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Joined: Jan 2004
Posts: 9
Junior Member
Hello to all. I have been lurking on this board for some time, and now I finally have a question. Do the conductor ampacity tables of the NEC apply to DC systems? I would think so since it only states voltage ratings, and does not specify AC only. Am I way off in my thinking? I have worked with DC motors and control, but never had to size anything.

Joined: Dec 2003
Posts: 886
Yes it does.


Joined: Jun 2003
Posts: 1,143
I would agree that it does, since the NEC refers to signal and control circuits, as well as fire alarm circuits. These all (can be designed to) operate on DC.

Joined: Jan 2004
Posts: 9
Junior Member
Thanks, I was starting to wonder.


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