Gray Plugs

[Matt S Bower]

rr wrote:

> p.s. speaking of plugs, what is the reason for 'spider webbed' plug insulators?
> 
This is usually caused by contaminates on the insulator and when the
pressure is high requiring higher voltage it will track the contaminates
down the insulator to the ground shell instead jumping to the strap. 
These paths down the insulator then develop thin carbon traces.

Matt
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