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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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    A local church asked me to do their PAT, they had never had it done before and I condemned several items including the bell ringers electric heater because I could see the copper conductors through the gaps in the cable insulation and also I also put an advisory note on the churchyard Christmas tree lights because they had an insulation value of around 1 Mohm despite having been on top of a cupboard in the vestry for several months.


    They have not asked me to do the PAT again.


    Andy Betteridge
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    A local church asked me to do their PAT, they had never had it done before and I condemned several items including the bell ringers electric heater because I could see the copper conductors through the gaps in the cable insulation and also I also put an advisory note on the churchyard Christmas tree lights because they had an insulation value of around 1 Mohm despite having been on top of a cupboard in the vestry for several months.


    They have not asked me to do the PAT again.


    Andy Betteridge
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