ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 25 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Opinion needed #12926
08/21/02 06:11 PM
08/21/02 06:11 PM
J
Jim M  Offline OP
Member
Joined: Aug 2001
Posts: 457
Chestertown, MD, USA
This was posted on a DIY site. I don't see how Article 312 would apply to a sleeve for NM-B running to a surface mounted device ie switch or receptacle. Your thoughts?

We commonly 'sleeve' romex NM-B cable from a suface mounted wall box ...and it extends up into a joist space...and does not penetrate any of the structure.This saves us from installing a splice box up there!

The conduit is generally a straight piece and extends up into the joist space,and MUST have a protective bushing on that far end.

A complete conduit system is defined as one with enclosures etc at each end.

A 24" short nipple between two enclosures ,and no longer than 24" is permotted to be filled at 60% of its area...as it is apart of a complete system.
This would require a trade size conduit of no less than 3/4" for a 12-2G NM-B cable.


Your installation is not a complete system...and the 1/2" conduit is fine,[I prefer 3/4" for this ] if between 18" and not longer than 10ft..and if it is also secured at the far end...if the NM-B was installed without trauma...a bushing is installed and the opening sealed as per 312-5.c.d...and the cable is stapled within 12" of the exit point in that joist space...

I have always used a bushing and properly secured the cable, but don't see the purpose of the raceway seal. I don't know how the moderator thinks that this Article would apply as this is not entering a cabinet, cutout or meter socket.

Work Gear for Electricians and the Trades
Re: Opinion needed #12927
08/21/02 07:35 PM
08/21/02 07:35 PM
E
ElectricAL  Offline
Member
Joined: Oct 2001
Posts: 597
Minneapolis, MN USA
I agree with you, Jim. Seems to me that 300.4 is the appropriate reference.

Al


Al Hildenbrand

Featured:

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

 

Member Spotlight
TOOL_5150
TOOL_5150
Bay Area
Posts: 61
Joined: August 2007
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 18
Potseal 13
Popular Topics(Views)
243,542 Are you busy
180,344 Re: Forum
170,832 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.013s Queries: 14 (0.004s) Memory: 0.9414 MB (Peak: 1.0572 MB) Zlib enabled. Server Time: 2018-01-19 01:39:49 UTC