Re: Lightning Damage

"w_tom" <w_tom1@xxxxxxx> wrote in
news:1146541898.086844.173160@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:

Again, if the UPS is plug-in type, then the ground is only safety
ground - not earth ground. Its own specs don't even claim protection

This is getting a bit too complex for me, I am afraid :-). Basically the
whole house's circuit was grounded by copper earth loop in its foundations
(this was a brick house), there was a place where its resistance could be
tested (must be less than 100 Ohms by regulation around here) and there was
a bunch of differential breakers for each sub-circuit.
.

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