Download Residential Electrician Exam #1 Questions with Complete Solutions and more Exams Nursing in PDF only on Docsity!
Residential Electrician Exam #1 Questions
With Complete Solutions
Ferrous metal enclosures for grounding electrode conductors shall be _____. a) electrically continuous b) electrically isolated c) not permitted d) rigid metal conduit (RMC) only correct answer: A: electrically continuous Ref: 250.64(E) Unless listed for the control of other loads, general use dimmer switches shall only be used to control _____. a) switched receptacles for cord-connected incandescent luminaires b) permanently installed incandescent luminaires c) ceiling fans with luminaires d) holiday decorative lighting correct answer: B: permanently installed incandescent luminaires Ref: 404.14(E) All 125-volt, single-phase, 15- and 20-ampere receptacles installed in residential garages shall be _____. I) protected by a listed arc-fault interrupter II) provided with ground-fault circuit-interrupter protection a) I only b) II only c) both I and II
d) neither I nor II correct answer: B: II only Ref: 210.8(A)(2); 210.12(B) The MAXIMUM allowable ampacity of size 18 AWG fixture wire is _____ amperes. a) 12 b) 10 c) 8 d) 6 correct answer: D: 6 Ref: Tbl. 402. A receptacle outlet installed for a gas or electric clothes dryer in the laundry room of a dwelling unit must be installed within at LEAST _____ feet of the intended location of the dryer. a) 6 b) 4 c) 10 d) 3 correct answer: A: 6 Ref: 210.50(C) Which of the following listed conductors are required to have overcurrent protection on a residential electric service? a) grounding conductors b) bonding conductors c) identified conductors d) ungrounded conductors correct answer: D: ungrounded conductors Ref: 290.
A 150 kVA, single-phase transformer having a secondary voltage of 120/240 is to be installed at a multi-family dwelling. The current available at the secondary is _____ amperes. a) 329 b) 421 c) 625 d) 729 correct answer: C: 625 Sol: I = P/E I = 150,000 va / 240 volts I = 625 amperes When the heating, air-conditioning, or refrigeration equipment is installed on the roof of an apartment complex, a 125-volt, 15- or 20-ampere rated receptacle outlet _____. a) is not required by the NEC b) may be connected to the line side of the equipment disconnecting means, if the outlet is GFCI protected c) shall be located on the same level and within 25 feet of the heating, air-conditioning, or refrigeration equipment d) shall be installed on the roof where the equipment is located and not more than 75 feet from each unit correct answer: C: shall be located on the same level and within 25 feet of the heating, air-conditioning, or refrigeration equipment Ref: 210. The MINIMUM number of 120-volt, 15-ampere, general lighting branch circuits required for a dwelling that has 70 feet x 30 feet of habitable space is _____. a) two b) three
c) four d) five correct answer: C: four Ref: Tbl. 220. Sol: 70' x 30' = 2,100 sq. ft. x 3 va = 6,300 va (house) 120 volts x 15 amperes = 1,800 va (one circuit) 6,300 va / 1,800 va = 3. = 4 circuits Receptacle outlets on a 20-ampere rated small appliance branch- circuit serving kitchen countertops in a dwelling unit are to be rated _____. a) I only b) II only c) either I or II d) neither I nor II correct answer: C: either I or II Ref: Tbl. 210.21(B)(3) In general, service conductors installed as open conductors shall have a clearance of not less than _____ from windows that are designed to be opened, doors, porches or balconies. a) 6 feet b) 8 feet c) 5 feet d) 3 feet correct answer: D: 3 feet Ref: 230.9(A) Given: a 120-volt lighting branch-circuit is to supply only six 100 watt, 120-volt, incandescent luminaires. Determine the total current on this branch-circuit. a) 30 amperes
d) 1 1⁄4 inches correct answer: C: 15/16 inch Ref: 314.24(B) Metallic surface type cabinets for electrical equipment located in damp or wet locations shall be mounted so there is at LEAST _____ air space between the cabinet and the wall or other supporting surface. a) 1⁄8 inch b) 1⁄4 inch c) 3⁄8 inch d) 1⁄2 inch correct answer: B: 1/4 inch Ref: 312. In dwelling units, hallways of _____ feet or more in length are required to have at least one-, 15- or 20-ampere rated 120-volt receptacle outlet. a) 10 b) 12 c) 15 d) 20 correct answer: A: 10 Ref: 210.52(H) Receptacles 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 _____ inches, measured horizontally from a receptacle outlet in that space. a) 24 b) 18 c) 36 d) 48 correct answer: A: 24 Ref: 210.52(C)(1)
Given: you are to install a 20-ampere, 120-volt, GFCI protected, buried, UF cable branch-circuit that supplies landscape lighting for a residence. The UF cable is required to have a ground cover of at LEAST _____. a) 6 inches b) 12 inches c) 18 inches d) 24 inches correct answer: B: 12 inches Ref: Tbl. 300.5, Col. 4 Where nonmetallic sheathed cable (NM) is run at angles with joists in unfinished basements, the smallest three conductor cable permitted to be installed directly to the lower edges of the joists is size _____. a) 12 AWG b) 10 AWG c) 8 AWG d) 6 AWG correct answer: C: 8 AWG Ref: 334.15(C) When exceptions are not to be taken into consideration, the ungrounded conductor of an electrical branch-circuit may be identified by _____. a) white- or gray-colored insulation b) bare or green-colored insulation c) only gray-colored insulation d) black- or red-colored insulation correct answer: D: black- or red-colored insulation Ref: 310.12(C); 200.6(A)-(E); 250.
