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b. When an addition exceeds 2000 square feet (186 m2) and <br />the resulting building area exceeds 5000 square feet (465 m2) <br />as defined in Section 202; or <br />c. An additional story is added above the second floor <br />regardless of fire areas or allowable area. <br />Exception: Group R-3 occupancies shall comply with Section <br />903.2.8. <br />(b) Section 903.3.5.3 Hydraulically calculated <br />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 <br />Fire Code Official, the fire sprinkler system shall not exceed water supply <br />capacity specified by Table 903.3.5. <br />Ordinance No. NS-2981 <br />Page 19 of 33 <br />