Radial Circuit Vs Ring Main

In this topology one ring network of distributors is fed by more than one feeder.

Radial circuit vs ring main. In practice meeting this requirement is rarely an issue. Ring main electrical power distribution system. In this case if one feeder is under fault or maintenance the ring. 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 2 5mm in size.

In a radial circuit power is transmitted from point to point by a single length of cable linking each point to the next. 08 march 2005 radials all the way much easier to test afterwards. Cable rating for cables used in a ring main must be no less than two thirds of the rating of the ring main s protective device. Can anyone give me advantages and disadvantages of a ring main rather than a radial circuit.

During break or disconnect the ring circuit is vulnerable in ground protection. 18 february 2007 12 09 pm pullen posts. The theory much argued at the time was that less materials copper were used by running a ring around a room or rooms than running a long radial or radials around the room s due to the reduced conductor csa that could be safely used. It starts at the main fuse box and terminates at the last connected device.

A ring main circuit installation and testing is more rigorous than radial circuit. Or are radial circuits the way to go in domestic wiring. On a historical note ring final circuits were introduced in 1947 in the uk to save on materials in post war reconstruction. 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 kingdom this design enables the use of smaller diameter wire than would be used in a radial circuit of equivalent total current.