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<br />Ordinance No. NS-XXX <br />Page 4 of 26 <br />square feet as defined in Section 202, regardless of fire areas or allowable <br />area, or is more than two stories in height. <br />Exception: Subject to approval by the Fire Code Official, open parking <br />garages in accordance with Section 406.5 of the California Building Code <br />that are smaller than the area specified in section 903.2.10 (3) or <br />903.2.10.1 of the California Fire Code. <br />2. Existing Buildings: Notwithstanding any applicable provisions of this <br />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 />2.1. When an addition is 33% or more of the existing building area, and <br />the resulting building area exceeds 5000 square feet. <br />2.2. When an addition exceeds 2000 square feet, and the resulting <br />building area exceeds 5000 square feet. <br />2.3. An additional story is added above the second floor regardless of fire <br />areas or allowable area. <br />Exception: Additions to Group R-3 occupancies shall comply with Section <br />903.2.8. <br /> <br />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 sprinkler systems shall not exceed 90% of the water supply capacity. <br />Exception: When static pressure exceeds 100 psi, and when required by the <br />fire code official, the sprinkler system shall not exceed the water supply <br />capacity specified by Table 903.3.5.3. <br /> <br /> <br /> <br />90 100 110 120 130 140 150 PSI <br />85 <br />80 <br />75 <br />Design % <br />TABLE 903.3.5.3 <br />Hydraulically Calculated Systems <br />