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#12 THHN in 3/4" conduit. #170844 11/13/07 05:02 PM
Joined: Aug 2005
Posts: 250
T
Trick440 Offline OP
Member
How are most guys doing this? What I'm hearing is only pull 3 #12 curcuits in 3/4" conduit. Is this what most guys are doing?

Please correct my math. If I pulled more, say 9 current carrying #12 conductors. Than it would be 2400w, derated to 1680w. So I could load the circuit up to 1680w.. (taking into consideration continuous loads)

I would like to know what most guys are doing. My background is residential, commercial is a different animal I'm still trying to grasp.

Thanks.


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Re: #12 THHN in 3/4" conduit. [Re: Trick440] #170846 11/13/07 06:05 PM
Joined: Aug 2005
Posts: 250
T
Trick440 Offline OP
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I did a search and figured it out.

9 current carrying conductors, neutrals count as current carrying.. Would keep #12 rated for 20amps. So 4 circuits in a 3/4"


Shake n Bake
Re: #12 THHN in 3/4" conduit. [Re: Trick440] #170850 11/13/07 08:02 PM
Joined: Jul 2004
Posts: 9,571
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gfretwell Online Content
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You could put 4 multiwire single phase circuits in a conduit. That looks like 8 circuits at 120v.
310.15(B)(4)(a)
If you didn't have any harmonic loads it could be 3 3p wye multiwires for 9 120v circuits.


Greg Fretwell

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