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Insulation Resistance -old requirement

Ismael Ochoa
I have just come across a insulation resistance (IR) test requirement stating that the IR  R2/R1 > 0.7 where R1 is the IR before a Dielectric test ( 2000VAc for 1 min ) and R2 is the IR after the Dielectric test. Has anybody seen this requirement before?, if so what are the technical basis for this? Nowadays, standard only requests that IR should greater than certain value which depends on the equipment rated voltage.
Comments will be appreciated

I
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    Sounds like it's checking that the HiPot (2000V) test hasn't damaged the insulation (too  much). HiPot tests usually aren't done during routine testing (because they can stress otherwise sound insulation) so it sounds like a one-off manufacturing test, or possibly even a type test on a sacrificial unit.

      - Andy.
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    Sounds like it's checking that the HiPot (2000V) test hasn't damaged the insulation (too  much). HiPot tests usually aren't done during routine testing (because they can stress otherwise sound insulation) so it sounds like a one-off manufacturing test, or possibly even a type test on a sacrificial unit.

      - Andy.
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