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Old 02-13-2008, 03:49 PM   #16
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supplemental ground to water pipe and gas


Thanks guys, this gives me some options and decisions to be made. Incidentally the question asked by JV may apply to me also: I replaced the metal pipe with CPVC only as far as the walls. It's still galvy after that (except for the kitchen sink where I was able to get CPVC all the way under the sink). So there are now two separate sets of metal pipe plumbing completely isolated (by CPVC) from the main water service pipe coming in from the meter. Following the spirit of the NEC (and maybe also the letter) it seems those should also be bonded to the ground system. Correct? PITA but certainly doable. So what about the metal kitchen sink? At what point do you stop bonding all the metal in the house to the ground system?

I think it's a 200 A amp entrance but neither the water pipe bonding wire (stranded) nor the electrode grounding wire (solid - the one to the ground rods) is #2. The service entrance wires are Al of course so much larger but I'll check their size, the service amps, and the size of both bare wires tonight.

On the rest, I want to go back tonight and read more in 250 to make sure I understand but, stubbie, your point (if I understood it right) that I can drive a new ground rod and use that in part (yes, with two clamps) as a way to splice in a new section of wire is an interesting option that I wasn't aware of.

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Old 02-13-2008, 04:36 PM   #17
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supplemental ground to water pipe and gas


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Originally Posted by philS View Post
I that I can drive a new ground rod and use that in part (yes, with two clamps) as a way to splice in a new section of wire is an interesting option that I wasn't aware of.
Don't forget, if you drive a second ground rod, that has to be bonded to the first. (Via existing #6 gauge conductors of the electrical system ground if convenient.)

Last edited by AllanJ; 02-13-2008 at 04:47 PM.
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Old 02-13-2008, 08:01 PM   #18
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supplemental ground to water pipe and gas


Phil

A #4 solid copper conductor will cover everything up to 2/0 or 3/0 copper and 4/0 to 250 kcmil aluminum. I'm having an issue with that image in that it shows 4/0 service entrance but it doesn't say whether copper or al but 200 amp service is a 4/0 aluminum conductor which makes the water pipe bond #2 aluminum as shown. So I am assuming that #2 is aluminum but they show it connected to rebar and in contact with the cement if not encased in it. Aluminum is not allowed to be terminated in contact with masonery. At any rate #4 copper is usually the way to go for any residential service up to 200 amps.
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Old 02-13-2008, 08:28 PM   #19
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supplemental ground to water pipe and gas


I don't think you are required to bond back to the other existing supplemental electrode(s). As long as the electrode system bonds back to the grounded conductor of the service equipment.

Another way you can go is with a grounding electrode conductor bus bar. You could simply connect your existing water pipe bond wire to it then connect your extension to it and run it to the water pipe.

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