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945 Olney, Aumsville December 22, 1992 Page 2 guardrails shall have intermediate rails or an ornamental pattern such that an object 12 inch diameter cannot pass through where a stairway is not accessible to the public.). (lTl1) Rail spacing complying with OSHA standards are an acceptable alternate. A water supply sufficient to control a potential fire is required. Appendix III-A of the Uniform Fire Code. Contact the local fire department for requirements. The chief shall establish the minimum residual pressure and flow duration when determining fi~e flow. Portable fire extinguishers shall be provided and installed as required by applicable standards and as directed by the authority having jurisdiction. (U.F.C. 10.303; U.F.C. std. NO. 10~1) The plans for the required automatic sprinkler system are to be submitted to Marion County Building Inspection for plan review and approval prior to installation. The exterior building envelope, heating, ventilating, air conditioning and service water heating systems shall comply with Chapter 53, Energy Conservation. Submit certification of conformance by an Oregon registered architect or engineer. ($301(c)) Suspended ceiling systems shall be braced for lateral loads. Where substantiating design calculations are not provided, horizontal restraints shall be effected by four NO. 12 gage wires secured to the main runner within 2 inches of the cross runner intersection and splayed 90 degrees from each other at an angle not exceeding 45 degrees from the plane of the ceiling. A st~ut fastened to the main runner shall be extended to and fastened to the structural members supporting the roof or floor above. The strut shall be adequate to resist the vertical component induced by the tracing wires. These horizontal restraint points shall be placed 12 feet on center in both directions with the first point within 6 feet from each wall. Attachment of the restraint wires to the structure above shall be adequate for the load imposed. (UBC Std. 47-18 Sec. 47.1812(c)) only "intermediate" and "heavy duty" ceiling systems may be used for the support of lighting fixtures. Ail lighting fixtures shall be positively attached to the suspended ceiling system. The attachment device shall have a capacity of 100 percen~ of the lighting fixture weight acting in any direction. When "intermediate" systems are used, NO. 12 gage hangers shall be attached to the grid members within 3 inches of each corner of each fixture. Tandem fixtures may utilize come, on wires. Where "heavy duty" systems are used, supplemental hangers are not required if a 48-inch modular hanger pattern is followed. When cross runners are used without supplemental hangers to support lighting fixtures, these cross runners must provide the same carrying capacity as the main runner. Lighting fixtures weighing less than 56 pounds shall have, in addition to the requirements outlined above, two No. 12 gage hangers connected from the fiature housing to the structure above. These wires may be slack. Lighting fixtures weighing 56 pounds or more shall be supported directly from the structure above by approved hangers. (UBC Std. 47-18 Sec. 47.1813)