Question

D. trade size 1 1/2 (41). Atrade size 4 (21). B.trade size 1 (27). (53). Ctrade size 1 1/4(35). E. trade size 2 Code reference 29. The general use 125-volt receptacles in a commercial building are supplied by 20- ampere rated multiwire branch-circuits with three ungrounded conductors anda common neutral from a 208/120-volt, 4-wire, 3-phase electrical system. The con ductors for nine circuits are run in a single raceway to an area of the building includ ing nine ungrounded conductors and three neutral conductors. For the purpose of applying adjustment factors to determine the allowable ampacity of the conductors, the number of current-carrying conductors for this set of circuits is: A. six. B. nine. C. ten. D. twelve. E. sixteen. Code reference 30. A 140 ft (42.7 m) straight run of trade size 1 (27) PVC Type Rigid Nonmetallic Conduit is installed in an unheated parking structure where the temperature through out the year is likely to change up to 120F (66.7°C). The change in length for this run of PVC Conduit over a season will be: A. 3.48 in. (88 mm). B. 4.87 in. (124 mm). C 5.12 in. (130mm) D. 5.84 in. (148 mm). E. 6.82 in. (173 mm). Code reference 31 A pull box has a trade size 4 (103) conduit entering one side and trade sizes 2 (53) and 3 (78) conduit entering the adjacent side as shown in Figure 2.46 on the next page. Three size 4/0 AWG conductors run from the trade size 4 (103) to the trade size 3 (78) conduits. Three size 6 AWG and eight size 12 AWG conductors run from the trade size 4 (103) to the trade size 2 (53) conduits. The minimum distance per mitted from the trade size 3 (78) conduit to the opposite wall (dimension A) is: A 20 in. (521 mm) B. 22 in. (559 mm) C. 24 in. (618 mm). D. 26 in. (660 mm) E. 30 in. (762 mm). Code reference

Answer 1

/2のㅈs/ :約.PE 23 314-244) (2)--be NEC ams