Re: [TCML] Re. safety gap.

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

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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