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Line filter -- where to ground it?

Original poster: "Forest Darling" <fdarling@xxxxxxxxx>

I am going to wire a line filter behind a neon sign transformer in
backwards, but where should I ground the filter to? The NST case, or
the mains ground?

The NST case is going to be grounded to the RF ground (I'm using a
Terry filter on the high voltage side.)

Also, out of curiosity, how long of a spark would you expect a 450
watt 15kV 30mA NST to realistically be able to put out?
DeepFriedNeon's calculator said 36" but that seems very long.