rcd tripping

[matt12321]

ive got an rcd that keeps tripping on a split load board. circuits 3 ring mains, 3 lighting circuits and 2 boilers. insulation tests come back greater than 1M on all circuits, what else could it be, faulty appliance, rcd? what else could i look for

 

[Richard Burns]

Agree with the above advice and if it is a random time fault and happening overnight then I would be concentrating on items that are on all the time: fridges, freezers, possibly central heating boilers (video recorders, microwaves, clocks these are less likely as there is no changing going on.)