I'm fitting a new shower in a house which currently only has old replacable fuses in its consumer unit. The wireing is fine (10mm) but I am not happy about just using the current fuse on the consumer unit so i have decided to wire in a separate unit with a 63A RCD and 50A MCB between the consumer unit and the shower. I was just wondering whether the best way to wire into the consumer unit is into the back of the existing fuse position and replace the fuse carrier without the fuse wire. Or is there a better way to do it - thanks in advance.