SMPS transformer hipot test without any damage whatsoever

[Faringdon]

Hi, we want to test the isolation of a offline 240vac one tran forward transformer.
But as you know, these cause small cumulative damage...what is the isolation test voltage which does no damage whatsoever?
This txformer looks like just ECW against ECW, with no margins...which, as you know, wouldnt pass normal hipot...but i dont want to blitz it with 3500VAC for 1 second.

[jonpaul]

FTTS just more click bait.
nonsense Q as always everything in your question is false
j