OK, I'm lost as to the 5 wire circuit in the '62 Code (per Al's post).
Are they talking about switch legs or something? I've seen buildings wired in this manner, but it didn't always reference an A, B, or C Ø. (much less a "D"Ø).
It seemed that if you put 2 wires in a conduit it was black/wh, if 3 then blk/red/wh., etc. [Linked Image]