Stephen Dawson wrote:

"John Rumm" wrote in message
...

Harry wrote:


The one ring main circuit which has rubber insulated wiring passed the
insulation resistance checks easily (the electrician said three times
the suggested minimum), and has caused no problems.

I would not take too much comfort from that. The minimum is 250K ohms -
with decent insulation you would expect a reading of at least tens of meg
ohms with modern PVC insulated wire. Rubber when new would have probably
been higher still.



I think you will find the minimum is 500K at 500V.

Yes sorry you are right. Its 250K @ 250V for SELV and PELV circuits,
500K @ 500V for ordinary LV (240V) ones.

To the OP, your 3x absolute minimum is still below the recommended
minimum of 2M ohms.

--
Cheers,

John.

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