Residential Wireman Electrician Exam #3 Questions With Correct Answers

What is the MAXIMUM allowable cord length for the cord supplying a cord-and-plug connected dishwasher installed under a kitchen counter in a dwelling unit? a) 11⁄2 feet b) 2 feet c) 3 feet d) 4 feet - Answers D: 4 feet Ref: 422.16(B)(2)(2) What is the MINIMUM size copper SE cable with type THHW insulation that may be used as ungrounded, service-entrance phase conductors for a 150 ampere-rated, 120/240-volt, singlephase, residential service? a) 1/0 AWG b) 1 AWG c) 2 AWG d) 3 AWG - Answers B: 1 AWG Ref: Tbl. 310.15(B)(6) For outlet boxes designed to support ceiling-suspended (paddle) fans that weigh more than _____ pounds, the required marking shall include the maximum weight to be supported. a) 20 b) 30 c) 35 d) 70 - Answers C: 35 Ref: 314.27(D) A connection to a driven or buried grounding electrode shall ______. a) be accessible b) not be required to be accessible c) not permitted to be buried d) be visible - Answers B: not be required to be accessible Ref: 250.68(A), Ex.1 What is the MAXIMUM allowable standard size circuit breaker rating that may be used to protect a size 8 AWG copper NM-B cable supplying an electric range? a) 30 amperes b) 40 amperes c) 50 amperes d) 60 amperes - Answers B: 40 amperes Ref: 334.80; Tbl. 310.16 The MAXIMUM number of size 10 AWG conductors permitted in a 4 inch x 11⁄4 inch octagon metal junction box is _____. a) two b) four c) five d) six - Answers C: five Ref: Tbl. 314.16(A) Determine the MINIMUM number of 15-ampere, 120-volt general lighting branch-circuits required for a dwelling that has 2,600 square feet of habitable space. a) three b) four c) five d) six - Answers C: five Ref: 220.12; Tbl. 220.12 Sol: 2,600 sq. ft. x 3 VA = 7,800 VA (total lighting VA of house) 120 volts x 15 amperes = 1,800 VA (one circuit) 7,800 VA (house)/1,800 VA (one circuit) = 4.3 = 5 circuits When calculating the total load on a dwelling unit, how many VA per square feet must be included for the general purpose receptacle outlets? a) none b) one c) two d) three - Answers A: none Ref: 220.14(J)(1) When calculating the total load for a dwelling unit, what is the MINIMUM load, in VA, that must be added for the two required small appliance branch-circuits? a) 1,200 VA b) 1,500 VA c) 2,400 VA d) 3,000 VA - Answers D: 3,000 VA Ref: 220.52(A) Sol: 1,500VA x 2 circuits required = 3,000VA It shall be permissible to apply a demand factor of _____ percent to the nameplate-rating load of four or more fastened in place electric water heaters in a multi-family dwelling unit. a) 50 b) 75 c) 80 d) 90 - Answers B: 75 Ref: 220.53