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Minimum values of insulation resistance

Wombat
What is the science behind the 1 MOhm minimum insulation resistance? What is the basis for this particular value?
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    Harry Macdonald:

    However, if you do get 1Mohm on a new, clean, dry bit of wiring it is probably a good idea to investigate why before saying "OK, it passes". But is it is on a circuit with several old motors and contactors then no need to investigate further.

     




    Ahbut, you are meant to disconnect or isolate equipment, it's the circuit wiring that's being tested, anything other is not a true record.


    Jaymack

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    Harry Macdonald:

    However, if you do get 1Mohm on a new, clean, dry bit of wiring it is probably a good idea to investigate why before saying "OK, it passes". But is it is on a circuit with several old motors and contactors then no need to investigate further.

     




    Ahbut, you are meant to disconnect or isolate equipment, it's the circuit wiring that's being tested, anything other is not a true record.


    Jaymack

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