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Topic:   Acceptable Connection? - 611 visits (2 today, 3 this week)

Michael Thomas
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From:Evanston, IL
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posted March 25, 2007 11:33 AM            

Connection at slotted hole intended to mount panel. Acceptable?

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[This message has been edited by Michael Thomas (edited March 25, 2007).]

John Arnold
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posted March 25, 2007 11:52 AM            

If that is supposed to be the panel bond, I vote no, because the screw is likely not making good contact with the enclosure.

Tim Moreira
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posted March 25, 2007 12:22 PM            

I say no. That is not the approved bonding bar/clamp for the panel bond.

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Tim Moreira
Suncoast Home Inspections
Suncoasthomeinspections@yahoo.com

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John Arnold
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posted March 25, 2007 12:39 PM            

Tim is righter than I am. Even if the screw is making good contact it wouldn't be right because that ain't what the slotted hole is there for.

Tim Moreira
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posted March 25, 2007 12:49 PM            

That's kinda like the metal boxes that have all those little holes all over them that are used to mount the box, and then there's that one little raised threaded hole which is for the attachment of that little green screw.

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Tim Moreira
Suncoast Home Inspections
Suncoasthomeinspections@yahoo.com

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Michael Thomas
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posted March 25, 2007 01:21 PM            

Thanks.

No two of those panels are bonded to the same point internally, BTW.

[This message has been edited by Michael Thomas (edited March 25, 2007).]

Jerry Peck
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posted March 25, 2007 02:28 PM            

No, it is not.

See the way that is recessed back toward the wall? The ones made for grounding and bonding terminals are bumped out from the back to the inside of the panel.

They are made to accept short threaded screws which, when all the way, are still not long enough to touch the wall - that's the reason for the hump they are in. The feet go back 1/4", the hump for the ground terminal bars come in 1/4", that leaves room for a 1/2" long screw (of the proper type too).

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Jerry Peck
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(i.e., Daytona Beach area)

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John Steinke
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posted March 26, 2007 05:12 PM            

Sure looks like a sheet metal screw, possibly going into the framing.

The use of sheet metal screws for this purpose is specifically not allowed by the NEC.

dick whitfield
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posted March 26, 2007 05:24 PM         

In my area....grouding connections to any piece of sheet metal has to be either a tapped hole or a nut and bolt connection.