On 10/11/2014 2:46 PM, John G wrote:
On Saturday, October 11, 2014 2:21:45 PM UTC-4, N8N wrote:
*Actually the 2014 code does still permit the connection to the waterpipe. Article 250.130(C)(1) states that is is permitted "At any accessible point on the grounding electrode system as described in 250.50". The waterpipe is part of the grounding electrode system. The water meter and water heater bonding jumpers would have to be in place and the clamp would need to be approved for the type of metal piping.







That is what I think happened in your case. The disimilar metals of the ground clamp (Brass) attached to a steel pipe acted as a battery. Just like a water heater. The clamp should not have been buried in a finished ceiling. The ground wire should have been run over to the water meter location where it would have been accessible and could have been clamped to the water pipe or the grounding electrode conductor.



My understanding is that the water pipe is NOT considered part of the grounding electrode system, only something that needs to be bonded *to* the grounding electrode system, so relying on a metal pipe for a ground for a previously ungrounded receptacle is no longer allowed, as others have already stated.



nate

*Go back to your code book Nate and read the sections that I posted.


320:1 is a heck of a quoted text ratio. I'm
guessing that would burn up Danny's chain saw.

Sure does, mine.

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