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

   
Topic Options
Rate This Topic
#12926 - 08/21/02 04:11 PM Opinion needed
Jim M Offline
Member
Registered: 08/10/01
Posts: 453
Loc: 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.
Top
Work Gear for Electricians and the Trades
#12927 - 08/21/02 05:35 PM Re: Opinion needed
ElectricAL Offline
Member
Registered: 10/10/01
Posts: 615
Loc: Minneapolis, MN USA
I agree with you, Jim. Seems to me that 300.4 is the appropriate reference.

Al
_________________________
Al Hildenbrand
Top

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Recent Posts
Forum Styles
by Admin
Today at 02:08 AM
License exam
by TRUE POWER
Yesterday at 09:16 PM
Looking for older post
by sparkyinak
Yesterday at 12:27 AM
Members: Non-Members: Did you know?
by Admin
01/22/17 02:34 PM
Safety at heights?
by HotLine1
01/21/17 08:51 PM

Who's Online
0 registered (), 84 Guests and 15 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
Desk-mounted "power-board"
Top Posters
gfretwell 9066
Trumpy 8560
pauluk 7693
HotLine1 6833
sparky 5545
Member Spotlight
Member Since: 11/11/05
Posts: 190

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