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a. When an addition is 33% or more of the existing building area, and the <br />resulting building area exceeds 5000 square feet (465 m2) as defined in <br />Section 202; or <br />b. When an addition exceeds 2000 square feet (186 m2) and the resulting <br />building area exceeds 5000 square feet (465 m2) as defined in Section <br />202; or <br />c. An additional story is added above the second floor regardless of fire <br />areas or allowable area. <br />Exception: Group R-3 occupancies shall comply with Section 903.2.8. <br />(b) 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 capacity <br />Exception: When static pressure exceeds 100 psi, and required by the Fire Code <br />Official, the fire sprinkler system shall not exceed water supply capacity specified by <br />Table 903.3.5.3 <br />Design <br />t <br />TABLE 903.3.5.3 <br />HYDRAULICALLY CALCULATED SYSTEMS <br />100 110 120 130 140 150 PSI <br />Ordinance No. NS-XXXX <br />11 B-1 7 Page 17 of 29 <br />