Re: Carriage bolt spark gap equation

["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>

Did the bolt heads have any markings/raised letters on them, or were they
perfectly smooth?

And, were they cad or zinc plated?

Good job on the measuring..

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, October 25, 2002 4:59 PM
Subject: Carriage bolt spark gap equation


> Original poster: "Rothman, Aric by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Aric.Rothman-at-Honeywell-dot-com>
>
> In the course of hi-pot testing some capacitors, I also took the
> opportunity to measure the DC breakover potential for
> the 1/4" thread carriage bolt safety gaps which protect the capacitors.  I
> used a hi-pot testing station which generates
> DC voltages to 35kV.  Over the range of 4500V to 20,000V, the relationship
> of gap spacing to voltage was very linear.
>
> The equation I derived from the data is:
>
>  gap spacing (inches) = 1.338 V + 0.0257, for Voltages from 4500V to
20,000V
>
>
> Perhaps this equation will prove useful for those who use these types of
> carriage bolts for building safety gaps and the
> like.
>
> Aric
>
>
>