luminaires installed in suspended ceilings: Select one: a. Shall not be attached to the ceiling framing members. b. Shall be attached to building structural support framing members. c. Shall be attached to the ceiling framing members by clips listed and identified for use with the fixture and the ceiling framing members. d. Shall be supported independently of the ceiling grid.
410.36 (B). Luminaires shall be securely fastened to the ceiling framing member by mechanical means such as bolts, screws, or rivets. QuickSearch: Luminaires/ Supports. 410-IV. The correct answer is: Shall be attached to the ceiling framing members by clips listed and identified for use with the fixture and the ceiling framing members.
307
What is the minimum size equipment bonding jumper required if a single jumper is being used to bond 4 parallel raceways containing 250 Kcmil copper conductors fed from the load side of a 1000 amp overcurrent device? Select one: a. 1/0 copper. b. No 2 AWG copper. c. 2/0 copper. d. 3/0 copper.
250.102(D), Table 250.122. Size — Equipment Bonding Jumper on Load Side of an Overcurrent Device. The equipment bonding jumperon the load side of an overcurrent device(s) shall be sized inaccordance with 250.122.A single common continuous equipment bonding jumper shall be permitted to connect two or more raceways or cables if the bonding jumper is sized in accordance with 250.122 for the largest overcurrent device supplying circuits therein. Quicksearch: Jumpers, bonding/Equipment. 250.102. The correct answer is: 2/0 copper.
308
What size grounding electrode conductor is required for a 200 amp service that uses 2/0 copper conductors? Select one: a. No. 6 AWG. b. No. 4 AWG. c. No. 2 AWG. d. 1/0 AWG.
Table 250.66 Table 250.66 is used to size the grounding electrode conductor. Table 250.102(C)(1) is used to size the main bonding jumper and the minimum size of the grounded (neutral conductor). Quick Search: Grounding electrode conductors / sizing / Table 250.66 The correct answer is: No. 4 AWG.
309
What size grounding electrode conductor is required for a service that uses 500 kcmil conductors? Select one: a. No. 2 AWG. b. No. 4 AWG. c. 1/0 AWG. d. 2/0 AWG.
Table 250.66 Table 250.66 is used to size the grounding electrode conductor. Table 250.102(C)(1) is used to size the main bonding jumper and the minimum size of the grounded (neutral conductor). Quick Search: Grounding electrode conductors / sizing / Table 250.66 The correct answer is: 1/0 AWG.
310
What is the maximum locked-rotor current in amperes of a 20 hp polyphase design C motor rated at 460 volts? Select one: a. 145 amperes b. 116 amperes c. 93 amperes d. 81 amperes
Table 430.251(B). The conversion table is for use only with 430.110, 440.12, 440.41, and 455.8(C). Quicksearch: Locked-rotor motor current/Conversion, Table 430.251(B). Table 430.251(B). The correct answer is: 145 amperes
311
Which one of the following is not a standard rating for an inverse time circuit breaker? Select one: a. 35 amperes b. 900 amperes c. 110 amperes d. 45 amperes
240.6 Standard ratings include 35, 45 and 110 amperes. 900 amperes is not a standard rating. Circuit breakers/ratings/240.6 The correct answer is: 900 amperes
312
Three sets of 500 kcmil THWN copper conductors connected in parallel have an allowable ampacity of 1140 amperes. What is the maximum rating for an overcurrent device protecting the conductors? Select one: a. 1600 amperes b. 800 amperes c. 1200 amperes d. 1000 amperes
240.4(C) and 240.6. Where the overcurrent device is rated over 800 amperes, the ampacity of the conductors must be equal to or greater than the rating of the overcurrent device. Conductors/overcurrent protection/240.4 The correct answer is: 1000 amperes
313
What is the maximum distance from mobile home service equipment to the exterior wall of the mobile home? Select one: a. 10 ft. b. 25 ft. c. 30 ft. d. 50 ft.
Key terms Mobile home and service equipment Mobile homes/Service equipment/550.32 The correct answer is: 30 ft.
314
Using Table 515.3, Electrical Area Classification for Bulk Storage Plants, what is the classification of the area within 4 ft. of the open end of a vent that discharges upward? Select one: a. Class 1 Division 2 b. Class 2 Division 1 c. Class 1 Zone 0 d. Class 1 Division 1
Table 515.3. The area between 3 ft. and 5 ft. of open end of vent, extending in all directions for a vent that discharges upwards is Class 1 Division 2. The correct answer is: Class 1 Division 2
315
If a branch circuit rated for 15 amps supplies lighting units and also supplies a built-in, fastened-in-place, appliance or utilization equipment, what is the maximum rating of the appliance? Select one: a. 12 amps. b. 7.5 amps. c. 5 amps. d. 15 amps.
210.23(A)(2). The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plug-connected utilization equipment not fastened in place, or both, are also supplied. 15 Amps x .50 = 7.5 Amps. Quicksearch: Branch Circuits/Permissible loads. 210.23. The correct answer is: 7.5 amps.
316
When are branch circuit conductors required to have an ampacity rating equal to or greater than the circuit’s rating? Select one: a. All branch circuit conductors must have an ampacity rated equal to or greater than the circuit’s rating. b. When the branch circuit conductors supply more than two receptacles serving fixed plug-in equipment. c. When the branch circuit conductors supply two or more receptacles serving portable loads. d. When the branch circuit conductors supply a single receptacle.
210.19(A)(2). Conductors of branch circuits supplying more than one receptacle for cord-and-plug-connected portable loads shall have an ampacity of not less than the rating of the branch circuit. Quicksearch: Branch Circuits/Ratings 210-II. The correct answer is: When the branch circuit conductors supply two or more receptacles serving portable loads.
317
For a nominal voltage to ground of 277 volts, where there are exposed live parts on both sides of the working space, what is the minimum clear distance in front of the equipment? Select one: a. Two feet. b. Six feet. c. Four feet. d. Three feet.
Table 110.26(A)(1). The depth of the working space in the direction of live parts shall not be less than that specified in Table 110.26(A)(1). Quicksearch: Working space/About electrical equipment 110.26. The correct answer is: Four feet.
318
When is ground fault protection of equipment required for solidly grounded wye electric services of more than 150 volts to ground but not exceeding 1000 volts phase-to-phase? Select one: a. When the service disconnect is rated 800 amperes or more. b. When the service disconnect is rated 2000 amperes or more. c. When the service disconnect is rated 1200 amperes or more. d. When the service disconnect is rated 1000 amperes or more.
230.95 Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150 volts ground but not exceeding 600 volts phase-to-phase for each service disconnect rated 1000 amperes or more. QuickSearch: Services / Ground-fault protection / 230.95 The correct answer is: When the service disconnect is rated 1000 amperes or more.
319
What is the minimum vertical clearance for service-drop conductors when installed over residential property and driveways and commercial areas not subject to truck traffic if the voltage exceeds 300 volts to ground? Select one: a. 15 feet. b. 12 feet. c. 10 feet. d. 18 feet.
230.24(B)(3) 15 feet - for those areas listed in the 12-ft. classification where the voltage exceeds 300 volts to ground. QuickSearch: Clearances/Conductors/Overhead service. 230.24 The correct answer is: 15 feet.
320
Two motors on a single traveling crane are on the same feeder. The larger motor is rated at 50 amps. The smaller motor is rated at 25 amps. What is the minimum rating of the feeder? Select one: a. 93.5 amps. b. 87.5 amps. c. 106.25 amps. d. 62.5 amps.
610.14(E)(2) Response: (2) Multiple Motors on Single Crane or Hoist. For multiple motors on a single crane or hoist, the minimum ampacity of the power supply conductors shall be the nameplate full-load ampere rating of the largest motor or group of motors for any single crane motion, plus 50 percent of the nameplate full-load ampere rating of the next largest motor or group of motors, using that column of Table 610.14(A) that applies to the longest time-rated motor. 50 amps + (25 amps x .5) = 62.5 amps QuickSearch: Cranes / Article 610 The correct answer is: 62.5 amps.
321
What is the feeder demand factor for 5 elevators on a single feeder? Select one: a. 82% b. 77% c. 79% d. 75%
620.14. Feeder conductors of less ampacity than required by 620.13 shall be permitted, subject to the requirements of Table 620.14. From the Table, the demand factor for 5 elevators is 82% Quicksearch: Elevators/Conductors. Article 620-II through 620-IV. The correct answer is: 82%
322
An electronic power supply for a neon sign is located in the soffit above the storefront. Which of the following is required in order to service the power supply? Select one: a. A permanent walkway inside the soffit leading up to the equipment at least 10 in. wide. b. A 30 in. wide X 36 in. deep working space in front of the power supply. c. A 3 ft. high X 3 ft. wide X 3 ft. deep working space in front of the power supply. d. A 30 in. X 22 in. access door leading to the soffit where the equipment is located.
600.21(D) A working space at least 900 mm (3 ft) high X 900 mm (3 ft) wide X 900 mm (3 ft) deep shall be provided at each ballast, transformer, electronic power supply, and Class 2 power source or at its enclosure where not installed in a sign. Quicksearch: Signs/Electric/Location. 600.21. The correct answer is: A 3 ft. high X 3 ft. wide X 3 ft. deep working space in front of the power supply.
323
What is the maximum voltage allowed between conductors supplying underwater luminaires in a swimming pool? Select one: a. 50 volts b. 240 volts c. No maximum if GFCI protected d. 150 volts
680.23(A)(4) No underwater luminaire shall be installed for operation on supply circuits over 150 volts between conductors. Swimming Pools / Underwater Luminaires / 680.23 The correct answer is: 150 volts
324
At least one GFCI protected, 125-volt, 15A or 20A, receptacle must be located _________ from the inside wall of a permanently installed pool. Select one: a. more than 20 ft. b. within 5 ft. c. between 6 ft. and 20 ft. d. between 6 ft. and 10 ft.
680.22(A)(1) At least one 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit shall be located between 6 and 20 ft. of the inside wall of the pool. Swimming Pools / Receptacles / location / 680.22(A) The correct answer is: between 6 ft. and 20 ft.
325
What is the minimum size equipment grounding conductor for a PV Output Circuit protected by a 30A circuit breaker? Select one: a. 10 AWG aluminum b. 14 AWG copper c. 10 AWG copper d. 12 AWG copper
690.45. Equipment grounding conductors for PV source and PV output circuits shall be sized in accordance with 250.122. Equipment grounding conductor/solar photovoltaic systems/690.43 through 690.46. The correct answer is: 10 AWG copper
326
What is the maximum rating of an overcurrent device for a resistance welder? Select one: a. 200% of the rated primary current of the welder. b. 100% of the rated primary current of the welder. c. 300% of the rated primary current of the welder. d. 125% of the rated primary current of the welder.
630.32(A). Each welder shall have an overcurrent device rated or set at not more than 300 percent of the rated primary current of the welder. Quicksearch: Welders, electric/ Resistance. 630-III. The correct answer is: 300% of the rated primary current of the welder.
327
An equipment disconnecting means is mounted on a remote wall in an aircraft hanger at a height of 6 ft. The equipment disconnecting means is 10 ft. away from any aircraft fuel tanks. What type of hazardous area is the disconnecting means switch located in? Select one: a. Class I Division 2. b. Not classified. c. Class II Division 1. d. Class I Division 1.
513.3(C) The area within 5 feet horizontally from aircraft power plants or aircraft fuel tanks shall be classified as a Class I, Division 2 location that shall extend upward from the floor to a level of 5 feet above the upper surface of wings and of engine enclosures. The disconnect is located outside of the hazardous area. Quick Search: Aircraft Hangars /Classification of Locations / 513.3(C) The correct answer is: Not classified.
328
What is the feeder demand load for a mobile home park that has 26 units? Each unit has a load of 16,000 volt-amps. Service is 120/240 volts, single phase. Select one: a. 416 amps. b. 1733 amps. c. 3467 amps. d. 867 amps.
16,000 VA x 26 = 416,000/240 = 1,733 x .24 = 416 amps. Quick search: Mobile home parks / feeder and service demand factors / Table 550.31 The correct answer is: 416 amps.
329
Which of the following statements about the emergency electrical disconnects for circuits that enter a gasoline dispenser at a motor fuel dispensing facility (gas station) is true? Select one: a. The emergency disconnect must disconnect power to all dispensing devices, and all associated pumps, power, control, and signaling circuits. b. The emergency disconnect must not interrupt power to associated signaling and control circuits entering the dispenser. c. The emergency disconnect must be located no more than 10 ft. from the fuel dispenser. d. The emergency disconnect must be located at least 100’ from the gasoline pumps.
514.11(A) Fuel dispensing systems shall be provided with one or more clearly identified emergency shutoff devices or electrical disconnects. Emergency shutoff devices or electrical disconnects shall disconnect power to all dispensing devices; to all remote pumps serving the dispensing devices; to all associated power, control, and signal circuits; and to all other electrical equipment in the hazardous (classified) locations surrounding the fuel dispensing devices. The emergency disconnecting means must be located at least 20 ft. but no more than 100 ft. from the fuel dispensers. Quick Search: Motor fuel dispensing facilities / Circuit disconnecting means /514.11 The correct answer is: The emergency disconnect must disconnect power to all dispensing devices, and all associated pumps, power, control, and signaling circuits.
330
What is the ampacity of conductors in Armored Cable (Type AC) cable installed in an attic in thermal insulation? Select one: a. 75 degrees C. b. 110 degrees C. c. 60 degrees C. d. 90 degrees C.
320.80. The ampacity of cable installed in these applications shall not exceed that of a 60°C (140°F) rated conductor. QuickSearch: Armored Cable/ampacity. 320.80. The correct answer is: 60 degrees C.
331
What is the minimum wire bending space at a terminal for a 3/0 AWG conductor when the conductor does enter the enclosure through a wall opposite the terminal and the terminal is a lay-in lug? Select one: a. 7 inches. b. 6 ½ inches. c. 7 ½ inches. d. 6 inches.
Table 312.6(B). Table 312.6(B) shall apply where the conductor does enter or leave the enclosure through the wall opposite its terminal. From Table 312.6(B) find the 1 wire per terminal column for a 3/0 AWG conductor. The small a next to 6 ½ inches refers to Note 2. For lay-in terminals reduce the wire bending space by ½ inch. QuickSearch: Conductors, Deflection of, See Deflection of Conductors/Cabinets and cutout boxes 312.6. The correct answer is: 6 inches.
332
If a 100-foot straight run of rigid nonmetallic PVC conduit is installed outdoors in the winter in an ambient temperature of 40 degrees F, how much will the conduit expand in the summer when the outdoor ambient temperature is 115 degrees F? Select one: a. Less than ¼ inch. b. Slightly more than 3 inches. c. More than 4 inches. d. Less than 2 inches.
Table 352.44. From Table 352.44. Temperature change is 75 degrees. Find Temperature Change = 75 degrees. Expansion is 3.04 inches. QuickSearch: Rigid Polyvinyl Chloride Conduit (PVC)/Supporting and securing Table 352.30. The correct answer is: Slightly more than 3 inches.
333
What temperature rating is used to determine the ampacity of a No. 8 SE cable with THWN conductors installed in an interior location and covered within thermal insulation (according to the 2017 NEC) ? Select one: a. 90°C. b. 110°C. c. 60°C. d. 75°C.
338.10(B)(4)(a). The ampacity of SE cable in sizes larger than No. 10 AWG installed in thermal insulation can be determined by the temperature rating of the conductors in the SE cable. Type THWN conductors are rated 75 degrees C. QuickSearch: Service-Entrance Cable/Uses Permitted. The correct answer is: 75°C.
334
The allowable ampacity of a nonmetallic-sheathed cable shall not exceed that of a _____ rated conductor? Select one: a. 75°C. b. 110°C. c. 60°C. d. 90°C.
334.80. The ampacity of Types NM, NMC, and NMS cable shall be determined in accordance with 310.15. The allowable ampacity shall not exceed that of a 60°C (140°F) rated conductor. QuickSearch: Nonmetallic-Sheathed Cable/Ampacity. The correct answer is: 60°C.
335
Multi-conductor UF cable can be used for all of the following installations and locations except: Select one: a. As service-entrance cable. b. In place of NM cable when installed in accordance with article 334. c. For underground direct burial per table 300.5. d. For wiring in wet, dry or corrosive locations.
340.10 1-7. 340.12(1) Type UF cable shall not be used as service-entrance cable. QuickSearch: Underground Feeder and Branch Circuit Cable (Type UF)/Uses Permitted 340.10/Uses Not Permitted 340.12. The correct answer is: As service-entrance cable.

California Electrical (1 decks)

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