Ring Main Unit Connection Diagram

Advantages of ring main units.

Ring main unit connection diagram. Front view and single line diagram figure 4. Ring main circuit starts from the consumer unit connects to a number of electrical devices typically sockets and then returns to the consumer unit. Wiring a socket correctly in a final ring circuit or ring main. It goes around the house or a room and connects to all the sockets and fused connection units fcu s required to be on the ring main circuit.

This incomer feeder is given with the provision of bushing protruding from the enclosure of rmu for supply cable connection. In the exam you may have to interpret a diagram of the ring main similar to this one. These units allow the connection of transformers through under ground cables and also provide protection to the transformers. A ring main unit rmu is a totally sealed gas insulated compact switchgear unit.

Electrical current can flow from either end of the ring. Functions such as connection supply and protection of mv equipment for different applications. Ring main unit comprises of one incomer feeder and one or more outgoing feeder. The wiring in a house connects all appliances together in parallel.

The incomer feeder is either vacuum circuit breaker or sf 6 circuit breaker with associated disconnect switch and earth switch. Ring main unit rmu manufacturers and suppliers in china orecco distribution with power systems as an important part of secondary tg 6644 there are several advantages to the use a dw 3456 electrical diagram m19 compact for network stations elatec tz 1241 circuit free ring main unit rmu manufacturers and suppliers in china orecco ring main distribution with read more. The switches for the connection unit are typically double pole meaning it switches both live and neutral at the same time. The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers.

They are not so common in the uk but are used extensively abroad as the ring main or final ring circuit does have it s drawbacks. Ring circuits are commonly used in british wiring with socket outlets taking fused plugs to bs 1363 because the breaker rating is much higher than that of any. 17 5 kv 2 ring switches up to 630a 2 vacuum. Different combinations of these primary switching devices within the unit are commonly used.

The ring starts at the consumer unit also known as fuse box distribution board or breaker box visits each socket in turn and then returns to the consumer unit. The ring is fed from a fuse or circuit breaker in the consumer unit. 17 5 kv 2 ring switches up to 630a 2 vacuum circuit breakers up to 630a. Ring main units are available in different voltage ratings ranging from 11kv to 33kv.

The major advantage of ring main units is the safety they provide to the operators.