ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
How's Florida doing with Hurricane Ian?
by Bill Addiss - 09/28/22 12:41 PM
Tough being a lineman's kid
by Bill Addiss - 09/28/22 12:39 PM
GFCI's pops in large numbers
by dsk - 09/26/22 04:35 AM
AFCI’s Revisited
by sparky - 09/24/22 09:58 AM
NFPA Price Increase Coming
by Bill Addiss - 09/23/22 02:22 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 48 guests, and 12 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#12926 08/21/02 07:11 PM
Joined: Aug 2001
Posts: 464
Likes: 1
J
Jim M Offline OP
Member
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.

#12927 08/21/02 08:35 PM
Joined: Oct 2001
Posts: 597
E
Member
I agree with you, Jim. Seems to me that 300.4 is the appropriate reference.

Al


Al Hildenbrand

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Radar
Radar
Los Angeles
Posts: 349
Joined: April 2004
Top Posters(30 Days)
dsk 3
Popular Topics(Views)
297,738 Are you busy
228,504 Re: Forum
213,335 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5