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250.70 GEC to electrode connection. #97158
01/26/06 08:11 PM
01/26/06 08:11 PM
e57  Offline OP
Joined: May 2003
Posts: 2,876
We have talked about this before I think....

Connection to Ufer grounds... If you are using CU wire (over #4)as your Concrete Encased Electrode, (Instead of rebar) would a split bolt connecting the GEC to the panel be considered a "Splice" in the GEC according to 250.64(C)?

At what point would a wire Ufer become a GEC?

(It is accessible for 250.68)

Or would it be 250.70, as most other connections to electrodes are?

250.70 Methods of Grounding and Bonding Conductor Connection to Electrodes.
The grounding or bonding conductor shall be connected to the grounding electrode by exothermic welding, listed lugs, listed pressure connectors, listed clamps, or other listed means. Connections depending on solder shall not be used. Ground clamps shall be listed for the materials of the grounding electrode and the grounding electrode conductor and, where used on pipe, rod, or other buried electrodes, shall also be listed for direct soil burial or concrete encasement. Not more than one conductor shall be connected to the grounding electrode by a single clamp or fitting unless the clamp or fitting is listed for multiple conductors. One of the following methods shall be used:
(1) A pipe fitting, pipe plug, or other approved device screwed into a pipe or pipe fitting
(2) A listed bolted clamp of cast bronze or brass, or plain or malleable iron
(3) For indoor telecommunications purposes only, a listed sheet metal strap-type ground clamp having a rigid metal base that seats on the electrode and having a strap of such material and dimensions that it is not likely to stretch during or after installation
(4) An equally substantial approved means

Forgot local code:

250-50. Grounding Electrode System. If available on the premises at each building or structure served, each item (a) through (d) below, and any made electrodes in accordance with Sections 250-52(c) and (d), shall be bonded together to form the grounding electrode system. A concrete- encased electrode as defined by Section 250-50(c) shall be installed at each new building or structure, and for existing buildings or structures when a new or replacement foundation footing with a perimeter length of 20 feet (6.096 m)is installed. The bonding jumper(s) shall be installed in accordance with Sections 250-64(a), (b) and (e), shall be sized in accordance with Section 250-66 and shall be connected in the manner specified in Section 250-70.

So what do you think, Split Bolt behind a 2G ring OK?

[This message has been edited by e57 (edited 01-26-2006).]

Mark Heller
"Well - I oughta....." -Jackie Gleason
2017 / 2014 NEC & Related Books and Study Guides
Re: 250.70 GEC to electrode connection. #97159
01/26/06 11:22 PM
01/26/06 11:22 PM
gfretwell  Offline

Joined: Jul 2004
Posts: 9,338
I think if it looks like a GEC it is a GEC and can't be spliced but your mileage may vary. I can also see the point that it might be the electrode you are splicing to.

Greg Fretwell
Re: 250.70 GEC to electrode connection. #97160
01/26/06 11:44 PM
01/26/06 11:44 PM
gfretwell  Offline

Joined: Jul 2004
Posts: 9,338
I think, if you drove a rod and ran an unspliced #4 to it you could splice this Ufer GEC to the unspliced one, no questions.
Is that cheaper than a cadweld shot?
Maybe you could just sweet talk the POCO guy into crimping one of his fancy irreversible compression connectors in there to splice it.

Greg Fretwell


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