Ryan J,
Section 250.104(A)(1) requires the interior metal water piping system and any other metal piping systems likely to become energized to be bonded to the service equipment or grounding electrode conductor.
From the Code CD rom.
The point of my question, was how could a water pipe become energized? I never figured a wire hanging on it, because they all should be strapped up and away from the water pipes.
But what still boggles me is on a well water system, with plastic incoming, and then a change over to metal, why size the bonding jumper for the size of the service? I always wondered how the service conductors could touch the water pipe, if they were no where near it.
I see the answer from poorboys post, I guess the wires could fall somewhere, somehow onto the water pipes.
And I guess the water heater somehow could fail, energizing the pipes.
Dnk....
