Re: pvc and copper water service
Joe,
250.104(A) is the section that covers bonding of water piping systems. It says nothing about "likely to become energized" (unlike section 250.104(B) for gas piping). 250.104(A) tells how to bond the water piping and does not mention the use of circuit equipment grounding conductors (unlike section 250.104(B) for gas piping). After reading your first post, my only question was whether isolated metal valves would constitute a "piping system" I think not. But, your last post leades me to believe that there may be a copper piping system downstream from the water heater? If so, 250.104(A) requires it to be bonded.