Hi all. I've just bought a 10.5kw shower to replace my old 9.5kw that is on its last legs. The current cabling installed for the old shower is 6mm with a 32A MCB, both of which I know have to be upgraded. I live in a top-floor flat and the cabling runs out of the consumer unit through about half a metre of conduit trunking (bunched with other wiring) until it reaches the attic space where it's then just surface clipped for about 10 metres until it gets to the pull-cord isolator switch on the bathroom ceiling. There is then another 2 - 3 metres of cable from the switch through the attic space to the shower unit itself, with the last half a metre inside conduit trunking down the bathroom wall.
Based on this layout, should the wiring be replaced with 10mm or 16mm cabling? (the shower's instruction booklet has said the MCB has to be upgraded to a 45A but all it says about the wiring is that it should be at least 10mm "depending upon circumstances" - but I don't want to spend more on cabling than I have to.)
Based on this layout, should the wiring be replaced with 10mm or 16mm cabling? (the shower's instruction booklet has said the MCB has to be upgraded to a 45A but all it says about the wiring is that it should be at least 10mm "depending upon circumstances" - but I don't want to spend more on cabling than I have to.)