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Residential Electrician Exam #4 – electrical systems practice exam, wiring methods, and revision material D: No additional electrodes are required. Ref: 250.32(A), Ex. - ✔✔When a single branch-circuit with an equipment grounding conductor is supplying a detached garage from a house, what, if any, additional grounding electrode(s) is/are required at the garage? a) A ground rod and underground metal water pipe. b) A metal underground water pipe only. c) A metal underground water pipe and building steel, if available. d) No additional electrodes are required. B: 10 feet Ref: 230.26 - ✔✔The point of attachment of a service drop to a residence where the voltage is 120 volts to ground is required to be at LEAST _____ above grade. a) 8 feet b) 10 feet c) 12 feet d) 15 feet D: 1⁄ 8 Ref: 430.109(B) - ✔✔The branch-circuit overcurrent protection device shall be permitted to serve as the disconnecting means for stationary motors rated NOT greater than _____ horsepower. a) 2 b) 1 c) 1⁄ 2 d) 1⁄ 8
C: supported by braces or guys Ref: 230.28 - ✔✔When installing an overhead service using a rigid metal conduit (RMC) mast for the support of the service-drop conductors, the mast shall be of adequate strength or be _____ to withstand safely the strain imposed by the service drop. a) at least 2 inches in diameter b) a minimum of 3 inches in diameter c) supported by braces or guys d) less than 4 feet in length A: 5 feet Ref: 680.43(C) - ✔✔When wall switches are installed in the same room with a spa or hot tub, the MINIMUM distance from the switches to the inside wall of the hot tub or spa shall be _____. a) 5 feet b) 10 feet c) 15 feet d) 18 feet C: 20 feet Ref: 680.22(A)(4) - ✔✔All 15- and 20-ampere, single-phase, 125-volt receptacle outlets located at LEAST _____ from the inside walls of a swimming pool shall be provided with GFCI protection. a) 10 feet b) 15 feet c) 20 feet d) 25 feet
a) if the outlet has a weatherproof cover b) if the outlet is GFCI protected c) if the outlet has a weatherproof cover and is GFCI protected d) never C: face-up Ref: 406.4(E) - ✔✔Receptacle outlets installed in the _____ position in countertops are prohibited. a) vertical b) horizontal c) face-up d) all of these are acceptable A: 24 inches Ref: 210.52(C)(1) - ✔✔Receptacle outlets in a kitchen of a residence that are to serve countertop surfaces shall be installed so that no point along the wall line is more than _____ when measured horizontal from a receptacle in that space. a) 24 inches b) 18 inches c) 36 inches d) 48 inches B: 125 Ref: 426.4; 210.19(A)(1) - ✔✔The ampacity of branch-circuit conductors and the rating or setting of overcurrent protective devices supplying fixed outdoor electric deicing equipment, shall NOT be less than _____ percent of the full load current of the equipment. a) 100
b) 125 c) 80 d) 150 B: 18 inches Ref: Tbl. 300.5, Col. 2 - ✔✔When an intermediate metal conduit (IMC) contains conductors of 600 volts or less and is buried under a gravel driveway of a one family dwelling, the IMC must be buried at LEAST _____. a) 12 inches b) 18 inches c) 24 inches d) 30 inches C: at the top and bottom of the stairs if there are more than six steps Ref: 210.70(A)(2)(c) - ✔✔Disregarding exceptions, where residential lighting outlets are installed in interior stairways, there shall be a wall switch provided ______. a) near the stairs b) every seven steps c) at the top and bottom of the stairs if there are more than six steps d) at any convenient location D: 2 feet Ref: 230.54(C), Ex. - ✔✔Where it is impractical to locate the service head or gooseneck above the point of attachment of the service drop conductors, the service head or gooseneck shall be permitted not further than _____ from the point of attachment. a) 3 feet b) 4 feet
D: be provided with GFCI protection Ref: 210.8(A)(7) - ✔✔In dwelling units, all 125 volt, single-phase, 15 and 20 ampere receptacle outlets installed within 6 feet of the outside edge of a sink in a laundry room shall _____. a) have a weatherproof cover b) have AFCI protection c) be a single receptacle d) be provided with GFCI protection B: 2 Ref: 334.104 - ✔✔The largest size copper conductor permitted for nonmetallic sheathed cable (NM) is size _____ AWG. a) 4 b) 2 c) 6 d) 1 C: 2.25 cubic inches Ref: Tbl. 314.16(B) - ✔✔For the purpose of determining box fill, size 12 AWG copper conductors with THHN insulation are to be calculated at _____ per conductor in the box. a) 1.75 cubic inches b) 2.00 cubic inches c) 2.25 cubic inches d) 2.50 cubic inches B: 41⁄2 feet Ref: 334.3 - ✔✔What is the MAXIMUM distance allowed between supports when installing type NM cable?
a) 3 feet b) 41⁄2 feet c) 6 feet d) 10 feet A: 8 AWG copper Ref: 230.31(B) - ✔✔Disregarding exceptions, the MINIMUM size underground service lateral conductors permitted by the NEC® is _____. a) 8 AWG copper b) 6 AWG copper c) 4 AWG aluminum d) 2 AWG aluminum B: two Ref: Tbl. 314.16(B); 314.16(B)(4) Sol: 18 cu. in. (box) / 2.25 cu. in. (#12 wire) = 8 wires (allowable fill) 8 wires (allowable fill) - 2 wires (device) = 6 wires may be added Size 12/2 with ground NM = 3 wires in cable 6 wires (allowed) / 3 wires per cable = 2 size 12 AWG NM cables are permitted in the box - ✔✔How many size 12/2 AWG with ground, type NM cables are permitted to be installed in an outlet box with a total volume of 18 cubic inches when the box contains a duplex receptacle outlet? a) one b) two c) three d) four
