RING MAIN UNITS (RMU’s).

Ring main unit is used in the secondary distribution system.  

It has three no of switches (CB or Isolation or load breakers unit) Two used as inputs with mechanical/electrical interlock and one output. In some cases it is used in a ring formation along with other units in the same ring, so as to have very little down- time of the remaining system in case of failure of a particular section.

RMU normally comes with LBS on both sides of the T and T has a CB which feeds the transformer.

They come in standard rating of 11/22/33KV, 630/1250A, 200A, 21KA/3sec.

RMU is compact, and relatively cheap.

 

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30L-7A

 

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Plot 7B, Acme Road, Ogba, Ikeja, lagos
Tel – 01- 7606161
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Mobile- 08088880011, 08030441100
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