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Minimum values of insulation resistance

What is the science behind the 1 MOhm minimum insulation resistance? What is the basis for this particular value?
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  • Not quite. If you get 1 MΩ for a whole board IR test, you know that all circuits have passed. However, if it is less, then you need to test each circuit separately.



    OK, it's late and I'm usually slow on the uptake, but why? If a whole board IR comes in at less than 1MΩ - then isn't it just a simple fail? (working out which is the culprit is fault-finding rather than testing).

        - Andy.
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  • Not quite. If you get 1 MΩ for a whole board IR test, you know that all circuits have passed. However, if it is less, then you need to test each circuit separately.



    OK, it's late and I'm usually slow on the uptake, but why? If a whole board IR comes in at less than 1MΩ - then isn't it just a simple fail? (working out which is the culprit is fault-finding rather than testing).

        - Andy.
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