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� ` ' 310.9.1 Smolce detectors. 310.9.I.I General.Dwelling units,�congregate residences and hotel or Iodging house guest rooms that are used for sleeping puzposes shall be provided with smolce.detectors.Detectors sha]1 be installed i.n accordance�vith the approved manufacturer's instzuctions. 310.9.1.2 Additions, alterations or repairs to Group R Occupancies.When the valuation of an addition,alteration or repair to a Group R Occupancy exceeds $I,000 and a pennic is required, or tivhen oneor more sleeping rooms are added or created in existing Group R Occupancies, smoke detectorsshall be installed in accordance tivith Sections 310.9.I.3, 3I0.9.I.4 and 310.9.1.5 of this section. � EXCEPTION:Repa�ss'to the exterior surfaces of a Group R�Occupancy are exempt from the require- ments of this sectiori. 310.9.1.3 Potiver source. Ln new construction, required smolce detectozs shall receive their pri- mary power fzom the building wiring when such tiviring is served fxom a commercial source and shall be equipped with a battery bacicup.The detector shall emit a signal when the batteries are Iow. tiYiring shall be permanent and without a disconnecting switch other than those required for over- current pzotection. Smolce detectozs may be solely battery operated when installed in existing build.ings; or in builclings tivithout commercial power; or in buildings�vhich undergo alterations, ,repairs or additions regulated by Section 310.9.1.2. 3I0.9.1.4 Location within dwelling units. Iz►dwelling units, a detectoz shall be installed in each sleeping room and at a point centcally located in the corridor or area giving access to each separate sleeping area.When the dwelling unit has more than one story and in d�vellings with basements, a detectoz ahall be installed on each story and in the basemenG Xn d�velling units tivhere a story or base- ment is split into two or more levels, the smolce detector shall be installed on the upper level, except that�vhen the lotivez level contaiuns 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 iun close proximity to the stairway, xn dwelling units tivhere the ceiling height o£a room operi to the halhvay serviung the bedrooms exceeds that of the hallway by 24 inches (610 mm) or more, smoke detectors shall be i�zistaIIed in the halltivay and i,n the adjacent room. Detectors shall sound an alarm audible in all sleeping areas of the d�velling unit in which they are located.