Tim (Remove NOSPAM. wrote:

What if incoming water pipe is plastic? (no oil or gas)

If the house is plumbed in copper the need for main bonding is
unaffected. If the house is plumbed mostly in plastic then no main
bonding to the water service is required.

The Earth rod is then sufficient??

Err, what earth rod? Are you talking about a TT installation?

--
Andy