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#214327 - 11/16/14 10:45 AM NM Cable entering boxes.
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
The question came to me about how far must the NM cable sheath enter the boxes? I could only find the information located in 334.15(C). Nothing about entering the box sans the conduit. My answer would be, the sheath must extend beyond the clamping device be it a non-metallic box or a metal one. The person calling me was concerned because his boss wants the sheath to be at least 3/4" into the box.
There's got to be more important things than this dispute.
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2014 / 2011 NEC & Related Books and Study Guides
#214329 - 11/16/14 04:32 PM Re: NM Cable entering boxes. [Re: George Little]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
George:
From 314.17 (C) of 2014 NEC.....

Where nonmetallic sheathed cable or multi-conductor Type UF cable is used, the sheath shall extend not less than 6 mm (1/4 in.) inside the box and beyond any cable clamp. In all instances, all permitted wiring methods shall be secured to the boxes.



Edited by HotLine1 (11/17/14 07:04 AM)
Edit Reason: Corrected copy booboo
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#214331 - 11/16/14 11:44 PM Re: NM Cable entering boxes. [Re: George Little]
gfretwell Offline

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Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
1/4" in english
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#214333 - 11/17/14 01:10 PM Re: NM Cable entering boxes. [Re: George Little]
ghost307 Offline
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Registered: 05/09/05
Posts: 884
Loc: Chicago Illinois USA
Yep, 1/4" minimum.
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#214335 - 11/17/14 03:45 PM Re: NM Cable entering boxes. [Re: George Little]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Thanks Guys. You are the best. I would have expected it to be in Article 334 but it wasn't. HEY Inspectors have every right to be wrong :)) And I'm probably one of the few that would admit it.

That's what this BB is all about.
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George Little

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#214336 - 11/17/14 06:50 PM Re: NM Cable entering boxes. [Re: George Little]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
George:
As I say to some..."I'm human, I do make mistakes too"
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#214339 - 11/17/14 08:20 PM Re: NM Cable entering boxes. [Re: George Little]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I guess it is because there is more than one kind of cable and they were trying to avoid the mess that was created when they put a cable rule in 320 and referred to it in all the other cable articles. (like accessible attics in 330.23 334.23 etc)
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