Re: [TCML] Re. safety gap.

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I currently use a static sucker gap, so i see no need to add a redundant 
parallel gap. When I was using a ARSG, I did have a safety.



----- Original Message ----
From: DC Cox <resonance@xxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Mon, April 4, 2011 11:13:12 AM
Subject: Re: [TCML] Re. safety gap.

A single spark gap is all that is required, and yes ---- you should use a
protective filter.  RF "spider webs") across a HV xmfrs sec coil with no
protection ---- no matter what type it may be.

A lot of people don't do this but they are certainly not following good
engineering practice.

Dr. Resonance





On Mon, Apr 4, 2011 at 3:00 AM, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:

> I have a two terminal 14.4kV 25kVA pig. I ground one terminal, so this
> wouldn't
> work in my case. In fact, I don't use a safety at all on my pig.
>
> When I used NSTs, up to a single 15kV 120ma beast, I always used three
> terminal
> safety gaps.
>
>
>
> ----- Original Message ----
> From: Phil Tuck <phil@xxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sun, April 3, 2011 9:22:41 AM
> Subject: RE: [TCML] Re. safety gap.
>
> I had never considered putting a three ball with an earthed-centre safety
> gap on
> a pig, as I just use a two-horn arrangement on mine. With the winding
> arrangement of an NST however, it makes obvious sense.
>
> Having said that, on a pig it would no doubt help in dealing with a primary
> strike, as it offers a path straight to the RF earth, rather than going
> through
> the pig's windings to the core or case and then earth.
>
> As for over-voltage peaks if your pig has a normal two terminal type output
> (no
> connection to the case), any peaks would still be caught because they would
> just
> go from one ball to the centre and mostly onto the third. Therefore, the
> centre
> earth would matter less in that case.
>
> Be interesting to hear what others think, the archives on this matter all
> relate
> to NST's it seems.
>
> Regards
> Phil
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of
> Phillip Strauss
> Sent: 01 April 2011 13:44
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Re. safety gap.
>
>
> Hello all,
> Could anybody inform me on the relative merits of a two ball safety gap as
> opposed to one with a third central earthed  ( to RF ground) ball to be
> fitted
> across my SRSG.
> Many thanks.
> Phillip.
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