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Joined: Apr 2001
Posts: 84
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Does any one splice or tap to the GEC? What do you use? I'm upgrading a duplex with 100 amp panels side by side in the basement. Rather than run two #6 solid cu from each panel to the ground rods outside, I'd like to run from one panel to the rods. Then run #6 from the 2'nd panel and tap onto the 1'st panel's GEC using irreversible compression-type connectors. I believe this is permitted by NEC 250.64 (C) and (D). I've checked with 2 supply houses and they evidently do not carry a compression tool or the connectors. Anyone have experience with this?
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Joined: May 2001
Posts: 717
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Donles, Burndy, Thomas & Betts, and Anderson are the ones that make the tools and materials off the top of my head. All of these can be found by a simple web search. If you quit that solid habit, you can use a Cadweld, made by erico www.erico.com These are reusable for a long time, and do not degrade like crimps or split bolts.
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Joined: Apr 2001
Posts: 84
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What is the ballpark cost for Cadweld?
I've found the cost of the T&B tools to be prohibitive for my infrequent use. Although I did see a Penn-Union tool on ebay for what is probably alot less than retail. Minimum bid $99 for a TDM-250 and the auction was winding down.
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Joined: Jan 2002
Posts: 1,457
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I normally use a split bolt for this.
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Joined: Aug 2003
Posts: 1,374
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Split bolts are not irreversible. Perhaps you're thinking of an equipment grounding conductor and not a grounding electrode conductor?
Ryan Jackson, Salt Lake City
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Joined: Jan 2003
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If you do a search on this site for cad welds you will find a thread that talks about one shot disposable cad welds for $5.00 I have not used them but it sounds like a great deal.
Bob Badger Construction & Maintenance Electrician Massachusetts
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Joined: Apr 2001
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I looked at Erico's site for the one-shot, inexpensive cadweld splices. Their site isn't the most user friendly. I did come across mold # PG11L for #4 solid to #4 solid taps but no details. I'll have to call suppliers tomorrow. Thanks.
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Joined: Aug 2003
Posts: 64
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Ryan,
Couldn't 250.64(D) be used here, and wouldn't that allow the use of something like a split bolt to make a tap to a second enclosure as long as the GEC to the first enclosure meets 250.64(C) and is not spliced where the tap joins?
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Joined: Aug 2003
Posts: 1,374
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EPRICE: Thanks! I got so caught up the topic starter's question of how to do it irreversibly that I didn't look at the code. Good catch.
Scott: Sorry!
Ryan Jackson, Salt Lake City
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Joined: Apr 2001
Posts: 84
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Care to expand on that a little? Meanwhile, I'll consult the code.
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Posts: 61
Joined: August 2007
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