I want to run a new radial circuit length 21m to 8 double sockets. It's for 2 bedrooms, with computers etc.
Will 4mm cable be OK?
Part will be fixed to a joist, part buried in plaster, part in a groove in kingspan behind OSB.
Also a similar radial to one storage heater: will 2.5mm do for that.
I've got the red 17th edition On Site Guide, on page 48 Cable size mm
4.0/1.5 is the 1.5 the area of the earth wire? [george]