OK, Yeah, I know, I'm 1,000 years old.

When I first came in the trade, there was still provision in the DC code to USE the gas pipe, not only for support, but it told us what we had to do to pull wires in it, and how many RW's and TW's we could put in a 3/8" pipe.

I expect it's frowned on now [Linked Image]

BTW, that was back in the ANCIENT early 70's.