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07-12-2008, 12:23 AM
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#46
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Power Gen/RS Engineer
Join Date: Jun 2006
Location: Oak Park, Illinois
Posts: 695
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running wires in a conduit
Quote:
Originally Posted by analogmusicman
I'm baaaaak!  bet y'all thought I left the country,huh? (some wish I HAD!)
anyway,I've been reading that a kitchen MUST have a 20A circuit for the fridge,micro,disposer. well,outside of that big 50A circuit I'm running for the range, only 15A circuits are available so, I'm wondering if that 3/4 EMT will hold a couple more wires for a 20A circuit. total wires in the 3/4 would be 3 #6,1 #8 and 2 #12 (I;m assuming #12 for a 20A circuit) so what do you think?
BTW: getting close,the electrician comes over on Mon. to upgrade the panel to 150A then I'll be able to start putting up conduit and pulling wires...my wife can't wait! 
tnx, |
Put in a length of 1" emt. Just my gut (I'm not consulting tables here). If you're gonna run pipe, bigger is always better. And don't go by the NEC tables. Most electricians will brain any designer that takes it to the limit specified as being "acceptable"
Just my opinion,
Jimmy
__________________
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves,"You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." - George Carlin
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07-12-2008, 09:31 AM
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#47
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Licensed Electrician
Join Date: Feb 2008
Location: central wisconsin
Posts: 981
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running wires in a conduit
Quote:
Originally Posted by analogmusicman
I'm wondering if that 3/4 EMT will hold a couple more wires for a 20A circuit. total wires in the 3/4 would be 3 #6,1 #8 and 2 #12
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Assuming THWN/THHN you are over the limit for 3/4 EMT. Per Chap 9 NEC.
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John
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07-12-2008, 02:12 PM
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#48
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Member
Join Date: Feb 2008
Location: colorado springs
Posts: 577
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running wires in a conduit
according to the Belden chart, I'm on the "hairy edge"! total area of 3/4 emt is .21331 sq. in. and my wires come in at .2144 sq. in. (for a 40% fill) any leeway here or should I just "bite the bullet" and go to 1" emt?
tnx,
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07-12-2008, 04:13 PM
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#49
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Power Gen/RS Engineer
Join Date: Jun 2006
Location: Oak Park, Illinois
Posts: 695
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running wires in a conduit
Quote:
Originally Posted by analogmusicman
according to the Belden chart, I'm on the "hairy edge"! total area of 3/4 emt is .21331 sq. in. and my wires come in at .2144 sq. in. (for a 40% fill) any leeway here or should I just "bite the bullet" and go to 1" emt?
tnx,
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Analog-
Go with 1" regardless. You'll be happy you did. Most electricians will be happy to tell you that the fill tables indicate what is allowed but not necessarily practical from an install/pulling point of view. For instance, per Chapter 9 annex C, you can install up to 9 #12 THHN wires in a 1/2" stick of emt but it'd be no picnic.
__________________
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves,"You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." - George Carlin
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07-12-2008, 10:02 PM
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#50
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Member
Join Date: Feb 2008
Location: colorado springs
Posts: 577
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running wires in a conduit
well,ok, "BIG",you convinced me,darn it! this definitely throws a "monkey wrench" into the works since 1" emt and fittings are double over 3/4 inch and that emt looks tougher to bend. the electrician coming over on mon. to upgrade my panel just might be getting some more work!
tnx,
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07-13-2008, 09:49 AM
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#51
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Licensed Electrician
Join Date: Feb 2008
Location: central wisconsin
Posts: 981
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running wires in a conduit
Quote:
Originally Posted by analogmusicman
according to the Belden chart, I'm on the "hairy edge"! total area of 3/4 emt is .21331 sq. in. and my wires come in at .2144 sq. in. (for a 40% fill) any leeway here or should I just "bite the bullet" and go to 1" emt?
tnx,
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My numbers come to .213 and .2153. These are from the NEC book. And that is what the electrical inspector will use. This seems like a very small thing. .002 doesn't sound like enough to make a difference. But what if you install the whole thing and the inspector red tags it and tells you to increase the size of the conduit? I would go with the 1" conduit. Or use EMT for the entire run and eliminate the #8 ground. But it's your call.
__________________
John
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