325 Practice Questions for Electricians
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Question 1 of 325
1. Question
Disregarding exceptions, FMC shall be securely fastened in place by an approved means within __________ of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed ___________. Where used, cable ties shall be listed and be identified for securement and support.
CorrectIncorrect -
Question 2 of 325
2. Question
Electric currents cause __________, which creates light in incandescent light bulbs. They also create magnetic fields, which are used in motors, inductors, and generators.
CorrectIncorrect -
Question 3 of 325
3. Question
At all points where the armor of __________ terminates, a fitting shall be provided to protect wires from abrasion, unless the design of the outlet boxes or fittings is such as to afford equal protection, and in addition, an insulating bushing or its equivalent protection shall be provided between the conductors and the armor?
CorrectIncorrect -
Question 4 of 325
4. Question
The minimum size service conductors (AL) for a 150 Amp service in a single-family dwelling unit is __________.
CorrectIncorrect -
Question 5 of 325
5. Question
Where Compressed Natural Gas or Liquefied Natural Gas dispensers are installed beneath a canopy or enclosure, either the canopy or enclosure shall be designed to prevent accumulation or entrapment of ignitable vapors or all electrical equipment installed beneath the canopy or enclosure shall be suitable for __________.
CorrectIncorrect -
Question 6 of 325
6. Question
The use of strut-type channel raceways shall not be permitted in which of the following:
CorrectIncorrect -
Question 7 of 325
7. Question
In a(n) __________ system, electrical equipment, wiring, and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit from any point on the wiring system to the electrical supply source to facilitate the operation of overcurrent devices should a second ground fault from a different phase occur on the wiring system.
CorrectIncorrect -
Question 8 of 325
8. Question
An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure is:
CorrectIncorrect -
Question 9 of 325
9. Question
FMC shall not be used in the following:
CorrectIncorrect -
Question 10 of 325
10. Question
For a storage warehouse, what portion of the lighting load does a 50% demand factor apply to?
CorrectIncorrect -
Question 11 of 325
11. Question
The conductor between the surge arrester and the line and the surge arrester and the grounding connection, on a 2,000-volt service, shall not be smaller than __________.
CorrectIncorrect -
Question 12 of 325
12. Question
A pool has a diving platform that extends 4 feet above the surface of the water. There is a set of 3 overhead conductors supported on a Solidly Grounded Messenger wire that run over the pool, and over the diving platform. What is the minimum clearance these conductors must be from the diving platform?
CorrectIncorrect -
Question 13 of 325
13. Question
If the output of a 10hp 120-volt DC motor is 7,460 Watts and the input is 9,120 Watts, what is the efficiency of the motor?
CorrectIncorrect -
Question 14 of 325
14. Question
Type MV cable terminated in equipment or installed in pull boxes or vaults shall be secured and supported by metallic or nonmetallic supports suitable to withstand the weight by cable ties listed and identified for securement and support, or other approved means, at intervals not exceeding __________ from terminations or a maximum of __________ between supports.
CorrectIncorrect -
Question 15 of 325
15. Question
In straight pulls, the length of the box or conduit body shall not be less than __________ the metric designator (trade size) of the largest raceway.
CorrectIncorrect -
Question 16 of 325
16. Question
The voltage of an AC circuit can be increased or decreased but the frequency cannot be changed.
CorrectIncorrect -
Question 17 of 325
17. Question
A single-family dwelling out in the country has a floor area of 1500 square feet, with no garage. Appliances are a 10-kW range and a 6-kW, 240-volt dryer. There are no heating or air conditioning loads, nor a dishwasher or garbage disposal. Using the Standard Method, calculate the minimum size feeder required for this dwelling.
CorrectIncorrect -
Question 18 of 325
18. Question
The minimum size service conductors for a 200 Amp service in a single-family dwelling unit is__________.
CorrectIncorrect -
Question 19 of 325
19. Question
In a Commercial Garage, all 125-volt, single-phase, 15- and 20-ampere receptacles installed in areas where electrical diagnostic equipment, electrical hand tools, or portable lighting equipment are to be used shall have __________.
CorrectIncorrect -
Question 20 of 325
20. Question
All 15- and 20- ampere, 125- and 250-volt nonlocking-type receptacle shall be listed tamper-resistant receptacles, except in which of the following instances:
CorrectIncorrect -
Question 21 of 325
21. Question
The earth shall be considered as an effective fault-current path.
CorrectIncorrect -
Question 22 of 325
22. Question
A grounded circuit conductor shall not be used for grounding non-current-carrying metal parts of equipment on the load side of the service disconnecting means or on the load side of a separately derived system disconnecting means or the overcurrent devices for a separately derived system not having a main disconnecting means, except for which of the following:
CorrectIncorrect -
Question 23 of 325
23. Question
Ceiling outlets shall be required to support a luminaire weighing a minimum of __________. A luminaire that weighs more than __________shall be supported independently of the outlet box, unless the outlet box is listed for not less than the weight to be supported.
CorrectIncorrect -
Question 24 of 325
24. Question
At a Highschool, the general lighting load shall be calculated at __________ VA per square foot.
CorrectIncorrect -
Question 25 of 325
25. Question
The largest number of 4 AWG THW conductors that can be installed an 18-inch piece of 1 1/4″ Liquidtight Flexible Nonmetallic Conduit shall be:
CorrectIncorrect -
Question 26 of 325
26. Question
Lamps located in cellulose nitrate film vaults shall be installed in rigid luminaires of the __________ type.
CorrectIncorrect -
Question 27 of 325
27. Question
Calculate the total service size for the following residence, using the STANDARD METHOD:
- 1500 square foot home
- trash compactor 1100VA
- range 6000VA
- dryer 4000VA
- 2 ovens (3kVA each)
- disposal 940VA
- water heater 4500VA
- dishwasher 1250VA
- AC 6440VA
- Heat 9000VA
- Lighting = 4500VA
- Laundry = 1500VA
- Small Appliance = 3000VA
CorrectIncorrect -
Question 28 of 325
28. Question
Equipotential planes of agricultural buildings shall be connected to the electrical grounding system. The bonding conductor shall be solid copper, insulated, covered or bare, and not smaller than __________. The means of bonding to wire mesh or conductive elements shall be by pressure connectors or clamps of brass, copper, copper alloy, or an equally substantial approved means. Slatted floors that are supported by structures that are a part of an equipotential plane shall not require bonding.
CorrectIncorrect -
Question 29 of 325
29. Question
Conductors that are capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building is said to be ____________.
CorrectIncorrect -
Question 30 of 325
30. Question
The electrons in the outer shell of an atom are called __________.
CorrectIncorrect -
Question 31 of 325
31. Question
In a 1-phase 240/120-volt service feeding a Single-Family Dwelling rated 100- through 400- amperes, the service conductors supplying the entire load associated with a one-family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than __________.
CorrectIncorrect -
Question 32 of 325
32. Question
The fixed appliance load for a single-family dwelling with the following 120V fixed in place appliances is __________:
- Water Heater- 8000 VA
- Dishwasher- 1600 VA
- Garbage Disposal- 1000VA
CorrectIncorrect -
Question 33 of 325
33. Question
For motors used in alternating-current, adjustable voltage, variable torque drive systems, the ampacity of conductors, or ampere ratings of switches, branch-circuit short-circuit and ground-fault protection, and so forth, shall be based on ___________.
CorrectIncorrect -
Question 34 of 325
34. Question
Luminaires shall be constructed, installed, or equipped with shades or guards so that combustible material is not subjected to temperatures in excess of __________.
CorrectIncorrect -
Question 35 of 325
35. Question
All pull boxes, junction boxes, and conduit bodies shall be provided with covers compatible with the box or conduit body construction and suitable for the conditions of use. Where used, metal covers shall:
CorrectIncorrect -
Question 36 of 325
36. Question
Luminaires shall be constructed, installed, or equipped with shades or guards so that combustible material is not subjected to temperatures in excess of:
CorrectIncorrect -
Question 37 of 325
37. Question
A 100x54mm (4×2 1/8”) metal square box, having a minimum volume of 30.3 cubic inches, shall be allowed to have no more than __________ 12 AWG conductors in it.
CorrectIncorrect -
Question 38 of 325
38. Question
What is the monthly cost of operating a 240-volt, 5-kW central electric heater that operates 12 hours per day when the cost is 15 cents per kWhr (kilowatt-hour)?
CorrectIncorrect -
Question 39 of 325
39. Question
Disregarding exceptions, any portion of electrical wiring that is below the surface of a Class I, Division 1 or a Class I, Division 2 location shall be sealed within __________ of the point of emergence above grade.
CorrectIncorrect -
Question 40 of 325
40. Question
Determine the demand load of the service-entrance conductors for a restaurant kitchen that contains the following cooking equipment (after applying permitted demand factors):
- (1) 14 kW range
- (1) 5 kW water heater
- (1) 750 W mixer
- (1) 2500 W dishwasher
- (1) 2 kW booster heater
- (1) 2 kW broiler
CorrectIncorrect -
Question 41 of 325
41. Question
What is the feeder/service neutral calculated load for the following service:
- 200 amp Line to Line loads
- 200 amp Line to Neutral Nonlinear Loads
- 200 amp Line to Neutral Linear Loads
CorrectIncorrect -
Question 42 of 325
42. Question
In a multi-family dwelling which of these 120-volt, single-phase, 15- and 20-ampere branch circuits shall be protected with an arc-fault circuit-interrupter?
CorrectIncorrect -
Question 43 of 325
43. Question
The distance outward that an expanding and collapsing electromagnetic field around a conductor can reach, is __________.
CorrectIncorrect -
Question 44 of 325
44. Question
The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors – is defined as what?
CorrectIncorrect -
Question 45 of 325
45. Question
The fixed appliance load for a single-family dwelling unit with a 950 VA Garbage Disposal, a 1200 VA Dishwasher and a Water Heater rated at 7500VA, all rated at 120V is __________.
CorrectIncorrect -
Question 46 of 325
46. Question
In an Ungrounded 240-volt 3-phase system, an equipment grounding conductor shall be installed with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode(s). The grounding electrode(s) shall also be connected to __________.
CorrectIncorrect -
Question 47 of 325
47. Question
Luminaires shall be constructed, installed or equipped with shades or guards so that combustible material is not subjected to temperatures in excess of ____________.
CorrectIncorrect -
Question 48 of 325
48. Question
Receptacles shall be mounted in identified boxes or assemblies. The boxes or assemblies shall be securely fastened in place unless otherwise permitted elsewhere in this code. Screws for the purpose of attaching receptacles to a box shall be of the type provided with a listed receptacle, or shall be machine screws having __________ threads per inch:
CorrectIncorrect -
Question 49 of 325
49. Question
The ampacity of UF cable shall be that of:
CorrectIncorrect -
Question 50 of 325
50. Question
A branch-circuit overcurrent protective device is a device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of over-currents between its __________ and its __________.
CorrectIncorrect -
Question 51 of 325
51. Question
Electrical wiring for lighting, where installed inside of tents and concessions, shall be securely installed and, where subject to physical damage, shall be provided with __________.
CorrectIncorrect -
Question 52 of 325
52. Question
Determine the motor overload protection for three induction-type motors on a 480-V, 3-phase feeder, as follows:
(a) One 25-hp, 460-V, 3-phase, squirrel-cage motor, nameplate full-load current 32 A, Design B, Service Factor 1.15
(b) Two 30-hp, 460-V, 3-phase, wound-rotor motors, nameplate primary full-load current 38 A, nameplate secondary full-load current 65 A, 40°C rise.
CorrectIncorrect -
Question 53 of 325
53. Question
In instances of areas within the same facility classified separately, Class I, Zone 2 locations shall be permitted to __________ Class I, Division 2 locations.
CorrectIncorrect -
Question 54 of 325
54. Question
Two 75kVA 208/480V transformers are installed in parallel and protected by a common overcurrent protection device, on the primary side only. What size should this primary OCPD be to protect this transformer bank?
CorrectIncorrect -
Question 55 of 325
55. Question
What is the minimum allowable ampacity of THWN copper conductors run to a three-phase continuous load that is rated 250-volts, 50-amperes which is located 50-feet from its overcurrent device? The conductors are inside of a piece of 1-inch EMT, the ambient temperature of the environment is 84-degrees Fahrenheit, and there are 3 current-carrying conductors in the raceway.
CorrectIncorrect -
Question 56 of 325
56. Question
The amount of EMF surrounding a conductor __________ with a(n) __________ in current flow through the conductor.
CorrectIncorrect -
Question 57 of 325
57. Question
An incandescent lamp for general use on lighting branch circuits shall not be equipped with a medium base if rating over __________, or with a mogul base if rated over __________.
CorrectIncorrect -
Question 58 of 325
58. Question
The demand load for a dryer in a single-family dwelling unit, rated at 6,000 VA is __________.
CorrectIncorrect -
Question 59 of 325
59. Question
Where heating equipment is supplied by more than one source, feeder, or branch circuit, the disconnecting means shall be __________. Each disconnecting means shall simultaneously disconnect all ungrounded conductors that it controls.
CorrectIncorrect -
Question 60 of 325
60. Question
In a dwelling unit, the clearance for overhead service conductors, not in excess of 600 volts, measured at the driveway is __________ minimum from final grade.
CorrectIncorrect -
Question 61 of 325
61. Question
A receptacle outlet shall be installed at each countertop and work surface that is __________ or wider.
CorrectIncorrect -
Question 62 of 325
62. Question
The supply-side bonding jumper for a 240-volt single-phase service fed with (2) 300kcmil Aluminum ungrounded conductors should be what size:
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Question 63 of 325
63. Question
Select the feeders for a series of ranges being installed in a structure, based on the following loads:
- 5 ranges, each rated at 11 kW
- 2 ranges, each rated 12 kW
- 20 ranges, each rated 13.5 kW
- 3 ranges, each rated 18 kW
CorrectIncorrect -
Question 64 of 325
64. Question
A dead end of a busway shall be __________.
CorrectIncorrect -
Question 65 of 325
65. Question
What is the minimum size grounded conductor is required for a feeder consisting of (3) 250 kcmil ungrounded conductors and (1) grounded conductor protected by a 250-ampere OCPD? [The unbalanced load is 50-amperes, with 75 deg Celcius terminals]
CorrectIncorrect -
Question 66 of 325
66. Question
Fixed equipment that may produce arcs, sparks, or particles of hot metal, such as lamps and lampholders for fixed lighting, cutouts, switches, receptacles, motors, or other equipment having make-and-break or sliding contacts, shall be of the __________ or be constructed so as to prevent the escape of sparks or hot metal particles
CorrectIncorrect -
Question 67 of 325
67. Question
Restricted access, as it pertains to a Restricted Access Adjustable-Trip Circuit Breaker, shall be defined as located behind one of the following:
CorrectIncorrect -
Question 68 of 325
68. Question
The electric vehicle coupler shall be provided with a grounding pole, unless __________.
CorrectIncorrect -
Question 69 of 325
69. Question
A half-wave and full-wave rectifier are both used to __________.
CorrectIncorrect -
Question 70 of 325
70. Question
Copper conductors, for each phase, polarity, neutral, or grounded circuit shall be permitted to be connected in parallel (electrically joined at both ends) only in sizes __________ where installed in other than exempt control circuits.
CorrectIncorrect -
Question 71 of 325
71. Question
The demand load for the grounded conductor (neutral) for a 6,000 VA dryer is__________.
CorrectIncorrect -
Question 72 of 325
72. Question
A box containing pendant- or flush-mounted receptacles attached to a multiconductor cable via strain relief or a multipole connector is:
CorrectIncorrect -
Question 73 of 325
73. Question
Excluding exceptions, what is the smallest size of underground service conductors that can be utilized:
CorrectIncorrect -
Question 74 of 325
74. Question
When installing conductors in a rigid metal conduit that is buried under 3 inches of concrete, to what depth does this conduit need to be buried?
CorrectIncorrect -
Question 75 of 325
75. Question
For a one-family dwelling with a service rated 400-amps, the service conductors supplying the entire load associated with a one-family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than __________ of the service rating.
CorrectIncorrect -
Question 76 of 325
76. Question
What is the total demand load for the following restaurant:
A restaurant has all electric appliances, a connected lighting load that includes a sign, totaling 50,000VA. The electrical service is rated at 120/208-volt, three-phase. The restaurant contains the following loads:
120-volt loads
- 60 duplex receptacles
- 100 ft multi-outlet assembly (simultaneous rated)
- 1 broiler 5 kW
- 2 deep fryers 5.5 kW
- 1 freezer 3,400VA
- 1 booster heater 1,500VA
- 1 coffee service machine 3,500VA
- 1 dishwasher 3,500VA
208-volt loads
- 1 walk-in cooler 6,400VA
- 1 water heater 4,800VA
- 1 oven 20kW
- 1 range 15kW
- 2 convection ovens 8kW
- 15kW electric heater
- 14kW AC
- 3 exhaust fans 2.4 amperes
- 1 cooktop 10kW
- 2 10kW heating units
CorrectIncorrect -
Question 77 of 325
77. Question
The rating or setting of the overcurrent protective device for the circuit supplying the industrial control panel shall not be greater than the sum of the largest rating or setting of the branch-circuit short-circuit and ground-fault protective device provided with the industrial control panel, __________, plus the sum of the full-load currents of all other motors and apparatus that could be in operation at the same time.
CorrectIncorrect -
Question 78 of 325
78. Question
What is the feeder/service calculated load for (2) 15kW water heaters, (1) 3kW oven, and (1) 2kW deep fryer in a commercial kitchen?
CorrectIncorrect -
Question 79 of 325
79. Question
Up to __________ sets of 3-wire feeders or __________ sets of 4-wire or 5-wire feeders shall be permitted to utilize a common neutral.
CorrectIncorrect -
Question 80 of 325
80. Question
All raceways, cable trays, cable bus framework, auxiliary gutters or service cable armor or sheath that enclosed, contain or support service conductors shall be __________.
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Question 81 of 325
81. Question
Where used as service-entrance conductors, size 250 kcmil Type IGS cable has an allowable ampacity of __________.
CorrectIncorrect -
Question 82 of 325
82. Question
Impedance includes the following:
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Question 83 of 325
83. Question
Conductors that supply one or more welders shall be protected by an overcurrent device rated or set at not more than:
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Question 84 of 325
84. Question
What is the line demand load for a dryer with a nameplate rating of 4,800 VA.
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Question 85 of 325
85. Question
CorrectIncorrect -
Question 86 of 325
86. Question
For a single-family dwelling, the service disconnecting means shall have a rating of not less than __________.
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Question 87 of 325
87. Question
Raceways shall be used as a means of support for other raceways under which condition?
CorrectIncorrect -
Question 88 of 325
88. Question
Multi-wire branch circuits shall supply only __________.
CorrectIncorrect -
Question 89 of 325
89. Question
Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be __________.
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Question 90 of 325
90. Question
Double-throw knife switches shall be permitted to be mounted so that the throw is __________.
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Question 91 of 325
91. Question
Which of these is considered the “highest-rated” motor:
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Question 92 of 325
92. Question
Sheet metal auxiliary gutters shall be supported and secured throughout their entire length at intervals not exceeding __________.
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Question 93 of 325
93. Question
Select the feeder conductor size for the following motor group, using 75 degree terminations, and THW copper conductors. (All have a S.F. of 1.15 and a Marked Temp Rise of 40 degrees C):
Motor Group consists of 4 motors tapped on the same feeder:
- Motor 1 – 3 phase, 208 V, 50 HP motor
- Motor 2 – 3 phase, 208 V, 30 HP motor
- Motor 3 – 3 phase, 208 V, 20 HP motor
- Motor 4 – 3 phase, 208 V, 10 HP motor
CorrectIncorrect -
Question 94 of 325
94. Question
Determine the MINIMUM 20-ampere, 277-volt general lighting branch circuits required for a 150,000 square foot retail department store when the actual connected lighting load is 400 kVA. *Note: Circuit breakers of this size are not rated for continuous use.
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Question 95 of 325
95. Question
A 60 cycle-per-second waveform changes direction __________ times per second.
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Question 96 of 325
96. Question
Nonmetallic-sheathed cable shall be supported and secured by staples, or other means, at intervals not exceeding __________ and within __________ of every cable entry into enclosures such as outlet boxes, junction boxes, cabinets, or fittings.
CorrectIncorrect -
Question 97 of 325
97. Question
The line demand load and neutral demand load for a dryer with a nameplate rating of 6,500 VA is:
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Question 98 of 325
98. Question
Fire-Resistive Cable System cables and conductors shall be surface marked with the suffix __________, along with the circuit integrity duration in hours, and with the system identifier.
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Question 99 of 325
99. Question
Excluding exceptions, what is the minimum size of Overhead Service Conductors?
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Question 100 of 325
100. Question
Fixed electric space heating equipment and motors shall be considered what type of load?
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Question 101 of 325
101. Question
Type NM, Type NMC, and Type NMS cables shall be permitted to be used in the following, except as prohibited in 334.12:
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Question 102 of 325
102. Question
CorrectIncorrect -
Question 103 of 325
103. Question
Fire alarm circuits shall be identified at terminal and junction locations in a manner that __________ during testing and servicing of other systems.
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Question 104 of 325
104. Question
What is the cubic inch capacity required for a device box containing (1) duplex receptacle, (2) cable clamps, and (2) 12AWG with ground nonmetallic sheathed cables?
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Question 105 of 325
105. Question
Where supplementary overcurrent protection is used for luminaires, appliances, and other equipment or for internal circuits and components of equipment, it __________ as a substitute for required branch-circuit overcurrent devices or in place of the required branch-circuit protection.
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Question 106 of 325
106. Question
Where structural reinforcing steel is not available or encapsulated in a nonconductive compound, a copper conductor(s) shall be utilized where all of the following requirements are met, except:
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Question 107 of 325
107. Question
The allowable ampacity of a size 4 AWG THW copper conductor installed in a conduit with three (3) other current-carrying conductors of the same size and insulation, in a location with an ambient temperature of 89 degrees F is __________.
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Question 108 of 325
108. Question
Current will primarily flow __________.
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Question 109 of 325
109. Question
Which 120-volt, single-phase, 15- and 20-ampere dwelling branch circuits, supplying outlets or devices, shall be protected by an AFCI device?
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Question 110 of 325
110. Question
CorrectIncorrect -
Question 111 of 325
111. Question
When connecting energy storage systems to other sources, only inverters and ac modules listed and identified as __________ shall be permitted on interactive systems.
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Question 112 of 325
112. Question
For each dryer in a dwelling unit, __________ volt-amperes shall be used when calculating the load for the service.
CorrectIncorrect -
Question 113 of 325
113. Question
In a dwelling unit, which of these locations are NOT required to be protected by and arc- fault circuit interrupter?
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Question 114 of 325
114. Question
Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes is the definition of what?
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Question 115 of 325
115. Question
Electrical continuity at service equipment, service raceways, and service conductor enclosures shall be ensured by one of the following methods:
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Question 116 of 325
116. Question
Underground wiring shall be installed in threaded rigid metal conduit or threaded steel intermediate metal conduit or, where buried under not less than __________ of cover, shall be permitted in Type PVC conduit, Type RTRC conduit, or a listed cable.
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Question 117 of 325
117. Question
What is the cost of power consumed per month, at $0.09/kWh, for a 120-volt circuit that’s faulted to a ground rod with 25-ohms of resistance?
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Question 118 of 325
118. Question
A 3-phase 240-volt service fed with (3) 2/0 aluminum conductors shall have a minimum size main bonding jumper of what size?
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Question 119 of 325
119. Question
Each branch-circuit disconnect rated __________ or more and installed on solidly grounded wye electrical systems of more than 150 volts to ground, but not exceeding 600 volts phase-to-phase, shall be provided with ground-fault protection of equipment
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Question 120 of 325
120. Question
Where a 20-ampere rated branch-circuit in a residence supplies only fixed resistance-type baseboard electric heaters, this branch-circuit may be loaded to a MAXIMUM value of __________.
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Question 121 of 325
121. Question
A building that consists solely of two dwelling units is a(n) __________.
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Question 122 of 325
122. Question
Disregarding special conditions or occupancies, a building or other structure that is served by a branch circuit or feeder on the load side of a service disconnecting means shall be supplied by __________.
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Question 123 of 325
123. Question
Determine the total Heating and A/C load for a single-family dwelling unit with the following (rated at 240 V):
- Heating- 16,000 VA
- A/C- 10,000 VA
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Question 124 of 325
124. Question
CorrectIncorrect -
Question 125 of 325
125. Question
In a dwelling unit, the overhead service conductors (not over 1000 volts) shall be kept not less than __________ feet from the side of a window that is designed to be opened.
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Question 126 of 325
126. Question
No parts of cord-connected luminaires, chain, cable, or cord suspended luminaires, lighting track, pendants, or ceiling-suspended (paddle) fans shall be located within a zone measuring horizontally and __________ vertically from the top of the bathtub rim or shower stall threshold.
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Question 127 of 325
127. Question
In a separately derived system, a supply-side bonding jumper shall not be required to be larger than:
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Question 128 of 325
128. Question
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Question 129 of 325
129. Question
The total marked rating of a cord- and attachment-plug-connected room air conditioner shall not exceed __________ of the rating of a branch circuit where no other loads are supplied.
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Question 130 of 325
130. Question
Type 4 component assemblies and other component type SPDs shall:
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Question 131 of 325
131. Question
A bare #4 AWG copper conductor has a diameter of __________.
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Question 132 of 325
132. Question
Overhead spans of open conductors and open multiconductor cables of not over 1000 volts, nominal, shall have a clearance of not less than __________ over public streets, alleys, roads, parking areas subject to truck traffic, driveways on other than residential property, and other land traversed by vehicles, such as cultivated, grazing, forest, and orchard
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Question 133 of 325
133. Question
Determine the MINIMUM size listed metal box permitted by the NEC that contains . two (2) size 12 AWG. conductors and three (3) size 8 AWG conductors.
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Question 134 of 325
134. Question
A dwelling unit is a single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for:
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Question 135 of 325
135. Question
The ground fault protection system shall operate to cause the service disconnect to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be __________ amperes, and the maximum time delay shall be one second for ground-fault currents equal to or greater than __________ amperes.
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Question 136 of 325
136. Question
What is the additional motor load needed for a single-family dwelling unit with an attic fan rated at 1,500 VA, 120-V.
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Question 137 of 325
137. Question
Snap switches are considered to be part of the effective ground-fault current path when __________.
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Question 138 of 325
138. Question
The service disconnecting means shall consist of not more than __________ switches or circuit breakers.
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Question 139 of 325
139. Question
The ampacity of the branch circuit conductors and the rating or setting of overcurrent protective devices shall not be less than __________ of the total nameplate rated load.
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Question 140 of 325
140. Question
The width of working space in front of electrical equipment shall be the width of the equipment or __________, whichever is greater.
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Question 141 of 325
141. Question
In an outside branch circuit, open conductors shall be separated from open conductors of other circuits or systems by not less than __________.
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Question 142 of 325
142. Question
As a fixed wiring method encased in 3 inches of concrete, Type AC cable shall be permitted to be used where installed in an occupancy where more 100 or more people will gather or assemble.
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Question 143 of 325
143. Question
Type 4 component assemblies and other component type SPDs:
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Question 144 of 325
144. Question
Any combustible wall or ceiling finish exposed between the edge of a luminaire canopy or pan and an outlet box having a surface area of __________ shall be covered with noncombustible material.
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Question 145 of 325
145. Question
A park trailer floor is 40 ft by 10 ft and has the following loads:
- two small appliance circuits
- a 1000-VA, 240-V heater,
- a 200-VA, 120-V exhaust fan,
- a 400-VA, 120-V dishwasher,
- a 7000-VA electric range.
Calculate the total amperage per leg of this system.
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Question 146 of 325
146. Question
The NEC requires __________ receptacle outlet(s) to be installed on an electric sign.
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Question 147 of 325
147. Question
Branch circuits are the circuits between service equipment and the next sub-panel in a residence
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Question 148 of 325
148. Question
GFCI Protection is required in all of the following locations except:
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Question 149 of 325
149. Question
In a Motor Fuel Dispensing, Facility underground wiring shall be installed in rigid poly-vinyl chloride conduit or stainless electrical metallic tubing.
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Question 150 of 325
150. Question
Permanently attached power supply cable(s) for overhead gantries shall be provided with __________ upon exposure to strain that could result in either cable damage or separation from the power service delivery device and exposure of live parts.
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Question 151 of 325
151. Question
For a motor load, in combination with other loads, the total calculated load shall be based on __________% of the largest motor load plus the sum of the other loads.
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Question 152 of 325
152. Question
On a 4-wire, delta connected system where the midpoint of 1 phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is __________ in color, or by other effective means.
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Question 153 of 325
153. Question
All electric pool water heaters shall have the heating elements subdivided into loads not exceeding __________, and protected at not over __________.
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Question 154 of 325
154. Question
What’s the ampacity of 4 current carrying #8 THHN conductors installed in an ambient temperature of 90-degrees F?
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Question 155 of 325
155. Question
Using the standard calculation, what is the general lighting and receptacle load (volt-amperes) for a 2,000 square foot dwelling unit with 2 small appliance branch circuits and 1 laundry branch circuit.
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Question 156 of 325
156. Question
Open outside branch circuit conductors shall be separated from open conductors of other circuits or systems by not less than:
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Question 157 of 325
157. Question
Documentation of the engineered design by a licensed professional engineer engaged primarily in the design of such systems for the spacing between conductors shall be available upon request of the authority having jurisdiction and shall include consideration of which of the following:
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Question 158 of 325
158. Question
Power supply to premises wiring systems shall be permitted to have less capacity than the calculated load. The capacity of the stand-alone supply shall be equal to or greater than the load posed by the __________ utilization equipment connected to the system. Calculated general lighting loads shall not be considered as a single load.
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Question 159 of 325
159. Question
Find the current of a 120-volt circuit that supplies a lamp which has a resistance of 192 ohms.
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Question 160 of 325
160. Question
What is the total neutral load for a 20,000 sq ft bank, with fluorescent luminaires supplied by a 120/208 volt, 3-phase, four-wire service? The bank contains the following equipment:
200 duplex receptacles
4 20-ampere 120-volt dedicated coffee bar circuits
5 30-ampere 208-volt, 3-phase copier outlets (non-continuous)
4 15-kW heat pumps, 3-phase, 208-volt (supplemental heat included)
4 1.5-kW hot water heaters, 3-phase 208-volts
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Question 161 of 325
161. Question
GFCI protection is required with __________ meters from the top inside edge of the bowl of the sink
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Question 162 of 325
162. Question
Type MV cable (Medium Voltage) shall be permitted for use on power systems rated up to and including 35,000 volts, nominal, in which of these circumstances:
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Question 163 of 325
163. Question
A three-phase 230-volt wound-rotor motor rated at 15HP requires short-circuit and ground-fault protection. The manufacturer calls for a Nontime Delay Fuse to protect the motor. What size fuse shall be selected?
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Question 164 of 325
164. Question
CorrectIncorrect -
Question 165 of 325
165. Question
Exposed live parts on one side of the working space and grounded parts on the other side of the working space must have of __________ clearance in a 277-volt to ground.
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Question 166 of 325
166. Question
A 120/208v 3-phase panel with exposed live parts on one side, and no live or grounded parts on the other side of the working space, must have a minimum clear working distance of __________ in front of the panel.
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Question 167 of 325
167. Question
Snap switches are considered to be part of the effective ground-fault current path when __________.
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Question 168 of 325
168. Question
Where conductors carrying alternating current are installed in ferrous metal enclosures or ferrous metal raceways, they shall be arranged so as to avoid heating the surrounding ferrous metal by induction. To accomplish this, all phase conductors and, where used, the grounded conductor and all equipment grounding conductors shall be __________.
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Question 169 of 325
169. Question
All persons and all electrically conductive objects, including any metal parts of the process equipment or apparatus, containers of material, exhaust ducts, and piping systems that convey flammable or combustible liquids __________.
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Question 170 of 325
170. Question
Where a park trailer panelboard is not exposed to the inside aisle space, the working clearance for the panelboard shall be not less than __________ wide and __________ deep.
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Question 171 of 325
171. Question
The ampacity of the supply conductors for a welder that may be operated at different times at different values of primary current or duty cycle shall not be less than __________ of the rated primary current for seam and automatically fed welders, and __________ of the rated primary current for manually operated nonautomatic welders.
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Question 172 of 325
172. Question
If the voltage drop of a circuit is 3-volts, and the current flowing through that circuit is 100 amperes, what is the resistance?
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Question 173 of 325
173. Question
Type SE service-entrance cable shall be permitted for use where the insulated conductors are used for circuit wiring and the uninsulated conductor is used only for equipment grounding purposes – without considering exceptions.
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Question 174 of 325
174. Question
AFCI protection is not required in which of the following rooms in a dwelling unit?
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Question 175 of 325
175. Question
Ground clamps or other fittings exposed to physical damage shall be enclosed in metal, wood, or equivalent protective covering.
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Question 176 of 325
176. Question
An industrial machine nameplate shall be attached to the control equipment enclosure or machine and shall be plainly visible after installation. The nameplate shall include everything except for the following information:
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Question 177 of 325
177. Question
An insulated grounded conductor of 4 AWG or larger shall be identified by which one of the following means:
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Question 178 of 325
178. Question
For devices with screw shells, the terminal for the __________ conductor shall be connected to the screw shell.
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Question 179 of 325
179. Question
In a trench below 2 in thick concrete or equivalent, conductors installed in Ridgid Metal Conduit must be buried below a minimum of __________:
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Question 180 of 325
180. Question
Where more than one piece of X-Ray equipment is operated from the same high-voltage circuit, each piece or each group of equipment as a unit shall be provided with a(n) __________.
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Question 181 of 325
181. Question
Type ITC cable shall not be installed on circuits operating at more than __________.
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Question 182 of 325
182. Question
A(n) __________ shall be permitted to be used in lieu of a box at the end of a rigid metal conduit, intermediate metal conduit, or electrical metallic tubing where the raceway terminates at unenclosed controls or similar equipment, including contact conductors, collectors, resistors, brakes, power-circuit limit switches, and dc split-frame motors.
CorrectIncorrect -
Question 183 of 325
183. Question
Resistors and reactors shall not be installed in close enough proximity to combustible materials to constitute a fire hazard and shall have a clearance of not less than __________ from combustible materials.
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Question 184 of 325
184. Question
An interlock shall not be required for portable cord-and-plug-connected electric vehicle supply equipment intended for connection to receptacle outlets rated at __________, single phase, 15 and 20 amperes.
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Question 185 of 325
185. Question
Electricity is a visible force that flows through conductors
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Question 186 of 325
186. Question
Which of the following is not electromagnetic?
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Question 187 of 325
187. Question
What is the allowable ampacity for a flexible Type-SO cord with 3 current-carrying conductors?
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Question 188 of 325
188. Question
When calculating branch-circuit, feeder, and service loads, calculations are permitted to be rounded to the nearest whole ampere with decimal fractions smaller than __________ being dropped.
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Question 189 of 325
189. Question
A store 50 ft by 60 ft, or 3000 ft2, has 30 ft of show window. There are a total of 80 duplex receptacles. The service is 120/240 V, single-phase 3-wire service. The actual connected lighting load is 8,500 VA. Calculate the minimum size overcurrent protection device for this service.
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Question 190 of 325
190. Question
Fire alarm circuits shall be identified __________ in a manner that helps to prevent unintentional signals on fire alarm system circuit(s) during testing and servicing of other systems.
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Question 191 of 325
191. Question
Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are:
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Question 192 of 325
192. Question
In a building supplied by a feeder(s) two or three single-pole switches or breakers capable of individual operation shall be permitted on multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect, provided they are equipped with identified handle ties or a master handle to disconnect all ungrounded conductors __________.
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Question 193 of 325
193. Question
Multi-wire branch circuits shall supply only __________.
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Question 194 of 325
194. Question
What is the total resistance of three 15-ohm resistors connected in parallel?
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Question 195 of 325
195. Question
Without considering exceptions Park Trailer receptacle outlets shall be installed at wall spaces __________ wide or more so that no point along the floor line is more than __________, measured horizontally, from an outlet in that space.
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Question 196 of 325
196. Question
Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage __________ the current that must be interrupted.
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Question 197 of 325
197. Question
Where the secondary resistor of a wound-rotor AC motor is separate from the controller, and the motor is rated for light intermittent duty, the ampacity of the conductors between controller and resistor shall not be less than:
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Question 198 of 325
198. Question
Where __________ branch circuits supply devices or equipment on the same yoke or mounting strap, a means to simultaneously disconnect the ungrounded supply conductors shall be provided at the point at which the branch circuits originate.
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Question 199 of 325
199. Question
The minimum clearance between incandescent luminaires installed in clothes closets and the nearest point of a closet storage space shall be:
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Question 200 of 325
200. Question
Which of the following are not sources of magnetism that can be derived electrically?
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Question 201 of 325
201. Question
Heat-resistant thermoplastic insulation covering 8 AWG conductors are listed for use in __________ and __________ locations?
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Question 202 of 325
202. Question
GFCI protection is not required in a kitchen where it is not directly serving a countertop and is not within 6ft from the top inside edge of the bowl of the sink.
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Question 203 of 325
203. Question
The ground fault protection system shall operate to cause the service disconnect to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be __________ amperes, and the maximum time delay shall be one second for ground-fault currents equal to or greater than __________ amperes.
CorrectIncorrect -
Question 204 of 325
204. Question
Where the outer sheath of a MI cable is made of __________, it shall provide an adequate path to serve as an equipment grounding conductor. Where the outer sheath is made of __________, a separate equipment grounding conductor shall be provided.
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Question 205 of 325
205. Question
A conductor installed on the supply side of a service or within a service equipment enclosure(s), or for a separately derived system, that ensures the required electrical conductivity between metal parts required to be electrically connected is a:
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Question 206 of 325
206. Question
The operating handle of a circuit breaker shall be permitted to be accessible without opening a door or cover.
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Question 207 of 325
207. Question
Ground-fault circuit-interrupter protection for personnel shall be installed in the branch circuit supplying luminaires operating at:
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Question 208 of 325
208. Question
A raceway contains (6) 1/0 AWG THW copper conductors across a boiler room ceiling (110-degrees-F). What is the allowable ampacity of these conductors?
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Question 209 of 325
209. Question
Vegetation such as trees __________ be used for support of overhead service conductors or service equipment.
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Question 210 of 325
210. Question
In industrial occupancies, infrared industrial process heating equipment lampholders shall be permitted to be operated in series on circuits of __________, provided the voltage rating of the lampholders is not less than the circuit voltage.
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Question 211 of 325
211. Question
For other than a totally enclosed switchboard or switchgear, a space not less than __________ shall be provided between the top of the switchboard or switchgear and any combustible ceiling, unless a noncombustible shield is provided between the switchboard or switchgear and the ceiling.
CorrectIncorrect -
Question 212 of 325
212. Question
Circuits exceeding 120 volts, nominal, between conductors and not exceeding 277 volts, nominal, to ground shall be permitted to supply luminaires for illumination of indoor areas of residential single- and multi-family dwellings.
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Question 213 of 325
213. Question
In a Motor Fuel Dispensing, Facility underground wiring shall be installed in rigid poly-vinyl chloride conduit or stainless electrical metallic tubing.
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Question 214 of 325
214. Question
An insulated grounded conductor of 4 AWG or larger shall be identified by which one of the following means:
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Question 215 of 325
215. Question
Type MV cable (Medium Voltage) shall be permitted for use on power systems rated up to and including 35,000 volts, nominal, in which of these circumstances:
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Question 216 of 325
216. Question
Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are:
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Question 217 of 325
217. Question
Ground clamps or other fittings exposed to physical damage shall be enclosed in metal, wood, or equivalent protective covering.
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Question 218 of 325
218. Question
A conductor installed on the supply side of a service or within a service equipment enclosure(s), or for a separately derived system, that ensures the required electrical conductivity between metal parts required to be electrically connected is a:
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Question 219 of 325
219. Question
In a(n) __________ system, electrical equipment, wiring, and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit from any point on the wiring system to the electrical supply source to facilitate the operation of overcurrent devices should a second ground fault from a different phase occur on the wiring system.
CorrectIncorrect -
Question 220 of 325
220. Question
A store 50 ft by 60 ft, or 3000 ft2, has 30 ft of show window. There are a total of 80 duplex receptacles. The service is 120/240 V, single-phase 3-wire service. The actual connected lighting load is 8,500 VA. Calculate the minimum size overcurrent protection device for this service.
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Question 221 of 325
221. Question
The earth shall be considered as an effective fault-current path.
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Question 222 of 325
222. Question
The ground fault protection system shall operate to cause the service disconnect to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be __________ amperes, and the maximum time delay shall be one second for ground-fault currents equal to or greater than __________ amperes.
CorrectIncorrect -
Question 223 of 325
223. Question
Where Compressed Natural Gas or Liquefied Natural Gas dispensers are installed beneath a canopy or enclosure, either the canopy or enclosure shall be designed to prevent accumulation or entrapment of ignitable vapors or all electrical equipment installed beneath the canopy or enclosure shall be suitable for __________.
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Question 224 of 325
224. Question
All pull boxes, junction boxes, and conduit bodies shall be provided with covers compatible with the box or conduit body construction and suitable for the conditions of use. Where used, metal covers shall:
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Question 225 of 325
225. Question
The demand load for a dryer in a single-family dwelling unit, rated at 6,000 VA is __________.
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Question 226 of 325
226. Question
In a Commercial Garage, all 125-volt, single-phase, 15- and 20-ampere receptacles installed in areas where electrical diagnostic equipment, electrical hand tools, or portable lighting equipment are to be used shall have __________.
CorrectIncorrect -
Question 227 of 325
227. Question
Receptacles shall be mounted in identified boxes or assemblies. The boxes or assemblies shall be securely fastened in place unless otherwise permitted elsewhere in this code. Screws for the purpose of attaching receptacles to a box shall be of the type provided with a listed receptacle, or shall be machine screws having __________ threads per inch:
CorrectIncorrect -
Question 228 of 325
228. Question
For motors used in alternating-current, adjustable voltage, variable torque drive systems, the ampacity of conductors, or ampere ratings of switches, branch-circuit short-circuit and ground-fault protection, and so forth, shall be based on ___________.
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Question 229 of 325
229. Question
A receptacle outlet shall be installed at each countertop and work surface that is __________ or wider.
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Question 230 of 325
230. Question
The TOTAL A/C and heating load for a single-family dwelling unit with a 240-V 18,000 VA heating load and a 240-V 12,000 VA A/C load is__________.
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Question 231 of 325
231. Question
In an Ungrounded 240-volt 3-phase system, an equipment grounding conductor shall be installed with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode(s). The grounding electrode(s) shall also be connected to __________.
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Question 232 of 325
232. Question
When installing conductors in a rigid metal conduit that is buried under 3 inches of concrete, to what depth does this conduit need to be buried?
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Question 233 of 325
233. Question
Raceways shall be used as a means of support for other raceways under which condition?
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Question 234 of 325
234. Question
Where heating equipment is supplied by more than one source, feeder, or branch circuit, the disconnecting means shall be __________. Each disconnecting means shall simultaneously disconnect all ungrounded conductors that it controls.
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Question 235 of 325
235. Question
Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage ________ the current that is available at the line terminals of the equipment.
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Question 236 of 325
236. Question
A box containing pendant- or flush-mounted receptacles attached to a multiconductor cable via strain relief or a multipole connector is:
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Question 237 of 325
237. Question
Fixed electric space heating equipment and motors shall be considered what type of load?
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Question 238 of 325
238. Question
In a dwelling unit, which of these locations are NOT required to be protected by and arc- fault circuit interrupter?
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Question 239 of 325
239. Question
Fire-Resistive Cable System cables and conductors shall be surface marked with the suffix __________, along with the circuit integrity duration in hours, and with the system identifier.
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Question 240 of 325
240. Question
When connecting energy storage systems to other sources, only inverters and ac modules listed and identified as __________ shall be permitted on interactive systems.
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Question 241 of 325
241. Question
No parts of cord-connected luminaires, chain, cable, or cord suspended luminaires, lighting track, pendants, or ceiling-suspended (paddle) fans shall be located within a zone measuring horizontally and __________ vertically from the top of the bathtub rim or shower stall threshold.
CorrectIncorrect -
Question 242 of 325
242. Question
Select the feeders for a series of ranges being installed in a structure, based on the following loads:
- 5 ranges, each rated at 11 kW
- 2 ranges, each rated 12 kW
- 20 ranges, each rated 13.5 kW
- 3 ranges, each rated 18 kW
CorrectIncorrect -
Question 243 of 325
243. Question
The ampacity of the branch circuit conductors and the rating or setting of overcurrent protective devices shall not be less than __________ of the total nameplate rated load.
CorrectIncorrect -
Question 244 of 325
244. Question
Exposed live parts on one side of the working space and grounded parts on the other side of the working space must have of __________ clearance in a 277-volt to ground.
CorrectIncorrect -
Question 245 of 325
245. Question
What is the total demand load for the following restaurant:
A restaurant has all electric appliances, a connected lighting load that includes a sign, totaling 50,000VA. The electrical service is rated at 120/208-volt, three-phase. The restaurant contains the following loads:
120-volt loads
- 60 duplex receptacles
- 100 ft multi-outlet assembly (simultaneous rated)
- 1 broiler 5 kW
- 2 deep fryers 5.5 kW
- 1 freezer 3,400VA
- 1 booster heater 1,500VA
- 1 coffee service machine 3,500VA
- 1 dishwasher 3,500VA
208-volt loads
- 1 walk-in cooler 6,400VA
- 1 water heater 4,800VA
- 1 oven 20kW
- 1 range 15kW
- 2 convection ovens 8kW
- 15kW electric heater
- 14kW AC
- 3 exhaust fans 2.4 amperes
- 1 cooktop 10kW
- 2 10kW heating units
CorrectIncorrect -
Question 246 of 325
246. Question
Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be __________.
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Question 247 of 325
247. Question
For devices with screw shells, the terminal for the __________ conductor shall be connected to the screw shell.
CorrectIncorrect -
Question 248 of 325
248. Question
In a building supplied by a feeder(s) two or three single-pole switches or breakers capable of individual operation shall be permitted on multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect, provided they are equipped with identified handle ties or a master handle to disconnect all ungrounded conductors __________.
CorrectIncorrect -
Question 249 of 325
249. Question
What is the minimum size Flexible Metal Conduit (FMC) that can be used to house the following conductors:
(1) #1 THHN
(2) #2 THHN
(2) #4 THHN
CorrectIncorrect -
Question 250 of 325
250. Question
The operating handle of a circuit breaker shall be permitted to be accessible without opening a door or cover.
CorrectIncorrect -
Question 251 of 325
251. Question
In an outside branch circuit, open conductors shall be separated from open conductors of other circuits or systems by not less than __________.
CorrectIncorrect -
Question 252 of 325
252. Question
Exposed structural metal that is interconnected to form a metal building frame and is not intentionally grounded or bonded and is likely to become energized shall be bonded to which of the following:
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Question 253 of 325
253. Question
What’s the ampacity of 4 current carrying #8 THHN conductors installed in an ambient temperature of 90-degrees F?
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Question 254 of 325
254. Question
A grounded circuit conductor shall not be used for grounding non-current-carrying metal parts of equipment on the load side of the service disconnecting means or on the load side of a separately derived system disconnecting means or the overcurrent devices for a separately derived system not having a main disconnecting means, except for which of the following:
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Question 255 of 325
255. Question
Luminaires shall be constructed, installed, or equipped with shades or guards so that combustible material is not subjected to temperatures in excess of:
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Question 256 of 325
256. Question
The ampacity of UF cable shall be that of:
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Question 257 of 325
257. Question
The supply-side bonding jumper for a 240-volt single-phase service fed with (2) 300kcmil Aluminum ungrounded conductors should be what size:
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Question 258 of 325
258. Question
For a one-family dwelling with a service rated 400-amps, the service conductors supplying the entire load associated with a one-family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than __________ of the service rating.
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Question 259 of 325
259. Question
Which one of the following listed wiring methods is NOT permitted to be installed in ducts specifically fabricated to transport environmental air?
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Question 260 of 325
260. Question
Snap switches are considered to be part of the effective ground-fault current path when __________.
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Question 261 of 325
261. Question
What is the full-load current of a 100-HP 500-volt Direct-Current motor?
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Question 262 of 325
262. Question
Multi-wire branch circuits shall supply only __________.
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Question 263 of 325
263. Question
Where more than one piece of X-Ray equipment is operated from the same high-voltage circuit, each piece or each group of equipment as a unit shall be provided with a(n) __________.
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Question 264 of 325
264. Question
Type NM, Type NMC, and Type NMS cables shall be permitted to be used in the following, except as prohibited in 334.12:
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Question 265 of 325
265. Question
Permanently attached power supply cable(s) for overhead gantries shall be provided with __________ upon exposure to strain that could result in either cable damage or separation from the power service delivery device and exposure of live parts.
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Question 266 of 325
266. Question
Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes is the definition of what?
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Question 267 of 325
267. Question
How many 1/0 AWG XHHW-2 conductors shall be permitted to be installed in a run of 2″ electrical metallic tubing (EMT), not considering ambient correction factors, or number of conductors that are current-carrying.
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Question 268 of 325
268. Question
Disregarding exceptions, each conductor of a lead-in from an outdoor antenna shall be provided with a(n) __________.
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Question 269 of 325
269. Question
An energy management system shall not override the load shedding controls put in place to ensure the minimum electrical capacity for the following:
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Question 270 of 325
270. Question
In a separately derived system, a supply-side bonding jumper shall not be required to be larger than:
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