friend of mine has a shop that has 5 frigde circuits on a seperate rcd consumer unit. the rcd kept tripping and they narrowed it down to a particular chill cabinet. they had a spark out but he couldnt find the problem. i went and had a look and thought pehaps its just nuisance tripping when moisture builds up as it only trips now and again like every 4 hours. so i took the circuit off the rcd to get it running as all there food and drinks were getting warm. so i thought it would be ok but now the breakers tripping. so its drawing too much current. i originally thought maybe its moisture between live and earth or nuetral and earth for the rcd to trip. for the breaker to trip it must be a live to neutral isnt it? but its still only a few times a day. any experienced fault finders have any suggestions what it could be? im gonna go back and unplug it then megger the circuit to check its not the circuit thats the problem but if it was the circuit it would trip straight away would it not? could it still just be moisture between the live and nuetral conductors? does anyone know why a breaker would trip but only sometimes? it must be a component on the refridgeration side that only comes on twice a day or something. i dont want to megger the fridge itself cos im sure there will be sometihng in there that cant be meggered and then i'll have destroyed it all together. ive suggested he get it serviced.
anyways if anyone has experience something like this before your help would be much appreciated.