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Thanks hj:

I can create / install a grounding system for the copper water lines myself by way of bonding them and running a wire from them to a ground rod redundant of the electrical supply's...

Thanks hj:

The connections between the house and its city water supply and the house and its well water supply take place in the masonry walls of the house..............until then it's pvc from...

Thanks hj.

[For your interest the valves in the photo are metric, from England, and are 2 1/4" long........2 1/2'' overall with the nuts and ferrule's installed either side........15mm...

Thanks for the replies so far.

The 2 valves you see in the photo are compression valves........installed so the bathroom below can be shut off from the rest of the house in the event of future...

How do I go about ensuring the copper plumbing supply and branch lines which have recently been replaced in my home are adequately grounded and bonded?

The supply lines are in the attic alongside...

Are there copper sweat or compression fittings available that can be used to join metric copper pipe to imperial copper pipe?

As in English metric pipe 15mm and 22mm to US imperial 1/2" and 3/4"...