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Questions And Answers
Where a water pipe passes over an indoor motor control center, leak protection apparatus shall have a MINIMUM clearance of _____. a) 6 feet to the protection apparatus b) 6 feet to the water pipe c) 6 1⁄2 feet to the protection apparatus d) 6 1⁄2 feet to the water pipe - - - correct answer ✅A: 6 feet to the protection apparatus Ref: 110.26(F)(1)(a) Branch circuit grounded conductors that are not connected to an overcurrent device shall be permitted to be sized at LEAST _____ of the continuous and noncontinuous load to be served. a) 100 percent b) 80 percent c) 75 percent d) 125 percent - - - correct answer ✅A: 100 percent
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Ref: 210.19(A)(1), Ex. 2 The MAXIMUM standard rating of the initial non-time-delay fuse for the branch-circuit, short-circuit, and ground-fault protection of a 1 HP, three-phase, 208-volt, squirrel-cage AC motor shall be _____. a) 6 amperes b) 10 amperes c) 15 amperes d) 20 amperes - - - correct answer ✅C: 15 amperes Ref: 430.250; Tbl. 430.52; 430.52(C)(1), Ex. Sol: FLC of motor - 4.6 amperes x 300% = 13.8 amperes For Class III equipment that is not subject to overloading the MAXIMUM surface temperature under operating conditions shall NOT exceed _____. a) 120°C b) 165°C
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a) four 90° bends b) six 90° bends c) four 120° bends d) two 90° bends - - - correct answer ✅A: four 90° bends Ref: 352. Grounding electrodes made of pipe or conduit shall not be smaller than _____ electrical trade size. a) 1⁄2 inch b) 3⁄4 inch c) 1 inch d) 11⁄2 inch - - - correct answer ✅B: 3/4 inch Ref: 250.52(A)(5)(a) Liquid-tight flexible metallic conduit (LFMC) shall NOT be used _____.
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a) in lengths in excess of 6 feet b) in concealed work c) in hazardous locations d) where subject to physical damage - - - correct answer ✅D: where subject to physical damage Ref: 350.12(1) Determine the allowable ampacity of a size 3 AWG THHN copper conductor given the following: (1) Two current-carrying conductors are in the conduit. (2) The ambient temperature is 34°C. (3) The terminations are rated 60°C. a) 105.6 amperes b) 85.0 amperes c) 81.6 amperes d) 110 amperes - - - correct answer ✅B: 85.0 amperes Ref: 110.14(C); 310.15(A)(2); Tbl. 310.
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When sizing time-delay Class CC fuses for motor branch-circuit, short-circuit, and ground-fault protection, they are to be sized at the same value as _____. a) inverse-time circuit breakers b) non-time-delay fuses c) instantaneous trip circuit breakers d) adjustable trip circuit breakers - - - correct answer ✅B: non-time-delay fuses Ref: Tbl. 430.52, Note 1 Where sizes 1/0 AWG through 4/0 AWG single conductor cables are installed in ladder type cable tray, the MAXIMUM allowable rung spacing for the ladder cable tray shall be _____. a) 6 inches b) 9 inches c) 12 inches d) 15 inches - - - correct answer ✅B: 9 inches
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Ref: 392.3(B)(1)(a) The NEC requires the MAXIMUM length permitted for a flexible cord supplying a 208-volt, single-phase, room air-conditioner to be _____. a) 4 feet b) 6 feet c) 8 feet d) 10 feet - - - correct answer ✅B: 6 feet Ref: 440. In general, which of the following receptacle outlets in a commercial kitchen are required by the NEC to be GFCI protected? a) All 125-volt, single-phase, 15- and 20-ampere rated receptacles. b) All 125-volt, 15- or 20-ampere rated receptacles in wet locations only. c) All receptacle outlets.
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b) 80 c) 100 d) 125 - - - correct answer ✅D: 125 Ref: 430. What is the MINIMUM size equipment grounding conductor required for a 5 HP, three-phase, 208-volt motor having 20- ampere rated overload protection and short-circuit overcurrent protection rated at 30 amperes? a) 10 AWG b) 14 AWG c) 12 AWG d) 8 AWG - - - correct answer ✅A: 10 AWG Ref: Tbl. 250. If a circuit breaker serves as the controller for a motor, and the motor is not in sight of the breaker, the NEC requires which of the following?
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a) The motor to be less than 2 HP b) The breaker be able to be locked in the open position. c) The motor to be Code letter E d) The breaker to be rated 25,000 AIC. - - - correct answer ✅B: The breaker be able to be locked in the open position. Ref: 430.102(B)(2), Ex. In Class II, Division 1, hazardous locations, an approved method of connection of conduit to boxes is _____. a) compression fittings b) threaded bosses c) welding d) all of these - - - correct answer ✅B: threaded bosses Ref: 502.10(A)(4)
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d) 4 AWG - - - correct answer ✅B: 8 AWG Ref: 630.11(A); Tbl. 310. Sol: .78 (duty cycle) x 50 amperes (primary current) = 39 amperes Tbl. 310.16 requires a size 8 AWG conductor. When installing wiring for sensitive electronic equipment, the MAXIMUM voltage to ground is required to be _____ volts. a) 30 b) 60 c) 120 d) 300 - - - correct answer ✅B: 60 Ref: 647. In a health care facility, a patient bed location in a critical care area is required to have which of the following? a) four single receptacles or two duplex receptacles
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b) six single receptacles or three duplex receptacles c) two duplex receptacles or four single receptacles d) two single receptacles or one duplex receptacle - - - correct answer ✅B: six single receptacles or three duplex receptacles Ref: 517.19(B)(1) and (2) Which of the following circuits is prohibited for the grounded conductor to be dependent on receptacle devices for continuity? a) all circuits b) multi-outlet circuits c) GFCI protected circuits d) multi-wire circuits - - - correct answer ✅D: multi-wire circuits Ref: 300.13(B)
