Re: PC board primaries

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Indeed... creeping sparks can typically jump 3 times the distance in free
air. On a PC board the problem is aggravated by the "knife edge" of the pc
board trace.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, December 11, 2001 11:34 AM
Subject: Re: PC board primaries


> Original poster: "Peter Lawrence by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Peter.Lawrence-at-Sun-dot-com>
>
>
> The thing I wonder about regarding all these PC-board primary posts is
that
> the epoxy-glass board may act as a spark conductor, in the sense that in
> many situations a spark may only be able to jump say 1 inch in air will be
> able to jump more than 1 inch if there is a non-conductive surface (air to
> non-conductor surface) between the electrodes, for example the circuit
board.
> This comes up in capacitor design, the "air" distance between conductors
in a
> capacitor needs to be much longer than 1-inch-per-75kV since sparks tend
to
> travel longer when there is a "surface" to travel along. I'm not sure what
> the correct terminology for this is, but I'm sure many folks on this list
> know about and have also experienced what I'm talking about...
>
> Pete Lawrence.
>
>
>