ALL GROUNDS MUST BE UNIFIED!!! ...

Plonk...

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do that if you want BUT its a real issue, all grounds in a home MUST
BE UNIFIED, thats why the ground rods for main service, homes neutral,
telephone NID and everything else must be tied together.

lets imagine they arent, a lightining strike on something might create
a voltage potential between grounds.

I used to install satellite dishes its not a common trouble but could
create a real hazard. heck even building lightning arrestors must be
unified to everything