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Discuss Lighting issue in the UK Electrical Forum area at ElectriciansForums.net

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Has anyone come across this before, client told me all lights were working previous to fuse board change, but when I turn light on in one room to a fitting with lamp in, it trips out RCD, when lamp is removed and light switch is turned on and off RCD stays on, all other light fitting with lamps in on same circuit(4 in total)all work as they should, I have checked insulation resistance , there is 230v between live and neutral when switch on at the lamp holder , then 0v between live and neutral when switch is switched off. This has got me totally stumped, please help
 
Could be that the fixing screws for the ceiling rose have penetrated one of the cables above the ceiling, creating a fault from neutral to earth, which would only cause the RCD to trip when the lamp is in and switched on.

Or somewhere else along the same part of the circuit.


Literally had this a week ago.
Luckily there was only two lights on the circuit so was a quick fix.
It always ends up being the last thing you suspect!
 

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