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Thanks for the quick response and tips guys. But are you sure that the 45amp mcb (WYB45) plug in type for Wylex standard C.U.s, will fit my existing old Wylex NN c.u.? I prefer to go down this route if poss, than fit a new CU.

Hi! All, :( Im upgrading to a 10.8kw electric shower.Ive replaced the old 6mm cable run for 10mm and fit a 45amp ceiling switch replacing the old 30amp.And am now at the C.U.stage.The existing C.U.is a WYLEX cat.No NN614 (about 20yrs old)with WYLEX MCBs TYPE2.Of which 1 30amp was dedicated to...