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Length of free conductors at outlets #210475 06/26/13 12:05 PM
Joined: Feb 2001
Posts: 308
S
Steve T Offline OP
Member
Does anyone happen to know when the code started requiring a certain length of wire at j-boxes? I'm dealing with existing cloth bx and changing fixtures/devices and trying to apply a practical approach.

2017 / 2014 NEC & Related Books and Study Guides
Re: Length of free conductors at outlets [Re: Steve T] #210476 06/26/13 02:08 PM
Joined: Apr 2002
Posts: 7,229
HotLine1 Offline
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Oldest NEC I have in the office is 1975.
300.14 is in there with 6"

Someone else here has older NECs in their archives & they may have some input.



John
Re: Length of free conductors at outlets [Re: Steve T] #210477 06/26/13 02:11 PM
Joined: Jul 2004
Posts: 9,559
G
gfretwell Online Content
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In old work, from a practical sense, it is what it is.
Talk to your AHJ to see what remediation they like there.
Typically you can splice on the additional conductor necessary to make the box usable but that is not defined in the code.


Greg Fretwell
Re: Length of free conductors at outlets [Re: Steve T] #210478 06/26/13 02:37 PM
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Posts: 7,229
HotLine1 Offline
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Ditto to what Greg said above as to splicing on extension pieces.

An issue that pops up with replacement fixtures is the temp rating of the 'old' conductors. There is an available sleeve that goes over single conductors that is acceptable to some AHJs.



John
Re: Length of free conductors at outlets [Re: Steve T] #210479 06/26/13 04:06 PM
Joined: Feb 2001
Posts: 308
S
Steve T Offline OP
Member
In this case I am the AHJ. And yes the temp rating is a highly correlated concern. Any links to those sleeves?

Re: Length of free conductors at outlets [Re: Steve T] #210480 06/26/13 04:30 PM
Joined: Apr 2002
Posts: 7,229
HotLine1 Offline
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I do not have a link; hopefully someone does. The sleeves come with a few different fixtures that I have seen.

One that sticks to memory is Ruud Lighting, with the wallpack HID fixtures. You may find it thru McMaster Carr.



John
Re: Length of free conductors at outlets [Re: Steve T] #210481 06/26/13 07:38 PM
Joined: Mar 2004
Posts: 251
W
WESTUPLACE Offline
Member
http://www.3m.com/market/industrial/ceramics/materials/braided_sleevings.html

I use this in the industrial dryers I work on. Most well stocked electronic stores carry it as well as some HVAC suppy stores

Re: Length of free conductors at outlets [Re: Steve T] #210482 06/26/13 09:55 PM
Joined: Apr 2002
Posts: 7,229
HotLine1 Offline
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West:
Thanks for that link. Based on the temp ratings...it looks $$$$


John
Re: Length of free conductors at outlets [Re: Steve T] #210483 06/27/13 01:25 AM
Joined: Mar 2004
Posts: 776
B
BigB Offline
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Not to change directions here but are you allowing grounding type receptacles? I have often wondered about this, as the BX provides a grounding path, although questionable and not actually listed for grounding. What do you do?

Re: Length of free conductors at outlets [Re: Steve T] #210484 06/28/13 09:38 AM
Joined: Apr 2002
Posts: 7,229
HotLine1 Offline
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BigB:
Best answer I can offer is:
"320.108 Equipment Grounding Conductor. Type AC cable
shall provide an adequate path for fault current as required
by 250.4(A)(5) or (B)(4) to act as an equipment grounding
conductor."
From the '11 NEC



John
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