Two Radial Circuits - one mcb

[ebee]

Overload protection can be anywhere in the circuit, obviously you wouldn`t put it in the neutral conductor (but it would actually still provide correct overload protection on a single phase circuit). It`s the final circuit that counts so you might have 1/ your consumer unit fed by a 100A fuse, a circuit of 32A on the CU feeding two fused connection units (or a two way consumer unit) feeding two immersion heaters.
Then providing cable sizes are correct at each stage then it`s OK.
However by the time you`ve done all that it might be more prudent fit a tailblock and separate CU (say RCBO ) for your outside supply.
Whichever way you do it then it is still notifiable though.

 

[hereward]

Thanks everyone interesting to read all the slightly different opinions - having looked at all the replies my proposal whilst probably OK is after some thought
not a nice or elegant solution so back to extra dedicated CU for the outside supply (extra hassle with supply company and access to meter). Yep know it is notifiable. Thanks for the replies helps to clear thinking !