In electricity supply design, a ring final circuit or ring circuit (often incorrectly called a ring main, a term used historically,[1] or informally a ring) is an electrical wiring technique developed and primarily used in the United Kingdom, and to a lesser extent in Ireland and Hong Kong. This design enables the use of smaller-diameter wire than would be used in a radial circuit of equivalent total current. The reduced diameter conductors in the flexible cords connecting an appliance to the plug intended for use with sockets on a ring circuit are individually protected by a fuse in the plug. Its advantages over radial circuits are therefore reduced quantity of copper used, and greater flexibility of appliances and equipment that can be connected.
Ideally, the ring circuit acts like two radial circuits proceeding in opposite directions around the ring, the dividing point between them dependent on the distribution of load in the ring. If the load is evenly split across the two directions, the current in each direction is half of the total, allowing the use of wire with half the total current-carrying capacity. In practice, the load does not always split evenly, so thicker wire is used.
https://en.wikipedia.org/wiki/Ring_circuit
No comments:
Post a Comment