Definition of ring main in US English:

ring main


  • 1An 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.

    • ‘He said the new machine would bring significant advantages to people living close to the ring main which circles the city.’
    • ‘Backbones and ring mains are laid around cities as other infrastructure is buried.’
    • ‘Contractors are working round the ring mains, which vaguely follows the Bradford Ring Road, in an anti-clockwise direction.’
    • ‘Consumers will benefit from the new gas ring main linking Galway and Limerick to the grid while the Government has decided to extend the gas network to the north west.’
    1. 1.1
      another term for ring circuit
      • ‘My father and I spent the best part of one day fitting outside taps for the garden and working under the floorboards fitting additional sockets into the ring main.’
  • 2An 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.

    • ‘The Trust installed a ring main and new water tanks at a cost of £100,000.’
    • ‘The workers are cleaning Bradford's ring mains water pipes at the rate of about 1km per week.’
    • ‘Mr Thompson added: ‘We'll be working on the ring main, a large diameter pipe which runs around the outskirts of the city and feeds the smaller pipes taking water to customers homes.’’
    • ‘Once outside the new ring main 35 to 40 percent of treated water is lost in leakage.’
    • ‘Work on the Channel Tunnel itself, on the ring main for London's water, and on the Jubilee Line extension, happened out of sight.’
    • ‘The average cost of the road is expected to be in the region of £750,000 per km of the 3.9km road, with an additional £800,000 for a new river crossing and £350,000 foul water ring main (drainage).’


ring main

/ˈrɪŋ ˌmeɪn//ˈriNG ˌmān/