Hi Wojtek,
We do not have any isolation certifications for the AD215.
If it helps though, footnote number 4 on page 3 of the datasheet provides some information on the isolation voltage:
"The isolation barrier (and rating) of every AD215 is 100% tested in production using a 5 second partial discharge test with a failure detection threshold of 150 pC. All “B” grade devices are tested with a minimum voltage of 1,800 V rms. All “A” grade devices are tested with a minimum voltage of 850 V rms."
Thanks,
Kris