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#92951 04/19/05 10:58 PM
Joined: Apr 2001
Posts: 41
S
smokey Offline OP
Member
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 11:47 PM
Joined: Feb 2001
Posts: 308
S
Member
Per appendix C of the 99 NEC--16.

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

#92953 04/19/05 11:48 PM
Joined: Feb 2003
Posts: 939
F
Member
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?)

#92954 04/19/05 11:58 PM
Joined: Feb 2001
Posts: 308
S
Member
Oh yeah--that 16 is in EMT which I assumed you would be using. I know us Chicago guys forget about that other stuff.

#92955 04/20/05 07:42 AM
Joined: Jan 2004
Posts: 1,507
G
Member
Steve- Just for a smart ass comment EMT is not conduit [Linked Image]


George Little
#92956 04/20/05 05:44 PM
Joined: Mar 2001
Posts: 2,056
R
Member
George,

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

[Linked Image]

#92957 04/20/05 06:53 PM
Joined: Jan 2004
Posts: 1,507
G
Member
Guess your right Redsy- I'm a little long in the tooth.


George Little
#92958 04/20/05 09:03 PM
Joined: May 2002
Posts: 1,716
R
Member
Although it is technically tubing, the second sentence of 358.24 (2002 NEC) calls it conduit. [Linked Image]

Roger

#92959 04/22/05 11:29 PM
Joined: Feb 2001
Posts: 308
S
Member
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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