Journeyman Electrician # 1 Graded A+

Journeyman Electrician # 1 Graded A+ 1. What is the maximum allowed protection for circuits subdividing a listed instantaneous water heater? - a) 60 amperes - b) 100 amperes - c) 120 amperes - d) 150 amperes (Correct Answer: d) 150 amperes) - Reference: 422.11(F)(3) 2. How should the interior of raceways or enclosures installed underground be classified? - a) wet location (Correct Answer: a) wet location) - b) damp location - c) moist location - d) dry location - Reference: 300.5(B) 3. How often must the continuity of the grounding conductor system for portable electrical carnival equipment be verified? - a) and recorded on an annual basis - b) and recorded on a quarterly basis - c) and recorded on a monthly basis - d) each time the equipment is connected (Correct Answer: d) each time the equipment is connected) - Reference: 525.32 4. What is the minimum installation depth required for a plate-type grounding electrode below the earth's surface? - a) 24 inches - b) 30 inches (Correct Answer: b) 30 inches) - c) 36 inches - d) 48 inches - Reference: 250.53(H) 5. What is the maximum ampacity of a 1/0 AWG THW copper current-carrying conductor, installed in a raceway with three other similar conductors, at an ambient temperature of 86°F? - a) 150 amperes - b) 105 amperes - c) 112 amperes - d) 120 amperes (Correct Answer: d) 120 amperes) - Reference: Tbl. 310.16; Tbl. 310.15(B)(2)(a) - Solution: The ampacity for 1/0 AWG THW before derating is 150 amperes. After applying an 80% adjustment factor, the maximum ampacity is 120 amperes. 6. According to the NEC, how is a continuous load defined? - a) 3 hours (Correct Answer: a) 3) - b) 4 hours - c) 6 hours - d) 8 hours - Reference: Article 100 7. What is the minimum size of THW copper branch circuit conductors needed to supply a three-phase, continuous duty AC motor with a full-load current of 70 amperes, assuming all terminations are rated at 75°C? - a) 1 AWG - b) 2 AWG - c) 3 AWG (Correct Answer: c) 3 AWG) - d) 4 AWG - Reference: 430.22(A); Tbl. 310.16 - Solution: For a motor with a full-load current of 70 amperes, calculate 70 amperes x 125% = 87.5 amperes. Therefore, 3 AWG THW conductors with an ampacity of 100 amperes should be chosen. Given: you have determined a conductor has a computed allowable ampacity of 75 amperes. What is the MAXIMUM standard ampere rating of the overcurrent protection device the NEC permits to protect this circuit? This is not a motor circuit or part of a multi-outlet branch-circuit supplying receptacles. a) 70 amperes b) 75 amperes c) 80 amperes d) 85 amperes C: 80 amperes Ref: 240.4(B)(2) and (3); 240.6(A) A 208-volt, three-phase, 50 HP, squirrel-cage, continuous duty, Design C, AC motor has a full-load running current of _____. a) 130 amperes b) 143 amperes c) 162 amperes d) 195 amperes B: 143 amperes Ref: Tbl. 430.250 Which of the following metal piping systems contained in a building is/are required to be bonded? a) A gas pipe for a gas heater. b) A bathroom copper water pipe, connected to an electric water heater. c) An air line for compressed air. d) All of these need to be bonded. D: All of these need to be bonded. Ref: 250.104(B) Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight size 6 AWG copper conductors with THHW insulation, installed in a 60 foot conduit run. a) 1 inch b) 11⁄4 inch c) 11⁄2 inch d) 2 inch B: 11⁄4 inch Ref: Annex C, Tbl. C.1 When a feeder supplies a continuous-load of 240 amperes, in general, the overcurrent protection device protecting this circuit shall have a MINIMUM rating of _____. a) 240 amperes b) 300 amperes c) 250 amperes d) 275 amperes B: 300 amperes Sol: 240 amperes x 125% = 300 amperes In general, liquidtight flexible metal conduit (LFMC) shall be securely fastened within _____ of each box or other conduit termination. a) 41⁄2 feet b) 3 feet c) 12 inches d) 18 inches C: 12 inches Ref: 350.30(A) When a pull box contains conductors of size 4 AWG and larger and a straight pull of the conductors is to be made, the length of the box shall NOT be less than _____ times the trade diameter of the largest