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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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    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.

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    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.

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