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1. Oxford Dictionary

   ring main

   英式

   • n.
     an electrical supply serving a series of consumers and returning to the original source, so that each consumer has an alternative path in the event of a failure.；another term for ring circuit

   • noun: ring main, plural noun: ring mains

2. • 釋義

   n.

   名詞

   • 1. an electrical supply serving a series of consumers and returning to the original source, so that each consumer has an alternative path in the event of a failure.
   • ▪ another term for ring circuit
   • 2. an arrangement of pipes forming a closed loop into which steam, water, or sewage may be fed and whose points of draw-off are supplied by flow from two directions.