RCD Trips when we get heavy rain?

[AshFR]

Hi all. Got a bit of a problem. When we get heavy rain like we did today, the RCD trips. So i push it back on and sometimes it will stay there for months or it sometimes again instantly. Any idea what the problem is? I do have 2 outside lights and a PIR sensor on them. Im thinking the problem lyes there but could do with a bit of advice to testing it. It will come in handy aswell as i need a fault finding job for my college work Thanks all.

 

[Guest111]

As others have said make sure its dead before you start your tests,someone once said "Is it dead and I,m alive or was it live and I am dead?"get it wrong and thats one question you will never know the answer to!I owe all of my experience to the fact that I take safety seriously thereby living long enough to get experience.