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My current pole transformer safety gap is a horn gap and has 2 poles: one pole for each of the 2 HV leads. The other type that I have seen, used mainly on NSTs, uses 3 poles: 2 poles for the HV leads with the 3rd pole being ground located between the 2 HV terminals. Is there any advantage in using one or the other for pole transformers? Steve _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla