Scott:
What I meant to say was that I don't have any CAD software here at the moment, and I don't have a scanner either, so a hand sketch by fax or snail-mail is about all I could manage right now.
The possibility of the combined leakage current of different circuits occurred to me as well, which is why I decided to go to the main panel and megger the whole lot to get an overall reading with various appliances on and off.
The 200M+ and 400K were the correct readings. Admittedly that's a 500V DC test and the actual leakage at 240V AC could have been higher, but this is of no consequence to the final outcome. By the way, I don't want to sound critcal, but I think your long hard day has taken its toll....<g>. You'd better check your math again!
The idea of an accumulation of current is along the right lines, but it's not earth leakage through any of the appliances mentioned.
Any more thoughts before I reveal all?
