In practice meeting this requirement is rarely an issue. Although in almost all situations certainly domestically 25mm twin and earth will be the wiring choice to go for for sockets circuits the size of cable will be in some ways be dictated by the size of mcb in the consumer unit that the circuit will run from.
Home Electrics Ring Circuit
Ring final circuit wiring diagram. Tests for ring final circuits duration. Within the electrical industry the ring main circuit sometimes ring main or ring final circuit is an electrical wiring technique that is most commonly used in the uk. This is exactly the same as connecting at the end of a radial circuit. Shortly after world war ii there was a considerable demand for building materials. The ring circuit is made up of two radial circuits connected to the same series of accessories within the circuit. They are generally wired with 25 mm2 cable and protected by a 30 a fuse an older 30 a circuit breaker or a european harmonised 32 a circuit breaker.
25mm twin core and earth wiring for use with socket wiring. Part 1 dc circuits duration. Usually the protective devices used on a ring main will be a 30 a fuse 30 a breaker or 32 a breaker and the cables are usually 25mm in size. Both brown wires connect to the live or l terminal. Ring socket wiring ring socket circuit. As described previously a ring circuit starts at the consumer unit connects to each socket outlet in turn and then returns to the consumer unit.
Cable rating for cables used in a ring main must be no less than two thirds of the rating of the ring mains protective device. All of the socket outlets will have two cables. Ring circuit wiring offered a more efficient and lower cost system which would safely support a greater number of sockets. A ring final circuit or ring circuit informally also ring main or just ring is a wiring technique developed and used in the uk that uses two conductors for each of live neutral and earth to supply each connected socket or other load. Essential practical circuit analysis. In electricity supply design a ring final circuit or ring circuit often incorrectly called a ring main a term used historically or informally a ring is an electrical wiring technique developed and primarily used in the united kingdomthis design enables the use of smaller diameter wire than would be used in a radial circuit of equivalent total current.
In the diagram here in and out are the existing ring cables and spur is the new cable leading to the new socket outlet. This design reduces the consequences of faults and enables the use of smaller diameter wire than would be used in a radial circuit of equivalent ampacity. Ring circuits as used in the uk for socket outlets. Wiring is the same as for the radial circuit. The other end of the cable connects to a socket on the ring so there will be three cables in that socket. The lower costs aspect was related to fact that wires with a smaller diameter could be used compared to radial wiring.
Gallery of Ring Final Circuit Wiring Diagram
