The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Members: Did you know?
by Admin
37 minutes 25 seconds ago
Safety at heights?
by HotLine1
Yesterday at 08:51 PM
International Wire Colour Codes
by Texas_Ranger
Yesterday at 03:29 PM
Looking for older post
by Texas_Ranger
Yesterday at 03:22 PM
Last time to chat here
by Trumpy
01/20/17 11:41 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 36
HotLine1 20
Ruben Rocha 17
gfretwell 16
Trumpy 15
Who's Online
1 registered (Admin), 81 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#52670 - 06/02/05 01:04 AM #6/2 NM Good for 65 amps?
aldav53 Offline
Member
Registered: 08/22/01
Posts: 547
Loc: 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. ??
_________________________
The Golden Rule - "The man with the gold makes the rule"
Top
Work Gear for Electricians and the Trades
#52671 - 06/02/05 01:28 AM Re: #6/2 NM Good for 65 amps?
plcnewbie Offline
Junior Member
Registered: 05/18/05
Posts: 10
check out 334.80 ampacity NM is 60 degree rated conductor

[This message has been edited by plcnewbie (edited 06-02-2005).]
Top
#52672 - 06/02/05 02:22 AM Re: #6/2 NM Good for 65 amps?
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: 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
Top
#52673 - 06/02/05 09:56 PM Re: #6/2 NM Good for 65 amps?
aldav53 Offline
Member
Registered: 08/22/01
Posts: 547
Loc: 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"
Top
#52674 - 06/02/05 10:56 PM Re: #6/2 NM Good for 65 amps?
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: 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
Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals