ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Changing a Bulb
by gfretwell. 07/14/18 03:12 PM
Tray cable?
by gfretwell. 07/11/18 10:18 PM
Eaton Heavy Duty 30A and 60A Safety Switches
by Admin. 07/11/18 09:49 PM
ORTOVOX Recalls Avalanche Transceivers
by Admin. 07/11/18 09:44 PM
Tingle off the water spigot
by gfretwell. 07/08/18 12:58 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 5 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
NM Protection - Exposed Work #184402
02/09/09 06:10 PM
02/09/09 06:10 PM
I
InspectorE  Offline OP
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
Re: NM Protection - Exposed Work [Re: InspectorE] #184403
02/09/09 06:11 PM
02/09/09 06:11 PM
I
InspectorE  Offline OP
Member
Joined: Oct 2004
Posts: 51
Hudson WI USA
That should be 334.15(b), not 16..typo

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

Member
Joined: Jul 2004
Posts: 9,242
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
Re: NM Protection - Exposed Work [Re: gfretwell] #184409
02/09/09 08:07 PM
02/09/09 08:07 PM
L
LK  Offline
Member
Joined: Jan 2003
Posts: 1,429
New Jersey
Yup, it's all spelled out in the code.


Featured:

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

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,145
Joined: May 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 5
Popular Topics(Views)
248,086 Are you busy
185,524 Re: Forum
174,816 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.027s Queries: 15 (0.005s) Memory: 0.9594 MB (Peak: 1.0939 MB) Zlib enabled. Server Time: 2018-07-16 08:42:07 UTC