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What do you mean John, I don't understand?

Ahh, thanks Andy I get it!  I appreciate your input, many thanks.

Hi Andy, Good point.  But how do you isolate the circuit with the earth fault then if the fault is on a different circuit to the one you are testing - surely it could be on any of the circuits as all the earth's are connected?

Sorry, its too late and my brain is already hurting on other stuff - missus not helping! I will have an answer for you but I need some time to think and research. The regs does say that insulation resistance tests should be conducted with the protective conductor connected to the earthing...

Pro Dave, can you expand a bit ion yesterday's question, not sure if the answer: But that's not the end of it. A N-E fault can cause an rcd to trip when a heavy load is drawn on a different circuit. Can you work out why or how? Thanks Andy, that's really helpful too!  I'll let you know if I...

Cheers Pro Dave, for the inexperienced, wiring of switches (which should be quite obvious in theory) is a bit of a headache!  

Thanks Pro Dave, does it make any difference (except for the on/off switch position) if the red was in L 2 and the blue in L 1 (ie the other way around?) Meant to say as long as the corresponding L1 and L2 is used on the remote switch.

Thanks Andy, this is a picture of the switch plate at one end, there are 10 separate cables in here for the 4 switches but I have brioken it down in my previous post to 5 cables for 2 switches and then just the wiring for one switch.   If you remember I thought I had fixed the rcd tripping...

Please, as little abuse as possible appreciated: I have a 4 gang switch at each end of the room serving 4 sets of 12 v lights, one switch for each set of lights.  For ease I will describe the cabling for one half of the switch plate (i.e. 2 switches as it is mirrored for the other 2 switches...

Hi Pro Dave, Is it because the high current draw is inducing a current in a neighbouring circuit?

Yes I recognise it is very low.  Why doesn't the rcd trip then?

Hi Pro Dave, Reading should be 1 M ohm or greater however it is accepted that in the field a measurement above but close to this number should still be considered a fault.  The lower the Mohm reading the less resistance is being found - the resistance of the conductor if insulation is good...

Hi kerching, Opps, the cal at the bottom should be 560/16000 = 0.035A Test was at selected tester voltage of 500V but the tester screen gave me an actual reading of 560V during the test. I just noticed that 2 of the line conductors were not connected when I visually checked the light switch -...

Andy, you might be the most experienced electrician on the planet but if you keep up the attitude you will keep getting the same s**** back.  Why don't you try to be helpful for once instead of just being a d***?  I (and I'm sure other posters) would prefer to see an intelligent and helpful...

Here are my measurements for 4 of the circuits so far.  I removed each L, N and E and connected directly with crocodile clips (I removed the L's as one mcb had two circuits and it was just easy to remove the others as well although I know I didn't need to Andy): All numbers are Mohms Kitchen...

Hi Noz, yes, I meant to say that I should have been more precise with the M instead of m in my post.

Understood. M m.  Thanks.

Hi Andy, What do you think I should be reading?

Hello All, I didn't have time today to check the readings taken last week that have been discussed here as the client needed the RDC tripping issue sorted - which is is!  Loose wiring in the switch plate. I ran an Insulation Resistance test with 500V at the DB in the stable block.  The system...

Oh no, you mean I have to go to the pub after work tomorrow?!