Run just one feed of 2.5mm cable to the consumer unit from the attic and connect it to terminal 4 on the Rcd side with a 20Amp breaker ...you don't need a ring main .So thisbis what i need? I know i need to run 2 cables for a ring right also?
Or do iuse that 20a breaker? Ive no idea as someone said id need the 30 but some sayin 30.