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hi i have installed a ring main in my new kitchen 2.5 and wired it to the c/u by a 32amp, m.c.b to a r.c.d 80amp 30mil amp the new walls have been plastered on dot and dab p/board.the r.c.d. trips but when i wire on to a 16 amp m.c b not protected by an r.c.d it works fine a have 6 no s/u/let...