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

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
230 or 345 kV transmission lines?
by Vlado
Yesterday at 09:33 AM
breaker meltdown
by crselectric
Yesterday at 12:42 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 17
gfretwell 9
sparky 9
sparky66wv 8
Vlado 6
Who's Online
1 registered (gfretwell), 258 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#210475 - 06/26/13 10:05 AM Length of free conductors at outlets
Steve T Offline
Member

Registered: 02/14/01
Posts: 312
Loc: Oak Park, IL, USA
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.

Top
2014 / 2011 NEC & Related Books and Study Guides
#210476 - 06/26/13 12:08 PM Re: Length of free conductors at outlets [Re: Steve T]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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

Top
#210477 - 06/26/13 12:11 PM Re: Length of free conductors at outlets [Re: Steve T]
gfretwell Online   content

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
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

Top
#210478 - 06/26/13 12:37 PM Re: Length of free conductors at outlets [Re: Steve T]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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

Top
#210479 - 06/26/13 02:06 PM Re: Length of free conductors at outlets [Re: Steve T]
Steve T Offline
Member

Registered: 02/14/01
Posts: 312
Loc: Oak Park, IL, USA
In this case I am the AHJ. And yes the temp rating is a highly correlated concern. Any links to those sleeves?

Top
#210480 - 06/26/13 02:30 PM Re: Length of free conductors at outlets [Re: Steve T]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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

Top
#210481 - 06/26/13 05:38 PM Re: Length of free conductors at outlets [Re: Steve T]
WESTUPLACE Offline
Member

Registered: 03/29/04
Posts: 252
Loc: Kingwood, TX USA
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

Top
#210482 - 06/26/13 07:55 PM Re: Length of free conductors at outlets [Re: Steve T]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
West:
Thanks for that link. Based on the temp ratings...it looks $$$$
_________________________
John

Top
#210483 - 06/26/13 11:25 PM Re: Length of free conductors at outlets [Re: Steve T]
BigB Offline
Member

Registered: 03/31/04
Posts: 725
Loc: Tucson, AZ USA
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?

Top
#210484 - 06/28/13 07:38 AM Re: Length of free conductors at outlets [Re: Steve T]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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

Top
Page 1 of 3 1 2 3 >



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