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 #6/2 NM Good for 65 amps?
#52670
06/02/05 04:04 AM
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Joined: Aug 2001
Posts: 545
OP
Member
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The code book says #6 THHN is good for 65 amps. Is 6/2 NM considered THHN? Its not marked that. How many amps is 6/2 NM good for? At Home Depot they have 6/2 labeled rated at 50 amps. ??
The Golden Rule - "The man with the gold makes the rule"
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Re: #6/2 NM Good for 65 amps?
#52671
06/02/05 04:28 AM
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Joined: May 2005
Posts: 10
Junior Member
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check out 334.80 ampacity NM is 60 degree rated conductor
[This message has been edited by plcnewbie (edited 06-02-2005).]
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 Re: #6/2 NM Good for 65 amps?
#52672
06/02/05 05:22 AM
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Joined: Jan 2003
Posts: 4,391
Moderator
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Because of 334.80 6/2 NM is rated 55 amps.
With the use of 240.4(B) many times you can use a 60 amp breaker with 6/2 NM.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Re: #6/2 NM Good for 65 amps?
#52673
06/03/05 12:56 AM
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Joined: Aug 2001
Posts: 545
OP
Member
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Couldn't find the code art. 6/2 NM is supposed to be 90 deg rated, which is the same as THHN, which would be 65 amps.
The Golden Rule - "The man with the gold makes the rule"
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Re: #6/2 NM Good for 65 amps?
#52674
06/03/05 01:56 AM
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Joined: Jul 2004
Posts: 9,513
Member
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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.
Greg Fretwell
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