Fault Finding Problem

[philly4321]

I find fault finding a methodical process, I will however find it very rewarding once problem is found. The other factor that I find confusing is that no work has been completed at the property so causes of the problem have got to be something environmental

 

[Goody]

I had an IR reading of "0" bet L & N. Opened up two FCU's on the ring with neons, cleaned and checked for gremlins, put back and the reading came up with 469 meg ohms.

 

[dixon9]

The fact that you have 0 between N and E AND L and E leads me to think it may well be a trapped cable that has pierced all 3 cores....or, as said before, water in a junction box. This is not just a N to E fault as your meter has revealed.

 

[Amp David]

Sockets in kitchen cupboards seem to be a favorite on all my fault finding jobs, or hidden sockets behind an appliance.

Had one last week, RCBO kept tripping out. I started by asking the home owner what they were using when it tripped. A lawn mower, so started and removed that socket to find it faulty.

 

[miner69er]

had a good one yesterday in a factory unit. lost all sockets. located fault on socket ring there was a picture hanging on a nail which had peirced line-earth and on top of that a nail holding suspended ceiling edging up which had peirced neutral-earth. both these nails had been in place for at least 12 months!!!! why the rcd had not tripped before is baffling me, after repairs were made rcd tripping times I/R etc all ok.
forgot to say the cables were feeding a socket in a w/c hidden behind the cistern....!!!!
some plumbers really need to hire a brain before plodding off to work.

 

[SimpleSimon]

Yesterday went to a school with floor lights in a canteen area. We only installed them six weeks and already tripping out. 
There's 13 lights and they are all encased in the floor so once I locate the specific one I'm going to have great fun telling them it's coming out. 
IR tests where showing ok, not brilliant for cable installed six weeks ago but passable and continuity was going bonkers with 8890 ohms!!!! Sounds like water damage somewhere.

 

[SW1970]

philly4321 how did you get on?