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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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  • mapj1:

    I think those are 'potential' dangers. Diverted neutral currents flow up every water and gas pipe in some streets, without injury, as the DNOs do not distinguish between N and E, and in other parts of the world an NE bond would be permitted and in some cases required by regulation .

     




    Agree that Diverted Neutral Currents is not always immediately dangerous. It could be difficult to quantify the risks in an installation that was not designed for it, though.


    When added to the potential for disrupting protective devices, however ...

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  • mapj1:

    I think those are 'potential' dangers. Diverted neutral currents flow up every water and gas pipe in some streets, without injury, as the DNOs do not distinguish between N and E, and in other parts of the world an NE bond would be permitted and in some cases required by regulation .

     




    Agree that Diverted Neutral Currents is not always immediately dangerous. It could be difficult to quantify the risks in an installation that was not designed for it, though.


    When added to the potential for disrupting protective devices, however ...

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