Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Pomnept-at-aol-dot-com> I am expecting 2 new 15k -at-60mas soon. I am told they have "ground fault interruption" circuitry but that Tesla coilers can and have used them without trouble. I am usihg Terry Fritz' protection circuit. Anybody out there with experience/ideas on this? Thanks in advance. Robert H.