On Thu, 03 Sep 2009 09:14:41 +0100, Invisible 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?

Because the bare wire isn't exposed, it's insulated.  And in order to 
short out, you have to have a path for electrons to flow.  Arguably it 
would take a pretty strong rainstorm to give the current someplace to go 
to.

Jim

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