In article ,
Caecilius wrote:
Have you ruled out an additional 5-15mA leakage elsewhere, adding
to your test leakage?

Sort of. I turned off the MCBs for all the RCD-protected circuits
except for a small ring in the converted loft room, then unplugged
everything else from that ring and tested from there.

Unless they are double pole MCBs it won't help if the problem is in the
wiring. The RCD will trip with a neutral to earth fault.

--
*The early bird gets the worm, but the second mouse gets the cheese *

Dave Plowman London SW
To e-mail, change noise into sound.