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So if the Barn or outhouse develop an earth fault and you are relying on the CU RCD in the house then all the house goes out with the outside buildings if I am understanding this correctly?
It's a split load board and I agree, it's not ideal... but the cable is T+E and it runs an unknown route through the house, so to be sure it complies, it really should be RCD protected at the origin.
I could convert the board to include a non-RCD protected section and put the barn supply on an RCBO, but that just gives me the chills.
Rock and a hard place is my view.