RCD TRIPPING - ADVICE PLEASE

[AJT83]

Hi,

Recently got called to a job, a problem with the RCD tripping. Went through the usual procedures of unplugging everything however I realised it wasn't just tripping on one circuit. It trips if you turn the shower on, plug something into the cooker switch and if you plug something into the ring main. Did a ramp test on the RCD and got 27ma. Didn't have time to IR test as the customer was going out. Was hoping somebody could point me in the right direction for when I go back. I presume it's a Neutral - Earth fault but I just don't understand why it trips on 3 different circuits? Even just trying to get a ZS at a socket or the cooker switch trips it (obviously on no trip).

Customer did say they had a leak not so long ago though but don't see why that would cause a fault like this. The RCD just wouldn't reset if that was the case?

Thanks in advance

 

[Octopus]

AND there could be 2 faults - one on a RCD protected circuit and another on a non RCD protected circuit!

 

[Deleted member 9648]

"Didn't have time to IR test as customer was going out"!!!!!
Mate that's the first thing you should have done. Farting about ramp testing and unplugging things, waste of time. Leave everything plugged in and do a 250v test LN-E. Five minutes will establish whether a fault is present. Only when you know what you are dealing with can you make an informed decision on how to proceed, then its time to start farting about unplugging things.
Sorry but it always leaves me open mouthed the number of electricians who come on here about tripping RCD's and haven't carried out IR tests.

 

[Deleted member 9648]

double post

 

[PEG]

"Didn't have time to IR test as customer was going out"!!!!!
Mate that's the first thing you should have done. Farting about ramp testing and unplugging things, waste of time. Leave everything plugged in and do a 250v test LN-E. Five minutes will establish whether a fault is present. Only when you know what you are dealing with can you make an informed decision on how to proceed, then its time to start farting about unplugging things.
Sorry but it always leaves me open mouthed the number of electricians who come on here about tripping RCD's and haven't carried out IR tests.

...You're gonna upset lad's who charge by the hour,with advice like that...

 

[telectrix]

Thanks lads. I was hoping somebody would tell me it wasn't a N-E fault though the house is rank and really don't want to spend any length of time in their!

bloody defeatist. ( and it's there, not their).

 

[telectrix]

thanks, pete. that's my 1st agree since the last 1. .