mcb size

[newhousemadness]

I have just fitted a 10.5 shower and the trip keeps on tripping the fuse is only a 30a so I know I prob need to replace could anyone please tell me the size fuse I need.

Thanks
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moderator

please note 20 your post has been split

 

[nabby68]

10500w divided by 230 = 45.65amps

so you need a 50amp mcb and you will possibly have to change the exsisting wiring depending on what size cable goes to your shower and what route the cable takes.

i would suggest 10mm cable if you do not already have this

 

[steve_jones75]

Although the 10.5kW is no doubt rated at 240V, I always put in a 45A myself. I take it you have rewirable fuses?
It also sounds like you have uprated an existing shower, you really should have 10mm/4mm Twin & Earth cable.

Steve