- Reaction score
- 5,607
I'll start with an embarrassed face
Davesparks was right.... again! Damn that man!
Took the outgoing conductors out of the RCD, RCD tests fine. In fact all I needed to do was switch the main switch off of the CU and it tested fine.
As soon as the main switch is switched back on then the RCD will not trip when tested.
I removed the neutral of the circuit with the fault (0.27ohms N-E) from the neutral bar and then the RCD tested as it should even with the main switch on.
Obviously the only reason my RCBO worked on another corcuit was because it wasn't being affected by the N-E fault on the faulty circuit, obvious now!
So..the RCD is fine but the short between N and E is stopping it from functioning when tested.
I shall code accordingly.
However, I do have one last question... Will this RCD still work as it should whilst the fault is there? Do the clients have working fault protection?
Davesparks was right.... again! Damn that man!
Took the outgoing conductors out of the RCD, RCD tests fine. In fact all I needed to do was switch the main switch off of the CU and it tested fine.
As soon as the main switch is switched back on then the RCD will not trip when tested.
I removed the neutral of the circuit with the fault (0.27ohms N-E) from the neutral bar and then the RCD tested as it should even with the main switch on.
Obviously the only reason my RCBO worked on another corcuit was because it wasn't being affected by the N-E fault on the faulty circuit, obvious now!
So..the RCD is fine but the short between N and E is stopping it from functioning when tested.
I shall code accordingly.
However, I do have one last question... Will this RCD still work as it should whilst the fault is there? Do the clients have working fault protection?