- Reaction score
- 131
I received a phone call from a friend the other night telling me his socket werent working and whenever he tried to reset the MCB the RCD would trip immediately. As i couldn't get to him that night i asked him to unplug anything in the affected sockets and then try to reset the MCB, hoping that it may have been a faulty appliance. It wasnt!
I managed to get round to him the next day and repeated the procedure myself for piece of mind only to get the same results. I asked my friend if he had been doing any work around the house just before he noticed the MCB had tripped, which he told me he hadnt, although he had attempted to change a halogen lamp in his kitchen.
The board is a split load type with 100ma time delay RCD protecting two lighting circuits and a 30ma RCD protecting all other circuits. I started to test the circuit and although when doing my insulation resistance test L-N was low. I didnt think it low enough to create a short ( think it was over 10Mohms ), L-E and N-E were clear. I connected the circuit back into the board and just thought id check once more to see if the MCB would reset, and it did. Now i hadnt done any other work other than disconnecting and then reconnecting the circuit from the board prior to my tests. I checked to see if either of the cables were damaged entering the board, wondering if i had inadvertantly disturbed them, but they were fine.
Really struggling to explain this one so any thoughts welcome
I managed to get round to him the next day and repeated the procedure myself for piece of mind only to get the same results. I asked my friend if he had been doing any work around the house just before he noticed the MCB had tripped, which he told me he hadnt, although he had attempted to change a halogen lamp in his kitchen.
The board is a split load type with 100ma time delay RCD protecting two lighting circuits and a 30ma RCD protecting all other circuits. I started to test the circuit and although when doing my insulation resistance test L-N was low. I didnt think it low enough to create a short ( think it was over 10Mohms ), L-E and N-E were clear. I connected the circuit back into the board and just thought id check once more to see if the MCB would reset, and it did. Now i hadnt done any other work other than disconnecting and then reconnecting the circuit from the board prior to my tests. I checked to see if either of the cables were damaged entering the board, wondering if i had inadvertantly disturbed them, but they were fine.
Really struggling to explain this one so any thoughts welcome