Current fusebox has several fuseways each feeding a meter then a 2 way fusebox which powers each rented room. Plan is a new CU & new secondary 2 way CUs, the meters will be retained. The question is how may RCD protection be implemented. If done in the main CU with an RCBO, a trip results in a room losing all power including lighting. If done in the secondary small CU, the cable from main CU to meter to secondary would not be RCD protected. This wiring is surface clipped direct. Neither of those options strike me as fully satisfactory. How's good to do this?


NT