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midnight_442 said:
What is the smallest size wire that can be installed in a parallel permitted by NEC? :rolleyes:
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I agree with 1/0 but I have to ask where are you going with this? Bet this is a test.
 
As already stated, see 310.4, read all of it including the exceptions as Peter points out.

Roger
 
I'm sorry, but I find no wording in the code that says you can't parallel conductors smaller than 1/0....all I find is a rule that specifically permits the paralleling of conductors 1/0 and larger. Where is the rule that says you can't parallel smaller conductors?
Note: I am well aware of the intent of the NEC in this application....just trying to make the point that the code rule doesn't really say what we have all been taught it says.
Don
 
I guess since they said 1/0 AWG and larger shall be permitted, they didn't bother to say 1/0 and smaller shall not be permitted?
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So if the code doesn't say we can, then we can't??? If that is the case the code book needs another 10,000 pages or so!!
Don
 
don_resqcapt19 said:
So if the code doesn't say we can, then we can't??? If that is the case the code book needs another 10,000 pages or so!!
Don
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Seems to be that 1/0 and smaller are exceptions to the rule, unless you have a stamp for #4.... :-? The '1/0 and larger shall be permitted' language would seem to me that 1/0 and smaller would not....

Sure you can - but....
 
This isn't in reply to anyone specific, just thought the 2005 NECH OPINION might be interesting. Specifically the practicallity of paralleling...

20005 NECH starting on page 279
"Section 310.4 permits a practical means for installing large-capacity conductors for feeders or services. The paralleling of two or more conductors in place of using one large conductor to ensure equal division of current depends on a number of factors. Therefore, several conditions must be satisfied so as not to overload any of the individual paralleled conductors. Other than as permitted in 250.122 and the exceptions to 310.4, there does not appear to be any practical need to parallel conductors smaller than 1/0 AWG"
 
Seems to be that 1/0 and smaller are exceptions to the rule,
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While I agree that 310.4 appears to be an exception and that the NEC Manual of Style supports that idea because of the use of the words "shall be permitted", however there is no rule that 310.4 is an exception to.
Don
 
Don, I agreed with your proposal, I believe their failure to accept it was just stupid pigheadedness. :mad:

____________________________________________________________
6-8 Log #2235 NEC-P06 Final Action: Reject
(310.4)
____________________________________________________________
Submitter: Donald A. Ganiere, Ottawa, IL

Recommendation: Revise as follows:
310.4 Conductors in Parallel. Aluminum, coper-clad aluminum, or copper conductors of #1 AWG and smaller, comprising each phase, polarity, neutral, or grounded circuit conductor, shall not be connected in parallel (electrically joined at both ends).

Substantiation: There is no code rule that prevents the installation of conductors smaller than 1/0 AWG in parallel in the current code. The existing rule just specifically permits the use of conductors 1/0 and larger in parallel, but does not prohibit smaller conductors from being paralleled.

Panel Meeting Action: Reject
Panel Statement: The present language meets the requirements of Section
3.1.3 of the NEC Style Manual. Article 310.4 permits conductors 1/0 or larger to be installed in parallel. The general rule is that conductors sized smaller than 1/0 are not permitted to be run in parallel.
Number Eligible to Vote: 11
Ballot Results: Affirmative: 11
____________________________________________________________
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I'd love to see that rule, because 310.4 doesn't contain it. :roll:
 
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