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#13707 - 09/10/02 03:52 AM How much (jacket) is too much?
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
I have seen panel changeouts where the new panel was much taller, but the installer just pulled the NM cable back into the new panel without removing any additional jacket. Sometimes this can mean more than 12" of jacket in the panel. Other than looking bad, I can't think of any reason to complain (not that I need much of a reason to complain, anyway!). I read a book about inspecting residential electrical systems, and there was reference to excessive combustible material (the paper inside the NM?) in the panel in these cases.
Any other thoughts?
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#13708 - 09/10/02 03:59 AM Re: How much (jacket) is too much?
sparky66wv Offline
Member
Registered: 11/17/00
Posts: 2232
Loc: West Virginia
Reminds me of one of my first jobs as an apprentice where I helped my boss pull out about a bushel of excess wire in a sub-panel.

I leave about 2 to 4" of the jacket myself, and use about a 3" piece of jacket to label the circuit on.
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#13709 - 09/10/02 07:26 AM Re: How much (jacket) is too much?
wirewiz Offline
Member
Registered: 01/27/02
Posts: 122
Loc: WA.
When I first got into the trade I was told that you couldn't leave an excessive amount of the outer jacket because the jacket covering the wire in the panel or in conduit could cause the wire to over heat. So to this day I leave about an inch of the jacket.
Wirewiz
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#13710 - 09/10/02 11:55 PM Re: How much (jacket) is too much?
TE Offline
Member
Registered: 08/26/02
Posts: 36
Loc: USA
As I see it this falls under the least enforced NEC violation nationwide, which if enforced would eliminate most of the hacks
you have to try and compete with.

"installed in a neat and workmanlike manner"
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#13711 - 09/11/02 01:58 PM Re: How much (jacket) is too much?
Tom Offline
Member
Registered: 01/01/01
Posts: 1044
Loc: Shinnston, WV USA
I think the reasons that "neat & workmanlike" are rarely enforced is that there is no definition of it and "neat & workmanlike" doesn't belong in the NEC to begin with (no flames please, just explain how a job that is code compliant is unsafe because of neatness, see 90.1(A))

I usually go with about 1/4", for no other reason then that is what the first journeyman I worked for told me.

Tom
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#13712 - 09/11/02 05:04 PM Re: How much (jacket) is too much?
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
i've always aspired to the neat apperance of the panels advertised in the trade mags....
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#13713 - 09/12/02 11:02 AM Re: How much (jacket) is too much?
ThinkGood Offline
Member
Registered: 08/07/02
Posts: 1081
Loc: Milwaukee, WI
NEC sec. 370-17c - Minimum 1/4, maximum 1 inch?
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#13714 - 09/12/02 05:59 PM Re: How much (jacket) is too much?
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
'inch' ? , but we're an 'international' NEC now .....
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#13715 - 09/12/02 06:27 PM Re: How much (jacket) is too much?
sparky66wv Offline
Member
Registered: 11/17/00
Posts: 2232
Loc: West Virginia
My '99s loaned out to a possible future-apprentice...

What is 370-17c in the 2002 NEC?
_________________________
-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
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#13716 - 09/13/02 09:29 AM Re: How much (jacket) is too much?
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Thinkgood,

Thanks, but I must be missing the 1" part. Where did you find it?
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