I am providing power to a small ouitbuilding 6 metres from the existing house and existing consumer unit. I am intending to provide a sub circuit via a new 2way consumer unit. The supply will come from a spare mcb in the existing unit. As i understand it the wiring regs require the new con unit to be seperately earthed. The earth wire from the existing consumer unit will not therefore be connected to the new consumer unit but a seperate earth cable and earth rod will be used. The new con unit is rcd protected. Is this the correct/best way to provide this power to the outbuilding? If the supply cable earth core is connected to the earth in the old consumer unit do I need to terminate this in any specific way wherer it reaches the new con unit as it will not be connected?