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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?
Parents
  • Indeed - and if it came to a choice, I'd rather forego the insulation test in favour of a thorough inspection. Eyes, ears fingertips and nose can be very good at detecting things meters can miss.

    I think a few years ago there was a discussion about which test was the most important, in a sort of Desert Island Discs way ' if you could only take one meter with you ?' sort of way. We decide that an R2 test was the most useful, as any other fault would become  obvious in a safe way on switch on.

    I think for PAT or EICR then similar considerations often apply.
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  • Indeed - and if it came to a choice, I'd rather forego the insulation test in favour of a thorough inspection. Eyes, ears fingertips and nose can be very good at detecting things meters can miss.

    I think a few years ago there was a discussion about which test was the most important, in a sort of Desert Island Discs way ' if you could only take one meter with you ?' sort of way. We decide that an R2 test was the most useful, as any other fault would become  obvious in a safe way on switch on.

    I think for PAT or EICR then similar considerations often apply.
Children
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