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Journeyman Electrician
Where conduits enter a floor-standing switchboard or panelboard at the bottom, the conduits including their end fittings, shall not rise more than _____ above the bottom of the enclosure. a) 6 inches b) 4 inches c) 2 inches d) 3 inches correct answersD: 3 inches Ref: 408. When installed on the service of a building or structure, a type 2 SPD (TVSS) shall be connected _____. a)on the line side of the service disconnect overcurrent device b) on the load side of the service disconnect overcurrent device c) on the meter housing d) at the final overcurrent device correct answersB: on the load side of the service disconnect overcurrent device Ref: 285.24(A) A detached garage supplied from a dwelling with a three-wire feeder of size 4/0 AWG aluminum USE cable with a 200-ampere rated circuit breaker for overcurrent protection requires a MINIMUM size copper grounding electrode to a concrete encased electrode of _____ AWG. a) 8 b) 6 c) 4 d) 2 correct answersC: 4 Ref: 250.52(A)(3)
When a raceway is run from the interior to the exterior of a building, the raceway shall _____. a) be rigid metal conduit (RMC) b) be rigid polyvinyl chloride conduit (PVC) c) be sealed with an approved material d) have an explosion-proof seal correct answersC: be sealed with an approved material Ref: 300.7(A) A disconnecting means shall be provided on the supply side of all fuses in circuits having a voltage of at LEAST _____ volts to ground. a) 120 b) 250 c) 150 d) 277 correct answersC: 150 Ref: 240. Given: an 80-ampere, 240-volt, single-phase, load is located 200 feet from the supply panelboard and is supplied with size 3 AWG copper conductors with THHN/THWN insulation. What is the approximate voltage-drop on this circuit? (K = 12.9) a) 6.0 volts b) 4.0 volts c) 9.2 volts d) 7.84 volts correct answersD: 7.84 volts Ref: Chpt. 9, Tbl. 8 Sol: VD = 2KID / CM VD = (2 x 12.9 x 80 amps x 200') / 52,620 CM = 7.84 volts
a) The emergency branch and the standby branch. b) The life safety branch and the critical branch. c) The normal branch and the alternate branch. d) The essential branch and the non-essential branch. correct answersB: The life safety branch and the critical branch Ref: 517. Class 3 single-conductors shall NOT be smaller than _____. a) 18 AWG b) 16 AWG c) 14 AWG d) 20 AWG correct answersA: 18 AWG Ref: 725.179(H) Given: an office building has a 208Y/120 volt, three-phase service with a balanced net computed load of 90 kVA. What is the current each ungrounded conductor carries at full load? a) 188 amperes b) 250 amperes c) 433 amperes d) 750 amperes correct answersB: 250 amperes Ref: Trade and General Knowledge; 3-Phase Current Formula Sol: I = Power / (E x 1.732) I = (90 kVA x 1,000) / (208 x 1.732) I = 90,000 / 360.25 = 250 amperes When grounding the structural reinforcing steel of a swimming pool, what is the smallest size grounding conductor permitted for this installation?
a) 12 AWG b) 10 AWG c) 8 AWG d) 6 AWG correct answersC: 8 AWG Ref: 680.26(B)(1)(a) and (b) A surge-protective device (SPD) is a protective device for _____. a) limiting transient voltage by diverting or limiting surge current b) limiting transient voltage by absorbing and storing excessive surge current c) switching transient voltage back to the line side of the service transformer d) none of these correct answersA: limiting transient voltage by diverting or limiting surge current Ref: Art. 100 Storage batteries used as a source of power for emergency systems shall be of a suitable rating and capacity to supply and maintain the total load for at LEAST _____. a) 1โ 2 hour b) 1 hour c) 1 1โ 2 hours d) 2 hours correct answersC: 1 1โ 2 hours Ref: 700.12(A) Given: a size 14 AWG branch-circuit conductor protected by a 15-ampere rated circuit breaker is to serve three 20-ampere rated duplex receptacles. This branch-circuit: a) would be in compliance with the NEC if the wire was size 12 AWG. b) would be in compliance with the NEC if the circuit breaker was rated at 20 amperes.
d) 2 inch correct answersB: 1 1โ4 inch Ref: 550.10(G) Which of the following wiring methods is/are approved for use for fixed wiring in an area above Class I locations in a commercial garage? a) type MI cable b) type TC cable c) type MC cable d) all of the above correct answersD: all of the above Ref: 511.7(A)(1) Class II locations are those that are hazardous (classified) because of the presence of _____. a) flammable gas b) ignitible fibers c) ignitible vapors d) combustible dust correct answersD: combustible dust Ref: 500.5(C) Branch circuits supplying a fixed, storage-type, electric water heater with a capacity of 120 gallons or less, shall NOT be less than _____ of the full-load current of the water heater. a) 80 percent b) 100 percent c) 125 percent d) 150 percent correct answersC: 125 percent Ref: 422.10(A); 422.
Household-type appliances with surface heating elements having a MAXIMUM demand of more than _____ amperes, shall have its power supply subdivided into two or more circuits. a) 60 b) 50 c) 40 d) 30 correct answersA: 60 Ref: 422.11(B) When driving a ground rod and solid rock is encountered, the ground rod is permitted to be buried in a trench that is at LEAST _____ deep a) 3 feet b) 4 feet c) 24 inches d) 30 inches correct answersD: 30 inches Ref: 250.53(G) Ten copper THW conductors are to be installed in a 20-foot length of intermediate metal conduit (IMC); five size 1 AWG and five size 3 AWG. What is the MINIMUM allowable trade size IMC required to contain these conductors? a) 1 1โ 2 inches b) 2 inches c) 2 1โ 2 inches d) 4 inches correct answersC: 2 1โ 2 inches Ref: Chpt. 9, Tbl. 4; Chpt. 9, Tbl. 5 Sol:#1 THW = 0.1901 sq. in. x 5 = 0.9505 sq. in. #3 THW = 0.1134 sq. in. x 5 = 0.567 sq. in. Total = 1.5175 sq. in.
