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. � � . . • . 3I0.9.i Smolce detectors. 310.9.I.I General.l�we7ling units,�congxegate residences and hotel or Iodging house guest . rooms that are used for sleepi.ng purposes shall be provided with smolce decectors:Detectors shall be installed in accord.ance tivi.th the approved manufacturex's i.nstructions. � 310.9.1.2 Additions, alterations or repairs to Group R Occupancies.VYhen the valuation of an additzon,al.teration or xepaix to a Group R Occupancy exceeds �1,000 and a permit is xequired, or tiyhen oneor moxe sleeping rooms are added�or exeated in existing Group R Occupancies, smoke detectorsshall be installed in accordance�vith Sections 3I0.9.I.3, 3I0.9.]..4 and 3I0.9.I.5 of this sec#ion. �XCEP'�'70N: Repairs�to the exterior surfaces of a Group R�Occupancy are exempt from the require- znents of thzs section. 310.9.1.3 Po�ver source. xn new construction, requixed smolce detectozs shall receive their pzi- mary pozver from the build.ing wiring when such wising is sezved from a corrunercial source and shall be equipped with a battery bacl<up. The detector shall emit a signal when the batteries are Io�v. tiYiri.ng shall be permanent and�irxthout a disconnecting stivitch other than those required for ovez- current protection. Sznolce detectors may be solely battery operated when i.nstalled in existing build.ings; or i.n bui.Idangs�vi�thout comznercial potiver; or in buildings tivhich undergo alterations, ,repairs or additions xegulated by Section 310.9.J..2. 3I0.9.1.4 X.ocation tivithi�n dwelling unzts. xn dwel.ling uni�ts, a detector sha1T�be installed in each sleeping room and at a point centrally located in the corridoz or area givixig access to each separate sleeping area. When the dwelling uzut has moze than one stoxy and in d�vellings with basements, a deiector shall be i.nstal.led on each story and in the basement. 7si dtivelling uzuts�vhere a story or base- ment xs spI.it i.nto two or m.ore levels, the smolce detector shall be izista7J.ed on the upper Ievel, except that tivhen the�otivez l.evel coz�tains a sleeping area, a detector sha1J,be znstal.T�ed on each Ievel.VYhen sleeping xooms are on an upper level, the detector shall be placed at the ceiling of the upper�evel in close proximzty to the staiz-tivay. xn d«relling uruts tivhere the ceiling height of a zoom operi to the hal.hvay servi.zig the bedrooms exceeds that of the hallway by 24 i.z�ches (6I.0 mm) or xnore, smoke detectors shall be installed in the halltivay and in the adjacent room. X?etectors shall sound an alarm audible in all sleeping areas of the dtivelling unit i�n whzch they are located.