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1305.9.4 Drain at Base of Shafts; Leak Detection
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A drain pipe shall be installed at the base of shafts enclosing the supply and overflow/return piping. The pipe shall lead to a dedicated sump or minimum 55-gallon (208 L) container with a leak detection alarm, arranged so as to sound an alarm and stop the transfer pump. The alarm shall be connected to a local audible alarm and to a remote alarm located at a supervising station. The wiring shall comply with the New York City Electrical Code.