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#92951 - 04/19/05 07:58 PM deration
smokey Offline
Member
Registered: 04/06/01
Posts: 41
Loc: cctxusa
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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#92952 - 04/19/05 08:47 PM Re: deration
Steve T Offline
Member
Registered: 02/14/01
Posts: 306
Loc: Oak Park, IL, USA
Per appendix C of the 99 NEC--16.

Don't forget to derate according to 310-15.
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#92953 - 04/19/05 08:48 PM Re: deration
frenchelectrican Offline
Member
Registered: 02/06/03
Posts: 939
Loc: Wi/ Paris France { France for ...
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
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Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

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#92954 - 04/19/05 08:58 PM Re: deration
Steve T Offline
Member
Registered: 02/14/01
Posts: 306
Loc: Oak Park, IL, USA
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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#92955 - 04/20/05 04:42 AM Re: deration
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
Steve- Just for a smart ass comment EMT is not conduit
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#92956 - 04/20/05 02:44 PM Re: deration
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
George,

One smart--- comment deserves another.
Whether EMT is conduit or not depends on how old you are.

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#92957 - 04/20/05 03:53 PM Re: deration
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
Guess your right Redsy- I'm a little long in the tooth.
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George Little
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#92958 - 04/20/05 06:03 PM Re: deration
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
Although it is technically tubing, the second sentence of 358.24 (2002 NEC) calls it conduit.

Roger
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#92959 - 04/22/05 08:29 PM Re: deration
Steve T Offline
Member
Registered: 02/14/01
Posts: 306
Loc: Oak Park, IL, USA
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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