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Journeyman Electrician Exam 3
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 answersA: 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 answersA: 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 correct answersC: 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 correct answersB: 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 correct answersD: 75 percent Ref: 376.56(A) In an underground installed Schedule 40 PVC conduit system that consists of 50 feet in length between pulling points, what is the MAXIMUM number of bends this conduit run may have? a) four 90° bends b) six 90° bends c) four 120° bends d) two 90° bends correct answersA: four 90° bends Ref: 352. Grounding electrodes made of pipe or conduit shall not be smaller than _____ electrical trade size.
d) shall be prohibited correct answersA: is not to be counted as a service disconnect Ref: 230.71(A) 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 correct answersB: 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 correct answersB: 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 answersB: 9 inches 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 answersB: 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. d) All 125-volt countertop receptacle outlets only. correct answersA: 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 correct answersA: 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) compression fittings b) threaded bosses c) welding d) all of these correct answersB: threaded bosses Ref: 502.10(A)(4) Given: an AC service is supplied with four parallel sets of size 500 kcmil aluminum conductors. What is the MINIMUM size copper grounding electrode required, when connected to the concrete-encased building steel used as the grounding electrode system? a) 3/0 AWG b) 4/0 AWG c) 250 kcmil d) 2/0 AWG correct answersA: 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 correct answersB: 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 answersB: 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 correct answersB: 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 answersD: multi-wire circuits Ref: 300.13(B)
