T
Toneyz
Is the earthing to the lighting circuit non-existent or not correct? The approach should be persuade the customer remedial action is required if the customer cannot accept the cost or disruption a risk assessment needs to be carried out namely no metal fittings (lights switches etc) and back boxes should be plastic or the lugs made plastic.But I'm sure you can not change a fuse board if earthing not correct. It defeats the object. If an inspector asks you to carry out an RCD trip test, you are in trouble
As for the RCD you do not need a earth for it to operate.