Re: flashover

["Herwig Roscher" <herwig.roscher-at-gmx.de> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Terry Fritz wrote to the list:
> Thus letting the air and distance do most of the insulating work. 

Terry,

Because I'd like to understand the physical background of your 
advice:

The punch through voltage of insulators like PVC is much higher 
than that of air. Wouldn't the screening effect be better at a place 
where the E-field is stronger (closer to the secondary)?

Could you please enlighten me?

Regards,

Herwig