Journeyman Electrician CH #4 Assessment Test Questions and Answers

Journeyman Electrician CH #4 Assessment Test Questions and Answers Class 3 single-conductors shall NOT be smaller than _____. a) 18 AWG b) 16 AWG c) 14 AWG d) 20 AWG - Answer-A: 18 AWG Ref: 725.179(H) Given: an office building has a 208Y/120 volt, three-phase service with a balanced net computed load of 90 kVA. What is the current each ungrounded conductor carries at full load? a) 188 amperes b) 250 amperes c) 433 amperes d) 750 amperes - Answer-B: 250 amperes Ref: Trade and General Knowledge; 3-Phase Current Formula Sol: I = Power / (E x 1.732) I = (90 kVA x 1,000) / (208 x 1.732) I = 90,000 / 360.25 = 250 amperes When grounding the structural reinforcing steel of a swimming pool, what is the smallest size grounding conductor permitted for this installation? a) 12 AWG b) 10 AWG c) 8 AWG d) 6 AWG - Answer-C: 8 AWG Ref: 680.26(B)(1)(a) and (b) A surge-protective device (SPD) is a protective device for _____.