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Joined: Apr 2001
Posts: 41
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how many #12 thhn"s can i legally squeeze in a 3/4 in conduit? the conductors are feeding plugs and lights in a commercial building?
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Joined: Feb 2001
Posts: 308
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Per appendix C of the 99 NEC--16.
Don't forget to derate according to 310-15.
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Joined: Feb 2003
Posts: 939
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i will say 12 to 15 but depending on which kind of conduct pipe you are using and keep in mind you have to derated also because it will be more than 3 current carry conductors
Merci, Marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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Joined: Feb 2001
Posts: 308
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Oh yeah--that 16 is in EMT which I assumed you would be using. I know us Chicago guys forget about that other stuff.
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Joined: Jan 2004
Posts: 1,507
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Steve- Just for a smart ass comment EMT is not conduit ![[Linked Image]](https://www.electrical-contractor.net/ubb/smile.gif)
George Little
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Joined: Mar 2001
Posts: 2,056
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George, One smart--- comment deserves another. Whether EMT is conduit or not depends on how old you are. ![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif)
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Joined: Jan 2004
Posts: 1,507
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Guess your right Redsy- I'm a little long in the tooth.
George Little
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Joined: May 2002
Posts: 1,716
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Although it is technically tubing, the second sentence of 358.24 (2002 NEC) calls it conduit. Roger
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Joined: Feb 2001
Posts: 308
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Thanks Roger for saving my butt!! I really wish they would make a clear definitive distinction between the two though. It would have saved us all at least a combined 5 minutes of typing.
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Posts: 61
Joined: August 2007
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