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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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    So the fact that the RCD isn’t tripping is not a good indicator of the likely outcome of an insulation test,  neither is using an earth clamp meter or for that matter a thermal camera to check an installation that is not fully loaded much use.


    The insulation tester may be basic, but it is very useful.


    Andy B.
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    So the fact that the RCD isn’t tripping is not a good indicator of the likely outcome of an insulation test,  neither is using an earth clamp meter or for that matter a thermal camera to check an installation that is not fully loaded much use.


    The insulation tester may be basic, but it is very useful.


    Andy B.
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