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#75877 - 03/15/07 07:26 AM intended use of 4" sq. box
jkraft Offline
Member

Registered: 05/05/03
Posts: 75
One of my industrial customers recently had an OSHA inspector come through and make a "recommendation" that an installation I did represents an electrical hazard.

For years I've made up buss drop cables hanging from the ceiling with Kellum grips into 4" square boxes with either twist-lock or 120V duplex receptacles for machines.

His opinion is that when plugging into such a box the employees could push in the knock outs and be exposed to an electrical shock. His argument is that the box is not intended for this use.

He can't quote a code that prohibits this, it's just his recommedation.

Anyone ever had this problem?

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#75878 - 03/15/07 07:40 AM Re: intended use of 4" sq. box
ITO Offline
Member

Registered: 11/26/06
Posts: 341
Loc: Texas
Sounds like this guy is making it up as he goes along.
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#75879 - 03/15/07 07:54 AM Re: intended use of 4" sq. box
Jim M Offline
Member

Registered: 08/10/01
Posts: 453
Loc: Chestertown, MD, USA
I think it may have to do more with the UL listing of the 1900. I have heard that the commonly made up 1900 box extension cordsets seen on every construction job are a no-no, besides the fact they typically lack the GFI protection.

How about mounting an FS box on the end of the cable?

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#75880 - 03/15/07 08:44 AM Re: intended use of 4" sq. box
SvenNYC Offline
Member

Registered: 08/19/02
Posts: 1685
Loc: New York City
Didn't we have a big-time discussion about these things years back?

Apparently, the reasoning is that the boxes aren't designed to be banged around, which could loosen the device and also break out the knockoffs.

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#75881 - 03/15/07 12:43 PM Re: intended use of 4" sq. box
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Yeah we all have made boxes like that and I bet we all have seen them missing KOs.

You need a box listed for pendant use, this box will have a threaded hub for the Kellem Grip and will have no other KOs.

Be happy the OSHA guy did not fine the heck out of your customer.

The box will look similar to this one

_________________________
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Construction & Maintenance Electrician
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#75882 - 03/15/07 05:43 PM Re: intended use of 4" sq. box
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA

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#75883 - 03/15/07 06:15 PM Re: intended use of 4" sq. box
togol Offline
Member

Registered: 09/15/05
Posts: 426
Loc: NW In. USA
what about using Hubbell I-Grips

instead of a box
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#75884 - 03/15/07 07:21 PM Re: intended use of 4" sq. box
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Although I hate cord drops, I think that the idea of pushing out the KOs is weak. If that were the case, wouldn't it be a problem with the boxes mounted on the wall as well?
The 4-S boxes are meant to be secured. Any of the other ways the guys have shown here are better.

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#75885 - 03/15/07 07:47 PM Re: intended use of 4" sq. box
jkraft Offline
Member

Registered: 05/05/03
Posts: 75
"Be happy the OSHA guy did not fine the heck out of your customer"

That's just the point, there is no written code prohibiting this.

I changed the boxes to Appleton JIC-B type boxes. Less expensive than twist-lock connectors or Woodhead products

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#75886 - 03/16/07 03:17 AM Re: intended use of 4" sq. box
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
I did think there was some sort of OSHA prohibition on making extention cords and the like with a 4S used on sites for temporary power. Not an NEC thing, but I think they might have something in the OSHA stuff? Anyone seen a wording for it?
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"Well - I oughta....." -Jackie Gleason

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