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its a TT supply with Ra @ 67ohms, the switch is 4 pole, i'm  now unsure exactly what, but I will check tomorrow the earth leakage trip is adjustable from a 1000ma to 300ma, from 1 sec to 300ms. fed off this switch are 2 dis boards with MCB's feeding various hook ups, all with rcd or rccbo...

yes I think I can, thanks I hadn't thought about doing this I should be able to detect which phase has the fault or if more than one phase has leakage. Thanks for the input.

all I want is a second opinion on the test results, if as I think they are acceptable the problem gets much bigger as there are a lot of small dis points and hook up points.

OK its a BSEN 60947 type 2 rated @ 300A 36Ka breaking, RCD.

A caravan site is having problems with tripping on one of the mains incomer switches. I have isolated the cable that feeds the distribution board that appears to be where the problem is and have carried out insulation tests with the following results. N - L1 = >500meg ohm, N - L2 = 86m, N -...

ok just saying hi, I will get the hang of this