The ring main unit, also called the distribution board or distribution box, is where the power is distributed from the fuse box to various outlets and appliances in the building. It typically contains a number of switch sockets, light switches, and other electrical connections. It stripped away the jargon and gave us a “Golden Rule” for identifying these boxes instantly. And all the switching and protective devices are installed in the. The fuse box, also known as the consumer unit, is the central control point of the ring main circuit. Whether in a home or an industrial facility, this box keeps your electrical setup organized, functional, and efficient.