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In a building having a top floor which is more than 275 feet above grade, individual zones, as required by this Code, shall be supplied by two or more separate risers from the zone fire pump located in the lowest story of the building, known as an express riser, except that the number of express risers shall not exceed the number of risers serving that zone; or by individual fire pumps located on the lowest floor of each zone taking suction under head from a tank automatically filled by two or more risers from the adjacent lower zone. Such a tank shall have a capacity sufficient to supply the largest pump in the zone at its rated capacity for at least 30 minutes but not less than 10,000 gallons.
(Prior code § 91-82; Amend Coun. J. 10-30-96, p. 31261, § 1)