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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 - ANSWERA: 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 - ANSWERA: 100 percent 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 - ANSWERC: 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 c) 248°F d) 210°C - ANSWERB: 165°C Ref: 503. When a metal wireway contains splices and taps, the conductors, splices and taps shall not fill the wireway to more than _____ of its area at that point. a) 20 percent b) 30 percent c) 40 percent d) 75 percent - ANSWERD: 75 percent Ref: 376.56(A) Liquid-tight flexible metallic conduit (LFMC) shall NOT be used _____. a) in lengths in excess of 6 feet b) in concealed work c) in hazardous locations d) where subject to physical damage - ANSWERD: 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
Standard trade size 2-inch rigid polyvinyl chloride conduit (PVC), shall be supported at least every _____. a) 3 feet b) 5 feet c) 6 feet d) 8 feet - ANSWERB: 5 feet Ref: Tbl. 352. 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 - ANSWERB: non-time-delay fuses Ref: Tbl. 430.52, Note 1 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. d) All 125-volt countertop receptacle outlets only. - ANSWERA: All 125-volt, single-phase, 15- and 20- ampere rated receptacles. Ref: 210.8(B)(2) All wiring installed in or under an aircraft hanger floor shall comply with the requirements for _____ locations. a) Class I, Division 1
b) Class I, Division 2 c) Class II, Division 1 d) Class II, Division 2 - ANSWERA: Class I, Division 1 Ref: 513.8(A) In general, branch-circuit conductors supplying more than one motor shall have an ampacity of at least _____ percent of the FLC of the largest motor, and 100 percent of the FLC of the other motor(s) in the group. a) 25 b) 80 c) 100 d) 125 - ANSWERD: 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 - ANSWERA: 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? 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. - ANSWERB: The breaker be able to be locked in the open position.
a) 3/0 AWG b) 4/0 AWG c) 250 kcmil d) 2/0 AWG - ANSWERA: 3/0 AWG Ref: Tbl. 250. Given: an AC transformer arc welder has a 50-ampere rated primary current and a 60 percent duty- cycle. Determine the MINIMUM size copper 60°C rated conductors the NEC requires to supply this welder. a) 6 AWG b) 8 AWG c) 10 AWG d) 4 AWG - ANSWERB: 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 - ANSWERB: 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 b) six single receptacles or three duplex receptacles c) two duplex receptacles or four single receptacles
d) two single receptacles or one duplex receptacle - ANSWERB: 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 - ANSWERD: multi-wire circuits Ref: 300.13(B)
