It's never a good idea to have an RCD incommer, as a single fault will leave the entire installation with no power.
thanks, you got me thinking now.
I have often pondered the pros and cons of this, and I think I would prefer the total safety of everything rcd protected and risk full blackouts rather than any of my family being on the receiving end of a live fault that doesn't disconnect.
I expect it would be expensive, but is there any reason why you couldnt fit a rccd or rcbo on each circuit to keep the protection level while not risking total loss?