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325 Practice Questions for Electricians 325 Practice Questions for Electricians

325 Practice Questions for Electricians

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  1. Current
  2. Review
  3. Answered
  4. Correct
  5. Incorrect
  1. 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.

    Correct

    Incorrect

  2. 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?

    Correct

    Incorrect

  3. 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.

    Correct

    Incorrect

  4. 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.

    Correct

    Incorrect

  5. 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:

    Correct

    Incorrect

  6. 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:

    Correct

    Incorrect

  7. 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.

    Correct

    Incorrect

  8. 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.

    Correct

    Incorrect

  9. Question 9 of 329
    9. Question

    Metal cable tray can be used as an equipment grounding conductor where __________.

    Correct

    Incorrect

  10. 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.

    Correct

    Incorrect

  11. 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:

    Correct

    Incorrect

  12. 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?

    Correct

    Incorrect

  13. Question 13 of 329
    13. Question

    Cable trays used to support service entrance conductors shall contain only service entrance conductors.

    Correct

    Incorrect

  14. 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:

    Correct

    Incorrect

  15. 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:

    Correct

    Incorrect

  16. 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:

    Correct

    Incorrect

  17. 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?

    Correct

    Incorrect

  18. Question 18 of 329
    18. Question

    When installing Underground Service Conductors, all of the following are approved methods except:

    Correct

    Incorrect

  19. 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?

    Correct

    Incorrect

  20. Question 20 of 329
    20. Question

    A conducting object through which a direct connection to earth is established is termed a(n):

    Correct

    Incorrect

  21. Question 21 of 329
    21. Question

    What is the maximum allowed 1/0 AWG THHN conductors can fit in a 1 ½” EMT conduit?

    Correct

    Incorrect

  22. 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

    Correct

    Incorrect

  23. 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

    Correct

    Incorrect

  24. 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.

    Correct

    Incorrect

  25. 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?

    Correct

    Incorrect

  26. 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.

    Correct

    Incorrect

  27. Question 27 of 329
    27. Question

    Antioxidant material suitable for battery connection and termination shall be:

    Correct

    Incorrect

  28. 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?

    Correct

    Incorrect

  29. Question 29 of 329
    29. Question

    What is the maximum allowed 1/0 AWG THHN conductors can fit in a 1 ½” EMT conduit?

    Correct

    Incorrect

  30. 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?

    Correct

    Incorrect

  31. Question 31 of 329
    31. Question

    A dead end of a busway shall be __________.

    Correct

    Incorrect

  32. 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?

    Correct

    Incorrect

  33. 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 ____________.

    Correct

    Incorrect

  34. 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:

    Correct

    Incorrect

  35. 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:

    Correct

    Incorrect

  36. Question 36 of 329
    36. Question

    A dead end of a busway shall be __________.

    Correct

    Incorrect

  37. Question 37 of 329
    37. Question

    The amount of EMF surrounding a conductor __________ with a(n) __________ in current flow through the conductor.

    Correct

    Incorrect

  38. 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.

    Correct

    Incorrect

  39. Question 39 of 329
    39. Question

    The demand load for a dryer in a single-family dwelling unit, rated at 6,000 VA is __________.

    Correct

    Incorrect

  40. Question 40 of 329
    40. Question

    The demand load for the grounded conductor (neutral) for a 6,000 VA dryer is__________.

    Correct

    Incorrect

  41. 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

    Correct

    Incorrect

  42. Question 42 of 329
    42. Question

    Where used as service-entrance conductors, size 250 kcmil Type IGS cable has an allowable ampacity of __________.

    Correct

    Incorrect

  43. Question 43 of 329
    43. Question

    The ampacity of UF cable shall be that of:

    Correct

    Incorrect

  44. Question 44 of 329
    44. Question

    AFCI protection is not required in which of the following rooms in a dwelling unit?

    Correct

    Incorrect

  45. 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.

    Correct

    Incorrect

  46. Question 46 of 329
    46. Question

    Double-throw knife switches shall be permitted to be mounted so that the throw is __________.

     

    Correct

    Incorrect

  47. Question 47 of 329
    47. Question

    Double-throw knife switches shall be permitted to be mounted so that the throw is __________.

     

    Correct

    Incorrect

  48. 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

    Correct

    Incorrect

  49. Question 49 of 329
    49. Question

    Switches or circuit breakers shall not disconnect the grounded conductor of a circuit.

    Correct

    Incorrect

  50. Question 50 of 329
    50. Question

    The demand load for a dryer in a single-family dwelling unit, rated at 6,000 VA is __________.

    Correct

    Incorrect

  51. 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:

    Correct

    Incorrect

  52. 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.

    Correct

    Incorrect

  53. 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.

    Correct

    Incorrect

  54. 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.

    Correct

    Incorrect

  55. 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

    Correct

    Incorrect

  56. Question 56 of 329
    56. Question

    What is the allowable ampacity for a flexible Type-SO cord with 3 current-carrying conductors?

    Correct

    Incorrect

  57. Question 57 of 329
    57. Question

    Switches or circuit breakers shall not disconnect the grounded conductor of a circuit.

    Correct

    Incorrect

  58. 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.

    Correct

    Incorrect

  59. Question 59 of 329
    59. Question

    A receptacle outlet shall be installed at each countertop and work surface that is __________ or wider.

    Correct

    Incorrect

  60. 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.

    Correct

    Incorrect

  61. 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.

    Correct

    Incorrect

  62. 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?

    Correct

    Incorrect

  63. 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?

    Correct

    Incorrect

  64. 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)?

    Correct

    Incorrect

  65. 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.

    Correct

    Incorrect

  66. Question 66 of 329
    66. Question

    The ampacity of UF cable shall be that of:

    Correct

    Incorrect

  67. Question 67 of 329
    67. Question

    Which of these are standard ampere ratings for fuses and inverse time circuit breakers?

    Correct

    Incorrect

  68. Question 68 of 329
    68. Question

    Which of these are standard ampere ratings for fuses and inverse time circuit breakers?

    Correct

    Incorrect

  69. 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.

    Correct

    Incorrect

  70. Question 70 of 329
    70. Question

    The Full-Load Current of a 3-phase 230-volt 5-HP AC wound-rotor motor is __________.

    Correct

    Incorrect

  71. Question 71 of 329
    71. Question

    What is the full-load current of a 100-HP 500-volt Direct-Current motor?

    Correct

    Incorrect

  72. 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.

    Correct

    Incorrect

  73. Question 73 of 329
    73. Question

    Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are:

    Correct

    Incorrect

  74. 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:

    Correct

    Incorrect

  75. 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.

    Correct

    Incorrect

  76. Question 76 of 329
    76. Question

    The minimum size service conductors for a 200 Amp service in a single-family dwelling unit is__________.

    Correct

    Incorrect

  77. 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.

    Correct

    Incorrect

  78. 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?

    Correct

    Incorrect

  79. 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)?

    Correct

    Incorrect

  80. 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.

    Correct

    Incorrect

  81. 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?

    Correct

    Incorrect

  82. 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.

    Correct

    Incorrect

  83. 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 __________.

    Correct

    Incorrect

  84. 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 __________.

    Correct

    Incorrect

  85. 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.

    Correct

    Incorrect

  86. 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.

    Correct

    Incorrect

  87. 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.

    Correct

    Incorrect

  88. 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?

    Correct

    Incorrect

  89. 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.

    Correct

    Incorrect

  90. 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 __________.

    Correct

    Incorrect

  91. 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

    Correct

    Incorrect

  92. 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

    Correct

    Incorrect

  93. 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.

    Correct

    Incorrect

  94. 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.

    Correct

    Incorrect

  95. Question 95 of 329
    95. Question

    What is the full-load current of a 100-HP 500-volt Direct-Current motor?

    Correct

    Incorrect

  96. 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.

    Correct

    Incorrect

  97. 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.

    Correct

    Incorrect

  98. 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.

    Correct

    Incorrect

  99. 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.

    Correct

    Incorrect

  100. 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:

    Correct

    Incorrect

  101. Question 101 of 329
    101. Question

    What is the line demand load for a dryer with a nameplate rating of 4,800 VA.

    Correct

    Incorrect

  102. 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.

    Correct

    Incorrect

  103. 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?

    Correct

    Incorrect

  104. 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.

    Correct

    Incorrect

  105. 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?

    Correct

    Incorrect

  106. 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?

    Correct

    Incorrect

  107. 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:

    Correct

    Incorrect

  108. 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:

    Correct

    Incorrect

  109. 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?

    Correct

    Incorrect

  110. 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 __________.

    Correct

    Incorrect

  111. Question 111 of 329
    111. Question
    1. 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__________.

    Correct

    Incorrect

  112. 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.

    Correct

    Incorrect

  113. Question 113 of 329
    113. Question

    Fixed electric space heating equipment and motors shall be considered what type of load?

    Correct

    Incorrect

  114. Question 114 of 329
    114. Question

    Fixed electric space heating equipment and motors shall be considered what type of load?

    Correct

    Incorrect

  115. Question 115 of 329
    115. Question

    Impedance includes the following:

    Correct

    Incorrect

  116. 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.

    Correct

    Incorrect

  117. 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.

    Correct

    Incorrect

  118. 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 __________.

    Correct

    Incorrect

  119. 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.

    Correct

    Incorrect

  120. Question 120 of 329
    120. Question

    The distance outward that an expanding and collapsing electromagnetic field around a conductor can reach, is __________.

    Correct

    Incorrect

  121. 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

    Correct

    Incorrect

  122. 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

    Correct

    Incorrect

  123. Question 123 of 329
    123. Question

    A receptacle outlet shall be installed at each countertop and work surface that is __________ or wider.

    Correct

    Incorrect

  124. 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.

    Correct

    Incorrect

  125. 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.

    Correct

    Incorrect

  126. 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.

    Correct

    Incorrect

  127. 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.

    Correct

    Incorrect

  128. 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

    Correct

    Incorrect

  129. 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 __________.

    Correct

    Incorrect

  130. Question 130 of 329
    130. Question

    The minimum size service conductors (AL) for a 150 Amp service in a single-family dwelling unit is __________.

    Correct

    Incorrect

  131. Question 131 of 329
    131. Question

    Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are:

    Correct

    Incorrect

  132. Question 132 of 329
    132. Question

    A 1/0 copper grounding electrode conductor is appropriate for what size ungrounded service-entrance conductors?

    Correct

    Incorrect

  133. 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.

    Correct

    Incorrect

  134. 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?

    Correct

    Incorrect

  135. 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.

    Correct

    Incorrect

  136. 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.

    Correct

    Incorrect

  137. 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)?

    Correct

    Incorrect

  138. 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:

    Correct

    Incorrect

  139. 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:

    Correct

    Incorrect

  140. 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:

    Correct

    Incorrect

  141. 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:

    Correct

    Incorrect

  142. 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:

    Correct

    Incorrect

  143. 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?

    Correct

    Incorrect

  144. 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

    Correct

    Incorrect

  145. 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 __________.

    Correct

    Incorrect

  146. 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 __________.

    Correct

    Incorrect

  147. 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?

    Correct

    Incorrect

  148. 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.

    Correct

    Incorrect

  149. Question 149 of 329
    149. Question

    Which of the following are not sources of magnetism that can be derived electrically?

    Correct

    Incorrect

  150. 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.

    Correct

    Incorrect

  151. 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.

    Correct

    Incorrect

  152. 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 __________.

    Correct

    Incorrect

  153. 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__________.

    Correct

    Incorrect

  154. 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:

    1. 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

    2. 220.61(C)(2)

      That portion consisting of nonlinear loads supplied from a 4-wire, wye-connected, 3-phase system

    Correct

    Incorrect

  155. 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?

     

    Correct

    Incorrect

  156. 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?

     

    Correct

    Incorrect

  157. 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.

    Correct

    Incorrect

  158. 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?

    Correct

    Incorrect

  159. 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?

    Correct

    Incorrect

  160. Question 160 of 329
    160. Question

    The following methods are approved for outside branch circuits and feeders installed on buildings or other structures except:

    Correct

    Incorrect

  161. 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.

    Correct

    Incorrect

  162. 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 __________.

    Correct

    Incorrect

  163. 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

    Correct

    Incorrect

  164. 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.

    Correct

    Incorrect

  165. Question 165 of 329
    165. Question

    What is the total resistance of three 15-ohm resistors connected in parallel?

    Correct

    Incorrect

  166. 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.

    Correct

    Incorrect

  167. Question 167 of 329
    167. Question

    __________ percent of the peak voltage is the effective voltage.

    Correct

    Incorrect

  168. Question 168 of 329
    168. Question

    Excluding exceptions, what is the minimum size of Overhead Service Conductors?

    Correct

    Incorrect

  169. 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 __________.

    Correct

    Incorrect

  170. 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.

    Correct

    Incorrect

  171. 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?

    Correct

    Incorrect

  172. Question 172 of 329
    172. Question

    Which of these are “standard sizes” for fuses, in regards to the National Electrical Code?

    Correct

    Incorrect

  173. Question 173 of 329
    173. Question

    A bare #4 AWG copper conductor has a diameter of __________.

    Correct

    Incorrect

  174. Question 174 of 329
    174. Question

    The Full-Load Current of a 3-phase 230-volt 5-HP AC wound-rotor motor is __________.

    Correct

    Incorrect

  175. Question 175 of 329
    175. Question

    A 60 cycle-per-second waveform changes direction __________ times per second.

    Correct

    Incorrect

  176. 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.

    Correct

    Incorrect

  177. 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.

    Correct

    Incorrect

  178. 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.

    Correct

    Incorrect

  179. Question 179 of 329
    179. Question

    A 1/0 copper grounding electrode conductor is appropriate for what size ungrounded service-entrance conductors?

    Correct

    Incorrect

  180. 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__________.

    Correct

    Incorrect

  181. 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

    Correct

    Incorrect

  182. 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 __________.

    Correct

    Incorrect

  183. Question 183 of 329
    183. Question

    In a Patient Care Area, metal enclosures containing a receptacle must be connected to a(n) __________.

    Correct

    Incorrect

  184. 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.

    Correct

    Incorrect

  185. Question 185 of 329
    185. Question

    How much current would be expected to flow through a 3-phase, 208-volt, 8kW electric heater?

    Correct

    Incorrect

  186. 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?

    Correct

    Incorrect

  187. 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__________.

    Correct

    Incorrect

  188. 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__________.

    Correct

    Incorrect

  189. 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?

    Correct

    Incorrect

  190. Question 190 of 329
    190. Question

    How much current would be expected to flow through a 3-phase, 208-volt, 8kW electric heater?

    Correct

    Incorrect

  191. Question 191 of 329
    191. Question

    Raceways shall be used as a means of support for other raceways under which condition?

    Correct

    Incorrect

  192. Question 192 of 329
    192. Question

    Raceways shall be used as a means of support for other raceways under which condition?

    Correct

    Incorrect

  193. 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.

    Correct

    Incorrect

  194. 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:

    Correct

    Incorrect

  195. Question 195 of 329
    195. Question

    In DC electricity, electric current flows in both directions at the same time.

    Correct

    Incorrect

  196. 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__________.

    Correct

    Incorrect

  197. 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.

    Correct

    Incorrect

  198. Question 198 of 329
    198. Question

    In a dwelling unit, each Small Appliance Circuit Load is calculated as:

    Correct

    Incorrect

  199. 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.

    Correct

    Incorrect

  200. Question 200 of 329
    200. Question

    A concrete-encased electrode shall consist of at least 20 feet of:

    Correct

    Incorrect

  201. 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 __________.

    Correct

    Incorrect

  202. 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%.

    Correct

    Incorrect

  203. 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?

    Correct

    Incorrect

  204. 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

    Correct

    Incorrect

  205. 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).

    Correct

    Incorrect

  206. Question 206 of 329
    206. Question

    A __________ is a device that transforms chemical energy into electrical energy.

    Correct

    Incorrect

  207. 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:

    Correct

    Incorrect

  208. 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?

    Correct

    Incorrect

  209. 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 __________:

    Correct

    Incorrect

  210. 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 __________.

    Correct

    Incorrect

  211. 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.

    Correct

    Incorrect

  212. 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.

    Correct

    Incorrect

  213. 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:

    Correct

    Incorrect

  214. 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.

    Correct

    Incorrect

  215. 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.

    Correct

    Incorrect

  216. 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:

    Correct

    Incorrect

  217. 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.

    Correct

    Incorrect

  218. 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 __________.

    Correct

    Incorrect

  219. 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:

    Correct

    Incorrect

  220. 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.

    Correct

    Incorrect

  221. 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.

    Correct

    Incorrect

  222. 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 __________.

    Correct

    Incorrect

  223. 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.

    Correct

    Incorrect

  224. Question 224 of 329
    224. Question

    Sheet metal auxiliary gutters shall be supported and secured throughout their entire length at intervals not exceeding __________.

     

    Correct

    Incorrect

  225. Question 225 of 329
    225. Question

    For a single-family dwelling, the service disconnecting means shall have a rating of not less than __________.

    Correct

    Incorrect

  226. 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:

    Correct

    Incorrect

  227. Question 227 of 329
    227. Question

    In a separately derived system, a supply-side bonding jumper shall not be required to be larger than:

    Correct

    Incorrect

  228. Question 228 of 329
    228. Question

    Correct

    Incorrect

  229. 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.

    Correct

    Incorrect

  230. Question 230 of 329
    230. Question

    The service disconnecting means shall consist of not more than __________ switches or circuit breakers.

    Correct

    Incorrect

  231. 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 __________.

    Correct

    Incorrect

  232. 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 __________.

    Correct

    Incorrect

  233. Question 233 of 329
    233. Question

    A receptacle outlet is required at one- and two-family dwellings for the service of evaporative coolers.

    Correct

    Incorrect

  234. 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 __________.

    Correct

    Incorrect

  235. Question 235 of 329
    235. Question

    Show windows shall be calculated at __________VA per linear foot of show window.

    Correct

    Incorrect

  236. Question 236 of 329
    236. Question

    Correct

    Incorrect

  237. Question 237 of 329
    237. Question

    Correct

    Incorrect

  238. 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 __________.

    Correct

    Incorrect

  239. 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.

    Correct

    Incorrect

  240. 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.

    Correct

    Incorrect

  241. 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?

    Correct

    Incorrect

  242. 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

    Correct

    Incorrect

  243. 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).

    Correct

    Incorrect

  244. 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.

    Correct

    Incorrect

  245. 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?

    Correct

    Incorrect

  246. 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.

    Correct

    Incorrect

  247. 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.

    Correct

    Incorrect

  248. 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 __________.

    Correct

    Incorrect

  249. 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:

    Correct

    Incorrect

  250. Question 250 of 329
    250. Question

    FMC shall not be used in the following:

    Correct

    Incorrect

  251. 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:

    Correct

    Incorrect

  252. 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.

    Correct

    Incorrect

  253. 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:

    Correct

    Incorrect

  254. Question 254 of 329
    254. Question

    Type ITC cable shall not be installed on circuits operating at more than __________.

    Correct

    Incorrect

  255. Question 255 of 329
    255. Question

    In a separately derived system, a supply-side bonding jumper shall not be required to be larger than:

    Correct

    Incorrect

  256. 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.

    Correct

    Incorrect

  257. Question 257 of 329
    257. Question

    Correct

    Incorrect

  258. Question 258 of 329
    258. Question

    Current will primarily flow __________.

    Correct

    Incorrect

  259. 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.

    Correct

    Incorrect

  260. 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?

    Correct

    Incorrect

  261. 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?

    Correct

    Incorrect

  262. Question 262 of 329
    262. Question

    The voltage of an AC circuit can be increased or decreased but the frequency cannot be changed.

    Correct

    Incorrect

  263. 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?

    Correct

    Incorrect

  264. 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.

    Correct

    Incorrect

  265. 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.

     

    Correct

    Incorrect

  266. 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?

    Correct

    Incorrect

  267. 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 __________.

    Correct

    Incorrect

  268. 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 __________.

    Correct

    Incorrect

  269. Question 269 of 329
    269. Question

    In a Patient Care Area, metal enclosures containing a receptacle must be connected to a(n) __________.