Dave AND Andy (how does one respond to 2 posters in one reply?)
Right, am now on my laptop so typing and posting is easier!
Taking it from the top...
The konvertor is plastic casing, just like any normal downlighter transform= er, you'd find in a ceiling void. The twin and earth flex comes into the top of the cabinet gear casing, is h= eld by a bracket to keep it from pulling at other connections. The cores then go into the clip-shut choc block, then the brown(live) goes = to a rocker switch (rubber membrane covering) then onto the konvertor; blue= (neutral) -> konvertor; green/yellow(earth) to the cabinet outer casing whe= re it is fixed to the casing with a screwed/clamp terminal.
The cabinet came with the flex coming out the top, all ready to connect to = the mains... no need to open casing. This was connected, through the wall, = to a recessed, switched FSU - inside my kitchen 'utility cupboard', purpose= built to house dryer, washing machine and fridge freezer with all relevant= plumbing feeds, electrical feeds and drainage.
I am now planning to check... a) The connections inside the FSU to see if earth has come loose b) temporarily bond the plumbing pipework in utility cupboard to earth as s= ome sections have been replaced in the house, with plastic, over the years = and am wondering if the route to earth has been broken somewhere.
Does all this provide further clues to you guys in solving this debacle :)
I can photobucket images of the top of the cabinet if needs be, but the cab= inet has been installed 'as it came' and it must have been tested before le= aving the factory!
So I'm pretty sure now that the fault is elsewhere but bow to your superior= knowledge and experience... until I do my part P, hopefully this year.