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Step Down
what is the actual voltage reading on a step down transformer 240/3phase per leg ?

what should i be reading ,when putting my volt-meter on a step down transformer and the volts is 240/3phase? shouldn't be getting 120v per leg going straight to ground?i was getting a reading of 40v on two legs and 70 volts on the third?yet the transformer worked? any help ?

I'm not sure about the actual values you're getting. It depends on the primary and secondary voltage ratings as well as the winding connections (wye, delta, etc.) Can you furnish a description or photo of the nameplate. The voltage applied to the primary winding will also affect the secondary voltage.

It sounds like your transformer has a delta secondary winding with a grounded center tap on one winding. You should measure 80 V phase-to-phase across all three legs.

However due to the center tap, you are measuring 40 V phase-to-ground on two phases and 70 V phase-to-ground on the "high phase". (a.k.a. wild phase)

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