- Reaction score
- 8,697
Initial fault was RCD tripping, narrowed down to a ring final cct.
IR tests on that cct with all loads removed were showing almost zero between neutral and cpc.
So I broke the ring apart and eventually found the nail through a cable, and got that all sorted.
Now its testing ok in as much as r1+r2 and r1 + rn tests at sockets are all well within range, earth loop ok and RCD test ok.
Wish I'd walked at this point - but thought I'd better double check IR again for peace of mind.
Insulation tests between phase and neutral for that cct are around 600 Mohm. No problem there.
But insulation tests between phase and cpc are 75Mohm from one end of ring and 171 Mohm from other end of ring. This is a new one on me.
My only idea was a loose earth connection at a socket somewhere. I've now checked all connections are tight at each socket, and it's made no difference.
So slightly curious in whether others would take view that it's a pass from both ends and time to move on, or start pulling whole thing apart again!
IR tests on that cct with all loads removed were showing almost zero between neutral and cpc.
So I broke the ring apart and eventually found the nail through a cable, and got that all sorted.
Now its testing ok in as much as r1+r2 and r1 + rn tests at sockets are all well within range, earth loop ok and RCD test ok.
Wish I'd walked at this point - but thought I'd better double check IR again for peace of mind.
Insulation tests between phase and neutral for that cct are around 600 Mohm. No problem there.
But insulation tests between phase and cpc are 75Mohm from one end of ring and 171 Mohm from other end of ring. This is a new one on me.
My only idea was a loose earth connection at a socket somewhere. I've now checked all connections are tight at each socket, and it's made no difference.
So slightly curious in whether others would take view that it's a pass from both ends and time to move on, or start pulling whole thing apart again!