<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> In an electrical power distribution system, a ring main unit (RMU) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring - type distribution network . It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch that feed a distribution transformer . The metal enclosed unit connects to the transformer either through a bus throat of standardized dimensions, or else through cables and is usually installed outdoors . Ring main cables enter and leave the cabinet . This type of switchgear is used for medium - voltage power distribution, from 7200 volts to about 36000 volts . </P> <P> The ring main unit was introduced in the United Kingdom and is now widely used in other countries . In North American distribution practice, often the equivalent of a ring main unit is built into a pad - mounted transformer which integrates switches and transformer into a single cabinet . </P>

What is ring main unit in electrical power distribution
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