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#80914 - 06/11/02 05:33 PM 250.8
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
This was found in a bag of S-C-GS-1's (#10x32 ground screws with 1/4" hex heads)...




Doesn't the last sentence in 250.8 prohibit this?

"...Sheet metal screws shall not be used to connect grounding conductors to enclosures."



Floor sweepin's ended up in the wrong box before they got painted??? Got me...
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Residential/Commercial Inspector
5 Star Inspections
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#80915 - 06/11/02 06:17 PM Re: 250.8
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Musta' been "product waste-reduction week" on the miscellaneous green-dyed screw bulk packaging asssitant inspection team.

An email might get a case of good ones on your doorstep. [Yeah, just what you wanted...exchange it for the cheese wheel.]

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#80916 - 06/11/02 08:49 PM Re: 250.8
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Virgil,

Some difference in resolution there guy!

Much better!


Bill

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#80917 - 06/11/02 09:12 PM Re: 250.8
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Yep, finally got a macro!

2.1 Mega Pixel...

More pix to come!!!
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Residential/Commercial Inspector
5 Star Inspections
Member IAEI

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#80918 - 06/11/02 09:29 PM Re: 250.8
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Virgil,

Hmm, I double-posted somehow ...
2.1 is good, I got a new one recently too, a 2.3 I think (Ricoh) still haven't had the time to investigate all the features.


Bill

[This message has been edited by Bill Addiss (edited 06-12-2002).]

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#80919 - 06/11/02 10:18 PM Re: 250.8
amp-man Offline
Member

Registered: 06/23/01
Posts: 144
Loc: Sacto, California US of A
I'm thinking that this is a relic from the past...it was only a few cycles ago that sheet metal screws were prohibited.

Like the occasional letter from 50 years ago that gets delivered with today's mail, could this screw have been trapped in a bin for 10 years, and just fallen loose?

Cliff

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#80920 - 06/13/02 08:31 PM Re: 250.8
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Sounds like a good theory to me!

Does anyone remember these being sold as grounding screws?
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Residential/Commercial Inspector
5 Star Inspections
Member IAEI

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#80921 - 06/14/02 01:40 AM Re: 250.8
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Why were sheet-metal screws removed as an acceptable method of grounding?

Lack of contact area to metal to clear a high-current fault? Possibility of working loose?

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#80922 - 06/14/02 04:06 AM Re: 250.8
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
Paul,
i think many were simply using sheet rock screws....

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#80923 - 06/14/02 04:11 AM Re: 250.8
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Yes, the proposal was sent in by an electrical inspector in Madison, Wisconsin and his substantiation indicated that sheet metal screws were unreliable when used to secure an equipment grounding conductor to the enclosure. The code uses the term "means provided" in many areas, when the rule covers the termination of the EGC. This "means provided" is usually a threaded hole, or other termination where "GR" or "GRND" will be engraved in the metal.
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