I would llike to run power to my childrens shed for a light and a sockett for a heater.At present there is power in the garagecoming from 2.5mm cable whichappears to come from the downstairs sockets,this runs into a consumer unit with RCD and 2 mcb's.Can I run another cablefrom this consumer unitto the shed into a switch box with 2 MCB'susing 2.5mm cable or do I need to run a totally separte supplyfrom the main consumer unitin the house with armoured cable.
please help