JV Test 1 Flashcards by Faustino Liceaga

A 480/240 volt step down transformer where the primary current is 200 amperes, the approximate secondary current will be ____ amps

a) 100
b) 200
c) 300
d) 400

100 Amps —- Uglys Book pg 61
Ep x Ip = Is / Es
480 x 200 / 240 = 400

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What is the secondary current of a single phase step up transformer if the primary voltage is 120 volts, the secondary voltage is 600 volts and the primary current is 10 amps?

a) 2 amps
b) 5 amps
c) 10 amps
d) 50 amps

2 amps —— Uglys book pg 61
Ep x Ip / Is = Is
120 x 10 / 600 = 2

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Where the outside feeder disconnect means consists of more than one switch or circuit breaker determining the rating of the disconnecting means shall be permitted to be done by ____

a) adding all the circuit brakers and dividing by 2
b) adding the connected load and diving by 1.732
c) combining all the ratings of the switches or circuit breakers
d) calculating the load by taking the first 3000 va at 100%

combining all the ratings of the switches or circuit breakers

NEC 225.39

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The inverter output of a stand alone photovoltaic system shall be permitted to supply 120-volts to a single phase, 3-wire 120/240 volt service where there are no ____ on the system.

a) motor loads
b) transformer loads
c) multiwire branch circuits
d) appliance branch circuits

multiwire branch circuits

NEC 690.10 and 710.15 (C)

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Where a combination of transformer and utilization equipment are supplied by feeders over 600-volts, the conductor ampacity shall not be less than the sum of the nameplated rating of the transformers and the equipment that will be operated simultaneously at ____ percent.

a) 80
b) 100
c) 125
d) 150

125 percent

Art 215.2 (B)(2)

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A 20-amp circuit breaker can be used to protect a maximum electric heating load of ____ amps

a) 10
b) 12
c) 16
d) 20

16 amps

The typical rule of thumb is to use 80% of the circuit breaker rating for continuous loads.

Art 424.3(B), electric heat is considered continuous load

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Where a 15-amp circuit breaker is supplying two or more receptacles, the maximum permitted load on any one receptacle shall be _______

a) 7.5
b) 10
c) 12
d) 15

Art 210.21(B)(2), table 210.21(B)(2)

Maximum permitted load is 80% of overload protection

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If 10 pieces of utilization equipment draw 2 amperes each and are supplied by 120 volts, the total volt amps will be _______

a) 10
b) 20
c) 2,400
d) 200

2400

VA= IxE , 2x10=20 , 20x120=2,400

Total volt amps can be calculated using the formula: Total VA = Number of devices × Amperage per device × Voltage.

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To serve a 15,700 va non-continuous load, how many 120 volt 15-ampere circuits are required? The answer is _______

a) 5
b) 7
c) 9
d) 11

15 amp circuit = 1,800VA
15,700/1,800 = 8.72 or 9 circuits
or
15,700/120 = 130.83
130.83/15 = 8.72 0r 9

Each 15-ampere circuit can support a maximum of 1800 VA (15A × 120V).

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In regards to dwelling units, all of the following areas require arc fault interrupter protection except _______

a) parlor, library, and den
b) attic, bathroom, and garage
c) sunroom, closet and hallway
d) media room, dining room and living room

Attic, bathroom and garage

Art 220.12(A

Certain areas are exempt from arc fault protection as per code regulations.

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Which of the following occupancies require arc fault circuit interrupter protection? _______

a) recreational vehicles
b) detached dwelling unit garages
c) a boat house
d) at a hotel or guest room with permanent cooking facilites

d) at a hotel or guest room with permanent cooking facilites

Art 210.17 , 210.12(A)

Arc fault circuit interrupters are required in various types of occupancies for safety.

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Ground fault interrupter protection is required for dwelling unit receptacles in all of the following locations except _______

a) outdoors
b) bathrooms
c) detached garages
d) finished basements

finished basements

Art 210.8(A)

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Where must cables installed in concrete or poured masonry for electrical heater floors in bathrooms and hydromassage tub locations be?

a) GFCi protected
b) AFCI protected
c) supplied by a minimum 20-amp circuit breaker
d) have a minimum of 2-inches of concrete or masonry cover

GFCI protected

Art 424.44(E)

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What is the maximum ampere rating permitted for the overcurrent protective device protecting an 18 AWG conductor for a class 1 circuit?

a) 5
b) 7
c) 10
d) 15

7 amperes

Art 725.43

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When cartridge fuses are accessible to other than qualified personnel, what does the code state about disconnects?

a) any voltage
b) over 110 volts
c) over 150 volts
d) over 240 volts

A disconnect shall be provided on the supply side of the fuses when the voltage to ground is over 150 volts

Art 240.40

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Edison base fuses are permitted only for which type of work?

a) new work
b) replacement
c) motor circuits
d) lighting circuits

Replacement

Art 240.51(B)

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What is the minimum size equipment grounding conductor required for a rooftop air conditioning unit fed with a #6 AWG copper conductor terminated on a 70-amp circuit breaker?

a) 14
b) 6
c) 10
d) 8

8 AWG copper

Table 250.122

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How is the equipment grounding conductor required to be identified?

a) blue insulation
b) white insulation
c) gray or white insulation
d) bare or green insulation

Bare or green insulation

Art 250.119

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What is the minimum required size of THW conductors for a three-phase 208 volt 40 KW load given the presence of harmonic currents?

a) 1/0 b) 3/0 c) 2/0 d) #1

2/0

40,000/208/1.732 = 111 amps
111 amps / .80 / .88 = 157.68 or 158
2/0 cu conductor with an ampacity of 175 amps should be used

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At what intervals shall flexible metal conduit be supported by an approved means?

a) 1
b) 3
c) 4-1/2
d) 6

4 1/2 Art - 348.30(A)

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The interior of a raceway installed underground is considered a _______ location.

a) dry
b) wet
c) damp
d) classified

wet

Art 300.5(B)

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A cable tray is prohibited to be installed in which of the following locations?

a) plenums
b) storage rooms
c) basements
d) passing through a wall

plenums Art 300.22(C)(1)&(2)

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Optical fiber cables shall be permitted in the same raceway with conductors of _______.

a) communication circuits in accordance with article 800
b) sensitive electronic equipment
c) class 1 remote control circuits installed in accordance with article 725
d) non power limited fire alarm system cabling in accordance with article 760

communication circuits in accordance with article 800

Art 770.133(B)(3)

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Given the cross-sectional area of 10 copper conductors is 836 square inches, what is the minimum size RMC required?

a) 1
b) 1-1/4
c) 1-1/2
d) 2

1-1/4

Chapter 9 Table 4 RMC
60% fill 24 or less
1-1/4 with a .916 square inches as 60% should be used

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The maximum spacing permitted between supports for a 1-1/4 rigid conduit is ______ ft. a) 12 b) 14 c) 16 d) 20

14 —— Table 344.30(B)(2)

What is the maximum number of quarter bends permitted between junction boxes used for pull points in sections of EMT without fittings? a) 4 b) 5 c) 6 d) 7

4 —— Art - 358.26

The minimum size for electrical metallic tubing shall be ______ inches. a) 3/8 b) 1/2 c) 3/4 d) 1

1/2 —- Art - 358.20(A)

The maximum number of 8 awg THW conductors permitted in 3/4 inch liquidtight flexible metal conduit is ______. a) 3 b) 4 c) 5 d) 6

5 —— Annex C

Disregarding exceptions, the minimum size of single conductor cable permitted in a cable tray is ______ awg/kcmil. a) 3/0 b) 250 c) 500 d) 1/0

1/0 —— Art — 392.10(B)(1)(a)

A box that encloses utilization equipment that projects more than 1-7/8 inches into the box shall have a depth that is at least the depth of the equipment plus ______. a) 1/8 b) 1/4 c) 3/8 d) 1/2

1/4 —- Art — 314.24(B)(1)

What is the minimum distance that nonmetallic sheathed cables must be supported from an 18 cubic inch device box without clamps? a) 6 b) 8 c) 12 d) 36

8 —- Art — 314.17(C) Exception

What type number should be marked on an outdoor use enclosure of a panelboard rated not over 600 volts nominal that must remain operable when ice covered? a) 3R b) 3S c) 4 d) 6P

3S —- Table 110.28 Note Asterisk by sleet

What is the minimum air space required between metal cabinets or cutout boxes and the supporting surface in a wet location? a) 1/8 b) 1/4 c) 3/8 d) 1/2

1/4 inches —- Art 312.2

When secondary high voltage wiring is installed for field installed skeleton tubing, the point of transition from the gas tubing cable to the electrode connection at the tube is to be made via a) listed assembly b) pressure connector c) flexible terminal bar d) thread forming device

listed assembly Art — 600.42(A)

In a dwelling unit when is it permitted to use non-metallic sheathed cable in a concealed stud space that is to be used as an environmental return air space? a) when the cable is marked NM-B b) Under no conditions c) when the cable is 12 awg or smaller d) when the cable is run perpendicular to the long dimension of the stud space

when the cable is run perpendicular to the long dimension of the stud space Art — 300.22(C) Exception

What should the overload protection for a 3-phase, design B, 25 HP, 480 volt motor be based on?

the motor nameplate full load amps Art — 430.32(A)(1)

What type of connection is required when transitioning from gas tubing cable to the electrode connection?

listed assembly

When is non-metallic sheathed cable permitted in environmental return air spaces?

when the cable is marked NM-B

What is the basis for overload protection selection for a 3-phase, 25 HP motor?

the motor nameplate full load amps

What is the maximum full load current of a stationary motor of under two horsepower permitted for installation with a 15 amp rated AC general use snap switch? a) 15 amps b) 12 amps c) It depends on the nameplate of the motor d) 10 amps

12 amps ## Footnote 2017 NEC 430.109(C)(2) 80%

What is the minimum ampacity required for single motor tap conductors from the point of the tap to a listed manual motor controller?

one-half ## Footnote 2017 NEC 430.53(D)(4)

A fuel dispensing system shall be provided with one or more clearly identified ____ or electrical disconnects a) current limiters b) emergency shutoff device c) surge protection device d) automatic reset device

Emergency shutoff device ## Footnote 2017 NEC 514.11(A)

The PV array of a photovoltaic system is provided with ground fault protection system. The ground fault protection system must do which of the following:

detect a ground fault in the PV array DC current carrying conductors including functional grounded conductor ## Footnote 2017 NEC 690.41 (B)(1)

The National Electrical Code requires that the nameplate of a battery powered pool lift shall contain which of the following information? a) amperage rating b) identifying name and model c) voltage rating d) Both B & C

Both B & C ## Footnote 2017 NEC 680.85 Exception

Grounding and bonding terminals used in swimming pool equipment shall be identified for use in wet and _____ a) damp locations b) dry locations c) classified locations d) corrosive environments

Corrosive environments ## Footnote 2017 NEC 680.7

What type of conduit is permitted to supply an underwater wet niche light fixture as per the National Electrical Code? a) RGS b) IMC c) PVC d) EMT

PVC ## Footnote 2017 NEC 680.23(B)(2)

Equipment for emergency sources of power shall be located in spaces protected by __ a) a fire protection system or in spaces with at least a 1 hour rating where located in an occupancy for more than 100 people b) sprinkler system or in spaces with at least a 2-hour fire rating c) fire protection system or in a space with at least a 1-hour fire rating where located in a business occupancy in a building that is 80 feet in height d) sprinkler system or in spaces with at least a 2-hour fire rating where located in a healthcare occupancy where a person is not capable of self perservation

fire protection system or in a space with at least a 1-hour fire rating where located in a business occupancy in a building that is 80 feet in height ## Footnote 2017 NEC 700.12(2)

A raceway contains 1/0 awg THHN copper conductors in an ambient temperature of 100 degrees F. There are only 3 current carrying conductors installed in the raceway and all terminations are rated at 75 degrees C. What is the maximum current permitted for the 1/0 awg conductors in amps? a) 170 b) 125 c) 150 d) 155

150 amps ## Footnote Table 310.15(B)(16) Page 150 1/0 THHN = 170 amps Table 310.15(B)(2)(a) page 147 170 X .91= 154.7 Ampacity of 1/0 cu awg @ 75 degree C = 150 amps

A 3 phase 480 volt delta system is balanced with a 30 kva load per phase. The total load is 90 kva. What is the line current a) 166.66 b) 96.22 c) 62.50 d) 108.25

108.25 30,000 VA / 480 = 62.5 (Phase amps) 62.5 X 1.732 = 108.25 (Line amps) Delta formulas Voltage of the line is the voltage between any two phases Phase Voltage = Line voltage Line Amps = Phase current X 1.732 Phase Amps = use ohms law

Which statement is correct for surge protection devices? a) are not permitted for circuits over 1000 volts b) are required for all Class 1 division 1 circuits c) are required for all Class 2 division 2 circuits d) are permitted to be connected between the ungrounded conductor and the grounding electrode conductor

are permitted to be connected between the ungrounded conductor and the grounding electrode conductor ## Footnote 285.27

The minimum size grounding electrode conductor permitted to a metallic water pipe and to a ground rod(s) for a 200 amp service supplied by 4/0 aluminum conductors shall be: 2awg copper water pipe, 4 awg copper ground rod b) 2awg aluminum water pipe, 4awg copper ground rod c) 4awg aluminum water pipe, 6 awg aluminum ground rod d) 4 awg copper water pipe, 6 awg copper ground rod

4 awg copper water pipe, 6 awg copper ground rod ## Footnote 250.66 & 250.66(A)

Where a copper conductor is used to form the equipotential bonding grid for a swimming pool the conductor shall have a minimum size of _____ awg a) 8 stranded b) 6 solid c) 8 solid d) 4 solid

8 solid ## Footnote 680.26(B)(1)(b)(1)

An Office building has a 3 phase 208/120 volt service. A 3 phase 208/120 volt subpanel is being installed that serves the following: 175 general use receptacles and 24,000 va of lighting load. The lighting load is considered continuous and the receptacles are considered non-continuous. What is the minimum size THWN copper conductors required to feed this subpanel? a) 3/0 AWG b) 1/0 AWG c) #1 AWG d) 250 Kcmil

1/0 AWG 2017 NEC Article 220 24000 X 1.25 = 30,000 VA 30,000 VA 175 General Receptacles @ 180 VA (220.14(I)) = 31,500 VA Table 220.44 First 10,000 @ 100% = 10,000 VA 10,000 VA Remainder (31,500-10,000) 21,500 VA @ 50% = 10,750 VA Total VA = 50,750 VA /208/1.732 = 140.87 amps 310.15(B)(16) 1/0 With an ampacity of 150 amps

What condition is considered for energized equipment operating on 120 volts to ground with exposed live parts on one side of the working space?

Condition 1 ## Footnote Based on the term 'Wall' and nothing specific.

Is a balcony that is attached and accessible from the inside of a dwelling required to have a receptacle outlet installed?

Yes. But where the balcony has a total area of more than 20 square feet ## Footnote 210.52(E)(3).

Where is the service disconnect required to be located when installed inside?

At a readily accessible location nearest the point of entry of the service entrance conductors ## Footnote 230.70(A)(1).

What is the minimum size aluminum grounding electrode conductor to the metallic water service coming into the building for two sets of parallel 350 kcmil copper service entrance conductors?

3/0 ## Footnote Refer to 250.66

What is the minimum conductor ampacity for service conductors supplying a single phase single family dwelling?

80 percent of the service rating ## Footnote Refer to 310.15(B)(7)(1)

Which of the following is not covered by the NEC for installation and removal of electrical conductors, equipment, and raceways?

Electrical substations ## Footnote A, B, C are specifically mentioned in 90.2(A) as being covered.

What is the change in length of 200 feet of rigid non-metallic conduit with a temperature change of 90 degrees F?

7.3 inches ## Footnote 90 degree temperature change = 3.65 inches per 100 feet; 3.65 x 2 = 7.3 inches.

In a hazardous location, what is the classification where the atmosphere contains combustible carbonized dusts at more than 8 percent?

Class II Group E ## Footnote Refer to 2017 NEC 500.6 (B)(2)

What is the minimum width of working space required for a 24-inch wide electrical panelboard with a 240/120 volt supply?

30 inches ## Footnote Refer to 2017 NEC Article 110.26(A)(2)

What must electrical metallic tubing contain when installed on a rooftop to supply air conditioning equipment?

It must contain a pull string for future circuits. ## Footnote NEC 440.9

What is required when a building is supplied by more than one service?

A permanent plaque is required. ## Footnote NEC 2017 230.2(E)

For a molded case circuit breaker rated at 20 amps, what must be shown if the interrupting rating is other than what?

It must be shown if other than 1000 amps. ## Footnote NEC 2017 240.83(C)

What is the approximate full load amperage of a 208/120 volt three phase 150 kW transformer?

The approximate full load amperage is 416 amps. ## Footnote 150kw X 1,000 = 150,000 VA 150,000/208/1.732 = 416.37 amperes or 416 amps

What is the minimum number of 20-amp branch circuits required for general lighting for a 2,500 square foot dwelling with a 240/120 volt single phase service?

The minimum number required is 4 branch circuits. ## Footnote 2,500X3= 7,500VA 20 amp br. cir. - 20 X 120 = 2,400VA 7,500 VA / 2,400VA = 3.125 or 4 branch circuits

What are equipment grounding conductors required to have?

They are required to have mechanical protection as well as adequate ground fault current carrying capacity. ## Footnote NEC 2017 250.4(A)(5)

What is the minimum size box required for a junction box with five #8 awg ungrounded conductors, three #8 awg equipment grounding conductors, and three clamps?

21 cubic inches ## Footnote 5 #8 awg = 5 X 3.00 cubic inches = 15 cubic inches; Equip Ground (Count only 1 time) = 3.00; Clamps (Count only one time) = 3.00; Total = 21 cubic inches.

In a cable tray with a single equipment grounding conductor and multiple circuits, the equipment grounding conductor size is based on?

The largest overcurrent device protecting the conductors in the tray ## Footnote Refer to 250.122 (C).

What is required for terminals used for electrical connections of more than one conductor?

Required to have all the conductors under the terminals be of the same size ## Footnote Refer to 110.14(A).

Which occupancies are required to have AFCI protection of branch circuits?

Multifamily dwelling ## Footnote Refer to 210.12(A).

What is the maximum size for a grounding electrode conductor or bonding jumper that is the sole connection to a concrete encased electrode?

6 awg copper ## Footnote Refer to 250.66 (B).

What is the term used for the connection of metallic parts to form an electrically conductive path that ensures electrical continuity?

Bonding ## Footnote Refer to Article 100 Definitions.

What must each vented cell of a stationary storage battery be equipped with?

A flame arrester ## Footnote Designed to prevent external spark of the frame under normal operating conditions.

What is the maximum additional amps that can be added per phase to a 150KVA three-phase transformer with a load of 220 amps per phase?

196 amps ## Footnote Calculation: 150,000/208/1.732= 416.37; 416.37-220 amps = 196.37 amps.

What type of conductors are permitted for a non power limited fire alarm system?

Conductors are permitted to be solid or stranded.

What is the minimum size service entrance conductors type THWN required for a single family dwelling service with a 200 amp main breaker?

2/0 ## Footnote Refer to Annex Page 800 Table.

What is the minimum branch circuit conductor size for a 5 HP motor on a 480-volt circuit?

14 ## Footnote 5 hp 480v motor FLC = 7.6 amps; 7.6 X 1.25 = 9.5 amps.

What is the minimum depth required for type UF cable carrying 30 volts for landscape lighting?

12 ## Footnote Refer to Table 300.5 Column 5.

What is the demand load for a 1500 square foot house with gas appliances and minimum small appliance and laundry circuits?

5,100 VA ## Footnote Total calculation: 4500 VA + 3000 VA + 1500 VA = 5100 VA

What is the required ground fault protection for a grounded wye service rated more than 150 volts to ground?

600 amps or more ## Footnote NEC 230.95

What is the maximum rating for the motor of a range hood when cord and plug connected?

1/8 hp ## Footnote NEC 422.16(B)(4)(2)

What is the maximum number of 14 AWG THHN conductors permitted in 3/8 flexible metallic conduit?

3 ## Footnote Refer to Table 348.22

What is required for a 120 volt pool pump circulation motor that is double insulated and hardwired?

Be provided with GFCI protection ## Footnote NEC 680.21 (B)&(C)

What rating must electrical penetration into an information technology room have?

Airtight rated ## Footnote NEC 645.3(A) Page 525

What does a furnace with a 1 HP motor protected by an accessible circuit breaker not require?

A disconnect if the unit is GFCI protected, the circuit breaker is 20-amps or less, provided with a unit switch, or located on the same floor as the circuit breaker. ## Footnote 422.31 (C) Exception

What is a receptacle designed to do?

Connect the equipment. ## Footnote Definitions Article 100

Are flexible power supply cords permitted to supply freestanding type office furnishings?

Yes, if the conductors are at least 14 awg. ## Footnote 605.5(1)

What percentage of the phase converter nameplate single phase input full load amps should the conductor ampacity be where a phase converter supplies variable loads?

125%. ## Footnote 455.6(A)(1)

What shall apply where the disconnecting means for a fluorescent luminaire is external and not attached to the luminaire?

The disconnecting means shall be readily accessible at a location nearest the luminaire. ## Footnote 410.130(G)(3)

What is the size of the equipment grounding conductors dependent upon?

The overcurrent device. ## Footnote Table 250.122

Is it permitted for outdoor antenna and lead in conductors to cross over open conductors of an electric lighting branch circuit?

b) permitted where it cannot be avoided, voltage is less than 250 volts between conductors and 2 foot clearance is maintained ## Footnote 810.13

What is the minimum size box allowed for 13 #12 awg conductors?

c) 4 X 2-1/8 ## Footnote Table 314.16

What is the minimum size THWN copper conductors permitted for a duty cycle service motor with a nameplate rating of 25 amps?

a) 6 awg ## Footnote Table 430.22(E) 1st Row 25 X 1.20 = 30 amps Table 310.15(B)(16)

What percentage of the load shall field wiring conductors between a heater and a supplementary overcurrent device not be less than?

a) 100 ## Footnote 424.22(E)

What is the power consumed by a fault connection with a total current rating of 27 amps and a resistance of .21 ohms?

d) 153 ## Footnote Ohms Law Cover of Uglys Book Watts Section You have amps and resistance Formula = R X I Squared 27 X 27 X .21 = 153 watts

What is required for a continuous ferrous metal conduit sleeve used to protect the grounding electrode conductor?

d) electrically continuous from the cabinet to the ground clamp ## Footnote 250.64(E) (1)

What demand percentage is added to the branch circuit sizing for a sign with a calculated load of 1,300 va operating for 12 hours a day?

125% ## Footnote 600.5(B), 210.19(A)(1)(a)

What is the maximum residual voltage of a capacitor that must be reduced to within 2 minutes after disconnection from a source over 1000 volts?

30 volts ## Footnote 460.28(A)

What is the required ampacity percentage of the branch circuit for central vacuum assemblies?

125% ## Footnote 422.15(B)

Under what conditions are conductors and equipment permitted by the code?

They must be approved ## Footnote NEC 2017 110.2

What is the allowable ampacity for each of three #1 AWG TW aluminum conductors installed in 115 degrees F?

49.3 amps ## Footnote 310.15(B)(16), 310.15(B)(2)(a) .58 Correction Factor

What is the approximate line current on a balanced 3-phase wye connected system with a maximum load per phase of 20,000 va and a line voltage of 208 volts?

167 amps ## Footnote 60,000/208/1.732 = 166.54

What is a device or group of devices that govern the electric power delivered to equipment?

controller ## Footnote Article 100 definition of controller

What does the available short circuit current at the line terminals of any overcurrent device determine?

will determine the ampere rating of the overcurrent device

What is the proper definition for wiring located under an outdoor canopy that is not exposed to direct saturation from water?

damp location ## Footnote Definition Article 100 Location, Damp

What is the minimum distance in inches a receptacle face must project beyond a metal face plate?

.025 ## Footnote 406.5(D)

What is the life safety branch a subsystem of?

health care facility ## Footnote 517.2

What is the maximum load in amps that a branch circuit supplying stage footlights, border lights, and proscenium sidelights can carry?

20 ## Footnote 520.41 (A)

Which of the following code provisions is correct for a wall mounted central vacuum outlet?

d) the accessible non current carrying metal parts of the central vacuum shall be connected to an equipment grounding conductor ## Footnote 422.15(C)

Equipment shall be installed and used in accordance with which instructions?

a) on the nameplate ## Footnote 110.3(B)

Electrified truck parking spaces shall be calculated at not less than?

b) 6 watts per square foot of parking space ## Footnote 626.11(A)

If a branch circuit supplies a single 14 amp non motor operated appliance without an overcurrent protection rating, the rating of the overcurrent protection device shall not exceed what percent of this appliance?

c) 125 ## Footnote 150% 422.11 (E)(3)

What is the maximum overcurrent protection rating for a non motor operated appliance that has a rating of 40 amperes?

c) 60 ## Footnote 150% 40 X 1.5 = 60 amps 422.11(E)(3)

Are class 2 remote control cables permitted to be strapped or attached to a raceway for support?

b) Yes, if the raceway is properly installed as per the National Electrical Code ## Footnote 725.143 then 300.11(C)(2)

Is a replacement luminaire with exposed metal parts permitted to be wired to an existing lighting outlet where no equipment grounding conductor is present?

No ## Footnote 410.44 Exception 3

Under what condition can a replacement luminaire with exposed metal parts be wired to an existing lighting outlet without an equipment grounding conductor?

Yes, if the circuit is GFCI protected ## Footnote 410.44 Exception 3

What is required for luminaires with exposed metallic parts?

They shall be provided with a means to connect all metal parts to the equipment grounding conductor ## Footnote 410.46

What must all luminaires and lampholders be?

They shall be listed ## Footnote 410.6

What is the requirement for a fluorescent light fixture located in a clothes closet with a 5-inch horizontal clearance to the nearest shelf?

The light fixture shall be completely enclosed ## Footnote Minimum of 6 inches, 410.16(C)(2)

What is the full load current rating of a single-phase heat pump with an 11.3 kW rating and a 208 volt supply?

54.3 amps ## Footnote Ohm's law: 11,300/208 = 54.32

What is the line current for a 208/120 volt three-phase system with a balanced load of 3000 VA per phase and a total load of 9000 VA?

25 amperes ## Footnote 9,000/208/1.732 = 24.98

What is the minimum demand load on the service entrance conductors for a dwelling unit with 3,000 square feet of habitable space?

7,725 volt amperes ## Footnote Calculation: 12,000 VA (habitable space) + 3,000 VA (small appliances) + 1,500 VA (laundry) = 16,500 VA; 16,500 VA - 3,000 VA = 13,500 VA; 13,500 VA @ 35% = 4,725 VA; Total = 4,725 VA + 3,000 VA = 7,725 VA.

What is the minimum size copper conductors required for a commercial building with a total load of 35,000 VA?

1/0 ## Footnote Calculation: 35,000 VA / 240 V = 146 amps; 1/0 THWN Conductor has an ampacity of 150 amps.

For which applications must remote control circuit conductors for safety equipment be physically protected?

Where damage to remote control equipment would introduce a life hazard ## Footnote Reference: 725.31 (B)

What is the required depth of working space for a 240/120 volt single family dwelling service with grounded parts on the opposite side?

3 feet ## Footnote Reference: Table 110.26(A)(1)

Which type of connector is NOT permitted to connect service entrance conductors to the service disconnect?

Solder type lugs ## Footnote Reference: 230.81

What is the required vertical clearance above the roof level for open conductors beyond the edge of the roof?

3 feet ## Footnote Reference: 220.19(A)

What is the minimum required clearance from the roof to the overhead service conductors for a 120/240 volt service on a 6:12 slope?

6 feet ## Footnote 230.24(A) Exception 2

Is a disconnecting means required for an accessory building to a single family dwelling?

Yes, and it shall be on the exterior of the structure ## Footnote 225.32

What material should a main bonding jumper be made of?

Corrosion resistant material ## Footnote 250.28(A)

What is the requirement for the continuity of a grounded conductor installed in a metallic enclosure?

It shall not depend on a connection to a metallic enclosure ## Footnote 200.2(B)

What should optional standby system transfer equipment prevent?

The inadvertent interconnection of normal and alternate sources of supply ## Footnote 702.5

What is the maximum wattage for lamps in class 3 locations without extending an exposed surface temperature?

320 degrees F ## Footnote 503.130(A)

What is the maximum full load current of a stationary motor of under two horsepower provided with a 15 amp rated AC general use snap switch?

12 amps

What is the minimum ampacity for single motor tap conductors from the point of the tap to a listed manual motor controller?

one-half

What must a fuel dispensing system be provided with?

one or more clearly identified emergency shutoff devices

What must the ground fault protection system of a photovoltaic system do?

detect a ground fault in the PV array DC current carrying conductors including functional grounded conductor

What information must the nameplate of a battery powered pool lift contain?

Both B & C

Where shall grounding and bonding terminals used in swimming pool equipment be identified for use?

in wet and damp locations

What type of conduit is permitted to supply an underwater wet niche light fixture?

PVC

Where shall equipment for emergency sources of power be located?

in spaces protected by a fire protection system or in spaces with at least a 1 hour rating where located in an occupancy for more than 100 people

What is the maximum current permitted for 1/0 awg THHN copper conductors in an ambient temperature of 100 degrees F?

170

What is the line current for a 3 phase 480 volt delta system balanced with a 30 kva load per phase?

108.25

What is correct for surge protection devices?

are permitted to be connected between the ungrounded conductor and the grounding electrode conductor

What is the minimum size grounding electrode conductor permitted to a metallic water pipe for a 200 amp service supplied by 4/0 aluminum conductors?

4 awg copper water pipe, 6 awg copper ground rod

What is the minimum size of a copper conductor used to form the equipotential bonding grid for a swimming pool?

8 solid

How should the equipment grounding conductor connected to the grounding terminals of an isolated ground receptacle be identified?

solid green insulation with one or more black stripes

What is the minimum temperature rating for power limited fire alarm cable?

75 degrees C

What is correct for the grounding bus in a separately derived system supplying sensitive electronic equipment?

it shall be bonded to the panelboard enclosure

What is the secondary current of a step up transformer with a primary of 120 volts and a secondary of 600 volts?

What is the maximum non-time delay fuse permitted for a three-phase design B squirrel cage motor with a FLC of 60 amps?

225

What is the minimum size THWN copper conductors required to feed a subpanel in an office building with a 3 phase 208/120 volt service?

1/0 AWG

What condition is considered when energized equipment operating on 120 volts to ground has exposed live parts on one side of the working space?

Is a balcony that is attached and accessible from the inside of a dwelling required to have a receptacle outlet installed?

Yes. But where the balcony has a total area of more than 20 square feet

Where is the service disconnect required to be located when installed inside?

at a readily accessible location nearest the point of entry of the service entrance conductors

What is the minimum size aluminum grounding electrode conductor to the metallic water service for an electrical service consisting of two sets of parallel 350 kcmil copper service entrance conductors?

2/0

What is the minimum conductor ampacity for service conductors supplying a single phase single family dwelling?

100

What does the NEC cover regarding installation and removal of electrical conductors, equipment, and raceways?

floating building

What is the change in length of 200 feet of rigid non-metallic conduit with a temperature change of around 90 degrees F?

3.6 inches

What is the classification in a hazardous location where the atmosphere contains combustible carbonized dusts at more than 8 percent?

Class II Group E

What is the minimum width of working space required for a 24-inch wide electrical panelboard with a 240/120 volt supply?

What must electrical metallic tubing contain when installed on a rooftop to supply air conditioning equipment?

must contain a wire type equipment grounding conductor

What is required when a building is supplied by more than one service?

a permanent plaque

What interrupting rating shall be shown on a molded case circuit breaker rated at 20 amps if other than how many amps?

10,000

What is the approximate full load amperage of a 208/120 volt three phase 150 kw transformer?

416

What is the minimum number of 20-amp branch circuits required for general lighting for a 2,500 square foot dwelling?

What are equipment grounding conductors required to have?

mechanical protection as well as adequate ground fault current carrying capacity

What is the minimum size box required for a junction box with five #8 awg ungrounded conductors?

What is the size of the equipment grounding conductor in a cable tray with multiple circuits?

the largest overcurrent device protecting the conductors in the tray

What is required for terminals that are used for electrical connections of more than one conductor?

required to be identified

Which occupancies are required to have AFCI protection of branch circuits?

multifamily dwelling

What is the maximum size of the grounding electrode conductor or bonding jumper that is the sole connection to a concrete encased electrode?

What is the term used for the connection of metallic parts to form an electrically conductive path?

bonding

What must each vented cell of a stationary storage battery be equipped with?

a flame arrester

How many amps can be added per phase to a three-phase 208/120 volt transformer with a rating of 150KVA and an existing load of 220 amps per phase?

196

What type of conductors shall be used for a non-power limited fire alarm system?

are permitted to be solid or stranded

What is the minimum size service entrance conductors type THWN required for a single family dwelling service with a main breaker of 200 amps?

2/0

What is the minimum branch circuit conductors for a 480-volt three-phase branch circuit serving a motor with a 5 HP rating?

What is the minimum depth required for type UF cable carrying 30 volts used for control landscape lighting?

What is the demand load for a 1500 square foot house with gas appliances and the minimum number of small appliance and laundry circuits?

6,300

What must a grounded wye service with a nominal voltage of more than 150 volts to ground be provided with when rated 600 amps or more?

ground fault protection

What is the demand load for one (1) 1500 square foot house with gas appliances?

12,000 ## Footnote Options: a) 12,000 b) 9,000 c) 5,100 d) 6,300

What is the minimum service rating that requires ground fault protection for a grounded wye service with a nominal voltage exceeding 150 volts?

600 amps ## Footnote Options: a) 600 amps b) 800 amps c) any size d) 1000 amps

What is the maximum motor rating for a range hood when cord and plug connected?

1/8 hp ## Footnote Options: a) the motor shall be rated at no more than 1/8 hp b) the length of the cord shall be between 18 and 48 inches long c) the receptacle for the hood shall be permitted to be on the small appliance branch circuit d) the circuit shall be rated at not over 15 amps

What is the maximum number of 14 AWG THHN conductors permitted in 3/8 flexible metallic conduit?

3 ## Footnote Options: a) 2 b) 3 c) 4 d) 5

What is required for a 120 volt pool pump circulation motor that is double insulated and hardwired?

be bonded to the pool equipotential bonding system ## Footnote Options: a) be located within sight of the pool b) be bonded to a ground rod c) be bonded to the pool equipotential bonding system d) be provided with GFCI protection

What rating must electrical penetration into an information technology room have?

airtight rated ## Footnote Options: a) airtight rated b) watertight rated c) fire rated d) no special requirements

When does a furnace with a 1 HP motor not require a disconnect?

located on the same floor as the circuit breaker ## Footnote Options: a) the unit is GFCI protected b) the circuit breaker is 20-amps or less c) provided with a unit switch d) located on the same floor as the circuit breaker

What is the purpose of a receptacle?

connect the equipment ## Footnote Options: a) support the equipment b) connect the equipment c) mate with the corresponding contact device d) transform the voltage

Are flexible power supply cords permitted to supply freestanding type office furnishings?

No, flexible cords are not permitted ## Footnote Options: a) Yes, if the conductors are at least 10 awg b) Yes, if the conductors are at least 12 awg c) Yes, if the conductors are at least 14 awg d) No, flexible cords are not permitted

What percentage of the phase converter nameplate input full load amps must the conductor ampacity be?

125 ## Footnote Options: a) 250 b) 80 c) 125 d) 100

What is required when the disconnecting means for a fluorescent luminaire is external?

the disconnecting means shall be readily accessible at a location nearest the luminaire ## Footnote Options: a) the disconnecting means shall be readily accessible at a location nearest the luminaire b) the overcurrent device for the branch circuit serving the luminaire shall be permitted as the disconnecting means c) A permanent plaque or directory shall be located on the luminaire designating the location of the disconnecting means d) the disconnect shall be located within sight of the luminaire

What does the size of the equipment grounding conductors depend upon?

overcurrent device ## Footnote Options: a) the line resistance b) overcurrent device c) line inductance d) line voltage

Is it permitted for outdoor antenna and lead in conductors to cross over open conductors of an electric lighting branch circuit?

permitted where it cannot be avoided, voltage is less than 250 volts between conductors and 2 foot clearance is maintained ## Footnote Options: a) prohibited b) permitted where it cannot be avoided, voltage is less than 250 volts between conductors and 2 foot clearance is maintained c) permitted if separation is at least 2 feet or greater d) permitted if separation is at least 6 feet or greater

What is the minimum size box allowed for 13 #12 AWG conductors?

4 X 2-1/8 ## Footnote Options: a) 4 x 1-1/2 b) 4-11/16 X 1-1/4 c) 4 X 2-1/8 d) 4 X 1-1/4

What is the minimum size THWN copper conductors permitted for a duty cycle service motor with a short time duty of 15 minutes and a nameplate rating of 25 amps?

8 AWG ## Footnote Options: a) 6 awg b) 8 awg c) 10 awg d) 12 awg

What percentage of the load must field wiring conductors between a heater and a supplementary overcurrent device be?

125 ## Footnote Options: a) 100 b) 80 c) 125 d) 175

What is the power consumed by a faulted connection with a total current rating of 27 amps and a resistance of .21 ohms?

54 watts ## Footnote Options: a) 5.7 b) 54 c) .2 d) 153

What must be true for a continuous ferrous metal conduit sleeve protecting the grounding electrode conductor?

electrically continuous from the cabinet to the ground clamp ## Footnote Options: a) isolated from the grounding electrode conductor b) identified with green paint c) threaded on both ends d) electrically continuous from the cabinet to the ground clamp

What demand percentage must be added to the branch circuit sizing for a sign with a calculated load of 1,300 VA operating for 12 hours a day?

125 ## Footnote Options: a) 125 b) 110 c) 115 d) 175

What is the maximum residual voltage of a capacitor that must be reduced within 2 minutes after disconnection from a supply over 1000 volts?

30 volts ## Footnote Options: a) 30 volts 2 minutes b) 30 volts 1 minute c) 50 volts 5 minutes d) 120 volts 10 seconds

What percentage of the central vacuum assembly must the required ampacity of the branch circuit be?

125 ## Footnote Options: a) 125 b) 75 c) 100 d) 80

What must conductors and equipment required or permitted by the code be?

approved ## Footnote Options: a) guarded b) approved c) accessible (as applied to equipment) d) inspected

What is the allowable ampacity for each of three #1 AWG TW aluminum conductors installed in an area with an ambient temperature of 115 degrees F?

49.3 ## Footnote Options: a) 49.3 b) 61.5 c) 85 d) 100.7

What is the approximate line current on a balanced 3-phase wye connected system with a maximum load per phase of 20,000 VA and a line voltage of 208 volts?

55 ## Footnote Options: a) 55 b) 96 c) 167 d) 288

What is a device that governs the electric power delivered to equipment?

controller ## Footnote Options: a) device b) controller c) disconnect d) circuit breaker

What will determine the ampere rating of the overcurrent device?

the available short circuit current at the line terminals of any overcurrent device ## Footnote Options: a) will determine the ampere rating of the overcurrent device b) will always be equal to the line short circuit current of the load side of the utility transformer c) shall not exceed the amperage interrupting capacity of the overcurrent device d) is not a factor provided the main overcurrent device is properly rated for the available short circuit current

What is the proper definition for wiring located under an outdoor canopy that is not exposed to direct saturation from water?

damp location ## Footnote Options: a) dry location b) wet location c) sealed location d) damp location

What is the minimum distance a receptacle face must project beyond a metal face plate?

.025 ## Footnote Options: a) .015 b) .020 c) .025 d) .030

What is the life safety branch a subsystem of?

an emergency power system required in a health care facility ## Footnote Options: a) hazardous location b) place of assembly c) health care facility d) high rise office building

What is the maximum load for branch circuits supplying stage footlights, border lights, and proscenium sidelights?

20 amps ## Footnote Options: a) 15 b) 20 c) 25 d) 30

What is required for a wall mounted central vacuum outlet?

the accessible non-current carrying metal parts of the central vacuum shall be connected to an equipment grounding conductor ## Footnote Options: a) the central vacuum shall be GFCI protected b) the central vacuum shall be permitted to contain only up to 1/4 hp motor c) the central vacuum shall not be permitted to be cord and plug connected d) the accessible non-current carrying metal parts of the central vacuum shall be connected to an equipment grounding conductor

What must equipment be installed and used in accordance with?

the instructions in the listing or labeling ## Footnote Options: a) on the nameplate b) in the listing or labeling c) in the code cycle of adoption d) in the manufacturers suggested instructions

What is the minimum calculation for electrified truck parking spaces per parking space?

6 watts per square foot of parking space ## Footnote Options: a) 8.5 kva b) 6 watts per square foot of parking space c) 2,400 va d) 11 KVA

What is the maximum overcurrent protection rating for a non-motor operated appliance rated at 40 amperes?

40 ## Footnote Options: a) 30 b) 60 c) 50 d) 40

What is the maximum overcurrent protection device rating for a single 14 amp non-motor operated appliance?

125 percent of this appliance ## Footnote Options: a) 100 b) 80 c) 125 d) 150

Are class 2 remote control cables permitted to be strapped or attached to a raceway for support?

No, the code prohibits this. ## Footnote Options: a) No, the code prohibits this. b) Yes, if the raceway is properly installed as per the National Electrical Code c) Yes, if the raceway is not flexible d) Yes, if the raceway contains power supply conductors for equipment for which the class 2 circuits are associated with.

Is a replacement luminaire with exposed metal parts permitted to be wired to an existing lighting outlet without an equipment grounding conductor?

No ## Footnote Options: a) No b) Yes, if the circuit is GFCI protected c) Yes, if installed indoors in rooms other than bathrooms d) Yes, if the luminaire is elevated at least 8 feet above the walking surface.

What must luminaires with exposed metallic parts be provided with?

a means to connect all metal parts to the equipment grounding conductor ## Footnote Options: a) a thermal cutoff device that will disconnect the luminaire in high temperature conditions b) internal overcurrent protection c) internal overload protection d) a means to connect all metal parts to the equipment grounding conductor

What must all luminaires and lampholders be?

listed ## Footnote Options: a) guarded b) enclosed c) listed d) identified

What must a fluorescent light fixture located in a clothes closet with open lamps do?

be removed or relocated ## Footnote Options: a) have GFCI protection b) partially enclosed c) completely enclosed d) removed or relocated

What is the full load current rating for a single phase heat pump with an 11.3 kW rating and a 208 volt supply?

54.3 amps ## Footnote Options: a) 21.3 amps b) 27.4 amps c) 35 amps d) 54.3 amps

What is the line current for a 208/120 volt three phase system with a balanced load of 3000 VA per phase?

15 amperes ## Footnote Options: a) 12.5 b) 15 c) 21.65 d) 25

What is the minimum demand load on the service entrance conductors for a dwelling unit with 3,000 square feet of habitable space?

7,725 volt amperes ## Footnote Options: a) 6,150 volt amperes b) 7,725 volt amperes c) 12,000 volt amperes d) 16,500 volt amperes

What is the minimum size copper conductors required for a commercial building with a total load of 35,000 VA?

2/0 ## Footnote Options: a) 3 b) 1/0 c) 2/0 d) 3/0

What must remote control circuit conductors for safety equipment be protected from?

where damage to remote control equipment would introduce a life hazard ## Footnote Options: a) network interface units b) room thermostat devices c) water temperature regulating devices d) where damage to remote control equipment would introduce a life hazard

What is the required depth of working space for a 240/120 volt single family dwelling service?

3 feet ## Footnote Options: a) 2 feet 6 inches b) 3 feet c) 3 feet six inches d) 4 feet

What type of connectors are not permitted for service entrance conductors connected to the service disconnect?

solder type lugs ## Footnote Options: a) solder type lugs b) clamp type connectors c) pressure washer type connectors d) set screw type pressure connectors

What is the vertical clearance required above the roof level for open conductors beyond the edge of the roof?

3 feet ## Footnote Options: a) 1 foot b) 2 feet c) 3 feet d) 4 feet

What is the minimum required clearance from the roof to overhead service conductors above a roof with a slope of 6:12?

6 feet ## Footnote Options: a) 4-1/2 feet b) 6 feet c) 3 feet d) 18 inches

Is a disconnecting means required for an accessory building to a single family dwelling?

Yes, and it shall be on the exterior of the structure ## Footnote Options: a) No b) Yes, and it shall be on the exterior of the structure c) Yes, and it shall be on the interior of the structure d) Yes, it shall be either in the interior or exterior of the structure

What must a main bonding jumper be made of?

corrosion resistant material ## Footnote Options: a) removed b) factory installed c) a sheet metal screw d) made of corrosion resistant material

What must the continuity of a grounded conductor installed in a metallic enclosure not depend on?

a connection to a metallic enclosure ## Footnote Options: a) be 6 feet or less b) have overcurrent protection c) be terminated with a sheet metal screw d) be not depend on a connection to a metallic enclosure

What must optional standby system transfer equipment prevent?

the inadvertent interconnection of normal and alternate sources of supply ## Footnote Options: a) AC and DC b) three or more c) normal and alternate

What material should be used for corrosion resistance?

Made of corrosion resistant material.

What is the maximum length for the continuity of a grounded conductor installed in a metallic enclosure?

6 feet or less.

What is required for the continuity of a grounded conductor installed in a metallic enclosure?

It shall not depend on a connection to a metallic enclosure.

What should optional standby system transfer equipment prevent?

The inadvertent interconnection of AC and DC sources of supply.

What should be clearly marked on luminaires in class 3 locations?

The maximum wattage of the lamps permitted without exceeding an exposed surface temperature.

What is the maximum exposed surface temperature in degrees F for luminaires in class 3 locations?

320 degrees F.

Branch circuit conductors that serve a 3-phase, 230 volt 30 Horsepower inductive type motor shall have an allowable ampacity of at least ______ amperes.

68, 88, 110, or 114

Where design and operation of a generator does not present overloading, the ampacity of the ungrounded phase conductors shall be at least _____ percent of the nameplate current rating of the generator.

80, 100, 115, or 125

A circuit that supplies a 1/2 hp motor that operates as utilization fastened in place in conjunction with other loads shall be calculated by adding the sum of the other loads plus _____ percent of the largest motor.

100, 125, 150, or 175

Where design and operation will prevent overloading, the conductors from the generator shall not be less than _____.

the same HP as the generator, 115 percent of the nameplate current, 115 percent of the HP of the generator, or 100 percent of the nameplate current

Transformers for signs located in an attic or soffit shall have a permanent walkway at least _____ inches wide.

12, 18, 24, or 36

In critical care areas where the basin and toilet are installed within the patient's room _____ protection for personnel shall not be required for receptacles.

AFCI, LFCI, Surge, or GFCI

Paddle fans are not permitted to be installed without GFCI protection ______.

in a kitchen, in a garage, outdoor or under an open porch, or over a hot tub located 8 feet above the water level

The minimum distance of the insulated cable conductor above the water level of the swimming pool is _____ ft.

14.5, 16.5, 22.5, or 25

For a dwelling unit the floor area for computing the lighting load should include all of the following except _____.

kitchen, bathroom, an open porch not adaptable for future use, or an unfinished basement intended for future living space

When sizing the branch circuit for a 50 gallon fixed storage type water heater the load shall be considered _______.

periodic, continuous, intermittent, or non-continuous

Electrical equipment mounted on the exterior to a concrete wall shall not be secured using ______.

lead anchors, toggle bolts, plastic anchors, or wooden plugs

Unused current transformers shall be _____.

removed, short circuited, marked as to show not in use, or reversed

In regards to an emergency system, a 4 pole transfer switch is used with a generator. Where is the grounding electrode connection to be made?

at the electrical service, at the generator, at the first distribution panel in the system, or no grounding electrode connection is required

The maximum overcurrent device permitted to protect a 22 awg cable tray cable is.

10, 5, 7, or 3

What is the largest required conductor to be installed to the ground rod for a photovoltaic system with a 10 foot ground rod?

14 awg, 10 awg, 6 awg, or 8 awg

What is the voltage drop on a single 240 volt 30 amp load that is being supplied by 10 awg copper THHN over 200 feet?

3 volts, 10 volts, 13 volts, or 15 volts

As per the NEC, where _____ person(s) are gathered for an event, this space is considered a(n) ______.

50, place of assembly; 100, classified location; 100, arena; or 100, place of assembly

Which of the following is not a violation of the National Electrical Code?

A kitchen countertop receptacle powers an exterior GFCI receptacle on an adjacent deck; A floodlight installed above a garage door; A GFCI protected receptacle not installed on a small balcony that measures 1 foot by 4 foot; or A duplex receptacle not installed behind a bedroom door where the wall space is 27" in length between the door and a closet door

For the life safety branch the maximum time lapse from normal power to emergency power is ________.

10 seconds, 30 seconds, 60 seconds, or 90 seconds

What is the minimum burial depth for a 120-volt, 20-amp, GFCI protected branch circuit installed with UF cable under a one family driveway?

18, 12, 6, or 24

What is the initial maximum permitted short-circuit, ground-fault setting of an inverse time circuit breaker for a single-phase, 240-volt, 5HP hermetic motor-compressor installed at a single family dwelling?

50 amps, 30 amps, 45 amps, or 40 amps

What shall be the minimum size THHN conductors used to supply a commercial store with a three-phase 208/120 volt wye service and a calculated load of 35,000 VA?

#2 awg, #3 awg, 2/0 awg, or #1 awg

A Class ____, Division ____ shall extend to a height of _____ and _____ out from a gasoline dispenser.

I, 2, 20 inches, 18 feet; I, 1, 18 inches, 20 feet; I, 1, 20 inches, 18 feet; or I, 2, 18 inches, 20 feet

What is the maximum overcurrent protection for a water heater supplied by a single phase, 208-volt service with a wattage rating of 3,380 watts?

30 amps, 25 amps, 20 amps, or 30 amps

A circuit has the following resistors connected in series: one (1) 5 ohm, one (1) 25 ohm, and one (1) 5 ohm. There is a voltage drop of 10 volts across the third resistor. Find the source voltage.

2 volts, 35 volts, 50 volts, or 70 volts

A contact device for the direct connection of electrical utilization equipment designed to mate with the corresponding contact device.

Lighting outlet, Intersystem bonding termination, Receptacle, or Switch

1 inch rigid metallic conduit (RMC) shall be supported at maximum intervals of ______ feet.

3, 12, 10, or 14

What is the maximum number of #12 THHN conductors that can be installed in 3/8 FMC where no equipment grounds are installed and the fittings are on the outside of the conduit?

3, 4, 1, or 2

A device that converts a broadband signal into component voice, audio, video, data and interactive service signals.....

Network Powered Communication Circuit, Network Terminal, Network Interface Unit (NIU), or Two-fer

In general, seals for cables installed in a class I division 1 location shall be installed within _______ of an enclosure.

24 inches, 18 inches, 12 inches, or 36 inches

In general conduits installed in a Class I division 1 location shall be installed with a seal within ______ of a panelboard enclosure.

36 inches, 24 inches, 12 inches, or 18 inches

Lampholders shall be constructed, installed, or equipped with shades or guards so that combustible material is not subjected to temperatures in excess of _____ degrees C.

60, 75, 80, or 90

Low voltage equipment that is frequently in contact with the bodies of persons or has exposed current-carrying elements shall operate on an electrical potential of ______ volts or less.

10, 30, 24, or 48

Where flexibility is required wiring methods to a floating building shall include all except:

liquidtight flexible metal conduit, electric nonmetallic tubing, liquidtight flexible nonmetallic conduit, or Extra hard usage portable power cable

All exposed metal surfaces within _____ feet of the inside walls of a hydromassage bathtub shall be bonded together.

5, 6, 8, or 10

An place that includes dedicated parking areas for heavy duty trucks at travel plazas, warehouses, shipper and consignee yards, depot facilities and border crossings is known as a ______ as per the NEC.

Industrial facility, commercial garage, Electrified Truck Parking Space, or parking space

Groups of individual office furnishings that are electrically connected are mechanically contiguous and do not exceed _____ when assembled shall be connected to the building electrical system by single flexible cord and plug.....

10 feet, 20 feet, 25 feet, or 30 feet

The electrical datum plane is ______ feet above the highest tide level for the area occurring under normal circumstances that is, highest high tide.

3, 2, 6, or 8

Where lighting outlets are installed for interior stairways, there shall be a light switch at each floor level where the stairway between floor levels has _____ risers or more.

8, 10, 4, or 6

Determine the minimum size THHN copper conductors required to supply a 3-hp, 240 volt single phase continuous duty motor when all terminations have a rating of 75°C.

10 AWG

A motor junction box shall be permitted to be separated from the motor by not more than ______ ft.

6 ft

Conductors supplying a 40 hp, 460-volt, three phase, 5 minute rated elevator motor with an ampere rating of 50 amperes marked on the nameplate, shall have an ampacity of at least ______.

62.5 amperes

Determine the minimum size THWN/THHN copper feeder conductors required to supply two (2) induction type, 208-volt, three phase, continuous duty motors; one (1) 10 hp and one (1) 15 hp.

4 AWG

Determine the maximum initial rating of nontime delay fuses for a 5 hp, 230-volt, three phase, continuous-duty motor.

45 amperes

Determine the absolute MAXIMUM standard size time delay fuses permitted for a 40 hp, 480 volt three phase induction type continuous duty motor.

125 amperes

What standard size time-delay fuses are required for the feeder overcurrent protection of a feeder supplying four (4) 15 hp, 480-volt three phase motors?

125 amperes

What is the size running overload protection, in amperes, required for a 2hp, 208-volt, single phase, squirrel cage motor with a temperature rise of 42°C?

15.00 amperes

What is the MAXIMUM size running overload protection, in amperes, required for a 2hp, 208-volt, single phase, squirrel cage motor with a temperature rise of 42°C?

15.60 amperes

Determine the MAXIMUM current setting permitted for overload protection for a motor with a thermal protector integral with the motor.

22.40 amperes

When an inverse time circuit breaker is used as a disconnecting means for a 7-1/2 hp, single phase, 240-volt motor, the circuit breaker must have a standard ampacity rating of at least ______.

50 amperes

A 20 amperes rated ac general-use snap switch is permitted for use as a disconnecting means for a 120-volt, single phase, ac motor when the motor has a rating of 2 hp or less and a full load current rating of ______ or less.

16 amperes

What is the full load current of a 3 phase 50 hp 480 volt synchronous type motor with a power factor of 80 percent?

61 amperes

What is the va input of a fully loaded three-phase, 208v, 3 hp motor?

2196 va

Circuit conductors supplying an adjustable speed drive system shall be sized at not less than ________.

125 percent of the rated input current to the drive

A 480 volt motor control center shall have its bus terminals spaced no less than _____ inches to ground?

1 inch

For a general use switch to be used as a disconnecting means for one (1) single phase, 1 hp, 208 volt, motor it shall have a minimum rating of _________ amps.

15 amps

What is maximum size motor branch circuit standard overcurrent protective device that can protect control circuit conductors size 8 awg copper?

90 amps

The frames of portable motors that operate over _______ volts to ground shall be guarded or grounded.

50 volts

A 1/0 copper conductor shall have ______ inches of bending space at the terminals of enclosed motor controllers when there is only one wire per terminal?

6 inches

What is the maximum locked rotor current of a 10 hp 3 phase 480 volt motor marked with a code letter E?

100

Conductors supplying a coal handling 15 minute rated motor shall be sized at _____ percent of the nameplate current rating.

125 percent

One 20 hp, 208v, three phase motor and three 2 hp 120v single phase motors are connected on the same feeder. The maximum size inverse time breaker for the feeder protection would be ______ amperes.

200 amperes

IF two-25hp, 208v, three phase motors are fed by the same feeder, the feeder conductors would be required to carry a minimum of _____ amperes.

200 amperes

The motor running overload protection for a 5 hp, 115v, single phase motor with a marked service factor of 1.2 would be _____ amps.

35 amps

"Delta Connected" means that the windings of three single-phase transformers are connected in _____ with each other.

a) series

What 4-wire system is called the "high leg" system because the voltage from one conductor to ground is between 190 volts and 208 volts to ground?

b) A Wye System

If the secondary voltage of a delta/delta transformer is 120/240V, the high leg voltage to ground (or neutral) is approximately _____.

b) 196V

On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, the conductor having the higher phase voltage to ground must be durably and permanently marked by an outer finish that's ______ in color.

d) orange

"______-connected" means a connection of three single phase transformer windings to a common point, with the other end of each winding connected to the line conductors.

b) Wye

What is the primary current for a fully loaded 45 KVA, 480 volt to 120/240V three phase transformer?

b) 54 Amps

What is the secondary line current for a fully loaded 45 KVA, 480V to 240V three-phase transformer?

c) 108 Amps

What is the primary line current for a fully loaded 22 KVA, 480V to 120/208V, three-phase transformer?

b) 26 Amps

What is the secondary line current for a fully loaded 22 KVA, 480V to 120/208V, three-phase transformer?

b) 27 amps

The primary overcurrent protection for a transformer rated 600 volts nominal or less having a primary current rating of over 9A or more must be set at not more than _____ percent of the primary current when using primary only overcurrent protection.

a) 125

Overcurrent protection for the secondary of a transformer rated 600V or less having a secondary current rating of 9A or more must be set at not more than ______ percent of the secondary current rating.

b) 125

A 45 KVA, 480V primary to 120/208V secondary, three phase transformer with a 70A primary overcurrent protection device will require at least _______ primary conductors. Assume terminations are rated at 75 degrees C.

c) 2 AWG

A 75 KVA, 480V primary to 120/208V secondary, three phase transformer with a 125A primary overcurrent device will require at least _____ primary conductors.

b) 4 AWG

A 45 KVA, 480V Primary to 120/208V secondary, three phase transformer with a 175A secondary overcurrent protection device will require at least _____ secondary conductors (secondary conductors are 10 ft long).

b) 4/0 AWG

A 75 KVA, 480V primary to 120/208V secondary, three phase transformer with a 300A secondary overcurrent protection device will require at least _____ secondary conductors (secondary conductors are 10 ft long).

b) 4/0 AWG

The primary line current of a three-phase, 37.50 KVA, delta/delta transformer with a 480V primary and a 120/240V secondary is closest to _____.

b) 50 amps

What is the secondary line current for a 45 KVA delta/delta transformer that has a line voltage turns ratio of 2:1 if the primary operates at 480 volts?

c) 108 amps

A 4,160V to 240V, three phase transformer is connected delta/delta. The secondary phase current is 300A and the secondary line voltage is 240V. How much current will be flowing in the primary conductors supplying the transformer (line current)?

c) 30 Amps

What is the primary line current for a delta/Wye 480V to 120/208V, three phase transformer that has a secondary line current of 200A?

c) 72 Amps

The secondary line current for a wye-connected transformer is approximately ______ if the secondary phase voltage is 277V and the load is 10 KVA three-phase.

c) 12 Amps

The maximum size overcurrent protection device for primary only protection of a three-phase, 37.5 KVA delta/delta transformer with a 480V primary and 120/240V secondary is _____.

c) 50 Amps

The maximum size overcurrent protection device for primary only protection of a three-phase, 45 KVA transformer with a 480V primary and a 120/208V secondary is ______.

c) 70 Amps

The maximum size overcurrent protection device for primary only protection of a three-phase 75 KVA transformer with a 480V primary and a 120/208V secondary is _____.

c) 125 Amps

The maximum size overcurrent protection device for primary only protection of a three-phase, 112.5 KVA transformer with a 480V primary and a 120/208V secondary is _____

b) 125 Amps

The maximum size overcurrent protection device for secondary side protection of a three-phase 45 KVA transformer with a primary of 480 volts and a secondary of 120/208 volts. Primary protection will be provided.

b) 150 amperes

The maximum size overcurrent protection device for secondary side protection of a three-phase 112.5 KVA transformer with a primary of 480 volts and a secondary of 120/208 volts. Primary protection will be provided.

a) 300 amperes

Assume both primary and secondary protection will be provided. The maximum size overcurrent protection device for both the primary & secondary side of a three-phase 500 KVA transformer with a primary of 480 volts and a secondary of 120/208 volts should be selected at _______ respectively.

b) 800 & 1,000 amperes

When a size 3 AWG copper conductor with THW insulation is installed in an area where the ambient temperature is 114° F, what is the allowable ampacity?

82 amperes

When a size 1/0 AWG aluminum conductor is installed in an ambient temperature of 45° C, what is the allowable ampacity?

104 amperes

For a 100 ampere load supplied with THWN copper conductors in an area where the ambient temperature reaches 110° F, what size THWN conductors are required?

2 AWG

What is the load limit on a size 6 AWG THHN copper conductor connected to a circuit breaker with a termination rated at 60° C?

60 amperes

What is the maximum load in amperes on a size 6 AWG THHN copper conductor connected to a fusible disconnect switch with terminals rated at 75° C?

75 amperes

What is the ampacity of a size 12/2 AWG w/ground copper NM cable installed in an attic where the ambient temperature is 125 degrees F?

14.5 amperes

What is the ampacity of a size 10/3 AWG w/ground copper NM cable installed in a crawl space where the ambient temperature is 100 degrees F?

30.0 amperes

What is the allowable ampacity of a size 1/0 AWG THW copper conductor installed in a conduit larger than 24 inches with three other current-carrying conductors?

120 amperes

What is the ampacity of a size 2 AWG THWN aluminum conductor installed in a 20-foot long conduit with seven other current-carrying conductors at 99 degrees F?

63 amperes

For a 100 ampere load in an environment where the temperature reaches 115 degrees F, what is the proper size wire with four 75 degrees C rated copper conductors?

2/0 AWG

What is the allowable ampacity of a size 10 AWG THWN copper conductor installed in a conduit three inches above a rooftop at 100 degrees F?

30.80 amperes

What is the minimum size THWN/THHN aluminum service entrance conductors required for a one-family dwelling with a demand load of 200 amperes?

4/0 AWG

What is the ampacity of eight current-carrying size 10 AWG THW copper conductors enclosed in an EMT 18 inches long?

28 amperes

For a 240-volt, single phase, 3 wire, 200 ampere non-continuous load in an area with an expected ambient temperature of 110 degrees F, what is the minimum size conductors required using 75 degrees C rated aluminum conductors?

350 kcmil

Under which conditions is the neutral NOT to be counted as a current carrying conductor?

I only

In grounded systems, normally noncurrent-carrying electrically conductive materials that are likely to become energized shall be connected _____ in a manner that establishes an effective ground-fault current path.

d. a and b

For grounded systems, electrical equipment and other electrically conductive material likely to become energized shall be installed in a manner that creates a ______ from any point on the wiring system where a ground fault may occur to the electrical supply source.

d. all of these

For grounded systems, electrical equipment and electrically conductive material likely to become energized, shall be installed in a manner that creates a low-impedance circuit capable of safely carrying the maximum ground-fault current likely to be imposed on it from where a ground fault may occur to the ______.

c. electrical supply source

Grounding and bonding connection devices that solely on ______ shall not be used.

b. solder

If the use of multiple grounding connections results in objectionable current and the requirements of 250.4(A)(5) or (B)(4) are met, it shall be permitted to ______.

d. any of these

Ungrounded alternating current systems from 50v to 1,000v or less that are not required to be grounded in accordance with 250.20(b) shall have _______.

c. a and b

Where the main bonding jumper is installed from the grounded conductor terminal bar to the equipment grounded conductor terminal bar in service equipment the _____ conductor is permitted to be connected to the equipment grounding terminal bar.

a. grounding

For grounded system an unspliced _____ shall be used to connect the equipment grounding conductor(s) and the service disconnect enclosure to the grounded conductor of the system within the enclosure for each service disconnect.

b. main bonding jumper

Where service entrance conductors are installed in parallel in two or more raceways or cables, the size of the grounded conductor in each raceway or cable shall be based on the total circular mil area of the parallel ungrounded service entrance conductors in the raceway or cable, sized in accordance with 250.24(C)(1), but not smaller than ______ awg.

b. 2/0

A grounded conductor shall not be connected to normally noncurrent-carrying metal parts of equipment on the _____ side of the system bonding jumper of a separately derived system except as otherwise permitted in Article 250.

a. supply

Where the supply side bonding jumper of the wire type is run with the derived phase conductors from the source of a separately derived system to the first disconnecting means, it shall be sized in accordance with 250.102(C), based on _______.

c. the size of the derived ungrounded conductors

The common grounding electrode conductor installed for multiple separately derived systems shall not be smaller than ______ AWG copper when using a wire-type connector.

a. 1/0

For a single separately derived system, the grounding electrode conductor that connects the grounded conductor of the derived system to the grounding electrode at the same point on the separately derived system where the _____ is connected.

c. system bonding jumper

In an area served by a separately derived system, the ______ shall be connected to the grounded conductor of the separately derived system.

d. a and b

For a separate building or structure supplied by a feeder or branch circuit, the grounded conductor can serve as the ground fault return path for the building/structure disconnecting means for existing installations made in compliance with previous editions of the Code as long as the installation continues to meet the condition(s) that _____.

d. all of these

In order for a metal underground water pipe to be used as a grounding electrode, it shall be in direct contact with the earth for _____.

b. 10 ft. or more

An electrode encased by at least 2 in. of concrete, located horizontally near the bottom or vertically and within that portion of a concrete foundation or footing that is in direct contact with the earth, shall be permitted as a grounding electrode when it consists of ______.

c. a or b

Local metal underground systems or structures such as ______ are permitted to serve as grounding electrodes.

d. all of these

Where the resistance to ground of 25 ohms or less is not achieved for a single rode electrode ______.

b. the single rod electrode shall be supplemented by one additional electrode

Buildings or structures supplied by multiple services or feeders shall use the same ______ to ground enclosures and equipment in or on that building.

c. grounding electrode system

Ferrous metal raceways and enclosures for grounding electrode conductors shall be bonded at each end of the raceway or enclosure to the grounding electrode or grounding electrode conductor to create a(an) ______ parallel path.

b. electrically

Interior metal water piping that is electrically continuous with a metal underground water pipe electrode and is located more than ______ ft. from the point of entrance to the building shall not be used as a conductor to interconnect electrodes of the grounding electrode system.

c. 5

What size copper grounding electrode conductor is required for a service that has three sets of 600 kcmil copper conductors per phase?

b. 1/0 AWG

Metal components in a run of underground nonmetallic raceway and isolated from possible contact by a minimum cover of _____ in. to all parts of the metal components shall not be required to be connected to the grounded system conductor, supply side bonding jumper, or grounding electrode conductor.

b. 12

Short sections of metal enclosures or raceways used to provide support or protection of _____ from physical damage shall not be required to be connected to the equipment grounding conductor.

a. conduit

Metal components shall not be required to be connected to the equipment grounding conductor or supply side bonding jumper where the metal components are ______.

c. a or b

Bonding jumpers for service raceways shall be used around impaired connections such as ______.

d. any of these

The intersystem bonding termination shall ______.

d. all of these

Where installed to reduce electrical noise for electronic equipment on the grounding circuit, a metal raceway can terminate to a(n) _______ nonmetallic fitting(s) or spacer on the electronic equipment.

a. listed

For circuits over 250 volts to ground, electrical continuity can be maintained between a box or enclosure where no oversized, concentric, or eccentric knockouts are encountered, and a metal conduit by ______.

d. all of these

What is the minimum size copper supply-side bonding jumper for a service raceway containing 4/0 THHN aluminum conductors?

c. 4 AWG copper

A service is supplied by three metal raceways, each containing 600 kcmil ungrounded conductors. Determine the copper supply side bonding jumper for each service raceway.

b. 3/0 AWG

Which of the following appliances installed in residential occupancies need not be connected to an equipment grounding conductor?

b. An aquarium

An equipment grounding conductor shall be identified by ______.

c. a continuous outer finish that is green with one or more yellow stripes

Listed FMC can be used as the equipment grounding conductor if the length in any ground return path does not exceed 6 ft. and the circuit conductors contained in the conduit are protected by overcurrent devices rated at _____ or less.

b. 20A

Provide the minimum size aluminum equipment grounding conductor for a feeder that is protected by an 800 amp overcurrent protective device.

a. 2/0

A feeder that is protected by a 1600 amp overcurrent protective device consists of four (4) sets of 600 kcmil installed in four (4) sets of 4 in. EMT. What is the minimum size copper equipment grounding conductor to be installed in each of the 4 in. EMT?

b. 3/0

A 200 amp copper feeder needed to be upsized to 400 kcmil for voltage drop considerations, provide the minimum size copper equipment grounding conductor to be installed with these feeders.

d. 3/0 awg

A 40 HP, 3 phase 480 volt continuous duty squirrel cage motor is being protected by a maximum permitted instantaneous trip circuit breaker. What is the minimum size equipment grounding conductors to be run with the branch circuit conductors?

a. #4 awg

Given: One (1) 100 amp disconnect switch is being supplied by a feeder tap less than 10 ft. long off of 1200 amp rated feeder. Find the minimum size equipment grounding conductor to be run with the tap conductors. Assume all terminations are rated at 75 deg. C.

a. #8 awg

JV Test 1 Flashcards

(388 cards)