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RE: SAFETY GAP CONNECTIONS



Original poster: "Qndre Qndre" <qndre_encrypt@xxxxxxxxxxx>

Hello Ed,

normally the center tap IS tied to RF-ground to be at the same potential as secondary base. Connecting it to mains ground is a bad idea. Safety gaps protecting your transformer from radio frequency from the primary circuit MUST also be wired to RF-ground since connecting them to mains ground would put radio frequency current into the mains destroying sensitive equipment. Also it's good when they are at the same potential as the center tap. Just remember that stuff grounded to RF-ground (so is for example the transformer's core) is not safe to touch during operation since it might have some voltage potential due to the ground line acting like an inductor for high frequencies.

Regards, Q.

----Original Message Follows----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: SAFETY GAP CONNECTIONS
Date: Sat, 17 Dec 2005 13:53:58 -0700

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

From some of these discussions I get the impression that there is a recommendation that with a "two-gap" system protecting an NST the center terminal of the gap should go to "an RF ground" SEPARATE from the center tap (usually case) of the NST. That sounds wrong to me as I can't see how such a connection would necessarily protect the transformer from inadvertent over voltage conditions. Connection to the center tap AND a good RF grounds makes more sense.

Ed