Neutral at dimmer switch?

[JohnS888]

Evening all

I went to someone's house today to look at a lighting circuit for them that's is tripping rcd. While there on a circuit as far as I can make out at moment that is not interconnected in anyway to offending circuit they have 230v at a switch between switch feed and what I think should be switch live. I know there is some intelligent dimmers/switching that requires neutral but this really shouldn't be present should it??? This is second dimmer they have tried to connect into and now isn't working although they said first one did work for quite a long time. Looks to me like light got to be dropped and reterminated into SL?

 

[telectrix]

0.15Meg. will not trip a 30mA RCD, the threshold is about 8K. and 0.15Meg. is suspiciouslylike the reading you get from a neon.

 

[JohnS888]

Thanks all for comments even the ones pointing out what a doughnut I was being around the sw live think because dimmers kept blowing. I got to bottom of the lighting some how that dimmer on that circuit was affecting the lighting circuit that was tripping and had the IR readings of around 0.15 on both L-E and N-E. I can't really understand why this was creating the readings I was getting as I had all conductors of circuit disconnected and all loads off

 

[JohnS888]

Is there anybody that can describe to me how this fault was occurring. For the life of me I can't see how a dimmer switch connected on one circuit could be tripping the rcd out on a different one?