I want to install a small shower toilet and sink in a small study. This room has a standard 13 amp socket. I planed to install a Macerator to take the waste away. The 13 amp socket is in zone two. Is ok to change the 13 AMP socket to a RCD Spur to power only the Macerator. thanks for your help have looked at the lay out and moveing things about I think i can get outside the 600 mm distance