>> 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.

Indeed. This is why it works when they're dry.

However, when those insulators are covered with a continuous layer of 
water...

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