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Thx for the help guys. To summarise 10mm and a 50 A MCB is ok. Now for the other confusing bits - No I have never heard of a part P - what is it - do I need one and how do I fit it? Also concerned that I would need to upgrade the RCD. There is two ring mains on it. One 32A for kitchen...

Right I have only limited electrical knowledge but I need to find out the best way to go for the installation of a new shower. The Shower is a 10.8kW Firstly 10mm or 16mm cable? Walls are cardboard lattice type insulated. Secondly my 100A CU is a crabtree unit. The MCB should be 45A...