On Thu, 03 Sep 2009 09:14:41 +0100, Invisible <voi### [at] devnull> wrote:

>Rain water isn't chemically pure. (Depending on pollution levels.) Once 
>the pylon gets wet, it's entire surface is covered in a continuous sheet 
>of water, which also covers all of the cables. So why don't they short out?

There are insulators between the cables and pylons so there is no path for the
electricity to flow there. The conductors are spaced far enough apart so that
the electricity cannot jump between them. This is called engineering. ;)
-- 

Regards
     Stephen

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