Electric shower rating?

[preecy]

We're planning on renovating our bathroom and looking for new shower to replace an old 8.5kw shower. I haven't checked the cable size as yet but part of a protected group (80amp RCD) and is on its own B32 MCB. Can we go for a 9 or 10kw shower, assuming the cable size it adequate, or are we limited to 7.5-8.5kw showers? thanks in advance

 

[deadshort]

Depending on the cable length and installation method a 10k shower will require a 10mm cable and 45 mcb with RCD fitted. Check the Mira website for details.

Regards,

DS

 

[flameport]

With a 32A circuit, the maximum power will be 7.6kW assuming the shower is rated at 240V (most are).

 

[EFLImpudence]

Depending on the cable length and installation method a 10k shower will require a 10mm cable

No it won't - 6mm² is fine.

10/240 = 42A - less at 230V

6mm² can carry 47A (method C).

 

[deadshort]

Depending on the cable length and installation method a 10k shower will require a 10mm cable

No it won't - 6mm² is fine.

10/240 = 42A - less at 230V

6mm² can carry 47A (method C).

Ah, you know the insallation method used ?

DS

 

[EFLImpudence]

I don't follow.

Either way, what you wrote is not correct.

 

[preecy]

pretty sure the current shower is an old Mira 8.5kw model. are we saying its to heavy and the new replacement i intend to buy should only be 7.6kw?

 

[EFLImpudence]

Yes.

However, if someone can verify the size and installation method of the cable then you may be able to increase the rating of the MCB and have a 10.5kW shower.

 

[ban-all-sheds]

Depending on the cable length and installation method a 10k shower might require a 10mm cable and 45 mcb with RCD fitted. Check the Mira website for details.

Regards,

DS