Discuss RCBO tripping next door RCBO in the UK Electrical Forum area at ElectriciansForums.net
Always a joy to behold your drawings RB !Just thinking about some possible scenarios, not with any valid basis behind them, but if the resistances of a particular fault are just right then it could be possible to get similar, but perhaps not the same, effects as described in the OP. Though it is just off the cuff thoughts.
View attachment 48134
Just thinking about some possible scenarios, not with any valid basis behind them, but if the resistances of a particular fault are just right then it could be possible to get similar, but perhaps not the same, effects as described in the OP. Though it is just off the cuff thoughts.
View attachment 48134
The RCD operates if there is an imbalance in the voltages coming in on the live conductor and going out on the neutral conductor.So if there is N-E fault implies that some of the voltage from the neutral conductor is diverted to the earth conductor and the RCD will sense that imbalance and trip.This same thing happened to me a few weeks ago. It was very confusing. I went home, came back the next day refreshed and figured it out.
Have you done any IR tests? You need to see if one (or more) circuits have IR faults. My RCD would not trip when tested with the conductors all in place but when I disconnected them the RCD tripped as it should when tested, therefore you know there is no fault with the RCD. Two of the circuits tested as 0Mohms N-E. I found the fault(s) reconnected everything and the RCD passed the tests.
For some reason, on rare occasions, a N-E IR fault can actually stop the RCD from working. I don't know why.
imbalance in the voltages coming in .
A common problem when installing RCBOs where previously there were only RCDs is "borrowed" or common neutrals. I would suggest checking for continuity of neutrals in different circuits, after disconnecting from DB.Testing an RCD on one rfc upstairs tripped the upstairs and downstairs circuis, which was the RCBO next door to it. Turned off the power to all circuits tested downstairs RCBO on its own RCD failed 1x and 5x tests. Disconnected conductors from this RCBO tested RCD at the board worked ok. Put cables back in failed RCD tests. Removed every fuse from every fuse spur and disconnected all plugs etc. Tested ok. Put all the fuses back and all plugs switched on tested again all ok. went upstairs tested rcbo tripped individually. madness ?
Reply to RCBO tripping next door RCBO in the UK Electrical Forum area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.