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Does the "hot" of the desired circuit and the desired water pipe when measured with a volt meter between the two equal 120volts ? Then consider it a ground.


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250.118 is about conductors suitable for grounding equipment - not the equipment [I consider grounding electrodes to be special equipment being purposed to a system, not simple conductors, but who knows what the code guys would say if you put it to them that way]. 250.52 does permit using water pipes, but does not demand it. What is demanded? Any one of ...


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