310.15(B)(6) and NM

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Re: 310.15(B)(6) and NM

Originally posted by curt swartz:
JW, even if the terminals are rated for 75C you can not exceed the ampacity listed in the 60C column if type NM cable is used.
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would you please tell me where you find this?
 
Re: 310.15(B)(6) and NM

Originally posted by electrofelon:
n other words, forget what you think a main power feeder is, because (for this section) it is the feeder(s) between the main disconnect and the lighting and appliance branch-circuit panelboard(s).
Ok maybe I am totally over-analyzing this but it does seem to define 'main power feeder' for us.
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Care needs to be taken as to where the ?main lighting and equipment panel board? is located. The first panel after the main breaker that has 10% of its circuits at 30 amps or less and uses a neutral is the Main Lighting and Equipment Panel Board. If the panel that the main breaker is in has 10% lighting and appliance branch circuit then it is the main lighting and appliance panel board and no other panel can claim this title and is just a sub panel.
 
Re: 310.15(B)(6) and NM

Originally posted by georgestolz:
Scott, it doesn't have to be a main feeder.
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Wrong!

Didn't bother to read the code, just based that statement on the title of the table.

My apologies. Good catch, JW. :)
 
Re: 310.15(B)(6) and NM

334.80. Ampacity. . The ampacity of Types NM, NMC, and
NMS cable shall be determined in accordance with 310.15.
The ampacity shall be in accordance with the 60?C (140?F)
conductor temperature rating. The 90?C (194?F) rating
shall be permitted to be used for ampacity derating purposes,
provided the final derated ampacity does not exceed
that for a 60?C (140?F) rated conductor.
 
Re: 310.15(B)(6) and NM

thanks Curt. I have read this 100s of times and still couldn't see it. to hung up on 110

[ March 13, 2005, 09:47 AM: Message edited by: jwelectric ]
 
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