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The current draw will be just over 40 amps at 230 volts so the mcb just might trip if the shower is on for extended periods although I doubt it. (do you have any teenagers in the house? !)
Keeping this in view, what FUSE do I need for a 9.5 kW shower?
Check the current fuse – This is a bit easy since you already have an idea of what fuse is used for your shower. It helps a lot when you only need to replace or get a backup fuse for your existing electrical shower.
The Right Fuse for Your Electrical Shower.
| Kilowatt Rating | Fuse Size |
|---|---|
| 9.5 kW | 40 amperes |
| 9.8 kW | 45 amperes |
| 10.8 kW | 45 amperes |
Herein, what size RCD for 9.5 kW shower?
9.5kW is either 39A or 41A depending on the voltage it is rated at. 6mm cable is 47A when installed in the most favourable conditions. So 6mm could be used, depending on how it is installed. However it would be usual to use 10mm which would allow the fitting of a higher rated shower either now or in the future.
you may find that a shower heater rated at 10.5kW draws less current that what is calculated. I recently reviewed two Mira 10.5 units that both drew 42 amps running flat out. It is quite possible, that with a 45A or 50A protective device and favourable cable installation method, 6mm T&E will suffice.