Warp wrote:

>   Is it guaranteed that the difference in potential between the earth pin
> and the physical ground is always very close to zero?
> 
>   Because AFAIK there may be surprisingly large potential differences
> between the earth pins of neighboring buildings at some places.

I'm not an electrical engineer, so I couldn't say. I do know that on 
many appliances the earth pin is physically connected to the metal 
chasis of the appliance, so I *hope* it's similar to the 
surroundings...! o_O

-- 
http://blog.orphi.me.uk/
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