Bonding a gas hot water heater

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Smash

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This subject I'm sure has been exhausted however here I am again. City of Phila
house being sold punch list from home inspector requires the bonding jumper from cold to hot to gas pipe. Newer home I'm not making waves but a older home with some ground issues like knob & tube wiring I'm not doing it. Don't need his circuits looking for ground at the gas service. It is not a requirement of the NEC that I can find however some states like NJ (imagine that) and I believe Canada require it. I've heard it's required sometimes when combinations metals are involved within the gas service. Why would some require it and NEC not ? My head hurts reading yes and no on this subject so I came here can we put this thing to bed and try not to blow anything up as some random radon motor searches for his lost neutral finds ground at the gas line & boom have seen it happen. That case a little different as the motor case actually touched the buried Bonded gas line probably would have happen either way.
 
Here in NJ the requirement is for bonding the hot and cold water pipes not the gas pipe since that's bonded by the electrical appliance connected to it. FWIW I wrote a proposal to put language in the 2017 NEC that stated that the bond between the two water pipes was not required and so far it has been rejected.
 
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