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#214252 - 11/03/14 07:59 PM Support of multigang boxes
BigB Offline
Member
Registered: 03/31/04
Posts: 719
Loc: Tucson, AZ USA
We have been using a lot of the Arlington Industries "One" box, which is listed for both old & new work. The 4 gang ones do not have a bracket for additional support like most 4 gang boxes do. Our inspector's here will fail for no additional support on 4 gang and up, but I cannot find a code reference. I believe multi gang boxes manufactured with additional brackets are required to be secured with those brackets but I do not believe a listed box manufactured with no additional bracket is required to be supported at both ends, and to do so would violate 314.23(1). I think they have been enforcing the manufacturer's requirement to use the provided additional supports for so long it has grown into "all four gangs to be supported" in their minds. Am I correct or did I miss something in the NEC? (We do not have any local amendments so it can't
be that)
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#214254 - 11/03/14 10:19 PM Re: Support of multigang boxes [Re: BigB]
Tesla Offline
Member
Registered: 06/16/04
Posts: 1273
Loc: Sacramento, CA
Contact Arlington -- customer service -- to see if they've got UL/CSA literature that backs your contention.

Your best shot at winning the AHJ over comes from authority.

This is especially true when the issue turns on a specific product.

A four-gang box is pretty uncommon in residential. With any kind of wiring discretion, my impulse is to design away from such a box.

Obviously, any support scheme is sure to compromise Arlington's depth adjustment scheme.

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Tesla
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#214255 - 11/03/14 10:40 PM Re: Support of multigang boxes [Re: BigB]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9038
Loc: Estero,Fl,usa
I think the rub comes in the first line of 314.23(B)
"shall be rigidly and securely fastened in place."

If the far end is not secure and rigid, you need better bracing.

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Greg Fretwell
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#214264 - 11/04/14 05:45 PM Re: Support of multigang boxes [Re: BigB]
HotLine1 Offline


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
I just looked around the Arlington site, and see no info.

I have to go with Greg....far end moves, it needs bracing.

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John
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#214269 - 11/04/14 07:23 PM Re: Support of multigang boxes [Re: BigB]
BigB Offline
Member
Registered: 03/31/04
Posts: 719
Loc: Tucson, AZ USA
On there specifications page it says "super secure" and "no wobble". Since they are flat against the stud they do not move, and are rigid and secure. I would think this meets the requirements of 314.23(B). We emailed Arlington and are waiting for a reply. I guess I am having trouble understanding why a listed product cannot be installed per the instructions. It is still my belief that the inspectors have been seeing them with the extra brace for so long they assume that the extra brace is required.






Edited by BigB (11/04/14 07:25 PM)
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#214272 - 11/05/14 12:08 PM Re: Support of multigang boxes [Re: BigB]
HotLine1 Offline


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
I saw what you posted, but I don't see any reference to the 4 gang.

If you mount it and it's solid, I would have no issue.
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John
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