1. What size rigid metal conduit (RMC) is required to enclose 18 No. 10 THWN copper conductors? (a) 3/4 in. (b) 1 in. (c) 1 1/4 in. (d) 1½ in. 2. What size electrical metallic tubing (EMT) is required ...

Explanation: A change to the 2023 NEC in Sec. 342.20 now permits a maximum size of 6 in. in-lieu of the previous maximum size of 4 in. for intermediate metal conduit. A similar change to Sec. 358.20 ...