I am hoping to install a dual fuel range cooker that needs a 30amp connection. We have a gas Aga with electric fan at the moment which appears to be plugged into a 'normal socket' not one with an isolation switch. The fuse for the kitchen ring in the fusebox says 30amp - does that mean that is the total amperage on the circuit, and so do I need to get a separate 30amp supply just for an electric cooker?