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#80914 - 06/11/02 08:33 PM 250.8  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,232
West Virginia
This was found in a bag of S-C-GS-1's (#10x32 ground screws with 1/4" hex heads)...

[Linked Image]
[Linked Image]

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
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

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#80915 - 06/11/02 09:17 PM Re: 250.8  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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.]


#80916 - 06/11/02 11:49 PM Re: 250.8  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,875
NY, USA
Virgil,

Some difference in resolution there guy!

Much better!

[Linked Image]
Bill


#80917 - 06/12/02 12:12 AM Re: 250.8  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,232
West Virginia
Yep, finally got a macro!

2.1 Mega Pixel...

More pix to come!!!


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

#80918 - 06/12/02 12:29 AM Re: 250.8  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,875
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.

[Linked Image]
Bill

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


#80919 - 06/12/02 01:18 AM Re: 250.8  
amp-man  Offline
Member
Joined: Jun 2001
Posts: 141
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


#80920 - 06/13/02 11:31 PM Re: 250.8  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,232
West Virginia
Sounds like a good theory to me!

Does anyone remember these being sold as grounding screws?


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

#80921 - 06/14/02 04:40 AM Re: 250.8  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
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?


#80922 - 06/14/02 07:06 AM Re: 250.8  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
Paul,
i think many were simply using sheet rock screws....


#80923 - 06/14/02 07:11 AM Re: 250.8  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
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.


Joe Tedesco, NEC Consultant


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