The specifically designed back box ensures a neat and exact fit, funnel entrance to terminals enables positive cable connection and outboard rocker sockets are ideal for gloved hands. The terminal screws are backed out and captive terminals are upwards facing to make installation easier and clear terminal markings for easy identification. When servicing or repairing appliances fuse carriers on connection units can be padlocked for additional safety. A secret key-operated switch helps prevent unauthorised usage and it is manufactured according to BS EN 60669-1:1999 standards and earth terminal fitted in base of box.