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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
  • Many older installations have had a N to E fault on them for years with no bad consequences. It is only when a new consumer unit is fitted with R.C.D.s that the problem becomes evident.


    Z.
Reply
  • Many older installations have had a N to E fault on them for years with no bad consequences. It is only when a new consumer unit is fitted with R.C.D.s that the problem becomes evident.


    Z.
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