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OK, yes this is making sense now I think, I'll probably blow it with this:
The grounding circuit is there to carry fault currents back to source. a standard circuit has two ground circuits, the neutral and the ground. Normally the neutral will carry current back to source but if this is compromised the ground will do it. In my case the ground at this shed is a ground rod. So if I do not isolate the neutrals from the grounds then any fault current on the ground will actually go to ground seeking out any path back to source, which could be a phone line, cable wire, water line etc. This then would energize that path possibly putting dangerous voltage on the phones, cable wires, etc. So at this shed I need to isolate the neutrals from the grounds, or isolate the ground rod wire from the other neutrals/grounds? I think I've almost got it, I really appreciate you taking the time to educate me Speedy Petey.
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