according to the on site guide - 32A MCB = 7.5kW= 6mm (approx)
40 a mcb = 10 mm = 9kw
50 A mcb = 10mm (or 16mm) = 10.5 kW
Ratings dependant on installation conditions- better to have it checked out.
Best to use 10mm as shower can be upgraded to a bigger size at a later date if wished.
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