The RCD in my house keeps on tripping. It used to trip regularly (1-2 daily) for no reason and could be reset after sometimes 4-5 attempts over several minutes. At this point I tried testing appliances in different sockets and leaving things off for a few days. There is no pattern and the RCD even trips when all MCBs are set to off - including those connected to the cooker and lighting which as I understand are not even protected by the RCD. The CU s a memera 200AD and the RCD has a rating of 30mA.
Recently the pattern of tripping has changed and now it trips once every other week or so but will not reset for several hours. Again there is no pattern and as far as I can tell no appliance is faulty.
Is there any other checks I can do (Having no practical electrical knowledge other than a healthy regard for my safety) or will I need to call in an electricain and if so what the likely cost of finding this fault?
Recently the pattern of tripping has changed and now it trips once every other week or so but will not reset for several hours. Again there is no pattern and as far as I can tell no appliance is faulty.
Is there any other checks I can do (Having no practical electrical knowledge other than a healthy regard for my safety) or will I need to call in an electricain and if so what the likely cost of finding this fault?