"Warp" <war### [at] tagpovrayorg> wrote in message 
news:48f38551@news.povray.org...
> Orchid XP v8 <voi### [at] devnull> wrote:
>> Nope. As the Wikipedia article explains, there are sprung-loaded plastic
>> covers that only move out of the way as the earth pin is inserted.
>
>  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.

When I was at university, there was a noticable potential difference between 
the earth pins on different floors of the same building. It played hell with 
the coax network cable...

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