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Definition of ring main noun from the Oxford Advanced Learner's Dictionary

ring main

noun
 
/ˈrɪŋ meɪn/
 
/ˈrɪŋ meɪn/
(specialist)
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  1. an arrangement of cables that allows electricity to be supplied to a series of places from either of two directions
  2. (also ring circuit)
    (specialist) an arrangement of wires that supply electricity to several different places in a room or building
  3. an arrangement of connected pipes that allows water, steam, etc. to enter and leave a system

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