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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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    Indeed, as my very old black and white illustrated book "Electricity" by The Bennett College states, the requirements of the I.E.E. must be met, but some consulting engineers and local authorities have there own requirements for insulation resistance values.


    Z.
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    Indeed, as my very old black and white illustrated book "Electricity" by The Bennett College states, the requirements of the I.E.E. must be met, but some consulting engineers and local authorities have there own requirements for insulation resistance values.


    Z.
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