The worst case of ground potential difference that I have heard of is a case
where guy got a shock from the grounded metal reflector of his trouble light
while working outside on his car.
Turns out the pump in his neighbor's well (fed from the same transformer) had a
short from from line to ground. The potential difference between the
ground tied to line at the neighbor's and the ground tied to neutral at
this guy's house caused a voltage gradient along ground between the
properties high enough to cause a shock when enough distance was covered
(by the cord of the trouble light).
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
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