Flyback transformer insulation testing?

Flyback said:

Hi,
We have a offline flyback transformer which is rated to 4kv/3mA/2seconds.
It we continuously apply 4kv rms (50Hz) to it, (ie for way longer than 2 seconds) then after how long will it eventually fail the insulation test?

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It depends on the safety factor used to design the transformer and the safety factor in the temperature specification and dielectric breakdown voltage of the insulation used for the wire. So, without more information I would estimate some time between 2-seconds and forever.

Flyback said:

4kv rms (50Hz)

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Are you taking primary to secondary insulation?

Are you taking primary to secondary insulation?

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Thanks , yes.