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[TCML] Safety Gap: 2-pole or 3-pole?

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?

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