HI. I know since I dont live in UK I shouldnt post forums here but I thought Singapore and UK have a general similarity when it comes to fuse box and stuff, so I would be glad If anyone could help me. First of all my electrical knowledge might not be that great so forgive me if I use a wrong term or anything. My house fuse box has 2 main circuit breaker(RCD ?) and a few smaller circuit breakers. Recently one of the RCDs trips like once or twice a week at a random time. When it has tripped I have not been using any iron,water heater, washing machine or dryer, and the only things that was on was the fridge and everything else was off(including lights). So when it tripped I tried to use the process of elimination, I turned everything off and then I restarted the RCD ( the test button works as it should btw) and then I turned every light and socket and appliance one at a time every 15 minutes, but it didnt trip. Since each time that it trips i'm not using many appliances i dont think it is due to overload. An electrician came and looked at it and he couldnt find any problem, but the RCD still trips randomly every few days. can it be the RCD is faulty? Any advice and help would be appreciated. thank you