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146 Matching questions

  1. (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 _____.
  2. (360-10) Flexible metallic tubing shall be permitted to be used _____.
  3. Voltage drop considerations are for ________ and not for safety; therefore, sizing conductors for voltage drop is not a Code requirement.
  4. (362-2) Electrical nonmetallic tubing is composed of a material that is resistant to moisture, chemical atmospheres, and is ______.
  5. (390-8) When an outlet from an underfloor raceway is discontinued, the circuit conductors supplying the outlet _____.
  6. (342-42(A)) Threadless couplings approved for use with intermediate etal conduit in wet locations shall be of the _____ type.
  7. (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.
  8. 352-10(F)) Rigid nonmetallic conduit can be installed exposed in buildings _____.
  9. (310-60(A)) Thermal resistivety is the reciprocal of thermal conductivity; it is designated Rho and expressed in units of ______.
  10. Ampere interrupting current (AIC) is for short circuit faults. They are meant to protect a device from _______ while trying to clear a fault.
  11. Overcurrent protection devices have two ratings, overcurrent and _________.
  12. 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.
  13. (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.
  14. (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.
  15. (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.
  16. (392-12) Cable tray systems shall not be used in hoistways or _______.
  17. (590-3(D)) Temporary wiring must be _____ immediately upon the completion of the purpose for which it was installed.
  18. (392-18(B)) Each run of cable tray shall be _____ before the installation of cables.
  19. The grounded neutral of a balanced 3-wire delta circuit or balance 4 wire wye circuit (is)(is not) considered a current carrying conductor.
  20. (240) A continuous load of 27 ampere requires the circuit overcurrent protection device to be sized at _____ ampere.
  21. What size THHN conductor is required for a 50 ampere circuit, listed for use at 75 degrees C?
  22. (Table 392-60(A) (b)) Steel cable trays shall not be used as equipment grounding conductors for circuits with ground-fault protection above _____ amperes.
  23. Water Heater: What size conductor and protection device is required for a 4500 VA, 240 Volt water heater(422.11(e)?
  24. (300-22(B)) Wiring methods permitted in ducts or plenums used for environmental air include _______.
  25. 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)
  26. (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.
  27. (300-22C) The space above a dropped ceiling used for environmental air is considered as _____ and the wiring limitations of Section _____ apply.
  28. (332-40(B)) Where MI cable terminates, a _____ shall be provided immediately after stripping to prevent the entrance of moisture into the insulation.
  29. Both grounded and ungrounded conductors of a two wire circuit (are) (are not) considered current carrying.
  30. (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 _____.
  31. (362-28) All cut ends of electrical nonmetallic tubing shall be trimmed inside and ____ to remove rough edges.
  32. (324-2) Type FCC cable consists of ______ conductors.
  33. 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?
  34. 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.
  35. The ampacity of 15 current carrying No. 10 RHW aluminum conductors in an ambient temperature of 75F would be _____.
  36. (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.
  37. (350-60) Where liquidtight flexible conduit is used to connect to equipment and flexibility where required, a separate _____ conductor must be installed.
  38. (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.
  39. (240) (210-20(A))The maximum continuous load permitted on an overcurrent protection device is limited to _____ of the device rating.
  40. What size conductors(2) would be required in one raceway (nipple) for a 600 ampere service? The calculated demand load is 550 ampere.
  41. (Table 310-106(A)) The minimum size conductor permitted in a commercial building for branch circuits under 600 volts is No. _____.
  42. (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.
  43. (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.
  44. (324-10(E)) Use of FCC systems in damp locations shall be _____.
  45. (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.
  46. (Table 310-15(b)(3a)): What is the ampacity for four No. 1/0 THHN conductors?
  47. (330-116) The metallic sheath of metal-clad cable shall be continuous and _____.
  48. (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 _____.
  49. (358-2(A)(B)) The minimum and maximum size of EMT is _____ inches, except for special installations.
  50. Conductors in Parallel(310-10(H)(1)(Table 250-122): What are the conductors required for a 250 ampere feeder paralleled in two raceways?
  51. The smallest size conductor permitted by the NEC for branch circuits, feeders or services is _____ copper or _____ aluminum.
  52. 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?
  53. 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)
  54. (310-10(H)(1)) In general, the minimum size phase, neutral or grounded conductor permitted for use in parallel is No. ___.
  55. (314-3) Nonmetallic boxes are permitted for use with _____.
  56. 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?
  57. (370-3) Cablebus framework, where _____, shall be permitted as the equipment grounding conductor for branch circuits and feeders.
  58. (368-30) Busways shall be securely supported, unless otherwise designed, and marked at intervals not to exceed _____ feet.
  59. (382-56) Receptacle type tap connectors for nonmetallic extensions shall be of the _____.
  60. (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?
  61. (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.
  62. To find the correction factor for situation where four or more current carrying conductors are bundled together, consult Table _____.
  63. (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.
  64. (Table 352-30) 1 inch rigid nonmetallic conduit must be supported every _____ feet.
  65. (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 _____.
  66. (250-114(3)) Which of the following appliances installed in residential occupancies need not be grounded?
  67. (250-164(A)) DC systems to be grounded and supplied from an off premises source shall have the grounding connection made at _____.
  68. (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.
  69. (358-26) A run of electrical metallic tubing between outlet boxes shall not exceed _____ close to the box.
  70. (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 _____.
  71. (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.
  72. Continuous Load Protection: Overcurrent protections devices are sized at no less than ____ percent of the continuous load, plus _____ percent of the noncontinuous load.
  73. The ampacity of 10 current-carrying No. 6 THHW conductors installed in an 18 inch long raceway with an ambient temperature of 39C is ____.
  74. 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)
  75. (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)
  76. (250-122) Where necessary to comply with Section 250-2(d), the equipment grounding conductors shall be sized larger than specified in ______.
  77. (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.
  78. (250-146) An _____ shall be used to connect the grounding terminal of a grounding - type receptacle to a grounded box.
  79. (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.
  80. (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.
  81. (396-30) The messenger shall be supported at dead ends and at intermediate locations so as to eliminate _____ on the conductors.
  82. Conductor Sizing(310-106(a): The smallest size conductor permitted for branch circuits, feeders, and services for residential, commercial, and industrial locations is _____.
  83. (370-2) Cablebus is ordinarily assembled at the _____.
  84. 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.
  85. Conductor bundle ampacity adjustment does ot apply to conductors that are in a conduit that does not exceed _____ inches in length.
  86. (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?
  87. If the overcurrent protection device is over 800 ampere, the circuit conductor ampacity must not be ____ than the rating of the overcurrent protection device.
  88. (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.
  89. (374-2)A _____ is defined as a single enclosed tubular space in a cellular metal floor member.
  90. Grounding and bonding conductors (are) (are not) considered current carrying.
  91. (110-14(c)(1) )What size THHN conductor is required for a 50 ampere circuit, listed for use at 60 degrees C?
  92. (240) A 65 ampere continuous load requires a _____ ampere overcurrent protections device.
  93. (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.
  94. (300-19, Table 300-19(A)) A 100 foot vertical run of No. 4/0 copper requires the conductors to be supported at _____ locations.
  95. 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.
  96. The ampacity of the nine current-carrying No. 10 THW conductors installed in a 20 inch long raceway is_____.
  97. (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.
  98. 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)
  99. 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))
  100. (370-7) A cablebus system shall include approved fittings for _____.
  101. (324-10(B)(2)) General use branch circuits using flat conductor cable shall not exceed_____ amperes.
  102. What size equipment grounding conductor is required in each of two raceways for a 600 ampere feeder?(Table 250.122)
  103. (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 _____.
  104. 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?
  105. (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.
  106. (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.
  107. (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 ______.
  108. (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).
  109. (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 _____.
  110. When selecting a conductor for a circuit, always select the conductors not smaller than the _______ of the equipment.
  111. (390-4(b))Underfloor raceways spaced less than 1 inch apart shall be covered with concrete to a depth of _____ inches.
  112. (250-102(c)(1)) The bonding jumper for service raceways must be sized according to the _____.
  113. What size 75 degree C conductors are required for a 600 ampere service that has a calculated demand load of 550 amperre?
  114. (300-2) Unless specified elsewhere in the Code, Chapter 3 shall be used for voltages of _____.
  115. (310-106(C)) Where installed in raceways, conductors No. _____ and larger shall be stranded.
  116. What size protection device is required for a 100 ampere continuous load?
  117. (310) TFE-insulated conductors are manufactured in sizes from No. 14 through No. _____.
  118. (338-2) _____ is a type of multiconductor cable permitted for use as an underground service entrance cable.
  119. (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.
  120. (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.
  121. 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)
  122. (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)
  123. Conductor Insulation Properties: Table _____ of the NEC provides information on conductor properties such as permitted use, maximum operating temperature and other insulation details.
  124. (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 _____ amperes
  125. (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.
  126. (348) The maximum run length of 3/8 inch flexible metal conduit for any circuit is_____ feet.
  127. (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.
  128. (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.
  129. (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.
  130. What is the ampacity of four current-carrying No. 10 THHN conductors installed in a raceway or cable?
  131. The grounded neutral of a balanced 3 wire wye circuit (is)(is not) considered a current carrying conductor.
  132. (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.
  133. (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.
  134. What size conductor is required for a 104 ampere continuous load that is protected with a 150 ampere breaker?
  135. (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)
  136. (324-42(A)) Receptacles, receptacle housings, and self-contained devices used with flat conductor cable systems shall be _____.
  137. (332-112) The conductor insulation in Type MI cable shall be a highly compressed refractory mineral that will provide proper _____ for the conductors.
  138. (300-13(A)) Conductors in raceways must be _____ between outlet devices and there shall be no splice or tap within a raceway itself.
  139. (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.
  140. (Table 250-122) What is the minimum size equipment grounding conductor required for equipment connected to a 40 ampere rated circuit?
  141. What is the ampacity of four current-carrying No. 8 THHN conductors installed in ambient temperature of 100 degrees F?
  142. (330-30(B)) Type MC cable shall be supported and secured at intervals not exceeding _____ feet.
  143. (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.
  144. The ampacities listed in Table 310.15(b)(16) are based on temperature alone and do not take _____ into account.
  145. (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.
  146. (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 ______.
  1. a True
  2. b Outside
  3. c Termination
  4. d False
  5. e 1, 2
  6. f Ampere interrupting current(AIC)
  7. g 57 amperes
  8. h Table 250-66
  9. i 10
  10. j 80%
  11. k Tubular
  12. l 125 ampere
  13. m 35
  14. n Junction boxes
  15. o Ground
  16. p No. 1/0
  17. q Completed
  18. r One of more supply stations
  19. s bonded.
  20. t 1/2
  21. u Terminal ratings
  22. v 0-600
  23. w No. 4/0
  24. x 144 ampere
  25. y Three or more flat
  26. z are
  27. aa Continuous
  28. ab Locking type
  29. ac Shall be removed from the raceway
  30. ad Seal
  31. ae Removed
  32. af 68 amperes
  33. ag Equipment bonding jumper
  34. ah the largest overcurrent device protecting conductors in the raceway
  35. ai 310.15(b)(16)
  36. aj 300
  37. ak 12
  38. al 60
  39. am No. 14 copper or No. 12 aluminum
  40. an 3
  41. ao Corrosion resistant.
  42. ap 7
  43. aq No. 4
  44. ar No. 10
  45. as 8
  46. at No. 8
  47. au 310.104(a)
  48. av Splices
  49. aw Dead ends
  50. ax 1 ½
  51. ay 3-No.8 AWG
  52. az 40 ampere
  53. ba 5000, 10000
  54. bb 5 ¾
  55. bc 14
  56. bd No limit
  57. be 600
  58. bf Is
  59. bg USE
  60. bh No. 10 THHN
  61. bi .82
  62. bj No. 12 THHN
  63. bk 130 ampere
  64. bl Cell
  65. bm No. 8 THHN
  66. bn Does not
  67. bo 60 C
  68. bp 90
  69. bq 32 ampere
  70. br 136 amperes
  71. bs 150
  72. bt 5
  73. bu Nonmetallic cables and raceways
  74. bv 86
  75. bw 75 degree
  76. bx 6
  77. by Less
  78. bz 80
  79. ca Concrete-tight
  80. cb Suitable for direct burial
  81. cc #10AWG, 30 Amps
  82. cd 3 feet
  83. ce Close-fitting
  84. cf No. 6
  85. cg Tension
  86. ch 2
  87. ci Raintight
  88. cj 24 inches
  89. ck Degrees C-cm/watt
  90. cl No. 1
  91. cm 4
  92. cn 4/0
  93. co 1250 kcmil
  94. cp Cross-sectional area
  95. cq Point of installation
  96. cr Equipment grounding conductor
  97. cs 26 ampere
  98. ct No. 8, 60 ampere
  99. cu No. 14, No. 12
  100. cv 53.25 ampere
  101. cw Bonded
  102. cx For a maximum of 1000 volts
  103. cy 310.15(B)(2)(a)
  104. cz Voltage drop
  105. da 600 volts nominal, or less
  106. db 500 kmcil
  107. dc no. 14, 30 ampere
  108. dd Identified for this use
  109. de 300 kcmil
  110. df 16 ampere
  111. dg 12, 4 ½
  112. dh No. 3/0
  113. di 35 amperes
  114. dj A ¼ inch air space
  115. dk Corrosion protection
  116. dl In groups consisting of not more than one conductor per phase or neutral
  117. dm Spacing
  118. dn Encased and embedded
  119. do Permitted
  120. dp Other spaces, 300-22(c)
  121. dq Where subject to physical damage.
  122. dr Exploding
  123. ds Service entrance conductor size
  124. dt Electrical metallic tubing
  125. du Toaster
  126. dv 24
  127. dw Flame-retardant
  128. dx Are not
  129. dy Table 250-122
  130. dz Exposed
  131. ea Substantially increased
  132. eb 1/0
  133. ec 360 degrees total
  134. ed Ungrounded
  135. ee 125, 100
  136. ef Is not
  137. eg 20
  138. eh Of any height
  139. ei 9
  140. ej Efficiency of operation
  141. ek Metallically
  142. el 320
  143. em 90C
  144. en ½ to 4
  145. eo 34.5 ampere
  146. ep Listed