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i've just finished installing a shower(9.5kw), i have followed all the safety measures fitting a 45 amp mcb(consumer unit already fitted with rcd) 10mm cable 50amp double pole pull cord switch, all working fine and happy, but i would just querie the use of 10mm cable as the cable used inside the shower unit is only 6mm and 4mm, i dont undrstand using 10mm to then step down to 6mm on the shower. has anyone got any thoughts