E
edrobbo8
Just been to a call out, 2 x 6A lighting circuits, one tripped out last night which triggered the RCCB on the main switch, so pretty sure it is a L-E fault rather than dead short as MCB switched on fine.
The circuit that caused the problems is one of the 6A light circuits, however the house was wired 10-15 years ago and additions have been made all over the place.
Took the live, neutral and earth out of MCB, neutral and earth bars, and there is ~216V L-N and L-E on the ends of that cable. This made me think that someone has borrowed a live or neutral from the other lighting circuit. Switched off other 6A MCB and tested - nothing, so switched it back on and tested ends of cables again, nothing.
Very strange, any thoughts on this?
Also, I.R test was low at around 3 M Ohms. Re-terminated cable into MCB that had caused problems and it all works fine, checked in a few switches to see if there was a borrowed N or L but nothing.
What would you do? Leave it until it trips again?
Thanks for the help!
The circuit that caused the problems is one of the 6A light circuits, however the house was wired 10-15 years ago and additions have been made all over the place.
Took the live, neutral and earth out of MCB, neutral and earth bars, and there is ~216V L-N and L-E on the ends of that cable. This made me think that someone has borrowed a live or neutral from the other lighting circuit. Switched off other 6A MCB and tested - nothing, so switched it back on and tested ends of cables again, nothing.
Very strange, any thoughts on this?
Also, I.R test was low at around 3 M Ohms. Re-terminated cable into MCB that had caused problems and it all works fine, checked in a few switches to see if there was a borrowed N or L but nothing.
What would you do? Leave it until it trips again?
Thanks for the help!