2000-P03132 - addn/remodel/repair

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• . 310.9.1 Smoke detectors. • 310.9.1.1 General. Dwelling units, congregate residences and hotel or lodging house guest rooms that are used for sleeping pur- poses shall be provided with smoke detectors. Detectors shall be installed in accordance with the approved manufacturer's instruc- tions. � 310.9.1.2 Additions, alterations or repairs to Group R Occu- pancies. When the valuation of an addition,alteration or repair to a Group R Occupancy exceeds $1,000 and a permit is required, or when one or more sleeping rooms are added or created in existina Group R Occupancies,smoke detectors shall be installed in accor- dance with Sections 310.9.13,310.9.1.4 and 310.9.1.5 of this sec- tion. EXCEPTIOY: Repairs to the exterior surfaces of a Group R Occu- pancy are exempt from the requuements of this section. 310.9.1.3 Power source. In new construction, required smoke detectors shall receive their primary power from the building wir- ing when such wirino is served from a commercial source and shall be equipped with a battery backup.The detector shall emit a signal when the batteries are low Wiring shall be permanent and without a disconnecting switch other than those required for overcurrent pro- tection. Smoke detectors may be solely battery operated when in- stalled in existing buildings; or in buildings without commercial power; or in buildings which undergo alterations,repairs or addi- tions regulated by Section 310.9.1.2. , 310.9.1.4 Location within dwelling units. In dwelling units, a detector shall be installed in each sleeping room and at a point cen- trally located in the corridor or area giving access to each separate sleepino area.When the dwelling unit has more than one story and � in dwellings with basements, a detector shall be installed on each story and in the basement.In dwelling units where a story or base- ment is split into two or more levels, the smoke detector shall be installed on the upper level,except that when the lower level con- tains a sleeping area, a detector shall be installed on each level. When sleeping rooms are on an upper level, the detector shall be placed at the ceiling of the upper level in close proximity to the stairway.In dwelline units where the ceiling height of a room open � to the hallway serving the bedrooms exceeds that of the hallway by 24 inches(610 mm)or more,smoke detectors shall be installed in the hallway and in the adjacent room. Detectors shall sound an alarm audible in all sleeping areas of the dwelling unit in which they are located. -a..