Yes, for resistive loads such as heating elements can treat as if D.C. so :
9,500w divided by 230v = 41.30Amps therefore nearest fuse fuse size available 45A, this will require a 10 mm cable if 'enclosed in an insulated wall' ie chased in flush , or possibly a 6mm cable rated @46A if 'clipped direct' ie on surface depending upon lenght of run from con.unit.
for 6mm cable volt drop is 7.3 mV per amp per meter, so at say 20 meter run this would be:
7.3 X 41.3 X 20 =60.298 divided by 1000 to change to Volts=6.029 volts dropped which is within max allowed of 9.6volts
Ooops, for clipped direct (ie surface run) from table 4D5A, 4mm current rating is 37A if PVC cable.
So either cable is bigger than 4mm or your fuse is already too large....
the max size shower you could have on a 4mm is 8.5 kW assuming a short run to fuse box, ie less than abt 20 meters, regards Sparx