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intended use of 4" sq. box #75877 03/15/07 09:26 AM
Joined: May 2003
Posts: 74
J
jkraft Offline OP
Member
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 09:40 AM
Joined: Nov 2006
Posts: 348
I
ITO Offline
Member
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 09:54 AM
Joined: Aug 2001
Posts: 457
J
Jim M Offline
Member
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 10:44 AM
Joined: Aug 2002
Posts: 1,691
S
SvenNYC Offline
Member
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 02:43 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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 from appletonelec.com]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: intended use of 4" sq. box #75882 03/15/07 07:43 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
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Re: intended use of 4" sq. box #75883 03/15/07 08:15 PM
Joined: Sep 2005
Posts: 421
togol Offline
Member
what about using Hubbell I-Grips

instead of a box


Tom
Re: intended use of 4" sq. box #75884 03/15/07 09:21 PM
Joined: Dec 2000
Posts: 4,287
electure Offline
Member
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 09:47 PM
Joined: May 2003
Posts: 74
J
jkraft Offline OP
Member
"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 05:17 AM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
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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