To fix this you need not to have an RCD seeing the combined leakage
current, i.e. get rid of the RCD incomer. Alternatively you may be able
to swap it for an RCD with a higher trip current to avoid nuisance
trips (100mA).


I did half come to this conclusion a few weeks ago but have managed to
soldier on since - are 100ma RCDs commonly used/easy to obtain? - all i
have found are 30ma versions.