New shower...correct MCB?

[twinbeech]

I've installed a Mira 9.0kw shower. 10mm cable running under the floor back to the CU. It currently has a 32amp MCB on the RCD side, but I need a 40amp. Can I just swap this over with a single pole 40amp type B?

 

[GaryMo]

Yes, assuming your 10mm cable doesn't pass through any thermal insulation which would reduce its current carrying capacity.

 

[twinbeech]

The cable just runs directly up into the loft, over to the pull switch in the bathroom, and then from there, it's tacked inside a stud wall support down to under the floor boards to just above the CU, and it's currently hanging into the sitting room waiting to be connected up.

The CU is a Memera 2000 (pt 13??) Other than that I know it's about 8 yrs old.

 

[twinbeech]

Before going near the CU, is it legal to do so? I've heard there could be a big fine for attempting the work yourself. If you do and then sell your house there'd be no certificate to show it was safe either...any thoughts?

 

[sealeon]

As it is a new circuit it should to notified to them higher powers if you do put it in the board its good practice to have the higher rated mcb s closest to the main switch or in your case RCD

 

[ricicle]

And make sure the RCD is of the 30mA flavour

 

[securespark]

Hmm. What does 30mA taste like?

 

[Vicario]

When you say 9kw, do you mean the 9.8 model?

 

[twinbeech]

The Mira comes in two types, this one anyway, and ours is the 9Kw not the 9.8. Any other ideas on the legalities of wiring it in yourself?

 

[sealeon]

You should tell the building control at the council to be legal before the work starts as its a new circuit and its in a special location eg bathroom

 

[ban-all-sheds]

Any other ideas on the legalities of wiring it in yourself?

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