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#80914 06/11/02 08:33 PM
Joined: Nov 2000
Posts: 2,236
Likes: 1
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This was found in a bag of S-C-GS-1's (#10x32 ground screws with 1/4" hex heads)...

[Linked Image from users.stargate.net]
[Linked Image from users.stargate.net]

Doesn't the last sentence in 250.8 prohibit this?

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

[Linked Image]

Floor sweepin's ended up in the wrong box before they got painted??? Got me...


-Virgil
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#80915 06/11/02 09:17 PM
Joined: Apr 2002
Posts: 2,527
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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.]

#80916 06/11/02 11:49 PM
Joined: Oct 2000
Posts: 4,067
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Virgil,

Some difference in resolution there guy!

Much better!

[Linked Image]
Bill


Bill
#80917 06/12/02 12:12 AM
Joined: Nov 2000
Posts: 2,236
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Yep, finally got a macro!

2.1 Mega Pixel...

More pix to come!!!


-Virgil
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5 Star Inspections
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#80918 06/12/02 12:29 AM
Joined: Oct 2000
Posts: 4,067
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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.

[Linked Image]
Bill

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


Bill
#80919 06/12/02 01:18 AM
Joined: Jun 2001
Posts: 141
A
Member
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

#80920 06/13/02 11:31 PM
Joined: Nov 2000
Posts: 2,236
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Sounds like a good theory to me!

Does anyone remember these being sold as grounding screws?


-Virgil
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5 Star Inspections
Member IAEI
#80921 06/14/02 04:40 AM
Joined: Aug 2001
Posts: 7,520
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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?

#80922 06/14/02 07:06 AM
Joined: Oct 2000
Posts: 5,392
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Paul,
i think many were simply using sheet rock screws....

#80923 06/14/02 07:11 AM
Joined: Oct 2000
Posts: 2,749
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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.


Joe Tedesco, NEC Consultant

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