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Every day is a school day.  The main thing I have learned about this is the fact that although an IR reading can be really good, there can still be issues with the circuit.  I don't have a clue about how lift systems work but assumed that maybe a slight fault perhaps developed after it had been...

Yes I have actually bought one!  Been playing around with it on a job today just to see what readings I came up with.  I can see it being very useful!

Sorted!   Ok, so I did a ramp test with everything disconnected and it popped out at 25mA then added the circuits one by one and got a leak of only about 3 or 4 mA, that's with all appliances etc connected.  Until.... I turned on the final circuit which is an old immersion heater circuit that...

Yeah I thought there would be a good chance of a culmulative fault current.  When the new RCD arrives I will go back and start with a ramp test.  I have also located an earth leakage clamp meter I can borrow. I will ramp test with every thing plugged in and then with the circuits all unplugged...

Yeah I've been looking on t'interweb for one.  I've been a sparky for 28 years and seem to have managed without one, however I'm starting to see the benefits of having one even after all this time.  I will report back in a couple of days when I go back.

Yeah I did wonder about that but there are no real faults , I think 60 MΩ or so to earth. The offending RCD above. No he didn't mess with anything, he just plugged it in. I think I can't do too much until I try the brand spanking new replacement one.  Along with a proper ramp test. 

TN-C-S.  The property was built in the late 80's so it's not exactly ancient and pretty much unmolested too.

No unfortunately I don't have an earth leakage clamp meter.  and tbh thinking about it now I didn't actually do a ramp test, just a full RCD test - I will do a ramp test when I go back there after the new RCD arrives.  I think the biggest head scratching part is the fact that there's no fault on...

Thanks for the reply.   The AC unit was just plugged in, so was on a socket circuit supplied by the RCD, so all my tests have been done with the AC unplugged. As for a process of circuit elimination, it has been a bit interesting - there are 8 circuits protected by the RCD, and when 7 of them...

Hi everybody.  First time post so please be gentle... I have just been to a house after a friend of mine has appeared to uncover a fault with a Crabtree 3 module RCD on a split load board that keeps tripping out when he plugs in a small air con unit that he has just installed. But with the air...