Why can I stuff 24" of pipe with wires and not derate?
I believe the answer lies in coppers ability to readily conduct heat.
Say you have a 24" nipple between a panel and a contactor enclosure, you will have conductors hanging out of both sides of the nipple acting like heat sinks limiting how hot the conductors in the nipple will get.
That's my story and I am sticking to it.
After all there has to be logic behind this exception.
Bob Badger Construction & Maintenance Electrician Massachusetts
yes any pipes included the ell sweep[s] if 24 inch or less but i am still consering about the abilty of heat build up in there.
and for short pipe nipples 24 inch or less.
I have see few place some peoples did use 24 inch pipes and jamed many romax[s] wire in the pipe and i have one call not too long ago and have to replace bunch of romax wire they were brittle in few spots.
Really IMO,, i dont know if they did change the code or not about derating the wires in the nipples at all but i wish they change the length limit to more like 4 inch or less that can clear up some of the mess we have to deal with it ..
merci , marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
Guy's if you want my input into the frey, a nipple as I understand it is a Male-Male Threaded coupling. Ask any plumber what a nipple is, provided they are civilised, that will be thier answer. Cue Russ!.
Let's face it, these days if you're not young, you're old - Red Green