"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.

Steve Dawson