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241 True/False questions

  1. (310) On a 4 wire-3-phase wye circuit, where the major portion of the load consists of electrical discharge lighting, data processing equipment , or other harmonic current inducting loads, the neutral conductor shall be counted when applying Section 310-15(b)(2) adjustment factors.(True/False)True

          

  2. (310) TFE-insulated conductors are manufactured in sizes from No. 14 through No. _____..82

          

  3. Conductor Insulation Properties: Table _____ of the NEC provides information on conductor properties such as permitted use, maximum operating temperature and other insulation details.310.104(a)

          

  4. (250-146(A)) Equipment bonding jumper shall be used to connect the grounding terminal of a grounding-type receptacle to a grounded box. Where the box is surface mounted, direct metal to metal contact between the device yoke and the box shall be permitted to ground the receptacle to the box.(True/False)60

          

  5. (310-15(B)(2)(A)) In designing circuits, the current-carrying capacity of conductors should be corrected for heat at room temperatures above ______ degrees F.86

          

  6. (250-94, bonding of other systems) An accessible point must be available for bonding of communications systems to the building grounding electrode. This Section requires the accessible bonding point to be exposed metallic service raceways, exposed grounding electrode conductor, or 6 inches of No. 6 copper conductor connected to the service equipment or raceway(True/False)Permitted

          

  7. (360-10) Flexible metallic tubing shall be permitted to be used _____.For a maximum of 1000 volts

          

  8. Conductors in Parallel: If we have an 800 ampere service with a calculated demand load of 750 ampere, what size 75 degree C conductors would be required if parallel in two raceways?130 ampere

          

  9. Terminal Rating(110-14(C)(1): What is the minimum size THHN conductor that is permitted to terminate on a 70 ampere circuit breaker or fuse? Be sure to comply with the requirements of Section 110-14(c)(1)4

          

  10. (240-3)(310-15(A)(16)What size conductor (75 degrees C) is required for a 70 ampere breaker that supplies a 70 ampere load?No. 4

          

  11. 352-10(F)) Rigid nonmetallic conduit can be installed exposed in buildings _____.Of any height

          

  12. (590-3(D)) Temporary wiring must be _____ immediately upon the completion of the purpose for which it was installed.Removed

          

  13. (372-13) When an outlet is discontinued, abandoned or removed from a cellular concrete floor raceway, the sections of circuit conductors supplying the outlet shall be removed from the raceway.(True/False)True

          

  14. (398-19) Open conductors shall be separated at least ______ inches from metal raceways, piping, or other conducting material, and from any exposed lighting, power, or signaling conductor, or shall be separated by a continuous and firmly fixed nonconductor in addition to the nsulation of the conductor.2

          

  15. (398-2) Open wiring on insulators is a(n) _____ wiring method using cleats, knobs, tubes, and flexible tubing for the protection and support of single insulated conductors run in or on buildings, and not concealed by the building structure.In groups consisting of not more than one conductor per phase or neutral

          

  16. (368-12(2)) In general, the voltage limitation between conductors in a surface metal raceway shall not exceed _____ volts unless the metal has a thickness listed for higher voltage.1/0

          

  17. What size THHN conductor is required for a 50 ampere circuit, listed for use at 75 degrees C?12

          

  18. (240)(240-6(A)) Standard sized circuit breakers and fuses include 25, 90, and 350 ampere.(True/False)False

          

  19. (280-12)The conductor used to connect the surge arrester to _____ shall not be any longer than necessary.Ground

          

  20. When selecting a conductor for a circuit, always select the conductors not smaller than the _______ of the equipment.Terminal ratings

          

  21. (354-28) For ______, nonmetallic underground conduit with conductors shall be trimmed away from the conductors or cables using an approved method that will not damage the conductor or cable insulation or jacket.20

          

  22. (390-8) When an outlet from an underfloor raceway is discontinued, the circuit conductors supplying the outlet _____.True

          

  23. (310-15(3)) Where conductors of different insulation are associated together, the limiting temperature of any conductor shall not be exceeded.(True/False)True

          

  24. (390-4(b))Underfloor raceways spaced less than 1 inch apart shall be covered with concrete to a depth of _____ inches.1 ½

          

  25. The ampacity of 10 current-carrying No. 6 THHW conductors installed in an 18 inch long raceway with an ambient temperature of 39C is ____.68 amperes

          

  26. (362-2) Electrical nonmetallic tubing is composed of a material that is resistant to moisture, chemical atmospheres, and is ______.Encased and embedded

          

  27. (Table 310-15(a)(16)): The ampacities in Table 310-15(a)(16) apply ony when the ambient temperature is 40 C and there are no more than two current-carrying conductors bundled together. If the ambient temperature is not 40 C or there are more than two current-carrying conductors in a raceway, the allowable ampacities must be adjusted to reflect the ampacity under the condition of use.(True/False)True

          

  28. To find the correction factor for situation where four or more current carrying conductors are bundled together, consult Table _____.310.15(B)(2)(a)

          

  29. What size THHN conductor is required to supply a 225 ampere feeder?4/0

          

  30. The smallest size conductor permitted by the NEC for branch circuits, feeders or services is _____ copper or _____ aluminum.130 ampere

          

  31. If the overcurrent protection device is over 800 ampere, the circuit conductor ampacity must not be ____ than the rating of the overcurrent protection device.Less

          

  32. Voltage drop considerations are for ________ and not for safety; therefore, sizing conductors for voltage drop is not a Code requirement.4/0

          

  33. (Table 310-15(a)(16)): What size conductor is required to feed a 16 ampere load when the conductors are in an ambient temperature of 100F? The circuit is protected with a 20-ampere overcurrent protection device.No. 12 THHN

          

  34. (300-22(B)) Wiring methods permitted in ducts or plenums used for environmental air include _______.True

          

  35. Motor: What size branch circuit conductor and short-circuit protection is required for a 2 horsepower (12 ampere) motor rated 230 volts?(240-6(a), 430-52(b))are

          

  36. (300-21) Electrical installations in hollow spaces, vertical shafts, and ventilation or air handling ducts shall be so made that the possible spread of fire or products of combustion will not be ______.Substantially increased

          

  37. (372-2)In cellular concrete floor raceways, a "cell" shall be defined as a single, enclosed _____ space in a floor made of precast cellular concrete slabs, the direction of the cell being parallel to the direction of the floor member.True

          

  38. (310-15(A)(16) A No. 2 TW conductor is installed in a location where the ambient temperature is expected to be 102F. The temperature correction factor for conductor ampacity in this location is _____..82

          

  39. TFFN can be described as stranded fixture wire with thermoplastic insulation, nylon cover. (True/False)True

          

  40. Current Carrying Conductors(310-15(B)(5) : The neutral conductor of a balanced 3-wire delta circuit, or 4 wire wye circuit is considered a current-carrying conductor for the purpose of applying the derating factors in Table 310-15(b)(2a).80

          

  41. (Table 250-122) What is the minimum size equipment grounding conductor required for equipment connected to a 40 ampere rated circuit?136 amperes

          

  42. (300-4(b)(1)) Where nonmetallic sheathed cables pass through cut or drilled slots or holes in metal members, the cable needs to be protected by bushings or grommets securely covering all metal edges fastened in the opening prior to installation of the cable.(True/False)3-No.8 AWG

          

  43. Terminal Rating(110-14(C)(1): What size THHN conductor is required for an air-conditioning unit if the nameplate requires a conductor ampacity of 34 ampere? Terminals of all the equipment and circuit breakers are rated 75 degrees C.No. 10

          

  44. Parallel conductors (electrically joined at both ends) permit a smaller ________ per ampere. This can result in a significant cost savings for circuits over 300 amperes.Cross-sectional area

          

  45. (590-6(A)(1)) All 125 volt single phase 15, 20 and 30 ampere receptacle outlets in use by personnel for temporary power shall have ground-fault circuit-interrupter protection for personnel.(True/False)No. 6

          

  46. What is the ampacity of No. 12 THHN when installed in a walk in cooler that has an ambient temperature of 50 degrees F? (310.15(B)(2)(a)53.25 ampere

          

  47. (358-26) A run of electrical metallic tubing between outlet boxes shall not exceed _____ close to the box.Outside

          

  48. (300-16(B)) A bushing can be used instead of a box where conductors emerge from a raceway and enter or terminate at equipment such as switchboards, unenclosed control equipment, or similar equipment.(True/False)True

          

  49. Conductor Sizing(310-106(a): The smallest size conductor permitted for branch circuits, feeders, and services for residential, commercial, and industrial locations is _____.No. 4/0

          

  50. (310) Where six current-carrying conductors are run in the same conduit or cable, the ampacity of each conductor shall be adjusted by a factor of _____ percent.No. 8 THHN

          

  51. (350-30(A)) Liquidtight flexible conduit where used as a fixed raceway, must be secured within _____ inches(es) on each side of the box and at intervals not exceeding _____ feet.6

          

  52. (250) A service that contains No. 12 service-entrance conductors, shall require a No. _____ grounding electrode conductor.8

          

  53. What is the ampacity of No. 6 THHN when installed on a roof that has an ambient temperature of 60 degrees C?(310.15(B)(2)(a)53.25 ampere

          

  54. (300-5(D)(1)) Where underground conductors and cables emerge from underground, they shall be protected to a point ____ feet above finished grade. In no case shall the protection be required to exceed 18 inches below grade.8

          

  55. (358-2(A)(B)) The minimum and maximum size of EMT is _____ inches, except for special installations.Ground

          

  56. (370-2) Cablebus is ordinarily assembled at the _____.Point of installation

          

  57. (Table 352-30) 1 inch rigid nonmetallic conduit must be supported every _____ feet.3

          

  58. The minimum interruption rating is _____ ampere for circuit breakers and _____ ampere for fuses.Exploding

          

  59. (332-100) Flat cable assembly shall consist of 2, 3 or 4 conductors.(True/False)Dead ends

          

  60. A raceway contains the following: One 4-wire multiwire branch circuit that supplies a balanced incandescent 120 volt lighting load; one 4-wire multiwire branch circuit that supplies a balanced 120 volt fluorescent lighting load; two conductors that supply a receptacle; and there is one equipment grounding conductor. The system is 3-phase 208Y/120 volts. Taking all these factors into consideration, how many of these conductors are considered current carrying?9

          

  61. The grounded neutral of a balanced 3-wire delta circuit or balance 4 wire wye circuit (is)(is not) considered a current carrying conductor.Is

          

  62. (Table 314-16) According to the NEC, the volume of a 3 inch x 2 inch 2 inch device box is _____ cubic inches.57 amperes

          

  63. (330-30(B)) Type MC cable shall be supported and secured at intervals not exceeding _____ feet.Completed

          

  64. (334-10) Type NM, Type NMC cables shall be permitted to be used in one and two family dwellings.(True/False)Bonded

          

  65. (368-10) It is permissible to run unbroken lengths of surface metal raceways through dry walls, partitions, or floors.(True/False)10

          

  66. (250-122(c)) Where a single equipment grounding conductor is used for multiple circuits in the same raceway, the single equipment grounding conductor must be sized according to _____.the largest overcurrent device protecting conductors in the raceway

          

  67. (250-119) The equipment grounding conductor shall be identified by a continuous outer green finish, being bare, or a continuous outer green finish with one or more yellow stripes.(True/False)80

          

  68. (110-14(c)(1) )What size THHN conductor is required for a 50 ampere circuit, listed for use at 60 degrees C?No. 4

          

  69. (240) One of the purposes of conductor overcurrent protection is to protect the conductors against excessive or dangerous heat.(True/False)True

          

  70. Terminal Rating(110-14(C)(1): Terminals for equipment rated over 100 ampere and pressure connector terminals for conductors larger than No. 1 shall have the conductor sized according to 75 degree C temperature rating as listed in Table 310-15(a)(16)(True/False)True

          

  71. (300-14) An 8" x 8" x 4" deep junction/splice box would only require 6 inches of free conductor measured from the point in the box where the conductors enter the enclosure. The 3 inch outside the box rule _____ apply.True

          

  72. (250-148) Where there are multiple equipment grounding conductors present in a receptacle outlet box, all equipment grounding conductors must be spliced and a pigtail brought out for the receptacle.the largest overcurrent device protecting conductors in the raceway

          

  73. Conductors in Parallel: (310-10(H)(5)(250-122(F) When equipment grounding conductors are installed in parallel, each raceway must have a full-size equipment grounding conductor sized according to the overcurrent protection device rating of that circuit.(True/False)True

          

  74. The grounded neutral of a balanced 3 wire wye circuit (is)(is not) considered a current carrying conductor.Is

          

  75. Conductors in Paralle (310-10(H)(3)l: Paralleling of conductors is done by sets.(True/False)False

          

  76. When equipment grounding conductors are installed with circuit conductors that are run in parallel, each raceway must have an equipment grounding conductor sized according to the overcurrent protection device protecting the circuit.(True/False)No. 1

          

  77. (310-106(C)) Where installed in raceways, conductors No. _____ and larger shall be stranded.Three or more flat

          

  78. Conductor Sizing(110-6): Conductor sizes are expressed in Amercan Wire Gauge (AWG) from No. 40 through No. 4/0. Conductors larger than _____ are expressed in circular mils.4/0

          

  79. Terminal Rating: In general, THHN (90 degrees C) conductor ampacities cannot be used when sizing conductors; but when more than three current-carrying conductors are bundled together, or if the ambient temperature is greater than 86 degrees F, the allowable conductor ampacity must be decreased. THHN offers the opportunity of having a greater ampacity for conductor derating purposes, thereby permitting the same conductor to be used without having to increase the conductor size.(True/False)No. 1/0

          

  80. Terminal Rating(110-14(C)(1): What size THHN conductor is required for a 70 ampere branch circuit if the circuit breaker and equipment is listed for 75 degrees C terminals and the load does not exceed 65 ampere?No. 6

          

  81. (300-22C) The space above a dropped ceiling used for environmental air is considered as _____ and the wiring limitations of Section _____ apply.Other spaces, 300-22(c)

          

  82. Ambient temperature Derating Factor: Conductor ampacity adjustment does not apply if the different ambient is 10 feet or less and does not exceed -___ percent of the total length of the conductor.(310-15(a)(2)exception10

          

  83. (344-10(B)(1)) Rigid metal conduit shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by ____ and judged suitable for the condition.Of any height

          

  84. Conductors in Parallel(310-10(H)(1)(Table 250-122): What size equipment grounding conductor is required in each raceway for an 800 ampere, 500 kcmil feeder parallel in two raceways?600

          

  85. (Table 310-15(b)(3a)): What is the ampacity for four No. 1/0 THHN conductors?57 amperes

          

  86. (250-68(B)) The connections (attachment) of the grounding electrode conductor to a grounding electrode shall be made in a manner that will ensure a permanent and effective _____.bonded.

          

  87. (382-2) The classification of nonmetallic extensions includes surface extensions intended for mounting directly to the surface of walls and surface extensions intended for mounting directly on the surface of ceilings. (True/False)True

          

  88. (310-10(H)(1)) In general, the minimum size phase, neutral or grounded conductor permitted for use in parallel is No. ___.1/0

          

  89. (250-70) The connection of the grounding electrode conductor to a buried grounding electrode (driven ground rod) shall be made with a listed terminal device that is _____.Table 250-122

          

  90. Ambient Temperature and Conductor Bundling Derating Factors: What is the ampacity of eight current-carrying No. 10 THHN conductors installed in ambient temperature of 100F?26 ampere

          

  91. Current Carrying Conductors(310-15(B)(5): The neutral conductor of a balanced 3-wire wye circuit is not considered a current-carrying conductor for the purpose of applying bundle adjustment factors.(True/False)False

          

  92. The ampacities listed in Table 310.15(b)(16) are based on temperature alone and do not take _____ into account.Voltage drop

          

  93. (310-60(A)) Thermal resistivety is the reciprocal of thermal conductivity; it is designated Rho and expressed in units of ______.Listed

          

  94. (320-15) Although exposed Type AC cable is required to closely follow the surface of the building, it can be used on the underside of floor joists in basements where supported at each joist where not subject to damage.(True/False)True

          

  95. (334-17) Nonmetallic sheathed cables run through framing members are considered to be adequately supported.(True/False)True

          

  96. Continuous Load Protection: Overcurrent protections devices are sized at no less than ____ percent of the continuous load, plus _____ percent of the noncontinuous load.125, 100

          

  97. (Table 392-60(A) (b)) Steel cable trays shall not be used as equipment grounding conductors for circuits with ground-fault protection above _____ amperes.600

          

  98. (382-30(A)) Nonmetallic extensions shall be secured in place by approved means at intervals not exceeding _____ inches.8

          

  99. (352-100) Rigid nonmetallic conduit and fittings used above ground shall be resistant to moisture and chemical atmospheres, low temperatures and sunlight and distortion from heat.(True/False)Encased and embedded

          

  100. (362-28) All cut ends of electrical nonmetallic tubing shall be trimmed inside and ____ to remove rough edges.Outside

          

  101. (342-10(D)) Materials such as straps, bolts, screws, etc., associated with the installation of intermediate metal conduit in concrete, in direct contact with the earth are required to be ______.Corrosion resistant.

          

  102. There is a total of nine No. 10 THW conductors in a raceway. The system voltage is 3-phase, 208Y/120 Volts. One conductor is an equipment grounding conductor; four conductors supply a 4 wire multiwire branch circuit for balanced electric-discharge lighting, and the remaining conductors supply a 4-wire multiwire branch circuit for balanced incandescent lighting. Taking all of these factors into consideration, how many of these conductors are considered current-carrying?34.5 ampere

          

  103. (590-4(E)) Multiwire branch circuits for temporary wiring shall be provided with a means to disconnect simultaneously all _____ conductors at the power outlet or panelboard where the branch circuit originated.Ungrounded

          

  104. (338-10(B)(4)(b)) requirements of Article 334-30 the cable shall be secured within ____ inches of termination and 4 ½ feet, and when installed underground the cable shall comply with the underground requirements in Article 339 - Underground Feeder Cable.12

          

  105. (315-15(B)(3a) The ampacity of six current-carrying No. 4/0 XHHW aluminum conductors installed in a ground floor slab (wet location) is _____.16 ampere

          

  106. Ampere interrupting current (AIC) is for short circuit faults. They are meant to protect a device from _______ while trying to clear a fault.Exploding

          

  107. (362-46) Bushings or adapters are required at electrical nonmetallic tubing terminations to protect the conductors from abrasion.(True/False)Outside

          

  108. (334-80) The ampacity of nonmetallic sheath cable shall be hat of 60 C as listed in Table 310-15(A)(16). However the 90 C ampacity listed in Table 310-15(A)(16) can be used for ampacity adjustment purposes, provided the final adjusted ampacity does not exceed that of a _____ rated conductor.Close-fitting

          

  109. Conductor bundle ampacity adjustment does ot apply to conductors that are in a conduit that does not exceed _____ inches in length.24

          

  110. (374-2)A _____ is defined as a single enclosed tubular space in a cellular metal floor member.True

          

  111. (332-40(B)) Where MI cable terminates, a _____ shall be provided immediately after stripping to prevent the entrance of moisture into the insulation.Seal

          

  112. (372-6)Connections from cellular concrete floor raceway headers to cabinets shall be made by means of listed metal raceways or PVC raceways.(True/False)Flame-retardant

          

  113. (324-56(B)) Each FCC transition assembly shall incorporate means for facilitating the entry of the type FCC cable into the assembly; connecting the Type FCC cable to grounded conductors; and electrically connecting the assembly to the metal cable shields and grounding conductors.(True/False)Dead ends

          

  114. (250-86) Metal enclosures for conductors added to existing installations of nonmetallic sheathed cable, knob and tube wiring, or open wiring, which do not provide an equipment ground, are not required to be grounded if they are less than25 feet long free from probable contact with grounded conductive material.(True/False)26 ampere

          

  115. (344-42(A)) Where threadless couplings and connectors used with rigid metal conduit are buried in masonry or concrete, they shall be of the_____ type.Concrete-tight

          

  116. (300-18(A)) The NEC permits prewired raceway assemblies where specifically permitted elsewhere in the Code.(True/False)A ¼ inch air space

          

  117. (392-12) Cable tray systems shall not be used in hoistways or _______.Where subject to physical damage.

          

  118. (332-40(D)) All extensions from flat cable assemblies shall be made by approved wiring methods, within the _____, installed at either end of the flat cable assembly runs.8

          

  119. (110-14(c)(1) ) Equipment rated at 100 ampere or less shall have the conductor sized no smaller than _____ degrees C unless the terminals are marked otherwise.60

          

  120. (Table 310-15(b)(3a)): When four or more current-carrying conductors are bundled together for more than _____, the conductor allowable ampacity must be reduced according to the factors listed in Table 310-15(b)(3a).24 inches

          

  121. (340-10) Type UF cable is permitted for interior use, wet locations, or for direct burial.(True/False)Three or more flat

          

  122. If the ambient temperature is different than 86 degrees F (30 degrees C) AND there are more than three conductors in a conduit or cable, You must multiply by both the temperature correction factor and the bundle adjustment factor(True/False)True

          

  123. (382-56) Receptacle type tap connectors for nonmetallic extensions shall be of the _____.Outside

          

  124. (370-3) Cablebus framework, where _____, shall be permitted as the equipment grounding conductor for branch circuits and feeders.Bonded

          

  125. (250-96(b)) Where required for the reduction of electric noise for electronic equipment, electrical continuity of metal raceway is not required, and the metal raceway can terminate to a(n) ______ nonmetallic fittings(s)or spacer on the electronic equipment.True

          

  126. (348) The maximum run length of 3/8 inch flexible metal conduit for any circuit is_____ feet.True

          

  127. (Table 310-15(a)(16)):What is the ampacity of No. 8 THHN conductors when installed in a walk in cooler if the ambient temperature is 50F?57 amperes

          

  128. (362-10(6) Electrical nonmetallic tubing and fittings shall be permitted to be _____ in a concrete slab on grade where the tubing is placed upon sand or approved screenings.True

          

  129. Conductor Size: What size conductor is required to supply a 40 ampere load? The conductors pass through a room where the ambient temperature s 100 degrees F. (310.15(B)(2)(a)No. 3/0

          

  130. (240) A continuous load of 27 ampere requires the circuit overcurrent protection device to be sized at _____ ampere.35

          

  131. (590-4(J)) Cable assemblies, as well as flexible cords and cables, shall be supported at intervals that ensure protection from physical damage. Support shall be in the form of staples, cable ties, straps or similar fittings designed as not to damage the cable or cord assembly.(True/False)True

          

  132. (320-15) Where armor cable is run on the side of rafters, studs, or floor joists in an accessible attic, protection is required for the cable with running boards.(True/False)False

          

  133. (110-14(c)(2) )Terminals for equipment rated over 100 ampere and pressure connector terminals for conductors larger than No. 1 shall have the conductor sized according to the _____ temperature rating listed in Table 310.15(B)(16)75 degree

          

  134. (250-104(A)(1)) A building or structure, which is supplied by a feeder, must have the interior metal water piping system bonded with a conductor sized from _____.Table 250-66

          

  135. What size conductors(2) would be required in one raceway (nipple) for a 600 ampere service? The calculated demand load is 550 ampere.No. 1

          

  136. (250-146) An _____ shall be used to connect the grounding terminal of a grounding - type receptacle to a grounded box.True

          

  137. (250-164(A)) DC systems to be grounded and supplied from an off premises source shall have the grounding connection made at _____.One of more supply stations

          

  138. (350-10) The use of listed and marked liquidtight flexible metal conduit shall be permitted for direct burial where listed and marked for the purpose, exposed work, and concealed work.(True/False)True

          

  139. Conductor Allowable Ampacity(240.4(D): The maximum overcurrent protection device for a No. 14 is 15 ampere, No. 12 is 20 ampere, and No. 10 is 30 ampere. This is a general rule, but it does not apply to motors or air-conditioners according to Section 240-3.24

          

  140. (343-351) The minimum radius for a bend of 1 inch rigid conduit with three No. 10 TW conductors is ____ inches, if a one shot bender is used.5 ¾

          

  141. (300-6(D)) The provisions required for mounting conduits on indoor walls or in rooms that must be hosed down frequently is ______ between the mounting surface and the electrical equipment.the largest overcurrent device protecting conductors in the raceway

          

  142. (250-122) Where necessary to comply with Section 250-2(d), the equipment grounding conductors shall be sized larger than specified in ______.Table 250-122

          

  143. What size conductor is required for a 104 ampere continuous load that is protected with a 150 ampere breaker?4/0

          

  144. (424-40(A)) All bare FCC cable end fittings shall be sealed, insulated, and listed.(True/False)8

          

  145. (Table 310-15(b)(3a)): A raceway contains eight current-carrying conductors. What size conductor is required to feed a 21 ampere noncontinuous lighting load? The overcurrent protection device is rated 30 ampere.8

          

  146. (300-10) All metal raceways, cable armor, boxes, fittings, cabinets and other enclosures for conductors must be _____ joined together to form a continuous electrical conductor.Metallically

          

  147. (300-5(I)) All conductors of a circuit are required to be in the same raceway and in close proximity in the same trench.(True/False)True

          

  148. (324-10(B)(2)) General use branch circuits using flat conductor cable shall not exceed_____ amperes.20

          

  149. (250-172) Cases or frames of instrument transformers are not required to be grounded when accessible to qualified persons only or for current transformers where the primary is not over 150 volts to ground and which are used exclusively to supply current to meters.(True/False)True

          

  150. (250) When considering whether equipment is effectively grounded, the structural metal frame of a building shall be permitted to be used as the required equipment grounding conductor for AC equipment.(True/False)False

          

  151. (348-30(A)(Exp 3) 3/8 inch flexible metal conduit used for the supply to recessed lighting fixtures must have the raceway secured every _____ feet.For a maximum of 1000 volts

          

  152. (250-102(c)(1)) The bonding jumper for service raceways must be sized according to the _____.Service entrance conductor size

          

  153. (240) (210-20(A))The maximum continuous load permitted on an overcurrent protection device is limited to _____ of the device rating.Corrosion protection

          

  154. (Table 300-5) UF cable is used to supply power to a 120 volt 15 ampere GFCI protected circuit. If the cable is installed outdoors under the driveway of a one-family dwelling, the minimum cover requirement is _____ inches.0-600

          

  155. (398-30(D)) Where screws are used to mount knobs for the support of open wiring on insulators, they shall be of a length sufficient to penetrate the wood to a depth equal to at least _____ the height of the knob and the full thickness of the cleat.1/2

          

  156. What is the neutral current for a balanced 16 ampere 3 wire 208Y/120-volt branch circuit of a 4 wire 3 phase wye system that supplies fluorescent lighting?No. 8

          

  157. Conductor Insulation Property(310.104): THHN can be described as thermoplastic insulation with a nylon cover; having a maximum operating temperature of 90 degrees C(True/False)True

          

  158. (Table 310-106(A)) The minimum size conductor permitted in a commercial building for branch circuits under 600 volts is No. _____.No. 6

          

  159. Conductors in Parallel(310-10(H)(5): All parallel equipment grounding conductors are required to be a minimum No. 1/0.(True/False)False

          

  160. (396-30) The messenger shall be supported at dead ends and at intermediate locations so as to eliminate _____ on the conductors.10

          

  161. The ampacity of 15 current carrying No. 10 RHW aluminum conductors in an ambient temperature of 75F would be _____.True

          

  162. Conductors in Parallel: (310-10(H)(1) When an electric relay (coil) is energized, the initial current can be very high, causing significant voltage drop. The reduced voltage at the coil (because of voltage drop) can cause the coils contacts to chatter (open and close like a buzzer) or not close at all. Paralleling of control wiring conductors is often necessary and permitted by the NEC to reduce the effects of voltage drop for long control runs.(True/False)True

          

  163. Air Conditioning: An air conditioner nameplate indicates the minimum circuit ampacity of 43 ampere and maximum fuse size of 60 ampere. What is the minimum size branch circuit conductor and the maximum size overcurrent protection device?(422.13)True

          

  164. What is the ampacity of four current-carrying No. 8 THHN conductors installed in ambient temperature of 100 degrees F?40 ampere

          

  165. (314-3) Nonmetallic boxes are permitted for use with _____.Permitted

          

  166. (392-18(B)) Each run of cable tray shall be _____ before the installation of cables.Completed

          

  167. (330-116) The metallic sheath of metal-clad cable shall be continuous and _____.Close-fitting

          

  168. (332-112) The conductor insulation in Type MI cable shall be a highly compressed refractory mineral that will provide proper _____ for the conductors.Spacing

          

  169. (324-42(A)) Receptacles, receptacle housings, and self-contained devices used with flat conductor cable systems shall be _____.Locking type

          

  170. (310-15(A)(16) If the ambient temperature is 71 C, the minimum insulation that a conductor must have and still have the capacity to carry current is _____.320

          

  171. (250-96(a)) Metal parts that serve as the grounding conductor must be ______ together to ensure electrical continuity and have the capacity to conduct safely any fault current likely to be imposed.bonded.

          

  172. (240-4(b)) IF the ampacity of a conductor does not correspond with the standard ampere rating of a fuse or circuit breaker, the next size up protection device is permitted. This applies only if the conductors supply multioutlet receptacles for portable cord and plug-connected loads.(True/False)True

          

  173. (354-10) The use of nonmetallic conduit with conductors shall be permitted for direct burial underground installation; in cinder fill; or encased or embedded in concrete.(True/False)True

          

  174. Terminal Rating(110-14(c)(1): Equipment terminals rated 100 amperes or less (circuit breakers, fuses, etc.) and pressure connector terminals for No. 14 through No. 1 conductors shall have the conductor sized according to _____ degree temperature rating as listed in Table 310.15(a)(16)60

          

  175. (350-60) Where liquidtight flexible conduit is used to connect to equipment and flexibility where required, a separate _____ conductor must be installed.True

          

  176. (310-120(C)) Suffixes to designate the number of conductors within a cable are D "Two insulated conductors laid in parallel" or M "Two or more insulated conductors twisted spirally".(True/False)300

          

  177. (368-30) Busways shall be securely supported, unless otherwise designed, and marked at intervals not to exceed _____ feet.12

          

  178. What size equipment grounding conductor is required in each of two raceways for a 600 ampere feeder?(Table 250.122)4/0

          

  179. (310-10 and 310-15) The temperature rating of a conductor is the maximum operating temperature the conductor insulation can withstand (without serious damage) over a prolonged period of time. The conductor allowable ampacities, ambient temperature correction factors, and correction factors all provide guidance for adjusting the conductor's ampacities for the different conditions.(True/False)57 amperes

          

  180. Overcurrent protection devices have two ratings, overcurrent and _________.Ampere interrupting current(AIC)

          

  181. (368-17(C)) Where devices or plug-in connections for tapping off feeder or branch circuits fro busways consist of an externally operable fusible switch, ropes, chains, or sticks shall be provided for operation of the disconnecting means from the floor.(True/False)True

          

  182. (240) A 65 ampere continuous load requires a _____ ampere overcurrent protections device.12

          

  183. (342-42(A)) Threadless couplings approved for use with intermediate etal conduit in wet locations shall be of the _____ type.Raintight

          

  184. A raceway contains four current-carrying conductors. What size conductor is required to supply a 40 ampere non-continuous load?40 ampere

          

  185. The ampacity of the nine current-carrying No. 10 THW conductors installed in a 20 inch long raceway is_____.35 amperes

          

  186. (110-14(C) Most terminals are rated 60C for equipment 100 ampere and less and 75C for equipment terminals rated over 100 ampere. Regardless of the conductor ampacity, conductors must be sized no smaller than the terminal temperature rating.(True/False)True

          

  187. (398-15(C)) Where open conductors cross ceiling joists and wall studs and are exposed to physical damage, they shall be protected by a substantial running board. Running boards shall extend at least _____ inch outside the conductors, but not more than ______ inches, and the protecting sides shall be at least 2 inches high and at least 1 inch nominal in thickness..82

          

  188. Conductors in Paralle(310-10(H)(2) l:To ensure that the currents are evenly distributed between the parallel conductors, each conductor within a parallel set must be installed in the same type of raceway(metallic or nonmetallic) and must be the same length, material, circular mils, insulation type, and must terminate in the same method.(True/False)False

          

  189. (210-196) There is no mandatory rule in the NEC limiting the voltage drop on conductors, but the Code recommends that we consider its effect.(True/False)86

          

  190. The ampacity of a conductor is listed in table _____ under the condition of no more than three current carrying conductors bundled together in raceway, cable or earth an ambient temperature of 86 degrees F.310.15(b)(16)

          

  191. (310-60(C)(71)) Table 310-71 provides ampacities of an insulated three-conductor copper cable isolated in air, based on conductor temperature of 90 C (194 F) and ambient air temperature of 40 C (104 F) . If the conductor size is No. 4/0 AWG, MV-105, and the voltage range is 2001 to 5000, the ampacity is _____ amperes90C

          

  192. (332-10(1)) Flat cable assemblies shall be permitted only as branch circuits to supply suitable tap devices for lighting, small power, or small appliance loads.(True/False)True

          

  193. Current Carrying Conductors(310-15(B)(5): The neutral conductor of a balanced 4 wire wye circuit that is at least 50 percent loaded with nonlinear loads (electric discharge lighting, electronic ballast, dimmers, controls, computers, laboratory test equipment, medical test equipment, recording studio equipment, etc.) is not considered a current-carrying conductor for the purpose of applying bundle adjustment factors.(True/False)True

          

  194. (370-7) A cablebus system shall include approved fittings for _____.True

          

  195. (590-4(C)) Type NM and NMC cables can be used for temporary wiring in structures of a height of 6 feet, 12 feet, or 18 feet.(True/False)True

          

  196. (324-2) Type FCC cable consists of ______ conductors.Three or more flat

          

  197. (300-19, Table 300-19(A)) A 100 foot vertical run of No. 4/0 copper requires the conductors to be supported at _____ locations.2

          

  198. (352-60) An equipment grounding conductor is not required in the conduit if the grounded (neutral) conductor is used to ground equipment as permitted in Section 250-142.(True/False)No. 1

          

  199. A No. _____ THHN conductor is required for a 19.7 ampere load if the ambient temperature is 75F and there are nine current-carrying conductors in the raceway.No. 8

          

  200. (324-10(E)) Use of FCC systems in damp locations shall be _____.Permitted

          

  201. Terminal Rating(110-14(C)(1):What size conductor is required to supply a 190 ampere load in a dry location? Terminals are rated 75 degrees C.No. 3/0

          

  202. Conductors in Parallel(310-10(H)(1)(Table 250-122): What are the conductors required for a 250 ampere feeder paralleled in two raceways?True

          

  203. (3392-56) Cable ______ made and insulated by approved methods shall be permitted to be located within a cable tray provided they are accessible They may project above the side rails where not subject to physical damage.True

          

  204. (310-15(B)(3)(a)(2)The ampacity of a conductor can be different along the length of the conductor. The higher calculated ampacity can be used if the length of the lower ampacity is no more than 10 feet or no more than 10 percent of the length of the circuit conductors.(True/False)144 ampere

          

  205. Both grounded and ungrounded conductors of a two wire circuit (are) (are not) considered current carrying.Is

          

  206. (250-110) Exposed noncurrent-carrying metal parts likely to become energized must be grounded where within 8 feet vertically or 5 feet horizontally of ground or grounded objects, located in wet or damp locations, or in electrical contact with metal(True/False).True

          

  207. (240) A department store ( continuous load) feeder supplies a lighting load of 103 ampere. The minimum size overcurrent protection device permitted for this feeder is _____ ampere.150

          

  208. (342-30(B)) When IMC is installed through bored or punched holes in framing members, additional support requirements are not necessary. This applies to both wood and metal framing members.(True/False)True

          

  209. (394-17) Where knob and tube conductors pass through wood cross members in plastered partitions, conductors shall be protected by noncombustible, nonabsorbent, insulating tubes extending not less then _____ inches beyong the wood member.3

          

  210. (340-12) Type UF cable shall not be used where subject to physical damage. When this cable is subject to physical damage, it shall be protected by a suitable method such as a raceway.(True/False)True

          

  211. (374-9)A junction box used with a cellular metal floor raceway shall be level with the floor grade, sealed against the entrance of water or concrete, and metal and electrically continuous.(True/False)Nonmetallic cables and raceways

          

  212. What size protection device is required for a 100 ampere continuous load?No. 8 THHN

          

  213. (Table 344-30(B)(2) ) Straight runs of 1 inch rigid metal conduit using threaded couplings may be secured at intervals not exceeding _____ feet.12

          

  214. (320-30(B)) AC cable shall be supported at intervals not exceeding 4 ½ feet and the cable shall be secured within _____ inches of cable termination.Tension

          

  215. (240)(240-60(c), 240-83(c) Overcurrent devices must be designed and rated to clear fault current and must have a short-circuit interrupting rating sufficient for the available fault levels. The minimum interruption rating for circuit breakers is _____ ampere and ____ ampere for fuses.5000, 10000

          

  216. Equipment rated 100 ampere or less must have the conductor sized no smaller than the 60 degree column of Table 310-15(B)(16). Equipment rated at more than 100 ampere must have the conductors sized no smaller than for the 75 degree column of Table 310-15(B)(16)(True/False)68 amperes

          

  217. The next higher overcurrent protection device is permitted if Conductors do not supply multioutlet branch circuits for cord and plug connected loads; the ampacity of a conductor does not correspond with the standard ampere rating of a standard fuse or circuit breaker; The next size up breaker or fuse does not exceed 800 ampere.(True/False)True

          

  218. (334-15(C)) Where NMC cable is run at angles with joists in unfinished basements it shall be permissible to secure cables not smaller than ____ conductors directory to the lower edge of the joist.Concrete-tight

          

  219. (250-114(3)) Which of the following appliances installed in residential occupancies need not be grounded?.82

          

  220. TW can be described as thermoplastic insulation, suitable for dry or wet locations with a maximum operating temperature of 60 degrees C(True/False)True

          

  221. (368-100)Surface metal raceways and their fittings shall be so designed that the sections can be electrically or mechanically coupled together and installed without subjecting wires to abrasion.(True/False)True

          

  222. (300-13(A)) Conductors in raceways must be _____ between outlet devices and there shall be no splice or tap within a raceway itself.True

          

  223. (300-23) Wiring methods and equipment installed behind panels designed to permit access (such as drop ceilings) shall be so arranged and secured to permit the removal of panels to give access to electrical equipment.(True/False)True

          

  224. (300-5(F)) Backfill used for underground wiring must not damage the wiring method, contribute to the corrosion of the raceway or prevent compaction of the fill.(True/False)True

          

  225. (300-2) Unless specified elsewhere in the Code, Chapter 3 shall be used for voltages of _____.Substantially increased

          

  226. (326-2) Type IGS cable is a factory assembly of one or more conductors, each individually insulated and enclosed in a loose fit nonmetallic flexible conduit as an integrated gas spacer cable rated _____ volts.0-600

          

  227. (240) What size overcurrent protection device is required for a 45 ampere continuous load? The circuit is in a raceway with 14 current carrying conductors.60

          

  228. (338-2) _____ is a type of multiconductor cable permitted for use as an underground service entrance cable.True

          

  229. (392-20(C)) Where single conductor cables comprising each phase or neutral of a circuit are connected in parallel in a cable tray, the conductors shall be installed _____ to prevent current unbalance in the paralleled conductors due to inductive reactance.In groups consisting of not more than one conductor per phase or neutral

          

  230. What is the ampacity of four current-carrying No. 10 THHN conductors installed in a raceway or cable?57 amperes

          

  231. What size 75 degree C conductors are required for a 600 ampere service that has a calculated demand load of 550 amperre?125 ampere

          

  232. (342-30(A)) Intermediate metal conduit shall be firmly fastened within _____ of each outlet box, junction box, device box, fitting, cabinet, or other conduit termination.3 feet

          

  233. Water Heater: What size conductor and protection device is required for a 4500 VA, 240 Volt water heater(422.11(e)?4/0

          

  234. Conductors in Parallel(310-10(H)(1) : Phase and grounded (Neutral) conductors sized No. 1 AWG and larger are permitted to be connected in parallel.False

          

  235. (376-30) Wireways where run horizontally shall be supported at each end and the distance between supports shall not exceed _____ feet.10

          

  236. Terminal Rating(110-14(C)(1): What is the minimum size THHN conductor required for a 150 ampere circuit breaker or fuse? Be sure to comply with the requirements of Section 110-14(C)(2).No. 1/0

          

  237. (332-24(2)) The radius of the inner edge of any bend shall not be less than ____ times the MI cable diameter for a cable that has a diameter of over ¾ inch.A ¼ inch air space

          

  238. (300-3(c)(1)) Circuit conductors that operate at 277 volts (with 600 volt insulation) may occupy the same enclosure or raceway with 48-volt dc conductors that have an insulation rating of 300 volts.(True/False)True

          

  239. Grounding and bonding conductors (are) (are not) considered current carrying.Are not

          

  240. (394-12) Concealed knob and tube wiring shall be permitted to be used in commercial garages, theaters and similar locations, motion picture studios, hazardous (classified) locations, or in the hollow spaces of walls, ceilings, and attics where such spaces are insulated by loose, rolled or foamed in place insulating material that envelops the conductors(True/False).True

          

  241. (378-21) Conductors larger than that for which the wireway is designed shall be permitted to be installed in any wireway.(True/False)Ground