Ring Main Unit Circuit Diagram

What is a ring main or ring final circuit or final circuit.

Ring main unit circuit diagram. It gets the power from the consumer unit and delivers it to the sockets. 7 vacuum circuit breaker 8 ring switch cable. 17 5 kv 2 ring switches up to 630 a 1 vacuum circuit breaker up to 630a. This incomer feeder is given with the provision of bushing protruding from the enclosure of rmu for supply cable connection.

Front view and single line diagram figure 2. It is a ring of cables usually 2 5mm carrying twin and earth wires circling your home carrying the mains electricity to sockets on the way. Ring main unit comprises of one incomer feeder and one or more outgoing feeder. Front view and single line diagram.

As you can see it eliminates the need to wire a socket all the way back to the a consumer unit but the nearest ring main socket is used instead. Its simplicity makes it a great arrangement for that use. The incomer feeder is either vacuum circuit breaker or sf 6 circuit breaker with associated disconnect switch and earth switch. 17 5 kv 2 ring switches up to 630a 1 vacuum circuit breaker up to 630a.

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