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#52670 - 06/02/05 04:04 AM #6/2 NM Good for 65 amps?  
aldav53  Offline
Member
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
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. ??


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#52671 - 06/02/05 04:28 AM Re: #6/2 NM Good for 65 amps?  
plcnewbie  Offline
Junior Member
Joined: May 2005
Posts: 10
check out 334.80 ampacity NM is 60 degree rated conductor

[This message has been edited by plcnewbie (edited 06-02-2005).]


#52672 - 06/02/05 05:22 AM Re: #6/2 NM Good for 65 amps?  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
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

#52673 - 06/03/05 12:56 AM Re: #6/2 NM Good for 65 amps?  
aldav53  Offline
Member
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
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"

#52674 - 06/03/05 01:56 AM Re: #6/2 NM Good for 65 amps?  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
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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