Re: capacitor safety gaps

• To: tesla-at-pupman-dot-com
• Subject: Re: capacitor safety gaps
• From: RWB355-at-aol-dot-com (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Tue, 06 Oct 1998 17:18:50 -0600
• Approved: terryf-at-verinet-dot-com

Hi Doug,

SNIP 
 If you want to know how I calculated it, I took the 60 mil figure,
 multiplied it by 450V/mil, divided it by 30V/mil, and got 900 mils or .9".
 
 Dg: gap distance in mils
 Wd: dielectric width in mils
 Bd: dielectric breakdown per mil
 Bg: gap breakdown per mil (varies with atmospheric conditions)
 Dg = Bd * Wd / Bg
 
Whew. That sounds like going from California to Alaska via Moskow and Africa.
Why didnīt you just use the volts per inch factor for the spark gap? There are
even formulas/tables out there that consider atmospheric and barometric
conditions.
 
BTW: you can go to 500v/mil poly. Itīs safe enough as my PE destruction
testing has shown me. 

Coiler greets from germany,
Reinhard

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