Journeyman Electrician # 1

A listed instantaneous water heater shall be permitted to be subdivided into circuits protected at NOT more than _____. a) 60 amperes b) 100 amperes c) 120 amperes d) 150 amperes

D: 150 amperes Ref: 422.11(F)(3)

The NEC defines a continuous-load to be a load where the maximum current on the circuit is expected to continue for at least _____ hours or more. a) 3 b) 4 c) 6 d) 8

A: 3 REf: Art. 100

Which of the following listed conduits does the NEC permit to enclose conductors feeding wet-niche underwater pool lights? a) electrical metallic tubing (EMT) b) electrical nonmetallic tubing (ENT) c) galvanized rigid metal conduit (RMC) d) schedule 40 rigid polyvinyl chloride conduit (PVC)

D: schedule 40 rigid polyvinyl chloride conduit (PVC) Ref: 680.23(B)(2)

A single-phase, 240-volt, 15 kVA generator may have a current load of not more than _____ amperes per line. a) 62.5 b) 31.25 c) 41.66 d) 52.5

A: 62.50 Ref: Current Formula Sol: I = P/E I = (15 x 1,000) / 240 volts I = 15,000 / 240 volts = 62.50 amperes

Which of the following listed types of batteries is NOT permitted for use as a source of power for emergency systems? a) automotive b) lead acid type c) alkali type d) all of these

A: automotive Ref: 700.12(A)

The interior of enclosures or raceways installed underground shall be considered to be a _____. a) wet location b) damp location c) moist location d) dry location

A: wet location Ref: 300.5(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

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)

Determine the MINIMUM size THW copper branch-circuit conductors required by the NEC to supply a three-phase, continuous duty, AC motor that has a full-load current of 70 amperes. Assume all terminations to be rated at 75°C. a) 1 AWG b) 2 AWG c) 3 AWG d) 4 AWG

C: 3 AWG Ref: 430.22(A); Tbl. 310.16 Sol: FLC of motor - 70 amperes x 125% = 87.5 amperes Size 3 AWG THW conductors with an ampacity of 100 amperes should be selected.

Underground wiring is not permitted under a swimming pool or within _____ of the pool unless the wiring is supplying pool equipment. a) 10 feet b) 6 feet c) 5 feet d) 8 feet

C: 5 feet Ref: 680.1

Determine the MAXIMUM allowable ampacity of a size 1/0 AWG THW copper current-carrying conductor installed in a common raceway with three other current-carrying conductors of the same size. Ambilent temperature is 86°F. a) 150 amperes b) 105 amperes c) 112 amperes d) 120 amperes

D: 120 amperes Ref: Tbl. 310.16; Tbl. 310.15(B)(2)(a) Sol: Size 1/0 AWG THW ampacity (before derating) = 150 amperes 150 amperes x 80% (adjustment factor) = 120 amperes

The continuity of the grounding conductor system for portable electrical carnival equipment shall 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

D: each time the equipment is connected Ref: 525.32

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

A plate type grounding electrode shall be installed below the surface of the earth NOT less than _____. a) 24 inches b) 30 inches c) 36 inches d) 48 inches

B: 30 inches Ref: 250.53(H)

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

When branch-circuit conductors are contained inside a ballast compartment and they are within 3 inches of the ballast, the conductors shall have a temperature rating of at LEAST _____. a) 105 degrees C b) 90 degrees C c) 75 degrees C d) 60 degrees C

B: 90 degrees C Ref: 410.68

In guest rooms or guest suites of hotels and motels, and sleeping rooms in dormitories, at LEAST _____ general purpose receptacle(s) installed in the room is/are required to be readily accessible. a) one b) two c) three d) all

B: two Ref: 210.60(B)

The MINIMUM rating for a service disconnecting means for a building, other than a one-family dwelling, consisting of three, two-wire circuits shall be _____. a) 15 amperes b) 30 amperes c) 60 amperes d) 100 amperes

C: 60 amperes Ref: 230.79(D)

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)

Class _____ locations are those that are hazardous because of the presence of easily ignitible fibers or materials producing combustible flyings. a) I b) II c) III d) IV

C: III Ref: 500.5(D)

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 conduit entering the box. a) six b) four c) eight d) twelve

C: eight Ref: 314.28(A)(1)

Determine the MAXIMUM number of size 14 AWG THHN conductors permitted to be installed in a trade size 3⁄8 inch flexible metal conduit (FMC) that contains a bare size 14 AWG grounding conductor when the flex has external fittings. a) two b) three c) four d) five

C: four Ref: Tbl. 348.22

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)

In general, when a size 4 AWG or larger insulated conductor enters a panelboard, cabinet, or enclosure, which of the following must be provided? a) a bonding jumper b) a grounding clip c) an insulated bushing d) an insulated grounding conductor

C: an insulated bushing Ref: 300.4(G)

In general, all of the following wiring methods listed are permitted to be used as a feeder for temporary wiring on a construction site EXCEPT _____. a) NM cable b) NMC cable c) type PD cord d) type SJO cord

C: type PD cord Ref: 590.4(B); Tbl. 400.4