connection for shower cabin

[ggman]

I am thinking of installing a steam cabin which requires a 16 amp supply.
Power connection, Inside my airing cupboard, where once was installed the HW cylinder there is the old power outlet, the 4 mm wire comes from the consumer unit with a dedicated 16 amp MCB.
Can it be increased to a least 20 amps?
Can there be installed an insulated consumer unit like Mk sentry 4 way with the requested 16amp RCBO, 10 or 16 amps RCBO for a loft socket, and a 6amp RCBO for a light line.
Any comment to this project will be highly appreciated.
Thank you

 

[Mr Mark Sparks]

the short answer is yes
you can uprate to 20a and put a small cu on the end and take sub circuits from that,seems a bit ott but if its the easiest then its fine.

 

[ggman]

Fantastic!!!
Thank you very much

 

[malcolmsanford]

The only thing is if the supply is 4mm^ T+E and is buried in a stud wall to method 103 then your max current carrying capacity is only 17.5 amps so check that.

Can I ask why your are wanting to fit a 4 way board to 20amp (if possible) supply. It's not a good design having the 16amp steam cabinet, then a 13amp socket and a light on just a 20amp supply. But as the socket and the lights are in a loft you might get away with it.

 

[daniel hill]

hi there you should be fine to do this as t+E 4mm can carry 26A if through thermal insulation and 32A if clipped direct so you should be fine with this
just a small submain
http://www.tlc-direct.co.uk/Book/4.3.9.htm