Re: [TCML] Safety Gap Construction

["DC Cox" <resonance@xxxxxxxxxxxx>]

Yes, 3 brass ball with the center ball grounded.

Actually, you don't have to use brass balls.  I use a cut up stiff steel
wire coathanger.  One from each bushing of the nst to the grounded case.

You set them by energizing the xmfr and bending them so an arc will not
occur, usually 1/8" to 3/16" off each bushing to ground.  DO NOT try
adjusting them with the power on --- nsts give a nasty shock if you slip a
bit.

In this fashion any over potentials will arc to the grounded case.

If you do decide to use brass balls (alum. or steel works fine also) they
are carried by McMaster-Carr Company in Chicago.

Dr. Resonance




On Fri, Jun 13, 2008 at 4:23 PM, Nicholas J. Goble <ngoble@xxxxxxx> wrote:

> How do I construct a safety gap?  From what I see, it's just three
> brass balls.  The middle one is grounded and the end two are connected
> to the transformer wires.  Please correct me if I'm wrong.
>
> I only have two questions:
>
> 1) Where can I buy brass balls? I've looked on the internet, but I just
> can't find any.  Or maybe I don't need brass balls at all.  Is there
> some other way I can construct a safety gap?
>
> 2) How can I determine the spacing of the balls? Is there any formula
> to calculate the gaps, or should I just guess?
>
> Thanks again.
>
> Nicholas Goble
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