Journeyman Final Exam Questions and Answers

Journeyman Final Exam Questions and Answers Which of the following conductor insulation types, if any, is/are acceptable for wiring in a fluorescent luminaire when the branch-circuit conductor passes within three (3) inches of the ballast? I. THW II. THWN 1.) neither I nor II 2.) both I and II 3.) I only 4.) II only -Answer-Answer: both I and II Table 310.4(A) on page 70-153 of the NEC® 2020 Fire pump supply conductors on the load side of the final disconnecting means and overcurrent device(s) are permitted to be routed through the inside of a building if _____. 1.) concealed within walls, floors, or ceilings that provide a thermal barrier of material that has at least a 15-minute fire rating 2.) encased in at least two (2) inches of brick or concrete 3.) installed in raceways with power conductors 4.) installed in a listed electrical circuit protective system with a 1-hour fire rating - Answer-Answer: encased in at least two (2) inches of brick or concrete 695.6(A)(2)(4) on page 70-602 of the NEC® 2020 In general, with respect to the service disconnecting means, the grounding electrode conductor shall be connected to the grounded service conductor on _____. I. the supply side II. the load side 1.) both I and II 2.) I only 3.) II only 4.) either I or II -Answer-I only 250.24(A)(5) on page 70-114 of the NEC® 2020 When made up with threaded couplings, straight runs of trade size 2-inch rigid metal conduit (RMC) shall be supported at intervals of at LEAST every _____. 1.) 20 feet 2.) 14 feet 3.) 16 feet 4.) 10 feet -Answer-answer: 16 ft 344.30(B)(2) on page 70-207 of the NEC® 2020,Table 344.30(B)(2) on page 70-207 of the NEC® 2020 Where a 36 in. long conduit contains one (1) ungrounded conductor, one (1) grounded conductor, and one (1) equipment grounding conductor, the conduit may be filled to a MAXIMUM of _____ of its cross-sectional area. 1.) 53 percent 2.) 31 percent 3.) 60 percent 4.) 40 percent -Answer-40 percent Chapter 9, Table 1 on page 70-695 of the NEC® 2020 Where a fuse or inverse time circuit breaker is used for overload protection for a hermetic motor-compressor, this device shall be rated at NOT more than _____ of the motor-compressor rated load-current. 1.) 115 percent 2.) 175 percent 3.) 150 percent 4.) 125 percent -Answer-125 percent 440.52(A)(3) on page 70-339 of the NEC® 2020 Nonconductive optical fiber cable may occupy the same raceway with conductors supplying lights and power, provided the operating voltage does NOT exceed _____. 120 volts 250 volts 600 volts 1000 volts -Answer-1000 Volts 770.133 on page 70-660 of the NEC® 2020 A metal electrical junction box with a flat blank plate to be installed will contain the following conductors: • six (6) size 10 AWG with THWN insulation • ten (10) size 12 AWG with THWN insulation • three (3) size 14 AWG equipment grounding conductors Which of the following listed junction boxes would have the MINIMUM volume, in cubic inches, as required by the NEC®? 40 cubic inches 43 cubic inches 36 cubic inches 49 cubic inches -Answer-40 cubic inches 314.16(B)(1) & (5) on page 70-183 of the NEC® 2020,Table 314.16(B) on page 70-184 of the NEC® 2020 - Size 10 AWG = 2.50 cu. in. x 6 wires= 15.0 cu. in. - Size 12 AWG = 2.25 cu. in. x 10 wires = 22.5 cu. in. - Size 14 AWG = 2.00 cu. in. x 1 wire = 2.0 cu. in. TOTAL = 39.5 cu. in. The classification of hazardous areas and zones, plus the wiring methods to be used, is to be determined by _____. licensed electricians qualified persons the local authority having jurisdiction engineers -Answer-qualified persons 505.7(A) on page 70-390 of the NEC® 2020 The MINIMUM size wire-type equipment grounding conductor for a 100-ampere, 120/240-volt, single-phase underground dwelling feeder whose ungrounded conductors have been increased in size from 4 AWG copper to 1 AWG copper is _____. 2 AWG copper 1 AWG copper 8 AWG copper 6 AWG copper -Answer-2 AWG copper