Residential Electrician Exam 3 - Q & A

Residential Electrician Exam 3 - Q & A A 240-volt, single-phase, 30-ampere rated, electric clothes dryer has a VA rating of _____. a) 5,000 VA b) 7,200 VA c) 8,000 VA d) 15,400 VA Sol: P = I x E P = 30 amperes x 240 volts = 7,200 VA Type XHHW insulated conductors are permitted to be used in _____. a) dry locations only b) wet locations only c) dry or damp locations only d) dry, damp, or wet locations Ref: Tbl. 310.13(A); 310.8(B) and (C)(2) When two single-pole switches are mounted on the same strap, the number of conductors permitted in the box shall be reduced by _____ conductor(s). a) one b) two c) three d) four Ref: 314.16(B)(4) When doing residential service and feeder calculations, electric clothes dryers are to be calculated at a MINIMUM of _____ watts (VA) or the nameplate rating, whichever is larger. a) 3,000 b) 4,500 c) 5,000 d) 6,000 Ref: 220.54 The rating of any single cord-and-plug connected appliance supplied by a 30-ampere rated branch-circuit shall not exceed _____. a) 30 amperes b) 27 amperes c) 24 amperes d) 16 amperes Ref: 210.23(B) Sol: 30 amperes x 80 percent = 24 amperes In general, all receptacles installed on 15- and 20-ampere, 120- volt branch-circuits are required to