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Joined: Feb 2001
Posts: 308
S
Steve T Offline OP
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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.

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Joined: Apr 2002
Posts: 7,386
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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
Joined: Jul 2004
Posts: 9,942
Likes: 34
G
Member
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
Joined: Apr 2002
Posts: 7,386
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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
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?

Joined: Apr 2002
Posts: 7,386
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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
Joined: Mar 2004
Posts: 251
W
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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

Joined: Apr 2002
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West:
Thanks for that link. Based on the temp ratings...it looks $$$$


John
Joined: Mar 2004
Posts: 814
B
Member
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?

Joined: Apr 2002
Posts: 7,386
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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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