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: Non-Members: Did you know?
by Admin
Today at 02:34 PM
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), 83 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#184402 - 02/09/09 02:10 PM NM Protection - Exposed Work
InspectorE Offline
Member
Registered: 10/08/04
Posts: 51
Loc: Hudson WI USA
Section 334.16(b)requires that NM used in exposed areas be protected with conduit or other approved means. Does the code indicate minimum diameters for various NM sizes similar to the conduit fill tables? Or is the amount of space taken up by the NM irrelevant with respect to conduit diameter? If so is it left to the installer's judgement?
Top
2017 / 2014 NEC & Related Books and Study Guides
#184403 - 02/09/09 02:11 PM Re: NM Protection - Exposed Work [Re: InspectorE]
InspectorE Offline
Member
Registered: 10/08/04
Posts: 51
Loc: Hudson WI USA
That should be 334.15(b), not 16..typo
Top
#184405 - 02/09/09 02:43 PM Re: NM Protection - Exposed Work [Re: InspectorE]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
You use the circular size defined by the widest dimension of the cable. For flat Romex that makes a pretty fat "conductor". A 12-2 is about .4" which puts it between a #2 and a #1 THHN. Generally I will make some concession if this is a single straight run down a wall.
_________________________
Greg Fretwell
Top
#184409 - 02/09/09 04:07 PM Re: NM Protection - Exposed Work [Re: gfretwell]
LK Offline
Member
Registered: 01/21/03
Posts: 1721
Loc: New Jersey
Yup, it's all spelled out in the code.
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