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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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    I tested a motor today. IR > 999 MΩ pretty quickly and maintained over 10 minutes, so it seems to be a pass.


    If I have understood this correctly, the meter must apply 500 V (or whatever) for the 10 minute period. On the first attempt, my MFT switched itself off, so one has to ensure manually that test voltage is maintained every three or four minutes in order to apply a steady potential.


    I started with fully charged batteries, but they needed to be recharged again afterwards. Where did the energy go?


    Above all, did I perform the test correctly?
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  • 0
    I tested a motor today. IR > 999 MΩ pretty quickly and maintained over 10 minutes, so it seems to be a pass.


    If I have understood this correctly, the meter must apply 500 V (or whatever) for the 10 minute period. On the first attempt, my MFT switched itself off, so one has to ensure manually that test voltage is maintained every three or four minutes in order to apply a steady potential.


    I started with fully charged batteries, but they needed to be recharged again afterwards. Where did the energy go?


    Above all, did I perform the test correctly?
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