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903.2 Where required. Approved automatic sprinkler systems in buildings and <br />structures shall be provided when one of the following conditions exists: <br />1. New buildings: Notwithstanding any applicable provisions of <br />Sections 903.2.1 through 903.2.19, an automatic fire - extinguishing <br />system shall also be installed in all occupancies when the total building <br />area exceeds 5,000 square feet (465 m2) as defined in Section 202, <br />regardless of fire areas or allowable area, or is more than two stories in <br />height. <br />2. Existing Buildings: Notwithstanding any applicable provisions of <br />1 this code, an automatic sprinkler system shall be provided in an existing <br />building when an addition occurs and one of the following conditions <br />exists: <br />a. When an addition is 33% or more of the existing building area, and <br />the resulting building area exceeds 5000 square feet (465 m2) as <br />defined in Section 202; or <br />b. When an addition exceeds 2000 square feet (186 m2) and the <br />resulting building area exceeds 5000 square feet (465 m2) as <br />defined in Section 202; or <br />c. An additional story is added above the second floor regardless of <br />fire areas or allowable area. <br />Exception: Group R -3 occupancies shall comply with Section 903.2.8. <br />(b) Section 903.2.8 Group R is hereby revised as follows: <br />903.2.8 Group R. An automatic sprinkler system installed in accordance with <br />Section 903.3 shall be provided throughout all buildings with a Group R fire area <br />as follows: <br />1. New Buildings: An automatic sprinkler system shall be installed <br />throughout all new buildings. <br />1(c) Section 903.3.5.3 Hydraulically calculated systems is hereby added as follows: <br />! 903.3.5.3 Hydraulically calculated systems. The design of hydraulically <br />calculated fire sprinkler systems shall not exceed 90% of the water supply <br />capacity <br />Exception: When static pressure exceeds 100 psi, and required by the Fire <br />Code Official, the fire sprinkler system shall not exceed water supply capacity <br />specified by Table 903.3.5.3 <br />Ordinance No. NS -2851 <br />Page 46 of 67 <br />