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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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