Ring Main 1
Ring Main 1 : (1) (Elect). A main closed upon itself or by bringing the ends to a common busbar, and in which the direction of flow of energy at some point depends on the distribution of load. (MF 6B). (2) (Hydr). A water main which encircles a building, series of buildings or other associated fire risks, and which feed hydrants, internal rising mains, sprinklers, etc. It is supplied with water, usually from one or more street mains
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