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 #12 THHN in 3/4" conduit.
#170844
11/13/07 05:02 PM
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Joined: Aug 2005
Posts: 250
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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.
Shake n Bake
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Re: #12 THHN in 3/4" conduit.
[Re: Trick440]
#170846
11/13/07 06:05 PM
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Joined: Aug 2005
Posts: 250
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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
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Re: #12 THHN in 3/4" conduit.
[Re: Trick440]
#170850
11/13/07 08:02 PM
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Joined: Jul 2004
Posts: 9,571
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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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