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What is OK for insulation resistance for an appliance. I have been testing my electric tools in my garage/workshop and found a lot of them are 1 to 2 M ohms live to earth Is this OK or should they be better, not a lot I can do about it though. They are AC electric motors (lathe, drill) and...

I wonder it anyone has any thoughts on this, I am having problems with the RCD tripping. It’s a 30mA main RCD on TT installation (overhead cables) (yes I know it should be 100mA but it normally doesn’t trip). It only trips in the morning after 7:00AM and stops at 8:00AM when my E7 switches off...