>> Are you sure that every part between the pylon structure and the cable 
>> can get wet to form a continuous path?  It seems to me like part of the 
>> design of the insulator is to keep other parts dry:
>>
>> http://en.wikivisual.com/images/3/33/Pylon.detail.arp.750pix.jpg
>
> How do you figure that?

Well they're like mushrooms stacked on top of each other, so presumably the 
narrow bit right up inside the mushroom "cap" stays pretty dry, unless the 
rain is going upwards.

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