On Nov 23, 5:38*pm, D Yuniskis wrote:

Grounding the mains to "plumbing" *was* common in the US many
years ago. *Now, I believe, you *must* ground to a metal
rod driven into the earth (8 ft?).

Just to be clear, my copy of the US National Electric Code clearly
requires (section 250-80) plumbing to be bonded to the electrical
service
ground, it just doesn't allow the buried water piping to substitute
for
a ground rod or similar to-the-soil connection.

The ground wire from the interior water pipe grounds the pipes, not
the
electric wiring.