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#93239 - 05/09/05 06:56 PM What is it?
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
Can someone look at the text at 250.70(1) and tell me or better yet post a picture of what the code is talking about here?
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George Little
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#93240 - 05/09/05 07:28 PM Re: What is it?
Fred Offline
Member
Registered: 04/30/01
Posts: 449
Loc: Straughn, IN 47387
George, I wish I had saved one of these just for a conversation piece. On a lot of 1930-1940 era services around here they grounded the meterbase and ran a piece of 1/2" rigid down to the ground to protect the bare #6. On the bottom end of the 1/2" rigid was a yoke that threaded on to the pipe and had a flat clamp with a 5/16" bolt through it to sandwich the GEC as it exited the pipe. Never have been able to take one apart. They were always grown into one piece from corrosion where they were in contact with the soil. I've pitched dozens. I think Blackburn still makes these.
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#93241 - 05/10/05 07:22 AM Re: What is it?
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
George, we still use these (we call them City Hubs) on a regular basis. Below you will find a picture of one.




Below is a recent job where we are using them for the GEC's of SDS's on a hospital project. It's not a very good picture though and they are floating.



Roger
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#93242 - 05/10/05 08:37 AM Re: What is it?
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
I think the operative part of the question/answer is you can use the same hub to make a <pipe> electrode connection that you use to bond the far end of the GEC raceway. I am sure we have all seen those connectors.
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#93243 - 05/10/05 10:09 AM Re: What is it?
Ryan_J Offline
Moderator
Registered: 08/19/03
Posts: 1374
Loc: West Jordan, Utah, USA
Roger: Thats a great picture...do you mind if I use it in some of my classes?

Also, it is intersting to note that the busbar termination wasn't really permitted until 2005
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Ryan Jackson,
Salt Lake City
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#93244 - 05/10/05 11:04 AM Re: What is it?
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
Yes Roger I agree with Ryan -That's an excllent picture. I know what they now are and they are still in use today. Thanks.
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George Little
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#93245 - 05/10/05 11:43 AM Re: What is it?
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
Ryan

Quote:
it is intersting to note that the busbar termination wasn't really permitted until 2005


That only applies to service GECs, take a look at 2002 250.30(A)(3)(b).

Bob
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#93246 - 05/10/05 11:43 AM Re: What is it?
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
George, you're welcome.

Ryan, you are more than welcome to use the picture. I'll post a few more from this room in the pictures forum later.

Roger
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#93247 - 05/10/05 02:38 PM Re: What is it?
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA
See the 1999 NEC Section 250-64(C)

Exception: Busbars shall be permitted to have splices.
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Joe Tedesco, NEC Consultant
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#93248 - 05/10/05 03:44 PM Re: What is it?
Ryan_J Offline
Moderator
Registered: 08/19/03
Posts: 1374
Loc: West Jordan, Utah, USA
Thanks Bob.
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Ryan Jackson,
Salt Lake City
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