Is there anything in the NEC which prohibits installing cables--NM, AC, MC, TC, etc...in properly sized conduits? While I don't think it's a good practice to put some of these (like AC or MC) in a conduit, as long as it doesn't exceed the wirefill area for the particlar conduit, is it OK? I'm not concerned at this point with "why the heck would you want to put MC cable in a conduit?" This discussion came up at work, where we ran type TC cable in a tray and then went into a conduit for 100' or so on the outside of a building, then another 40' underground, then back up and into another building. I believe thee is no NEC prohibition to installing these types of cables in pipe as long as everything is properly sized, grounded and terminated.
