Ring circuit

Common card · No. 467174

In electricity supply, a ring circuit is an electrical wiring topology in which power is distributed through a continuous cable ring. Each conductor of the ring is connected to the source of the supply at both of its ends. The topology contrasts with the typical radial circuit configuration, in which nodes and the distribution point at the protective device are connected in a line or a line with branches or legs off the main line. Ring circuits are used in distribution for power and lighting. Rings at the final consumer current draw off point either for power or lighting are known as a ring final circuit. Ring final circuits are often termed by the historical name ring main in the United Kingdom. Ring circuits are subject to typical cable protection relating for all types of circuit topologies, in which the cable is at a higher amperage loading than the protective device's (breaker) value. In the United Kingdom there is an anomalous ring final circuit with the cable at a lower amperage...

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