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branch electric box question rider89 08-21-2005
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Posted by rider89 on August 21, 2005, 6:30 pm


wanting to feed a branch box with a 60a breaker (#6 copper) thru EMT.

This may be a stupid question, but is there anything in the NEC to prohibit
using double #10's to get the amperage?
Reason is I have plenty of (free) #10 on hand and tube capacity is slightly
better with #10's.

thanks
bill



PexSupply PEX Tools 468x60
Posted by rider89 on August 21, 2005, 6:49 pm


I guess derating would apply (6x 10ga THHN +8ga grounding) , in which case a
50a breaker may suffice?


bill


> wanting to feed a branch box with a 60a breaker (#6 copper) thru EMT.
>
> This may be a stupid question, but is there anything in the NEC to
> prohibit using double #10's to get the amperage?
> Reason is I have plenty of (free) #10 on hand and tube capacity is
> slightly better with #10's.
>
> thanks
> bill
>



Posted by Doug Miller on August 21, 2005, 7:18 pm


>wanting to feed a branch box with a 60a breaker (#6 copper) thru EMT.
>
>This may be a stupid question, but is there anything in the NEC to prohibit
>using double #10's to get the amperage?

Yes, there is. Section 310-4 explicitly *permits* parallelling conductors of
size 1/0 or *larger*, and thus by implication prohibits it for smaller
conductors.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.


Posted by rider89 on August 21, 2005, 7:49 pm


bummer..

thanks doug

bill

>>wanting to feed a branch box with a 60a breaker (#6 copper) thru EMT.
>>
>>This may be a stupid question, but is there anything in the NEC to
>>prohibit
>>using double #10's to get the amperage?
>
> Yes, there is. Section 310-4 explicitly *permits* parallelling conductors
> of
> size 1/0 or *larger*, and thus by implication prohibits it for smaller
> conductors.
>
> --
> Regards,
> Doug Miller (alphageek at milmac dot com)
>
> It's time to throw all their damned tea in the harbor again.



Posted by Sasha on August 22, 2005, 5:12 am


Just wonder why parallel wires are permitted for #10 and lower and
prohibited for smaller wire sizes?



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