[TowerTalk] Rain Induced Voltage

[Jim Lux]

At 11:39 AM 12/1/2006, Bill Turner wrote:
>ORIGINAL MESSAGE:
>
>On Fri, 01 Dec 2006 10:36:38 -0800, Jim Lux <jimlux at earthlink.net>
>  wrote:
>
> >(the free
> >air distance from center pin to shell is probably about 0.15 inches *
> >70kV/inch = 10.5 kV..
>
>------------ REPLY FOLLOWS ------------
>
>Where did the figure of 70 KV/inch come from? My experience and
>training says closer to 30 KV/inch.

71 kV/inch is the approximate breakdown for a uniform field in 
air.  As you note, uniform fields hardly ever exist, so one would 
never use that for practical use.

In metric, 3MV/m is about the same magnitude.