10.5kw shower wired in 10mm twin n earth on a 40A breaker a problem

[giddash]

Hi there,
I did wired 10.5kw shower with a 10mm cable on a 40A breaker for an old lady's bathroom.she recently got a builder in to do some tiling work and this guy thinks the wiring is wrong and that i should have use 45A breaker else the house will catch fire.I don't think his is right as there no way this could happen as I did test the breaker and it tripped in less than 5s but tought i should post this any way.

 

[davesparks]

No it's for better water delivery these can pump 8 liters per minute

No they don't, these showers don't have any kind of pump in them, they operate purely on mains pressure.

 

[HappyHippyDad]

I can't believe no one jumped down the OP's throat. He's gone now so it won't offend him to say 'what a scary post!'

 

[littlespark]

I can't believe no one jumped down the OP's throat. He's gone now so it won't offend him to say 'what a scary post!'

I think someone did on page 1..... something about a DI not having a clue...

It’s probably ok for the time the shower is running, but over time the breaker will get tired