I want a cable run to an adjoining garage which is to be converted into a
utility room and study. The actual work will be carried out professionally,
but in order to feed the circuit from my existing consumer unit, I need to
try and get hold of the MCB myself, most likely second-hand.
I envisage either a 6mm T&E or a 10mm T&E being fed out there. I'm more
inclined to go for 10mm actually, just so as I know there will be plenty of
capacity. There will be a couple of computers out there - possibly also an
oil filled radiator in the conservatory, tumble dryer and iron, and also
whatever else is running in the garden.
In the converted garage, there will be a new, smaller consumer unit, to
split things up as the electrician sees fit. But what rating MCB should I be
looking for to fit the existing consumer unit?
I see that 6mm T&E has max load of 40A, whilst 10mm T&E has max load of 53A.
In those instances, would I be looking for MCBs of 32A and 50A respectively?
For my consumer unit (GE Series E), MCBs were made (once upon a time) in
32A, 40A, 53A and 60A.