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#93239 05/09/05 09:56 PM
Joined: Jan 2004
Posts: 1,507
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Member
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?


George Little
2017 / 2014 NEC & Related Books and Study Guides
#93240 05/09/05 10:28 PM
Joined: Apr 2001
Posts: 449
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Member
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.

#93241 05/10/05 10:22 AM
Joined: May 2002
Posts: 1,716
R
Member
George, we still use these (we call them City Hubs) on a regular basis. Below you will find a picture of one.


[Linked Image from elec-cat.tnb.com]

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.

[Linked Image]

Roger

#93242 05/10/05 11:37 AM
Joined: Jul 2004
Posts: 9,644
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Member
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.


Greg Fretwell
#93243 05/10/05 01:09 PM
Joined: Aug 2003
Posts: 1,374
R
Moderator
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 [Linked Image]


Ryan Jackson,
Salt Lake City
#93244 05/10/05 02:04 PM
Joined: Jan 2004
Posts: 1,507
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Member
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.


George Little
#93245 05/10/05 02:43 PM
Joined: Jan 2003
Posts: 4,391
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Moderator
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). [Linked Image]

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#93246 05/10/05 02:43 PM
Joined: May 2002
Posts: 1,716
R
Member
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

#93247 05/10/05 05:38 PM
Joined: Oct 2000
Posts: 2,749
Member
See the 1999 NEC Section 250-64(C)

Exception: Busbars shall be permitted to have splices.


Joe Tedesco, NEC Consultant
#93248 05/10/05 06:44 PM
Joined: Aug 2003
Posts: 1,374
R
Moderator
Thanks Bob.


Ryan Jackson,
Salt Lake City
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