Hello All. My electric shower has stopped working (10.5 kW). Had a look at the CU, MCB for the shower circuit is rated at 32A and the cable is 6mm. The cable run from the CU to the pull cord isolator is 6 meters max out of which 2 meters is in a plastic conduit behind plaster (in the bathroom) the rest is under the floor board and loft. I want to replace my shower 10.8 kW, upgrade cable to 10mm, upgrade MCB to 45A. The CU in place at the moment is a MK sentry 7 way, the main isolator is rated at 63A. The main fuse is sealed, not sure what the rating is but on the fuse carrier it reads 'AEI series 3-100'. My question is can I use a 45A MCB with a 63A main isolator or do i need to upgrade the main isolator to say 80A?
Many thanks
Many thanks