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8. In Group F, Division 2 Occupancies used for retain sales when the occupancy is over twelve thousand square feet (12,000 sq. ft.) in a single floor area or more than two stories in height; however, the respective increases for area and height set forth in Sections 506 and 507 shall be permitted. (c) Detailed Requirements. Automatic fire-extinguishing systems shall be installed in accordance with Section 3801(d). EXCEPTIONS: 1. Automatic fire-extinguishing systems shall have at least one automatic water supply of adequate pressure, capacity and reliability. 2. Automatic fire-sprinkling systems may be connected to the domestic water supply main when approved by the Building Official provided the domestic water supply is of adequate pressure, capacity and sizing for the combined domestic and fire sprinkler requirements. In such case, the fire-sprinkler system connection shall be made between the public water main or meter and the building shutoff valve and there shall not be intervening valves or connections. The fire department connec- tion may be omitted when approved by the Fire Department. 3. The sprinkler alarm valve for an automatic fire-sprin- kling system may be omitted when the sprinkler system serves less than six heads or where the system is connected to an approved fire alarm system. Dry Standpipes Sec. 3803. (a) General. Dry standpipes shall comply with the requirements of this Section. (b) Where Required. Ail buildings, four or more stories in height, shall be equipped with one or more dry standpipes. (c) Location. There shall be one dry standpipe outlet connection located at every floor level landing of every re- quired enclosed stairway or smokeproof enclosure. No point within a building requiring dry standpipes shall be more than one hundred and thirty feet (130') travel distance from a dry standpipe outlet connection. Portions of dry standpipe systems not located within an en- closed stairway or smokeproof enclosure shall be protected by a degree of fire resistance equal to that required for vertical enclosures in the building in which they are located. (d) Detailed Requirements. 1. Construction. Fittings and connections shall be of sufficient strength to withstand 300 pounds per square inch of water pressure when ready for service. All dry standpipes shall be tested hydrostatically to withstand not less than 300 pounds per square inch of pressure for two hours, but in no case shall the pressure be less than 50 pounds per square inch above the maximum working pressure. 2. Piping. Ail horizontal runs of dry standpipe systems shall be pitched at the rate of one-fourth inch (1/4") to ten feet (10') for purposes of draining. Where pipe traps occur in such standpipe systems including fire department connections, they shall be provided with drains. 3. Size. The size of the standpipe shall be not less than four inches (4") in buildings in which the highest outlet is seventy-five feet (75') or less above the fire department con- nection and shall be not less than six inches (6") where the highest outlet is higher than seventy-five feet (75') above the fire department connection. -6-