Ring Main Unit Diagram. The load break switch is nothing but an isolator having the capability of breaking the circuit during on load condition. The ring is fed from a fuse or circuit breaker in the consumer unit.
The mains supply the wiring in a house connects all. Ring main unit is a compact gas insulated switchgear cubicle equipped with sf6 switch disconnector and sf6 circuit breakers. 2 such rings is typical for a 2 up 2 down larger houses have more.
Ringmainunitoperations of ring main unit with sld procedure of shutdown processoperation of load break switchoperation of circuit breakeroperation of isola.
An example of distribution network with ring main units combinations of rmu units by schneider electric in case a circuit breaker is the switching device it is also equipped with protective relaying either with a very basic self powered type or a more advanced one with communication capabilities. A ring final circuitor ring circuitinformally also ring mainor 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. A typical ring main unit is shown in figure below. A split load cu.