>> 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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