ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
VFD MotorFeeders
by gfretwell. 10/19/17 01:02 AM
Generator Cable Sizing
by brsele. 10/18/17 07:39 PM
What do you do?
by gfretwell. 10/17/17 01:08 AM
Good ol' copper pipe in the fuse holder trick
by HotLine1. 10/16/17 07:16 PM
Another generator question
by HotLine1. 10/16/17 07:02 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
241,395 Are you busy
177,352 Re: Forum
168,962 Need opinion
Who's Online Now
0 registered members (), 52 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#184402 - 02/09/09 06:10 PM NM Protection - Exposed Work  
InspectorE  Offline
Member
Joined: Oct 2004
Posts: 51
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?


2017 / 2014 NEC & Related Books and Study Guides

#184403 - 02/09/09 06:11 PM Re: NM Protection - Exposed Work [Re: InspectorE]  
InspectorE  Offline
Member
Joined: Oct 2004
Posts: 51
Hudson WI USA
That should be 334.15(b), not 16..typo


#184405 - 02/09/09 06:43 PM Re: NM Protection - Exposed Work [Re: InspectorE]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,123
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

#184409 - 02/09/09 08:07 PM Re: NM Protection - Exposed Work [Re: gfretwell]  
LK  Offline
Member
Joined: Jan 2003
Posts: 1,429
New Jersey
Yup, it's all spelled out in the code.



Member Spotlight
MarkC10
MarkC10
CA, Inland Empire
Posts: 43
Joined: September 2013
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.016s Queries: 15 (0.003s) Memory: 0.7594 MB (Peak: 0.8935 MB) Zlib enabled. Server Time: 2017-10-19 16:09:51 UTC