Journeyman Exam Flashcards
(287 cards)
1
Q
What is used to increase or decrease AC voltages?
A
Transformer
2
Q
What is the full-load current rating of a 240-Volt, single-phase 10kW commercial dishwasher?
A
42 Amps
10kWx1000/240=41.6A
I=P/E
3
Q
What is the full load current rating of a 15 kW, 208V, single phase heat pump?
A
72 Amps
15kWx1000/208=72A
I=P/E
4
Q
What is the total resistance of a 10 Ohm, a 15 Ohm, and a 20 Ohm resistor connected in series?
A
45 Ohms
10+15+20+25=45
RT=R1+R2+R3
5
Q
The voltage drop for two 12 AWG conductors(0.40 ohms) that supply a 16A load and are located 100 ft. from the power supply?
A
6.40 Volts
16Ax .40=6.40V
EVD=IxR
6
Q
What is the purpose of the NEC?
A
The practical safeguarding of persons and property
90.2(A)
7
Q
What is the term for a device used to adapt a circuit from one configuration of an attachment plug or receptacle to another of the same current rating?
A
Adapter
Article 100 Definitions
8
Q
The NEC defines a conductor’s ampacity as “the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its:
A
Temperature Rating
Article 100 Definitions
9
Q
Connected to establish electrical continuity and conductivity is defined as:
A
Bonded(Bonding)
Article 100 Definitions
10
Q
What is the term for insulated conductors enclosed overall in a nonmetallic jacket?
A
Non-Metallic Sheathed Cable
Article 100 Definitions. Cable, Nonmetallic-Sheathed (Type NM)
11
Q
A continuous load, as defined by the NEC is a load where the maximum current is expected to continue for___ hours or more?
A
Three
Article 100 Definitions. Continuous Load
12
Q
Emergency Power Systems are intended to automatically supply power and/or illumination that is essential for___ and are legally required and classed as emergency by any governmental agency having jurisdiction.
A
Safety to human life
700.2 Definitions. Emergency Systems
13
Q
What is a Ground-Fault Circuit Interrupter(GFCI)?
A
A device to protect personnel that deenergizes a circuit or portion thereof within an established period of time when a ground-fault current exceeds the values established for a Class A device
Article 100 Definitions. Ground-Fault Circuit Interrupter(GFCI)
14
Q
Connected(connecting) to ground or to a conductive body that extends the ground connection.
A
Grounded(Grounding)
Article 100 Definitions. Grounded(Grounding)
15
Q
True or False: Where this code specifies that one equipment shall be “in sight from”, “within sight from”, or “within sight”, and so forth, of another equipment, the specified equipment is to be visible and not more than 15M(50 FT) distant from the other.
A
True
Article 100 Definitions. In Sight From
16
Q
Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction is:
A
Labeled
Article 100 Definitions. Labeled
17
Q
What is the term for a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating, or of operation of equipment in excess of normal, full load rating? This does not include a ground fault or a short circuit, or any other kind of fault.
A
Overload
Article 100 Definitions. Overload
18
Q
The overhead conductors between the utility electric supply system and the service point are known as a:
A
Service Drop
Article 100 Definitions. Service Drop
19
Q
Conductors sizes are expressed in___ or in circular mils.
A
American Wire Gauge(AWG)
110.6 Conductor Sizes
20
Q
When equipment is intended to interrupt power at fault levels, it must have an interrupt rating at least the nominal___ of the circuit, and the current available at the line terminals of the equipment.
A
Voltage
110.9 Interrupting Rating
21
Q
The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the___ temperature rating of any connected termination, conductor, or device.
A
Lowest
110.14(C) Temperature Limitations
22
Q
For a size 6 AWG THHW copper conductor connected to a fusible disconnect switch with terminals rated for 75C, what is the maximum current load, in amperes?
A
65 Amperes
110.14(C)(1) Equipment Provisions.
Table 310.16
23
Q
The conductor on a 4-wire, delta-connected system, since it has higher voltage to ground, if the grounded conductor is also present to supply lighting or similar loads, shall be identified by which color?
A
Orange in color or by other effective means
110.15 High Leg Marking
24
Q
Disconnecting means shall be capable of being___ in the open position.
A
Locked
110.25 Lockable Disconnecting Means
25
In front of electric equipment, the working space width must be at least___, or the width of the equipment, whichever is greater.
30 Inches
110.26(A)(2) Width of working space
26
In front of electric equipment, the working space must have space for doors or hinged panels to open___ degrees or more.
90 Degrees
110.26(A)(2) Width of working space
27
Support structures or other equipment for electrical installations, located above or below, may not extend more than___ beyond the front of the equipment.
6 Inches
110.26(A)(3) Height of working space
28
For the work space in front of a 120/240 Volt, single phase, 400 ampere rated disconnect switch located in a commercial occupancy, what is the minimum required height?
6.5 Feet
110.26(A)(3) Height of working space
29
The space equal to the width and depth of the equipment and extending from the floor to a height of___ above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation.
6 Feet
110.26(E)(1)(a) Dedicated Electrical Space
30
How should an insulated grounded conductor 6 AWG or smaller be identified?
3 white stripes on any color insulation but green, a continuous outer gray or white finish or several other options
200.6(A)
31
Grounded(Neutral) conductors larger than size 6 AWG may be identified by the terminations having__ colored phase tape, at the time of installation.
White
200.6(B)
32
For devices with screw shells, the terminal for the ___ conductor shall be the one connected to the screw shell.
Grounded
200.10(C)
33
For conductors on a branch circuit that supplies luminaires in a residence, what is the maximum allowable voltage between conductors on a branch circuit supplying luminaires in a residence?
120 Volts
210.6(A)(1)
34
True or False: In dwelling units, all 125-volt, single phase, 15- and 20- ampere receptacles installed in the following locations shall have ground-fault circuit-interrupter(GFCI) protection for personnel; areas with sinks and permanent provisions for food preparation, beverage preparation, or cooking, basements, bathrooms, bathtubs, or shower stalls with receptacles installed within (6 FT) of the outside edge, boathouses, crawl spaces- at or below grade level, garages & accessory buildings at or below grade level, indoor damp and wet locations, kitchens, laundry areas, outdoors, sinks with receptacles installed within (6 FT) of the top inside edge of the bowl.
True
210.8(A)
35
Where should type AC cable not be used?
In damp or wet locations or where subject to physical damage
320.12
36
Where receptacles in kitchens are made available to serve countertop surfaces, what outlets must be GFCI protected?
All
210.8(A)(6)
37
What total minimum volt-amperes(VA) shall be included when calculating the demand load for small appliance and laundry circuit loads for a one family dwelling?
4500 VA
210.11(C)
38
Sinks located in areas other than kitchens where receptacles are installed within__ of the outside edge of the sink, require GFCI protection.
6 Feet(1.8M)
210.8(A)
39
The total__ load and the rating or size of circuits used will determine the minimum number of branch circuits.
Calculated
210.11(A)
40
Listed Arc-Fault circuit interrupters should protect all 120-Volt, single phase, 15- and 20- ampere branch circuits in dwelling units, supplying outlets installed in:
Dining, family & living rooms, hallways, kitchens, libraries & parlors
210.12(B)
41
If a branch circuit served by size 12 AWG conductors is protected by a 15- ampere circuit breaker, what kind of rating does it have?
15 Amperes
210.18
42
Branch circuit conductors must have an ampacity of at least the __ load to be served, after any adjustments or corrections.
Maximum
210.19
43
When a branch circuit supplied any combination of noncontinuous and continuous loads, the minimum branch circuit conductor size, before the application of correction or adjustment factors, must have an allowable ampacity of at least ___ of the continuous load plus the noncontinuous load. Exceptions ignored.
125 Percent
210.19
44
What is the minimum voltage recommended by the NEC for a 40A, 240V rated single phase load that is a total of 200 ft from a panelboard(150 ft from load to junction box, 20 ft from junction box to panelboard) where the panelboard is 240 Volts?
232.8 Volts
240x3%=7.2V
240-7.2=232.8V
215.2(A)(2)
45
The overcurrent device size required for a 45A continuous load for a circuit in a raceway with 14 current carrying conductors is:
60 Amperes
45Ax125%=56.25A
210.20(A)
215.3
46
When a 20 ampere branch circuit serves a single receptacle outlet, the rating of the receptacle generally must be at least:
20 Amperes
210.21(B)(1)
47
What is the maximum rating allowed of any one cord and plug connected appliance connected to a 20 ampere branch circuit?
16 Amperes
20Ax80%=16A
210.23(B)(1)
48
Appliance receptacles outlets installed in a dwelling unit for specific appliances, such as laundry equipment, shall be installed within ___ feet of the intended location of the appliance.
6 Feet
210.50(C)
49
Required 125 volt, 15 and 20 ampere receptacles in dwelling units shall not be located higher than ___ feet above the floor.
5.5 Feet(1.7M)
210.52
50
Required 125 volt, 15 and 20 ampere receptacles in dwelling units shall be installed so that no pint measured horizontally along the floor line of any wall space is more than __ feet from a receptacle outlet.
6 Feet(1.8M)
210.52(A)(1)
51
Required 125 volt, 15 and 20 ampere receptacles in dwelling units shall be installed in any wall space __ feet or more in width.
2 Feet(600MM)
210.52(A)(2)
52
A general use receptacle outlet must be provided in any dwelling unit bedroom wall that is at least ___ wide.
2 feet(600MM)
210.52(A)(2)
53
Unless they are within __ of the wall, receptacle outlets in floors may not be counted as a part of the minimum required number of receptacle outlets.
1.5 Feet(18 In)
210.52(A)(3)
54
Receptacles installed in a kitchen to serve countertop surfaces shall be supplied by not fewer than ___ small appliance branch circuits.
Two
210.52(B)(3)
55
A receptacle outlet shall be installed so that no pint along the wall line is more than ___ inches from a receptacle outlet.
24 Inches(600MM)
210.52(C)(1)
56
Receptacles outlets must be no more than__ above a work surface or countertop.
20 inches(500MM)
210.52(C)(3)
57
If a receptacle is installed in a countertop, it must__ for such use.
Listed
210.52(C)(3)
58
Receptacles installed in work surfaces must be listed for:
Work surfaces or countertops
210.52(C)(3)
59
For dwelling units, at least one receptacle outlet accessible at grade level and not more than __ feet above grade shall be installed at the front and back of each dwelling.
6.5 Feet(2.0M)
210.52(E)(1)
60
What is the maximum distance a receptacle in a residential garage may be from the floor?
5.5 Feet(1.7M)
210.52(G)(1)
61
In dwelling units, hallways of __ feet or more in length shall have at least one receptacle.
10 Feet(3.0M)
210.52(H)
62
What is the minimum number of general purpose receptacles required to be readily accessible when installed in sleeping rooms of dorms, or guest rooms of hotels and motels?
Two
210.60(B)
63
One receptacle outlet shall be installed at an accessible location for the servicing of heating, air conditioning, and refrigeration within ___ feet and on the same level as the equipment.
25 Feet(7.5M)
210.63
64
At least one wall switch controlled lighting outlet shall be installed in every __ room, kitchen, laundry area, and bathroom.
Habitable
210.70(A)(1)
65
For dwelling units and garages, at least one wall switch controlled lighting outlet shall be installed to provide illumination on the ___ side of outdoor entrances of exits with grade level access
Exterior
210.70(A)(2)
66
Interior stairs shall have switches at each end, where the stairway between floor levels has __ risers or more.
Six
210.70(A)(2)
67
At least one __ containing a switch or controlled by a walls switch must be installed attics or underfloor spaces containing equipment requiring servicing, such as heating, air conditioning, and refrigeration equipment. One or more pointy of control should be at the normal point of entry for such spaces.
Lighting Outlet
210.70(C)
68
The calculated load for circuits supplying lighting units that have autotransformers, ballasts, or transformers will be based on:
Total ampere ratings of units and not total watts of the lamps
220.11(B)
69
The load for an electric sign or outline lighting system should be computed at a minimum of __ volt-amps when sizing the service calculation.
1200
220.14(F)
70
Loads for convenience receptacle outlets shall be computed at not less than__ volt-amperes for each single or each multiple receptacle on one yoke.
180
220.14(I)
71
General lighting in dwelling units is required to have a unit load of at least __ VA.
3
220.41
72
For a dwelling with 2600 square feet of habitable space, what is the required minimum number of 15 ampere, 120 volt, general lighting branch circuits?
5 Lighting Circuits
2600 sq. ft x 3VA=7800 VA (total lighting VA of house)
120V x 15A=1800 VA (one circuit)
7800 VA(load) / 1800 (one circuit)=4.3=5
73
If they are served by the same feeder or service in a one family, two family, or multifamily dwelling, is is allowable to apply a demand factor of 75% to the nameplate rating load of __ or more appliances fastened in place, other than air conditioning equipment, clothes dryer, electric ranges, or space heating equipment
4
220.53
74
The load for household electric clothes dryers in a dwelling unit(s) shall be__ watts(volt-amperes) or the nameplate rating, whichever is larger, for each dryer served.
5000
220.54
75
What is the feeder demand for a 4.40kW electric clothes dryer in a dwelling unit?
5kW
220.54
76
The branch circuit demand load for one 6kW cooktop and two 3kW ovens in a dwelling unit would be:
8kW
220.55(Note 5 & 6)
77
Overhead conductors for festoon lighting shall not be smaller than__ AWG unless the conductors are supported by messenger wires.
12 AWG
225.6(B)
78
When overhead conductors for festoon lighting are in spans more than__ ft., they must be supported by messenger wire. All such conductors may not be less than 12 AWG unless supported by messenger wires.
40 Feet(12M)
225.6(B)
79
When overhead spans of open conductors and open multiconductor cables of 600 volts or less, nominal, with a voltage of 150 volts to ground or less, pass over sidewalks, or come from any platforms or projection where someone might reach them, and accessible to pedestrians only, the minimum clearance is __ ft.
10 Feet(3.0M)
225.18
80
What is the minimum clearance in feet for overhead spans of open conductors and open multiconductor cables of 600 volts or less, nominal, over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground?
12 Feet(3.7M)
225.18
81
What is the minimum clearance over residential driveways of overhead spans of open conductors of up to 300 volts to ground?
12 Feet(3.7)
225.18
82
The minimum clearance over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage is over 300 volts to ground is:
15 Feet(4.5M)
225.18
83
Where overhead spans of open conductors and open multiconductor cables of 600 volts or less, nominal, pass over alleys, driveways on other than residential property, parking areas subject to truck traffic, roads, and other land traversed by vehicles such as cultivated, forest, grazing, and orchard, the clearance must be at least:
18 Feet(5.5M)
225.18
84
When overhead spans of open conductors and open multiconductor cables pass over a roof, the vertical clearance must be at least__ above the surface. Exceptions ignored.
8.5 Feet(2.6M)
225.19(A)
85
When overhead spans of open conductors and open multiconductor pass over a roof, the vertical clearance must be maintained for at least __ ft. in all directions from the edge of the roof. Exceptions ignored.
3 Feet(900MM)
225.19(A)
86
Final Spans to buildings shall be permitted to be attached to the building, but they shall be kept not less than__ feet from windows that are designed to be opened.
3 Feet(900MM)
225.19(D)(1)
87
Where raceways are on exteriors of buildings or other structures, they must be arranged so they drain, and designated as __ for wet locations.
Suitable for use
225.22
88
The disconnecting means for a building or structure served, where the conductors p[ass thorough the building or structure, must be installed___, and it must be in a readily accessible location, closest to the point of entrance of the conductors. Exceptions ignored.
Either inside or outside
225.32(B)
89
The disconnecting means shall be at a __ accessible location nearest the point of entrance of the conductors.
Readily
225.32(B)
90
There shall be no more than __ disconnects per supply grouped in any one location.
Six
225.33
91
Each disconnect shall be marked to indicate the __ served.
Load
225.34
92
In a multiple occupancy building, each occupant shall have __ to the occupants supply disconnecting means.
Access
225.35
93
When there are a combination of branch circuits, feeders, or services for a building or structure__ there must be a directory or permanent plaque installed at each branch circuit disconnection location and feeder, showing other branch circuits, feeders, and services supplying the building or structure or passing through it, and what area is served by each one
Passing through it or supplying it
225.37
94
For a one family dwelling, the feeder disconnecting means shall have a rating of not less than__ amperes, 3-wire.
100
225.39(C)
95
When conductors are installed under at least __ in. of concrete beneath a building or other structure, they shall be considered outside of a building or other structure.
2
230.6
96
When conductors are installed within a building or other structure in a raceway that is encased in concrete or brick at least __ in. think, they shall be considered outside of a building or other structure.
2 Inches (50MM)
230.6
97
Conductors other than service conductors shall not be __ in the same service raceway or service cable.
Installed
230.7
98
Generally, service conductors installed as open conductors must have a minimum clearance of __ from balconies, doors, porches, and windows that are designed to be opened.
3 Feet(900MM)
230.9(A)
99
Overhead service drop conductors shall have a vertical clearance of not less than __ feet above the roof surface.
8.5 Feet(2.6M)
230.24(A)
100
What is the minimum vertical clearance from final grade for open overhead service conductors up to 1000 volts over public driveways?
12 Feet(3.7M)
230.24(B)
101
Service entrance cables shall be supported at intervals not exceeding __ inches.
30 Inches(750MM)
230.51(A)
102
Service entrance cables shall be supported by straps or other approved means within __ inches of every service head, gooseneck, or connection to a raceway or enclosure.
12 Inches(300MM)
230.51(A)
103
Service entrance cables must be equipped with a __ listed for use in wet locations.
Service Head
230.54(B)
104
Service disconnecting means shall not be installed in___.
Bathrooms
230.70(A)(2)
105
What is the minimum rating for a service disconnecting means when supplied with a 120/240 volt, 3-wire, single phase service for a one family dwelling?
100 Amperes
230.79(C)
106
Conductors must be protected against overcurrent in accordance with their ampacities, except for:
Flexible cords, flexible cables, and fixture wires
240.4
310.14
107
Overcurrent devices are designed to open all conductors of a circuit, including a grounded conductor, so that no pole can operate__, so other than overload protection no overcurrent device may be connected in series with any conductor that has been intentionally grounded.
Independently
240.22
108
Overcurrent devices must be readily accessible and installed so the center of the operating handle grip of the circuit breaker or switch, when in its highest position, is___ above the floor or working platform, or less. Exceptions ignored.
6 Feet 7 Inches(2.0M)
240.24(A)
109
What dwelling unit area are panelboards NOT allowed to be located in?
Bathrooms
240.24(E)
110
Plug fuses of the Edison base type shall be classified at not over 125 volts and __ amperes and below.
30 Amperes
240.51(A)
111
Which of the following is only for replacements in existing installations and is NOT allowed in new installations?
Class H renewable cartridge
240.60(D)
112
Circuit breakers used as__ in 120 volt and 277 volt fluorescent lighting circuits shall be listed and shall be marked SWD or HID.
Switches
240.83(D)
113
Electrical Systems that are__ shall be connected to earth in a manner that will limit the voltage imposed by lighting, line surges, or unintentional contact with higher-voltage lines and that will stabilize the voltage to earth during normal operations.
Grounded
250.4(A)(1)
114
Normally non-current-carrying conductive materials enclosing electrical conductors or equipment shall be connected together, and to the electrical supply source, in a manner that establishes an effective__ current path.
Ground-Fault
250.4(A)(3)
115
The earth shall not be considered an__ ground-fault current path.
Effective
250.4(A)(5)
116
Sheet metal screws shall not be permitted to be used to connect __ conductors or connection devices to enclosures.
Grounding
250.8(A)
117
Nonconductive coatings(such as paint, lacquer, and enamel) on equipment to be grounded shall be___ from threads and other contact surfaces to ensure good electrical continuity.
Removed
250.12
118
A grounding electrode conductor for a premises wiring system supplied by a grounded ac electrical service must be connected to:
The grounded service conductor
250.24(A)
119
Where the service- entrance phase conductors are installed in parallel, in two or more raceways, the size of the grounded conductor in each raceway shall not be smaller than__ AWG.
1/0
250.24(D)(2)
120
What is the minimum length, in feet, for rod and pipe ground electrodes made of specific materials?
8 Feet(2.44M)
250.52(A)(5)
121
For metal underground water pipe to serve as a grounding electrode, it must be in direct contact with the earth for a minimum of:
10 Feet(3.0M)
250.52(A)(1)
122
Where at least__ ft. of a single structural member of a metal building or structure frame is in direct contact with the earth or encased in concrete that is in direct contact with the earth, it is allowed to be used as a grounding electrode.
10 Feet(3.0M)
250.52(A)(2)
123
Rod and pipe electrodes shall not be less than__ feet in length.
8 Feet(2.44M)
250.52(A)(5)
124
What is the minimum length, in feet, for a rod and pipe ground electrodes made of specific materials?
8 Feet(2.44M)
250.52(A)(5)
125
Rod type grounding electrodes made of stainless steel and copper, or zinc-coated steel must be at least__ in diameter, unless it is listed.
5/8"
250.52(A)(5)
126
What is the minimum electrical trade size for grounding electrodes made of conduit or pipe?
3/4"(Metric Designator 21)
250.52(A)(5)
127
If multiple rod, pipe, or plate electrodes are installed to meet the grounding requirements shall not be less than__ apart.
6 Feet(1.8M)
250.53(A)(3)
128
If more than one grounding electrode is effectively bonded together, they are considered:
A single grounding electrode system
250.53(B)
129
What may not be relied on for continuity of ground path or bonding connection to interior piping?
Water meters or filtering devices and similar equipment
250.53(D)(1)
130
Where the supplemental electrode is a rod, pipe, or plate electrode, that portion of the bonding jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than__ copper wire.
6 AWG
250.53(E)
131
What material must a grounding electrode conductor be made of?
Copper, aluminum, or copper-clad aluminum
250.62
132
A 6 AWG grounding electrode conductor may be run along the surface of a buildings construction without a metal covering or protecting if it is protected from exposure to physical damage, and:
Securely fastened to the construction
250.64(B)
133
When grounding electrode conductors are installed, they must be one continuous length without a joint or splice except that splicing of the wire-type grounding electrode conductor is allowed by__ or by irreversible compression-type connectors that are indicated for use as grounding and bonding equipment.
The exothermic welding process
250.64(C)
134
What is the maximum size for a copper grounding electrode conductor attached to the concrete-encased steel reinforcing bars used as grounding electrode, when the ungrounded service-entrance conductors for a residence are size 3/0 AWG copper conductors?
4 AWG
250.66(B)
135
All metal parts of all service enclosures that are normally noncurrent-carrying must effectively be:
Bonded together
250.92(A)
136
To ensure__ and the capacity to conduct safely any fault current likely to be imposed on them, all metal raceways, cable armor, cable sheath, cable trays, enclosures, fittings, frames and other metal concurrent-carrying parts meant to be equipment grounding conductors shall be bonded.
Electrical Continuity
250.96(A)
137
A bonding jumper must be a __ or similarly suitable conductor, made of copper or other corrosion-resistant material.
Bus, screw, or wire
250.102(A)
138
Equipment such as control, fire alarm, and signaling circuits that are supplied by Class 1 circuits must be grounded unless operating under:
50 Volts
250.112(I)
139
True or False: When a mineral-insulated, metal sheathed cable has a copper sheath, it may be used as the equipment grounding conductor.
True
250.118
140
Equipment grounding conductors are allowed to be bare, covered, or__, unless required elsewhere in the code. Exceptions ignored.
Insulated
250.119
141
Where a metal box is mounted on the surface, direct metal-to-metal contact between the device yoke and the box shall be permitted to__ the receptacle to the box.
Ground
250.146(A)
142
All conductors of the same circuit and, where used, the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same__.
Raceway
300.3(B)
143
Requirements for each portion of a paralleled installation for circuit conductors must be applied separately for each:
Raceway, auxiliary gutter, cable tray, trench, cable, or cord
300.3(B)(1)
144
Where a cable- or raceway-type wiring method is installed through bored holes joists, rafters, or wood members, holes shall be bored so that the edge of the hole is not less than__ inches from the nearest edge of the wood member.
1.25 Inches (32MM)
300.4(A)(1)
145
What is the minimum clearance that must be maintained between electrical metallic tubing(EMT) and the surface of the roof decking when it is installed under metal-corrugated sheet roof decking?
1.5 Inches (34MM)
300.4(E)
146
What should NOT be provided as protection for a conductor of a size 4 AWG or larger entering a panelboard?
A bushing made of insulating material.
300.4(G)
147
What is the minimum cover for rigid metal conduit that is directly buried outdoors?
6 Inches
300.5(A)
Table 300.5(A)
148
Under alleys, driveways, highways, parking lots, roads, and streets, what is the minimum cover requirement in inches, for the underground wiring up to 600 volts, in Type UF Cable?
24 Inches
300.5(A)
Table 300.5(A)
149
What is the minimum cover requirement, in inches, for underground wiring up to 600 volts, in rigid metal conduit under a building?
0
300.5(A)
Table 300.5(A)
150
Under alleys, driveways, highways, parking lots, roads, and streets, what is the minimum burial depth in inches for wiring intermediate metal conduit or rigid metal conduit?
24 Inches
300.5(A)
Table 300.5(A)
151
Underground service conductors that are not encased in concrete and that are buried 18 inches or more below grade shall have their location identified by a warning ribbon that is placed in the trench at least __ inches above the underground installation.
12 Inches
300.5(D)
152
When conduit or raceways may have moisture contacting live parts, they must be:
Sealed or plugged at either or both ends
300.5(G)
153
At least__ inches of free conductor shall be left at each outlet, junction, and switch point for splices or the connections of luminaires(fixtures) or devices.
6 Inches(150MM)
300.14
154
The number and size of conductors in any raceway shall not be be more than will permit dissipation of the __ and ready installation or withdrawal of the conductors without damage to the conductors or to their insulation.
Heat
300.17
155
The NEC requires that all ungrounded and grounded conductors of a common circuit be grouped together in the same ferrous metal raceway to reduce:
Inductive Heat
300.20(A)
156
Aluminum, copper-clad aluminum, or copper conductors, for each ungrounded conductor, grounded conductor, or neutral conductor shall be permitted to be connected in parallel only in sizes __ AWG and larger.
1/0
310.10(G)
157
In an existing raceway, what is the largest size insulated solid conductor that the NEC allows to be pulled?
10 AWG
310.3(C)
158
If a conductor for general wiring is not specifically allowed to be covered or bare, it must be:
Insulated
310.3(D)
159
When noncombustible surfaces are incomplete or broken, they must be repaired so that any gaps or open spaces are__ in. or less at the edge of the cabinet or cutout box with a flush-type cover.
1/8 Inch(3MM)
312.4
160
All metal boxes shall be__ or bonded.
Grounded
314.4
161
In damp or wet locations,__ drainage openings between 1/8 in. and 1/4 in. are allowed to be installed in the field in boxes or conduit bodies listed for such use.
Approved
314.15
162
The volume allowance required for each 14 AWG conductor, when calculating box fill, shall be__ cubic inches.
2 Cubic Inches
314.16
163
For a 4" square box X 2-1/8" deep, with 12 AWG copper conductors, what is the maximum fill allowance?
13
314.16
164
What is the maximum number of size 10 AWG conductors that may be added to a metal junction box with a volume of 24 cubic inches that contains a total of six(6) size 12 AWG conductors, and no grounding conductors, devices or fittings contained in the box?
Four
12 AWG=2.25 cu.in. x 6(existing wire in box)=13.5 cu.in.
24 cu. in. (allowable fill of box)
-13.5 cu. in.(existing wire in box)
10.5 cu. in.(remaining space available)
10 AWG=2.5 cu. in.
10.5 cu.in. / 2.5 cu. in. =4.2= 4 10 AWG conductors
165
How many conductors will be counted for a box that has one 14/3 with ground NM cable, one switch, and 2 internal cable clamps?
7 Conductors
1-14/3( 3, 14AWG conductors)
1 Ground(1, 14AWG conductor)
1 Switch(2, 14 AWG conductors)
2 Clamps(1, 14AWG conductor)
314.16(B)
166
What is the minimum volume, in inches, required of a two(2) gang device box that is to contain two(2) size 14/2AWG with ground NM cables and two(2) size 12/2AWG with ground NM cables connected to a duplex receptacle connected to a single pole switch, which also contain four(4) cable clamps?
30 Cubic Inches
314.16(B)
167
When a conductor originates outside of a box, and is spliced or terminates inside the box, it will be counted once, and each conductor that goes through the box without a splice or termination:
Shall be counted once
314.16(B)(1)
168
Based on the largest conductor connected to the switch, for the purpose of determining conductor fill in a device box, how many conductor(s) is a three-way switch counted as equal to?
Two
314.16(B)(4)
169
In walls or ceilings with a surface of noncombustible material, boxes shall be installed so that the front edge of the box will not be set back of the finished surface more than__ inch.
1/4 Inch
314.20
170
Each outlet box in a completed installation must have a:
Cover, faceplate, or canopy
314.25
171
If a luminaire weighs more than__, unless the outlet box is listed for the weight to be supported, it must be supported independently of the outlet box.
50 Pounds
314.27(A)(1)
172
If an outlet box is designed to support ceiling-suspended (paddle) fans weighing more than__, then the maximum weight to be supported shall be included in the required marking.
35 Pounds
314.27(C)
173
The length of a pull box containing conductors of size 4AWG and larger shall not be less than__ times the trade diameter of the largest conduit entering the box when a straight pull of the conductors is to be made.
Eight
314.28(A)(1)
174
What is the minimum distance for a trade size 3 raceway entry (250kcmil) on the wall opposite a removable cover?
4.5 Inches
314.28(A)(2)
Table 312.6(A)
175
Type MC cable shall be supported and secured at intervals not exceeding__ feet.
6 Feet(1.8M)
330.30(B)
176
Type MC cable containing four or fewer conductors, sized no larger than 10 AWG, shall be secured within__ inches of every box, cabinet, fitting, or other cable termination.
12 Inches (300MM)
330.30(B)
177
The tightest bend allowed by the NEC for Type NM cable is a radius of how many times the diameter of the cable?
Five
334.24
178
Staples, cable ties, straps, hangers or similar fittings shall secure nonmetallic-sheathed cable at intervals not exceeding:
4.5 Feet(1.4M)
334.30
179
Nonmetallic-sheathed cable shall be secured by staples, cable ties, straps, hangers or similar fittings within__ inches of every cabinet, box, or fitting.
12 Inches(300MM)
334.30
180
Intermediate metal conduit(IMC) is required to be fastened within what minimum distance from an outlet box, junction box, device box, cabinet, conduit body, or other conduit termination?
3 Feet(900MM)
342.30(A)
181
Rigid Metal Conduit(RMC) fastening may be increased to__ if structural members do not readily permit fastening within 3 ft.
5 Feet(1.5M)
344.30(A)
182
Where is FMC not permitted?
348.12 Uses Not Permitted
183
The cut ends of any conduit must be __ both inside and outside to eliminate any rough edges.
Trimmed
350.28
184
LFMC must be secured and supported at intervals of__ ft. or less. Exceptions ignored.
4.5 Feet(1.4M)
350.30(A)
185
LFMC must be fastened in place securely by an approved means__ or less of each box, cabinet, conduit body, or other conduit termination. Exceptions ignored.
12 Inches(300MM)
350.30(A)
186
What is the maximum distance between supports for standard trade size 2 inch Schedule 40 PVC?
5 Feet
352.30(B)
Table 352.30(B)
187
EMT smaller than__ inch shall not be used.
1/2 Inch
358.20(A)
188
What is the maximum number of 90 degree bends in electrical metallic tubing(EMT), between boxes and or pull points?
Four(360 Degrees)
358.24(B)
189
EMT shall be securely fastened in place at least every__ feet.
10 Feet(3.0M)
358.30(A)
190
Electrical metallic tubing(EMT) shall be fastened securely within what distance of each outlet box, junction box, device box, cabinet, conduit body, or other tubing termination?
3 Feet(900MM)
358.30(A)
191
EMT shall be permitted as an equipment __ conductor.
Grounding
358.60
192
The sum of the cross sectional areas of all contained conductors at any cross section of a sheet metal auxiliary gutter shall not exceed__ percent of the interior cross sectional area of the sheet metal auxiliary gutter.
20%
366.22(A)
193
Auxiliary gutters made of sheet metal must be secured and supported at intervals of__ ft. or less along entire length.
5 Feet(1.5M)
366.30(A)
194
Conductors, including splices and taps, shall not fill gutters to more than__ percent of its area.
75%
366.56(A)
195
Lengths of busway are allowed to extend through__ if they are unbroken.
Dry walls
368.10(C)(1)
196
Where may flexible cords and cables NOT be used?
When run through holes in walls
400.12
197
A No. 14 fixture wire has an allowable ampacity of:
17 Amperes
Table 402.5
198
Fixture wires shall not be smaller than__ AWG.
18 AWG
402.6
199
Circuit breakers used as switches, and switches, must be in a location so that they can be operated from a readily accessible place, and must be placed so that when the center of the grip of the operating handle of the circuit breaker or switch is in its highest position, it is ___ or less above the working platform or floor. Exceptions ignored.
6 Feet 7 Inches(2.0M)
404.8(A)
200
Three-way and four-way switches shall be so wired that all switching is done:
Only in the ungrounded circuit conductor.
404.2(A)
201
Snap switches must not be ganged or grouped in enclosures with other receptacles, snap switches, or similar devices, unless they are placed so that voltage is __ volts or less between adjacent devices, or unless placed in enclosures with securely installed, identified barriers between adjacent devices.
300 Volts
404.8(A)
202
General use dimmer switches shall be used only to control permanently installed__ luminaires(lighting fixtures).
Incandescent
404.14(F)
203
What marking must be on receptacles rated for up to 20 amperes and designed for directly connecting aluminum conductors?
CO/ALR
406.3(C)
204
Receptacles incorporating an isolated grounding conductor connection shall be identified by an__ triangle located on the face of the receptacle.
Orange
406.3(D)
205
Receptacles installed on 15- and 20- ampere branch circuits shall be of the __ type.
Grounding
406.4(A)
206
Receptacles installed outdoors in a wet location shall have an enclosure what is __ whether or not attachment plug cap is inserted.
Weatherproof
406.9(B)(1)
207
Where conduits enter a switchboard or floor standing panelboard at the bottom, the conduit including their end fittings, shall not rise more than__ inches above the bottom of the enclosure.
3 Inches (75MM)
408.5
208
Each grounded conductor shall terminate within the panelboard in an__ terminal that is not also used for another conductor.
Individual
408.41
209
The clear zone distance from the top of a bathtub rim or a shower stall threshold must be at least __ ft. horizontally for any parts of chain, cable or cord-suspended luminaires, lighting track, pendant, or ceiling-suspended(paddle) fans.
3 Feet(900MM)
410.10(D)
210
The clear zone distance from the top of a bathtub rim or a shower stall threshold must be at least __ ft. vertically for any parts of chain, cable or cord-suspended luminaires, lighting track, pendant, or ceiling-suspended(paddle) fans.
8 Feet(2.5M)
410.10(D)
211
Surface mounted incandescent luminaires installed on the wall above the door on on the ceiling in clothes closets shall have a minimum clearance of__ inches between the luminaire and the nearest point of storage.
12 Inches(300MM)
410.16(D)
212
What is the minimum clearance required between a surface mounted incandescent luminaire installed above the door or on the ceiling of a clothes closet, and the nearest shelf?
12 Inches (300MM)
410.16(C)
213
For a metal pole over 8 ft. tall, what is the minimum size for the handhole?
2 in x 4 in(50MM x 100MM)
410.30(B)
214
What is the minimum temperature rating for branch circuit conductors installed inside a ballast enclosure of a luminaire that is within three (3) inches of the ballast?
90 Degrees C (194 F)
410.68
215
Screw shell type lampholders must be installed to be used as lampholders only, and where the supply circuit has a grounded conductor, the grounded conductor must be attached to the:
Screw shell
410.90
216
Thermal insulation shall not be installed above a recessed luminaire or within__ inches of the recessed luminaires enclosure, wiring compartment, or ballast unless it is identified for contact with insulation, Type IC.
3 Inches(75MM)
410.116(B)
217
Lighting systems for fountains, pools, spas, and similar locations must be installed__ or more horizontally from the nearest water's edge, unless Article 680 permits otherwise.
10 Feet(3.0M)
411.6(B)
218
What is the maximum standard size overcurrent protection device to protect an installed 40 gallon electric water heater with a nameplate rating of 4500 watts at 240 volts, single phase?
30 Amperes
I=P/E
4500VA/240V=18.75A x 150%=28.1A
422.11(E)
219
The length of cord for electrically operated kitchen waste disposers shall not be less than_ inches.
18 Inches (450MM)
422.16(B)(1)
220
The length of cord for electrically operated kitchen waste disposers shall not be over__ inches.
36 Inches(900MM)
422.16(B)(1)
221
A cord and plug connected dishwasher installed under the counter in a dwelling unit has a maximum allowed cord length of:
6.5 Feet(2.0M)
422.16(B)(2)
222
Ceiling suspended(paddle) fans shall be supported__ of the outlet box.
Independently
422.18
223
Circuit breakers and switches to be used as a means of disconnection must be the __ type.
Indicating
424.21
224
Which of the following is a requirement for electrically heated floors in bathrooms, kitchens, and in hydromassage bathtub locations?
GFCI Protected
424.44(E)
225
Fixed outdoor electric deicing and snow melting equipment shall be considered as a __ load.
Continuous
426.4
226
The motor nameplate current rating on a motor used in a continuous-duty application is used to determine the requirement of the motor for:
Motor overload protection
430.6(A)
227
What table is used for current values to determine the required ampacity of the branch circuit conductors to supply a 3-phase, continuous ac motor?
Table 430.250
430.6(A)(1)
228
What is the minimum ampacity of the branch circuit conductors used to supply a 7.5 HP, 240 volt, single phase induction type, ac motor for continuous duty application?
50 Amperes
FLC of 7.5 HP Motor= 40A x 125%=50A
430.22
228
What does a motor overload device function in a direct response to?
Motor Current
430.32(A)(1)
229
What is the minimum overload protective device for a 2 HP, 115 volt motor with a nameplate rating of 21.5A and a full-load current rating of 24A?
24.70A
430.32(A)(1)
230
The disconnecting means for motor circuits rated 1000 volts, nominal, or less shall have an ampere rating of at least __ percent of the full-load current rating of the motor.
115%
430.110(A)
231
Flexible metal conduit or liquidtight flexible metal conduit not exceeding__ feet in length shall be permitted to be employed for raceway connection to a motor terminal enclosure.
6 Feet
430.203
232
Disconnecting means shall be located within __ from and readily accessible from air conditioning or refrigerating equipment.
Sight
440.14
233
The total marked rating of a cord and attachment plug connected room air conditioner shall not exceed __ percent of the rating of a branch circuit where no other loads are supplied.
80%
440.26(B)
234
For a branch circuit where lighting outlets or general use receptacles are also supplied, what is the maximum percentage of the rating that may not exceed by a cord-and-attachment-plug-connected air conditioner?
50%
440.62(C)
235
Which class of hazardous locations are the ones with combustible liquid-produced vapors, flammable gases, or flammable liquid-produced vapors that may be present in the air in sufficient quantities to be an ignitable or explosive mixture?
Class 1
500.5(B)
236
What is present at a Class II locations that makes the hazardous?
Combustible dust
500.5(C)
237
Which Class locations is hazardous because of the presence of materials producing combustible flyings, or having easily ignitable fibers present, but where they are not expected to be in sufficient quantities to create an ignitable mixture?
Class 3
500.5(D)(1)
238
Attachment plugs for Class 1 locations must be the type providing__ of a permitted flexible cord.
Connection to the equipment grounding conductor
501.145(B)
239
What is one of the methods to provide an effective ground-fault current path for branch circuits serving patient care spaces?
Metal raceway system
517.13
240
True or False: Receptacles in health care facilities that have isolated grounding terminals as described in 250.146(D) are allowed in the vicinity of patient care areas.
False
517.16(A)
241
What is the minimum number of hospital grade receptacles required for each patient bed location in general care areas of hospitals, disregarding exceptions?
Eight(8)
517.18(B)
242
Essential electrical systems for hospitals are comprised of which branches?
The life safety, equipment, and the critical
517.31(A)
243
What is the minimum rating allowed for 120/240 volt, single phase service equipment for a mobile home?
100 Amperes
550.32(C)
244
What is the minimum rating for a single receptacle shore power for boats?
30 Amperes
555.33(A)(4)
245
Temporary electric power and lighting installations for holiday decorative lighting and similar purposes is allowed for a maximum:
90 Days
590.3(B)
246
On construction sites, receptacles must not be installed on the same__ as temporary lighting.
Branch Circuit
590.4(D)(1)
247
For each commercial building and occupancy that is accessible to pedestrians, there must be at least one outlet provided in an accessible location at the __ to every tenant space, for the use of an outline or sign lighting system.
Entrance
600.5(A)
248
True or False: It is permissible to use a metal pole supporting a sign cabinet or sign system to enclose the supply conductors.
True
600.5(D)(3)
249
The disconnecting means for electric signs or outline lighting systems must be visible and __ of any part of the sign display.
Within Sight
600.6(A)(2)
250
Electric signs and outline lighting systems must be __ or more above areas accessible to vehicle unless protected from physical damage.
14 Feet(4.3M)
600.9(A)
251
Where branch circuit conductors supply one or more units of information technology equipment, they must have an ampacity of at least__ percent of the total load that is connected.
125%
645.5(A)
252
Unless it is necessary to supply pool equipment, underground wiring is now allowed under a pool or in an area less than__ ft. horizontally from the inside wall of the pool.
5 Feet(1.5M)
680.11(A)
253
Receptacles providing power for water pump motors and other loads directly related to water circulation and sanitation of a pool must be 6 FT. or more from the inside walls, and:
Have GFCI protection and be of the grounding type
680.22(A)(2)
254
Receptacle providing power for swimming pool recirculating pump motors must be GFCI protected, grounded, and must be at least how far from the inside walls of the pool?
6 Feet (1.83M)
680.22(A)(2)
255
Generally, receptacles are required to be__ ft. or more from the inside walls of a pool.
6 Feet (1.83M)
680.22(A)(3)
256
Switching devices must be __ ft. or more horizontally from the inside walls of a pool unless they are separated by a solid fence, wall, or another permanent barrier. A switch listed as being acceptable for use inside this distance is allowed.
5 Feet(1.5M)
680.22(C)
257
For wet-niche underwater pool luminaires, which conduit is allowed to enclose the conductors?
Rigid Metal, Intermediate Metal, Liquidtight flexible nonmetallic, or rigid nonmetalic
680.23(B)(2)
258
What is the smallest size grounding conductor allowed for grounding the structural reinforcing steel of a swimming pool?
8 AWG
680.26(B)
259
If an equipotential bonding grid is required to be installed in the deck around a permanently installed swimming pool what is the minimum horizontal distance for it to be beyond the inside walls of the pool?
3 Feet(1M)
680.26(B)(2)
260
From the inside walls of an indoor installed spa or hot tub to the wall switches, what is the minimum distance?
5 Feet(1.5M)
680.43(C)
261
For a fixed or stationary electric sign installed in a fountain, the disconnecting means must be at least how far horizontally from the inside wall of the fountain?
5 Feet(1.5M)
680.57(C)(1)
262
What is the minimum percentage of the maximum current rating for PV system overcurrent devices, as calculated in 690.8(A)?
125%
690.9(B)
263
True or False: PV systems disconnecting means are required to be plainly labeled "PV SYSTEM DISCONNECT" or something similar:
True
690.13(B)
264
All grounded DC PV arrays shall have direct-current__ provided to reduce fire hazards, and such must meet the requirements of 690.5(a) through (c).
Ground-fault protection
690.41(B)
265
The emergency power source must be suitable rated with enough capacity to supply and maintain the total load for at least:
2 hours
700.12(C)
266
Class 1 circuits must be identified at terminal and junction locations in a way that prevents __ with other circuits.
Unintentional interference
724.30
267
True or False: Class 1 circuits may be installed with conductors for light, power, fire alarms, and broadband communications circuits.
True
724.48(B)(1)
268
The NEC allows Class 1 control-circuit conductors and motor branch circuits to use the same raceway, as long as the control circuit conductors.
Are functionally associated with the motor system
724.48(B)(1)
269
When can conductors of Class 2 and Class 3 circuits be placed in the same cable, enclosure, raceway or similar fitting as electric light or power conductors or conductors of Class 1 circuits?
Separated by a barrier
725.136(B)
270
True or False: Class 2 and Class 3 conductors must be copper:
True
725.144
271
True or False: If fire alarm cable is abandoned, the accessible portions must be removed.
True
760.25
272
Fire alarm circuits must be identified at all junction and terminal locations so that prevention of unintentional signals on the fire alarm system circuits during:
Testing and servicing of other systems
760.30
273
True or False: It is permissible to attach, strap, or tape power limited fire alarm cables to the exterior of a conduit or raceway.
False
760.143
274
What is the minimum separation for overhead communications wires and cables at any point in the span from supply service drops of up to 750 volts?
12 Inches(300MM)
800.44(A)(4)
275
What is the minimum clearance for communications wires and cables above all points of roofs above which they pass?
8 Feet(2.5M)
800.44(B)
276
Unless otherwise permitted, communications cables and wires must be separated at least 2 in. from which circuit conductors?
Power, lighting, or Class 1
800.133(B)
277
How far must the separation be between any light, power, or Class 1 conductors or radio and television conductors, and underground antenna conductors for radio and television receiving equipment?
12 Inches(300MM)
810.18(A)
278
A bonding jumper not smaller than__ AWG copper or equivalent must be connected between the radio and television equipment grounding electrode and the power grounding electrode system when they are separate.
6 AWG
810.21(J)
279
True or False: Unpowered equipment and enclosures or equipment powered by coaxial cable is considered ungrounded even when connected to the metallic cable shield
False
820.103
280
What is the maximum cross sectional value that conduit nipples under 24 inches long may be filled?
60%
Chapter 9 Table Notes to Tables
310.15(C)(1)
281
If more than 2 conductors are used in a tube of EMT conduit, the total interior area that can be filled is no more than__ percent.
40%
Chapter 9 Table Notes to Tables(Table 4)
282
What is the minimum allowable trade size intermediate metal conduit(IMC) required to contain a total of ten(10) copper THW conductors in a 20 foot run, five(5) size 1 AWG and five(5) size 3 AWG?
2.5 Inches
Size 1 AWG THW= .1901 sq. in. x 5= .9505 sq. in.
Size 3 AWG THW= .1134 sq. in. x 5= .537 sq. in.
Total=1.5175 sq. in.
Note* Trade size 2.5 in. IMC with an allowable 40% fill of 2.054 sq. in. should be selected.
283
Given the following information, what is the maximum approximate distance a single phase, 240 volt, 42 ampere load can be located from a panelboard?
*Copper Conductors- K=12.9
*Size 8 AWG THWN/THHN conductors are used
*Limit voltage drop to 3%
109 Feet
VD= 240V x 3%= 7.2V
CM x VD/ 2 x K x I
D= 16510 x 7.2 / 2 x 12.9 x 42= 118,872 / 1083.6 = 109.7 Feet
Chapter 9 Tables Table 8 Conductor Properties
284
Where K=12.9, what is the approximate voltage drop on a circuit where an 80 ampere, 240 volt, single phase load is supplied with size 3 AWG copper conductors with THWN insulation, and placed to 200 feet from a panelboard?
7.84 Volts
VD=2 x K x I x D/ CM
VD= 2x 12.9 x 80A x 200 ft. / 52,620 CM = 7.84 Volts
285
What does the abbreviation A.F.F represent?
Above finished floor
286
The abbreviation TYP represents:
Typical
