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deration #92951
04/19/05 09:58 PM
04/19/05 09:58 PM
S
smokey  Offline OP
Member
Joined: Apr 2001
Posts: 41
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?

2017 / 2014 NEC & Related Books and Study Guides
Re: deration #92952
04/19/05 10:47 PM
04/19/05 10:47 PM
S
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
Per appendix C of the 99 NEC--16.

Don't forget to derate according to 310-15.

Re: deration #92953
04/19/05 10:48 PM
04/19/05 10:48 PM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
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


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: deration #92954
04/19/05 10:58 PM
04/19/05 10:58 PM
S
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
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.

Re: deration #92955
04/20/05 06:42 AM
04/20/05 06:42 AM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Steve- Just for a smart ass comment EMT is not conduit [Linked Image]


George Little
Re: deration #92956
04/20/05 04:44 PM
04/20/05 04:44 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
George,

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

[Linked Image]

Re: deration #92957
04/20/05 05:53 PM
04/20/05 05:53 PM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Guess your right Redsy- I'm a little long in the tooth.


George Little
Re: deration #92958
04/20/05 08:03 PM
04/20/05 08:03 PM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Although it is technically tubing, the second sentence of 358.24 (2002 NEC) calls it conduit. [Linked Image]

Roger

Re: deration #92959
04/22/05 10:29 PM
04/22/05 10:29 PM
S
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
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. [Linked Image]


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