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Steelhead 02-04-2009 10:47 PM

Grounding Method
 
Hey guys,

I've come across some metal 4x4 boxes that were fastened to concrete or steel. These boxes weren't grounded so I wanted to attach a grounding pigtail using the tapped hole in the back of the box. If I install the grounding screw it hits the concrete or steel almost immediately and the wire is not tight to the box.

What do you guys do when you come across this?

These are some of the things I've done:

1. Mark the hole and remove the box and drill a hole for the grounding screw to fit into then reinstall box
2. Install a different box (one with the raised threaded hole)
3. Use grounding clip that attaches to the front edge of the box

Sometimes these things are easier to do than at other times depending on the conduit/box layout.

Is it acceptable to shorten the grounding screw with the screw cutting function of my wire strippers then install the grounding pigtail?

rgsgww 02-04-2009 10:50 PM

Grounding clip. Works great. Its the green thing in my last thread.

Not sure about the screw, Im sure it wouldn't hurt anything, but it does void the ul rating.

jbfan 02-04-2009 10:59 PM

I cut the screw flush with the box.

Termite 02-05-2009 09:03 AM

Grounding clip.

Gigs 02-05-2009 11:06 AM

Quote:

Originally Posted by rgsgww (Post 225350)
Not sure about the screw, Im sure it wouldn't hurt anything, but it does void the ul rating.

There are no such thing as UL listed ground screws. We went through this in another thread.

J. V. 02-05-2009 11:12 AM

Washers?

rgsgww 02-05-2009 12:06 PM

Quote:

Originally Posted by Gigs (Post 225531)
There are no such thing as UL listed ground screws. We went through this in another thread.


Come to think of it, there is no rating.


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