325 Practice Questions for Electricians
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- Current
- Review
- Answered
- Correct
- Incorrect
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Question 1 of 329
1. Question
The operating handle of a circuit breaker shall be permitted to be accessible without opening a door or cover.
CorrectIncorrect -
Question 2 of 329
2. Question
What’s the ampacity of 4 current carrying #8 THHN conductors installed in an ambient temperature of 90-degrees F?
CorrectIncorrect -
Question 3 of 329
3. Question
The operating handle of a circuit breaker shall be permitted to be accessible without opening a door or cover.
CorrectIncorrect -
Question 4 of 329
4. 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 5 of 329
5. 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:
CorrectIncorrect -
Question 6 of 329
6. 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:
CorrectIncorrect -
Question 7 of 329
7. Question
The radius of the curve of the inner edge of any bend of Type SE cable, during or after installation, shall not be less than __________ the diameter of the cable.
CorrectIncorrect -
Question 8 of 329
8. Question
When calculating a service load, a load of not less than __________ volt-amperes shall be included for each 2-wire laundry branch circuit installed.
CorrectIncorrect -
Question 9 of 329
9. Question
Metal cable tray can be used as an equipment grounding conductor where __________.
CorrectIncorrect -
Question 10 of 329
10. Question
Electrified truck parking space equipment provided from either overhead gantry or cable management systems shall __________ in electrified truck parking space supply equipment.
CorrectIncorrect -
Question 11 of 329
11. Question
Cable trays used to support service-entrance conductors shall contain only service-entrance conductors and shall be limited to which of the following methods:
CorrectIncorrect -
Question 12 of 329
12. 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 13 of 329
13. Question
Cable trays used to support service entrance conductors shall contain only service entrance conductors.
CorrectIncorrect -
Question 14 of 329
14. Question
Electrical continuity at service equipment, service raceways, and service conductor enclosures shall be ensured by one of the following methods:
CorrectIncorrect -
Question 15 of 329
15. 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 16 of 329
16. 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 17 of 329
17. 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?
CorrectIncorrect -
Question 18 of 329
18. Question
When installing Underground Service Conductors, all of the following are approved methods except:
CorrectIncorrect -
Question 19 of 329
19. Question
The total cross-sectional area of 100 feet run of 2 inch EMT conduit is 3.356 square inches and has 6 12 AWG conductors inside it. What is the total area allowed to be taken up by all conductors in this conduit, regardless of quantity?
CorrectIncorrect -
Question 20 of 329
20. Question
A conducting object through which a direct connection to earth is established is termed a(n):
CorrectIncorrect -
Question 21 of 329
21. Question
What is the maximum allowed 1/0 AWG THHN conductors can fit in a 1 ½” EMT conduit?
CorrectIncorrect -
Question 22 of 329
22. 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 23 of 329
23. Question
What is the minimum size PVC schedule 40 conduit required for the following conductors?
- (10) 12 AWG THW
- (12) 10 AWG TW
- (6) 8 AWG THHN
- (6) 6 AWG THHN
CorrectIncorrect -
Question 24 of 329
24. Question
Audio system equipment supplied by branch-circuit power shall not be placed horizontally within __________ of the inside wall of a pool, spa, hot tub, or fountain, or within __________ of the prevailing or tidal high water mark.
CorrectIncorrect -
Question 25 of 329
25. Question
In a Major Repair Garage (where lighter-than-air gaseous fueled vehicles are repaired or stored – such as hydrogen and natural gas), the area within 18 inches of the ceiling is considered what Classification?
CorrectIncorrect -
Question 26 of 329
26. 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 27 of 329
27. Question
Antioxidant material suitable for battery connection and termination shall be:
CorrectIncorrect -
Question 28 of 329
28. 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 29 of 329
29. Question
What is the maximum allowed 1/0 AWG THHN conductors can fit in a 1 ½” EMT conduit?
CorrectIncorrect -
Question 30 of 329
30. Question
(3) #6AWG THWN conductors are installed in a 2″ EMT raceway inside a building that is climate controlled to an ambient temperature of 57-degrees F. What is the corrected ampacity of these conductors after adjustment factors are applied?
CorrectIncorrect -
Question 31 of 329
31. Question
A dead end of a busway shall be __________.
CorrectIncorrect -
Question 32 of 329
32. 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 33 of 329
33. 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 34 of 329
34. 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:
CorrectIncorrect -
Question 35 of 329
35. Question
A box containing pendant- or flush-mounted receptacles attached to a multiconductor cable via strain relief or a multipole connector is:
CorrectIncorrect -
Question 36 of 329
36. Question
A dead end of a busway shall be __________.
CorrectIncorrect -
Question 37 of 329
37. Question
The amount of EMF surrounding a conductor __________ with a(n) __________ in current flow through the conductor.
CorrectIncorrect -
Question 38 of 329
38. Question
For each dryer in a dwelling unit, __________ volt-amperes shall be used when calculating the load for the service.
CorrectIncorrect -
Question 39 of 329
39. Question
The demand load for a dryer in a single-family dwelling unit, rated at 6,000 VA is __________.
CorrectIncorrect -
Question 40 of 329
40. Question
The demand load for the grounded conductor (neutral) for a 6,000 VA dryer is__________.
CorrectIncorrect -
Question 41 of 329
41. Question
For permanently connected appliances rated over 300 volt-amperes, the branch-circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable
CorrectIncorrect -
Question 42 of 329
42. Question
Where used as service-entrance conductors, size 250 kcmil Type IGS cable has an allowable ampacity of __________.
CorrectIncorrect -
Question 43 of 329
43. Question
The ampacity of UF cable shall be that of:
CorrectIncorrect -
Question 44 of 329
44. Question
AFCI protection is not required in which of the following rooms in a dwelling unit?
CorrectIncorrect -
Question 45 of 329
45. 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 46 of 329
46. Question
Double-throw knife switches shall be permitted to be mounted so that the throw is __________.
CorrectIncorrect -
Question 47 of 329
47. Question
Double-throw knife switches shall be permitted to be mounted so that the throw is __________.
CorrectIncorrect -
Question 48 of 329
48. Question
For permanently connected appliances rated over 300 volt-amperes, the branch-circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable
CorrectIncorrect -
Question 49 of 329
49. Question
Switches or circuit breakers shall not disconnect the grounded conductor of a circuit.
CorrectIncorrect -
Question 50 of 329
50. Question
The demand load for a dryer in a single-family dwelling unit, rated at 6,000 VA is __________.
CorrectIncorrect -
Question 51 of 329
51. Question
The line demand load and neutral demand load for a dryer with a nameplate rating of 6,500 VA is:
CorrectIncorrect -
Question 52 of 329
52. Question
For cord-connected equipment such as room air conditioners, household refrigeration and freezers, drinking water coolers, and beverage dispensers, a separable connector or a(n) __________ shall be permitted to serve as the disconnecting means.
CorrectIncorrect -
Question 53 of 329
53. Question
A disconnecting means shall be provided for all __________ derived from a stationary battery system with a voltage over 60-volts DC. A disconnecting means shall be readily accessible and located within sight of the battery system.
CorrectIncorrect -
Question 54 of 329
54. Question
Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect __________ at the point where the branch circuit originates.
CorrectIncorrect -
Question 55 of 329
55. Question
For permanently connected appliances rated at not over __________ or 1? 8hp, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable
CorrectIncorrect -
Question 56 of 329
56. Question
What is the allowable ampacity for a flexible Type-SO cord with 3 current-carrying conductors?
CorrectIncorrect -
Question 57 of 329
57. Question
Switches or circuit breakers shall not disconnect the grounded conductor of a circuit.
CorrectIncorrect -
Question 58 of 329
58. Question
A disconnecting means shall be provided for all __________ derived from a stationary battery system with a voltage over 60-volts DC. A disconnecting means shall be readily accessible and located within sight of the battery system.
CorrectIncorrect -
Question 59 of 329
59. Question
A receptacle outlet shall be installed at each countertop and work surface that is __________ or wider.
CorrectIncorrect -
Question 60 of 329
60. Question
Type S fuse-holders and adaptors shall be designed so that either the fuse-holder itself or the fuse-holder with a Type S adaptor inserted cannot be used for any fuse other than a Type S fuse.
CorrectIncorrect -
Question 61 of 329
61. Question
Type S fuse-holders and adaptors shall be designed so that either the fuse-holder itself or the fuse-holder with a Type S adaptor inserted cannot be used for any fuse other than a Type S fuse.
CorrectIncorrect -
Question 62 of 329
62. 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 63 of 329
63. 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?
CorrectIncorrect -
Question 64 of 329
64. 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 65 of 329
65. Question
Aircraft energizers shall be designed and mounted such that all electrical equipment and fixed wiring will be at least __________ above floor level and shall not be operated in a Class I location.
CorrectIncorrect -
Question 66 of 329
66. Question
The ampacity of UF cable shall be that of:
CorrectIncorrect -
Question 67 of 329
67. Question
Which of these are standard ampere ratings for fuses and inverse time circuit breakers?
CorrectIncorrect -
Question 68 of 329
68. Question
Which of these are standard ampere ratings for fuses and inverse time circuit breakers?
CorrectIncorrect -
Question 69 of 329
69. Question
Type S fuse-holders and adaptors shall be designed so that either the fuse-holder itself or the fuse-holder with a Type S adaptor inserted answer: cannot be used for any fuse other than a Type S fuse.
CorrectIncorrect -
Question 70 of 329
70. Question
The Full-Load Current of a 3-phase 230-volt 5-HP AC wound-rotor motor is __________.
CorrectIncorrect -
Question 71 of 329
71. Question
What is the full-load current of a 100-HP 500-volt Direct-Current motor?
CorrectIncorrect -
Question 72 of 329
72. 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.
CorrectIncorrect -
Question 73 of 329
73. Question
Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are:
CorrectIncorrect -
Question 74 of 329
74. 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 75 of 329
75. 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 76 of 329
76. Question
The minimum size service conductors for a 200 Amp service in a single-family dwelling unit is__________.
CorrectIncorrect -
Question 77 of 329
77. 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.
CorrectIncorrect -
Question 78 of 329
78. Question
The total cross-sectional area of 100 feet run of 2 inch EMT conduit is 3.356 square inches and has 6 12 AWG conductors inside it. What is the total area allowed to be taken up by all conductors in this conduit, regardless of quantity?
CorrectIncorrect -
Question 79 of 329
79. Question
How many 2/0 RHW-2 conductors can be installed in a run of 2 1/2″ EMT (Electrical Metallic Tubing)?
CorrectIncorrect -
Question 80 of 329
80. 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.
CorrectIncorrect -
Question 81 of 329
81. Question
(3) #6AWG THWN conductors are installed in a 2″ EMT raceway inside a building that is climate controlled to an ambient temperature of 57-degrees F. What is the corrected ampacity of these conductors after adjustment factors are applied?
CorrectIncorrect -
Question 82 of 329
82. Question
Where dimmers are installed in ungrounded conductors, each dimmer shall have overcurrent protection not greater than __________ of the dimmer rating and shall be disconnected from all ungrounded conductors when the master or individual switch or circuit breaker supplying such dimmer is in the open position.
CorrectIncorrect -
Question 83 of 329
83. 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 __________.
CorrectIncorrect -
Question 84 of 329
84. 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 __________.
CorrectIncorrect -
Question 85 of 329
85. 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.
CorrectIncorrect -
Question 86 of 329
86. Question
Fire alarm circuits shall be identified at terminal and junction locations in a manner that __________ during testing and servicing of other systems.
CorrectIncorrect -
Question 87 of 329
87. 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.
CorrectIncorrect -
Question 88 of 329
88. 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?
CorrectIncorrect -
Question 89 of 329
89. Question
Find the current of a 120-volt circuit that supplies a lamp which has a resistance of 192 ohms.
CorrectIncorrect -
Question 90 of 329
90. 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 91 of 329
91. 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 92 of 329
92. 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 93 of 329
93. Question
Fire alarm circuits shall be identified at terminal and junction locations in a manner that __________ during testing and servicing of other systems.
CorrectIncorrect -
Question 94 of 329
94. 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.
CorrectIncorrect -
Question 95 of 329
95. Question
What is the full-load current of a 100-HP 500-volt Direct-Current motor?
CorrectIncorrect -
Question 96 of 329
96. Question
Intrinsically safe apparatus, associated apparatus, and other equipment shall be installed __________, unless the equipment is a simple apparatus that does not interconnect intrinsically safe circuits.
CorrectIncorrect -
Question 97 of 329
97. 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.
CorrectIncorrect -
Question 98 of 329
98. Question
An intersystem bonding termination for connecting intersystem bonding conductors shall be provided __________ enclosures at the service equipment or metering equipment enclosures and at the disconnecting means for any additional buildings or structures.
CorrectIncorrect -
Question 99 of 329
99. 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.
CorrectIncorrect -
Question 100 of 329
100. Question
Type MC cable that provides an effective ground-fault current path in accordance with one or more of the following, can be used as an equipment grounding conductor:
CorrectIncorrect -
Question 101 of 329
101. Question
What is the line demand load for a dryer with a nameplate rating of 4,800 VA.
CorrectIncorrect -
Question 102 of 329
102. Question
For cord-connected equipment such as room air conditioners, household refrigeration and freezers, drinking water coolers, and beverage dispensers, a separable connector or a(n) __________ shall be permitted to serve as the disconnecting means.
CorrectIncorrect -
Question 103 of 329
103. 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 104 of 329
104. 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 105 of 329
105. Question
A Single-Phase, 3-wire 240-volt service has (2) 2/0 THHN (copper) ungrounded service entrance conductors, what is the minimum size grounding electrode conductor that must be installed?
CorrectIncorrect -
Question 106 of 329
106. Question
What is the minimum size of the grounding electrode conductor for a service utilizing 750 KCMIL (CU) for the ungrounded conductors?
CorrectIncorrect -
Question 107 of 329
107. Question
The connection of a grounding electrode conductor or bonding jumper to a grounding electrode shall be made in a manner that will:
CorrectIncorrect -
Question 108 of 329
108. Question
The connection of a grounding electrode conductor or bonding jumper to a grounding electrode shall be made in a manner that will:
CorrectIncorrect -
Question 109 of 329
109. Question
A single-phase 3-wire 200-amp service is constructed at a residence. What size copper grounding electrode conductor needs to be installed on this service?
CorrectIncorrect -
Question 110 of 329
110. Question
The equipment grounding terminal buses of the normal and essential branch-circuit panelboards serving the same individual patient care vicinity shall be connected together with an insulated continuous copper conductor not smaller than __________.
CorrectIncorrect -
Question 111 of 329
111. 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__________.
CorrectIncorrect -
Question 112 of 329
112. 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 113 of 329
113. Question
Fixed electric space heating equipment and motors shall be considered what type of load?
CorrectIncorrect -
Question 114 of 329
114. Question
Fixed electric space heating equipment and motors shall be considered what type of load?
CorrectIncorrect -
Question 115 of 329
115. Question
Impedance includes the following:
CorrectIncorrect -
Question 116 of 329
116. Question
When connecting energy storage systems to other sources, only inverters and ac modules listed and identified as __________ shall be permitted on interactive systems.
CorrectIncorrect -
Question 117 of 329
117. 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.
CorrectIncorrect -
Question 118 of 329
118. 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 __________.
CorrectIncorrect -
Question 119 of 329
119. Question
An intersystem bonding termination for connecting intersystem bonding conductors shall be provided __________ enclosures at the service equipment or metering equipment enclosures and at the disconnecting means for any additional buildings or structures.
CorrectIncorrect -
Question 120 of 329
120. Question
The distance outward that an expanding and collapsing electromagnetic field around a conductor can reach, is __________.
CorrectIncorrect -
Question 121 of 329
121. 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
CorrectIncorrect -
Question 122 of 329
122. 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
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Question 123 of 329
123. Question
A receptacle outlet shall be installed at each countertop and work surface that is __________ or wider.
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Question 124 of 329
124. 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 125 of 329
125. 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.
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Question 126 of 329
126. 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 127 of 329
127. 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 128 of 329
128. 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 129 of 329
129. 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 __________.
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Question 130 of 329
130. Question
The minimum size service conductors (AL) for a 150 Amp service in a single-family dwelling unit is __________.
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Question 131 of 329
131. Question
Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are:
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Question 132 of 329
132. Question
A 1/0 copper grounding electrode conductor is appropriate for what size ungrounded service-entrance conductors?
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Question 133 of 329
133. Question
Not including special conditions, occupancies, or capacities – the service disconnecting means for each service shall consist of a combination of not more than __________ switches and sets of circuit breakers, mounted in a single enclosure, in a group of separate enclosures, or in or on a switchboard or in switchgear.
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Question 134 of 329
134. Question
What is the minimum clearance parameter for an open overhead 240-volt feeder traveling over a pool, from the surface of the water?
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Question 135 of 329
135. 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.
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Question 136 of 329
136. 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.
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Question 137 of 329
137. 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)?
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Question 138 of 329
138. 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 139 of 329
139. Question
In overhead services not in excess of 600 volts, nominal, the vertical clearance of final spans above, or within 3 feet measured horizontally of platforms, projections, or surfaces that will permit personal contact shall maintain a minimum clearance of:
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Question 140 of 329
140. Question
In overhead services not in excess of 600 volts, nominal, the vertical clearance of final spans above, or within 3 feet measured horizontally of platforms, projections, or surfaces that will permit personal contact shall maintain a minimum clearance of:
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Question 141 of 329
141. 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 142 of 329
142. 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 143 of 329
143. Question
What is the MAXIMUM size overcurrent protection device required to protect #14AWG conductors used for the pump motor control-circuit that is protected by a motor branch circuit protection device and extends beyond the enclosure?
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Question 144 of 329
144. 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
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Question 145 of 329
145. 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 146 of 329
146. 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 147 of 329
147. Question
What is the MAXIMUM size overcurrent protection device required to protect #14AWG conductors used for the pump motor control-circuit that is protected by a motor branch circuit protection device and extends beyond the enclosure?
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Question 148 of 329
148. Question
Screws used 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 __________ or part of listed assemblies or systems, in accordance with the manufacturer’s instructions.
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Question 149 of 329
149. Question
Which of the following are not sources of magnetism that can be derived electrically?
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Question 150 of 329
150. 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 151 of 329
151. 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 152 of 329
152. 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 153 of 329
153. Question
Excluding exceptions, the feeder or service neutral load shall be the maximum net calculated load between the neutral conductor and__________.
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Question 154 of 329
154. Question
There shall be no reduction of the neutral or grounded conductor capacity applied to the amount in 220.61(C)(1), or portion of the amount in (C)(2), from that determined by the basic calculation:
-
220.61(C)(1)
Any portion of a 3-wire circuit consisting of 2 ungrounded conductors and the neutral conductor of a 4-wire, 3-?phase, wye-connected system
-
220.61(C)(2)
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Question 155 of 329
155. Question
The dwelling has a floor area of 1500 ft2, exclusive of an unfinished cellar not adaptable for future use, unfinished attic, and open porches. It has two 20-A small appliance circuits, one 20-A laundry circuit, two 4-kW wall-mounted ovens, one 5.1-kW counter-mounted cooking unit, a 4.5-kW water heater, a 1.2-kW dishwasher, a 5-kW combination clothes washer and dryer, six 7-A, 230-V room air-conditioning units, and a 1.5-kW permanently installed bathroom space heater. Assume wall-mounted ovens, counter-mounted cooking unit, water heater, dishwasher, and combination clothes washer and dryer kW ratings equivalent to kVA. What is the calculated load (service rating) of this service?
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Question 156 of 329
156. Question
The dwelling has a floor area of 1500 ft2, exclusive of an unfinished cellar not adaptable for future use, unfinished attic, and open porches. It has two 20-A small appliance circuits, one 20-A laundry circuit, two 4-kW wall-mounted ovens, one 5.1-kW counter-mounted cooking unit, a 4.5-kW water heater, a 1.2-kW dishwasher, a 5-kW combination clothes washer and dryer, six 7-A, 230-V room air-conditioning units, and a 1.5-kW permanently installed bathroom space heater. Assume wall-mounted ovens, counter-mounted cooking unit, water heater, dishwasher, and combination clothes washer and dryer kW ratings equivalent to kVA. What is the calculated load (service rating) of this service?
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Question 157 of 329
157. Question
Where manual transfer equipment is used, an optional standby system shall have adequate capacity and rating for the supply of all equipment intended to be operated at one time.
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Question 158 of 329
158. Question
Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets unless located within how many inches of the wall?
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Question 159 of 329
159. Question
Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets unless located within how many inches of the wall?
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Question 160 of 329
160. Question
The following methods are approved for outside branch circuits and feeders installed on buildings or other structures except:
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Question 161 of 329
161. Question
It is appropriate to use the “optional feeder and service load calculation” method to a dwelling unit having the total connected load served by a __________ or __________ set of 3 wire service or feeder conductors with an ampacity of 100 amps or greater.
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Question 162 of 329
162. 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 __________.
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Question 163 of 329
163. 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 164 of 329
164. 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 165 of 329
165. Question
What is the total resistance of three 15-ohm resistors connected in parallel?
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Question 166 of 329
166. 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 167 of 329
167. Question
__________ percent of the peak voltage is the effective voltage.
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Question 168 of 329
168. Question
Excluding exceptions, what is the minimum size of Overhead Service Conductors?
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Question 169 of 329
169. Question
A phase converter with a nameplate input rating of 100FLA, protecting a variable load, shall have overcurrent protection set at __________.
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Question 170 of 329
170. Question
Where manual transfer equipment is used, an optional standby system shall have adequate capacity and rating for the supply of all equipment intended to be operated at one time.
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Question 171 of 329
171. Question
A single-family dwelling has a Single-Phase 125-ampere sub-panel in the garage with a main breaker in it rated at 125-amperes. What size equipment grounding conductor shall be used to feed the sub-panel?
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Question 172 of 329
172. Question
Which of these are “standard sizes” for fuses, in regards to the National Electrical Code?
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Question 173 of 329
173. Question
A bare #4 AWG copper conductor has a diameter of __________.
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Question 174 of 329
174. Question
The Full-Load Current of a 3-phase 230-volt 5-HP AC wound-rotor motor is __________.
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Question 175 of 329
175. Question
A 60 cycle-per-second waveform changes direction __________ times per second.
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Question 176 of 329
176. Question
Electrical service and feeders shall be calculated on the basis of not less than __________ per electrified truck parking space.
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Question 177 of 329
177. Question
Any insulated cable 0-750 volts to ground, supported on and cabled together with a solidly grounded bare messenger or solidly grounded neutral conductor must maintain a clearance of __________ feet in any direction from the water level, edge of water surface, base of diving platform, or permanently anchored raft.
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Question 178 of 329
178. Question
Without applying exceptions, service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a clearance of __________ from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, or similar locations.
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Question 179 of 329
179. Question
A 1/0 copper grounding electrode conductor is appropriate for what size ungrounded service-entrance conductors?
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Question 180 of 329
180. 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 181 of 329
181. Question
Calculate the total service size for the following residence, using the OPTIONAL 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
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Question 182 of 329
182. 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 __________.
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Question 183 of 329
183. Question
In a Patient Care Area, metal enclosures containing a receptacle must be connected to a(n) __________.
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Question 184 of 329
184. Question
Using the standard calculation, what is the general lighting and receptacle load (volt-amperes) for a 2000 square foot dwelling unit with 2 small appliance branch circuits and 1 laundry branch circuit.
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Question 185 of 329
185. Question
How much current would be expected to flow through a 3-phase, 208-volt, 8kW electric heater?
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Question 186 of 329
186. Question
An ohmmeter is used to measure a 120-volt rated toaster’s heating elements. The elements measure 18-ohms. How much current is expected to flow through the heating elements?
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Question 187 of 329
187. Question
The range demand load (line and neutral) for a single-family dwelling unit with 1 range rated at 12 kW is__________.
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Question 188 of 329
188. Question
The range demand load (line) for a single-family dwelling unit with one range rated at 10 KW is__________.
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Question 189 of 329
189. Question
50 feet of multi-outlet assembly is to be installed in a commercial retail store. What is the total calculated load for this assembly?
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Question 190 of 329
190. Question
How much current would be expected to flow through a 3-phase, 208-volt, 8kW electric heater?
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Question 191 of 329
191. Question
Raceways shall be used as a means of support for other raceways under which condition?
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Question 192 of 329
192. Question
Raceways shall be used as a means of support for other raceways under which condition?
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Question 193 of 329
193. 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.
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Question 194 of 329
194. Question
Type MC cable that provides an effective ground-fault current path in accordance with one or more of the following, can be used as an equipment grounding conductor:
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Question 195 of 329
195. Question
In DC electricity, electric current flows in both directions at the same time.
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Question 196 of 329
196. Question
The range demand load (line) for a single family dwelling unit with 3 ranges each rated at 9 KW is__________.
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Question 197 of 329
197. 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.
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Question 198 of 329
198. Question
In a dwelling unit, each Small Appliance Circuit Load is calculated as:
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Question 199 of 329
199. Question
Receptacles installed in a kitchen to serve countertop surfaces shall be supplied by not fewer than three small-appliance branch circuits.
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Question 200 of 329
200. Question
A concrete-encased electrode shall consist of at least 20 feet of:
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Question 201 of 329
201. Question
A 200-amp single-phase electrical service has 3 3/0 copper conductors feeing a 200-amp overcurrent device. The grounding electrode conductor for this service shall not be less than __________.
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Question 202 of 329
202. Question
Determine the conductor ampacity for a 460-V, 3-phase, 60-Hz ac feeder supplying a group of six identical elevators. The system is adjustable-speed SCR dc drive. The power transformers are external to the drive (motor controller) cabinet. Each elevator has a separate motion/operation controller connected to the load side of the main line disconnect switch rated 10 A continuous to operate microprocessors, relays, power supplies, and the elevator car door operator. Each transformer is rated 95 kVA with an efficiency of 90%.
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Question 203 of 329
203. 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 204 of 329
204. 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
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Question 205 of 329
205. Question
One or more grounding electrodes shall be permitted to be connected to the equipment grounding conductors specified in 250.118 and shall not be required to comply with the electrode bonding requirements of 250.50 or 250.53(C) or the resistance requirements of 250.53(A)(2) Exception, but the earth shall not be used as an effective ground-fault current path as specified in 250.4(A)(5) and 250.4(B)(4).
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Question 206 of 329
206. Question
A __________ is a device that transforms chemical energy into electrical energy.
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Question 207 of 329
207. 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 208 of 329
208. 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 209 of 329
209. 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 210 of 329
210. 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 211 of 329
211. Question
At least __________ receptacle(s) outlet shall be installed in bathrooms within __________ feet of the outside edge of each basin.
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Question 212 of 329
212. Question
Without applying exceptions, service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a clearance of __________ from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, or similar locations.
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Question 213 of 329
213. 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 214 of 329
214. Question
Underground raceways and cable assemblies entering a hand-hole enclosure shall extend into the enclosure, but they shall not be required to be mechanically connected to the enclosure.
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Question 215 of 329
215. Question
Underground raceways and cable assemblies entering a hand-hole enclosure shall extend into the enclosure, but they shall not be required to be mechanically connected to the enclosure.
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Question 216 of 329
216. 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 217 of 329
217. 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 218 of 329
218. 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 219 of 329
219. Question
There shall be no reduction of the neutral or grounded conductor capacity applied to the amount in 220.61(C)(1), or portion of the amount in (C)(2), from that determined by the basic calculation:
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Question 220 of 329
220. Question
For field installed neon secondary conductors over 1000 volts, the length of the secondary circuit conductors from the transformer leads to the first neon tubing electrode shall not exceed __________ where installed in metal conduit or tubing.
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Question 221 of 329
221. Question
It is appropriate to use the “optional feeder and service load calculation” method to a dwelling unit having the total connected load served by a __________ or __________ set of 3 wire service or feeder conductors with an ampacity of 100 amps or greater.
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Question 222 of 329
222. Question
A phase converter with a nameplate input rating of 100FLA, protecting a variable load, shall have overcurrent protection set at __________.
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Question 223 of 329
223. 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 224 of 329
224. Question
Sheet metal auxiliary gutters shall be supported and secured throughout their entire length at intervals not exceeding __________.
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Question 225 of 329
225. Question
For a single-family dwelling, the service disconnecting means shall have a rating of not less than __________.
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Question 226 of 329
226. 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 227 of 329
227. Question
In a separately derived system, a supply-side bonding jumper shall not be required to be larger than:
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Question 228 of 329
228. Question
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Question 229 of 329
229. 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.
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Question 230 of 329
230. Question
The service disconnecting means shall consist of not more than __________ switches or circuit breakers.
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Question 231 of 329
231. 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 __________.
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Question 232 of 329
232. 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 __________.
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Question 233 of 329
233. Question
A receptacle outlet is required at one- and two-family dwellings for the service of evaporative coolers.
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Question 234 of 329
234. Question
The SPD shall be marked with a short-circuit current rating and shall not be installed at a point on the system where the available fault current is in excess of that rating. This marking requirement shall not apply to __________.
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Question 235 of 329
235. Question
Show windows shall be calculated at __________VA per linear foot of show window.
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Question 236 of 329
236. Question
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Question 237 of 329
237. Question
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Question 238 of 329
238. 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 239 of 329
239. 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 240 of 329
240. Question
Electric currents cause __________, which creates light in incandescent light bulbs. They also create magnetic fields, which are used in motors, inductors, and generators.
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Question 241 of 329
241. Question
A single-family dwelling has a Single-Phase 125-ampere sub-panel in the garage with a main breaker in it rated at 125-amperes. What size equipment grounding conductor shall be used to feed the sub-panel?
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Question 242 of 329
242. 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
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Question 243 of 329
243. Question
An equipment grounding conductor can pass through a metal enclosure, but it must terminate to the system grounded conductor (neutral).
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Question 244 of 329
244. Question
Where __________ service disconnecting means in separate enclosures are grouped at one location and supply separate loads from one service drop, set of overhead service conductors, set of underground service conductors, or service lateral, one set of service-entrance conductors shall be permitted to supply each or several such service equipment enclosures.
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Question 245 of 329
245. 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?
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Question 246 of 329
246. 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.
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Question 247 of 329
247. 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 248 of 329
248. Question
In an installation where a rotary phase converter is present, power to the utilization equipment shall not be supplied until __________.
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Question 249 of 329
249. 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 250 of 329
250. Question
FMC shall not be used in the following:
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Question 251 of 329
251. 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 252 of 329
252. 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 253 of 329
253. 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 254 of 329
254. Question
Type ITC cable shall not be installed on circuits operating at more than __________.
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Question 255 of 329
255. Question
In a separately derived system, a supply-side bonding jumper shall not be required to be larger than:
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Question 256 of 329
256. Question
Transformers insulated with listed less-flammable liquids that have a fire point of not less than 300°C shall be permitted to be installed in Type I or Type II buildings, in areas where the transformer is rated 45,000 volts or more.
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Question 257 of 329
257. Question
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Question 258 of 329
258. Question
Current will primarily flow __________.
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Question 259 of 329
259. 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.
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Question 260 of 329
260. 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 261 of 329
261. Question
In a Major Repair Garage (where lighter-than-air gaseous fueled vehicles are repaired or stored – such as hydrogen and natural gas), the area within 18 inches of the ceiling is considered what Classification?
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Question 262 of 329
262. Question
The voltage of an AC circuit can be increased or decreased but the frequency cannot be changed.
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Question 263 of 329
263. 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 264 of 329
264. Question
Audio system equipment supplied by branch-circuit power shall not be placed horizontally within __________ of the inside wall of a pool, spa, hot tub, or fountain, or within __________ of the prevailing or tidal high water mark.
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Question 265 of 329
265. 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 266 of 329
266. Question
A Single-Phase, 3-wire 240-volt service has (2) 2/0 THHN (copper) ungrounded service entrance conductors, what is the minimum size grounding electrode conductor that must be installed?
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Question 267 of 329
267. Question
In a building in which COPS are present with other types of power systems described in other sections in this article, the cover plates for the receptacles or the receptacles themselves supplied from the COPS shall __________.
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Question 268 of 329
268. Question
Direct-buried conductors and cables emerging from the ground and up a pole shall be protected by enclosures or raceways to a point above finished grade of at LEAST __________.
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Question 269 of 329
269. Question
In a Patient Care Area, metal enclosures containing a receptacle must be connected to a(n) __________.