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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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    mapj1:

    Round numbers like 1 million have the feel of some one trying to make a good stab at an order of magnitude.




    There is also the point that when reading a meter (at least, one of the older ones with a scale and needle) it is possible to say that a reading is less than 1MΩ (or not) while if it was 0.97MΩ it would be a bit of a challenge.

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    mapj1:

    Round numbers like 1 million have the feel of some one trying to make a good stab at an order of magnitude.




    There is also the point that when reading a meter (at least, one of the older ones with a scale and needle) it is possible to say that a reading is less than 1MΩ (or not) while if it was 0.97MΩ it would be a bit of a challenge.

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