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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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    I remember reading somewhere that the fire brigade were responsible for demanding that a suitable value of 1.0MCopyright  insulation resistance exsisted between live-earth and live-live after an installation had been completed and then retested 2 weeks later to verify that it hadn't dropped off.

    Legh
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    I remember reading somewhere that the fire brigade were responsible for demanding that a suitable value of 1.0MCopyright  insulation resistance exsisted between live-earth and live-live after an installation had been completed and then retested 2 weeks later to verify that it hadn't dropped off.

    Legh
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