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Hi Steve,
A three-terminal gap is only necessary if you're using a two-eared pole
transformer with both HV outputs floating versus ground. This provides a
safe path to ground in case of a primary strike.
Many coilers ground one end of the pole transformer's HV winding, and
also connect this to the inner-most primary turn of the primary, and RF
ground. In this case, a two-terminal gap is fine.
Bert
--
Bert Hickman
Stoneridge Engineering LLC
http://www.capturedlightning.com
+1 630-964-2699
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Steve White wrote:
<snip>
I also have a safety gap question. My safety gap is just a simple 2-terminal horn gap connected in parallel with my RSG. I see that the safety gaps used for NSTs consist of 3 terminals: 2 for the high voltage leads and a central ground terminal. For pole transformers, is there any advantage favoring the 3-terminal gap vs the 2-terminal gap?
Steve
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