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Max current load #130742 12/01/06 08:46 AM
Joined: Mar 2005
Posts: 3
J
JakeJ1 Offline OP
Junior Member
Not necessarily an NEC/code question. If I have two 10Awg circuits using 10/3 with ground MC cable and I put these together in parallel, what is the max current load that this will support?

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Re: Max current load #130743 12/01/06 10:13 AM
Joined: Dec 2002
Posts: 317
S
sabrown Offline
Member
Article 310.4 discusses conductors in parallel. Using the information there we find that paralleling #10 is only allowed in limited circumstances and based on Exception 1 (b) we find that parallel #10 (referring to table 310.16) carry 30 amps at 60 degree C (no increase in ampacity).

Re: Max current load #130744 12/01/06 11:25 AM
Joined: Mar 2005
Posts: 3
J
JakeJ1 Offline OP
Junior Member
Thanks for the prompt reply. I find it interesting that the overall ampacity will not increase when two like cables are placed in parallel.


Thanks again..

Re: Max current load #130745 12/01/06 04:34 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
That is not always the case.

2 cables with 1/0 or larger conductors will have double the ampacity. 3 cables with 1/0 or larger will have triple the ampacity.

In general there is little benefit from paralleling conductors smaller than 1/0 and you can only do it for specific installations.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

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