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intended use of 4" sq. box #75877
03/15/07 10:26 AM
03/15/07 10:26 AM
jkraft  Offline OP
Joined: May 2003
Posts: 74
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?

Work Gear for Electricians and the Trades
Re: intended use of 4" sq. box #75878
03/15/07 10:40 AM
03/15/07 10:40 AM
ITO  Offline
Joined: Nov 2006
Posts: 348
Sounds like this guy is making it up as he goes along.

101° Rx = + /_\
Re: intended use of 4" sq. box #75879
03/15/07 10:54 AM
03/15/07 10:54 AM
Jim M  Offline
Joined: Aug 2001
Posts: 457
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?

Re: intended use of 4" sq. box #75880
03/15/07 11:44 AM
03/15/07 11:44 AM
SvenNYC  Offline
Joined: Aug 2002
Posts: 1,691
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.

Re: intended use of 4" sq. box #75881
03/15/07 03:43 PM
03/15/07 03:43 PM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
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

[Linked Image]

Bob Badger
Construction & Maintenance Electrician
Re: intended use of 4" sq. box #75882
03/15/07 08:43 PM
03/15/07 08:43 PM
Redsy  Offline
Joined: Mar 2001
Posts: 2,056
Bucks County PA

Re: intended use of 4" sq. box #75883
03/15/07 09:15 PM
03/15/07 09:15 PM
togol  Offline
Joined: Sep 2005
Posts: 421
what about using Hubbell I-Grips

instead of a box

Re: intended use of 4" sq. box #75884
03/15/07 10:21 PM
03/15/07 10:21 PM
electure  Offline

Joined: Dec 2000
Posts: 4,280
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.

Re: intended use of 4" sq. box #75885
03/15/07 10:47 PM
03/15/07 10:47 PM
jkraft  Offline OP
Joined: May 2003
Posts: 74
"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

Re: intended use of 4" sq. box #75886
03/16/07 06:17 AM
03/16/07 06:17 AM
e57  Offline
Joined: May 2003
Posts: 2,876
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?

Mark Heller
"Well - I oughta....." -Jackie Gleason
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