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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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    Chris Pearson:



     My question is, however, can the PI test be done with yer ordinary Megger, or does it require different equipment?



    Ordinary Megger, though I would suggest not one of the (now antique) hand wound ones that I remember from my youth........

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    Chris Pearson:



     My question is, however, can the PI test be done with yer ordinary Megger, or does it require different equipment?



    Ordinary Megger, though I would suggest not one of the (now antique) hand wound ones that I remember from my youth........

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