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. . 310.9.1 Smolce detectors. 3I0.9.I.I General.Dwelling units,•congregate residences and hote!or Iodging house guest rooms'that are used for sleeping purposes shall be provided with smolce detectors.Detectors shall be insta.11ed i.n accordance�vith the approved manufacture�s instructions. � � 310.9.1.2 Add'ztions, alterations or repairs to Group R Occupancies.When the valuation of an add.ition,alteration or repaix to a Group R Occupanry exceeds $I,000 and a permit is required, or tivhen oneor more sleeping zooms are added�or ereated in existing Group R.Occupancies, smoke detectorsshall be installed in accordance tivith Sections 3I0.9.1.3,3I0.9.I.4 and 3I0.9.I.5 of this section. FXCEP?ION:Repairs'to the exterior surfaces oF a Group R�Occupanry are exempt from the requi ments of this section. . 310.9.I.3 �'otiver source. xn new constnsction,required smvlce detectors sha11 receive theis pri- znary posver from the build.ing wiring when such wiring is served from a comniercial source and shall be equipped with a battery bacicup.�he detector shall emit a signal when the batteries are Io�v. �Yiring shall be permanent and wi.thout a disconnecting switch other than those xequired for over- current protection. Smolce detectors may be solely battery operated when installed i,n existing � buildings; ox in buildings�vithout commercial potiver; or in buildings tivhich undergo alterations, ,zepairs or addizio:s regvlated by Section 310.9.1.2. . 3I0.9.1.4 Location tivi.thin dwelling units. In dwe7ling units, a detector shall be installed in each sleepi.ng zoom and at a point centrally located in the corridor or area giving access to each separate sleeping area.When the dvsrelting umi�t has more than one story and:...-i u'.tivelli.zzgs ti;�ith bas�.:.e�ts, :. detector shall be i.nstalled on each story and in the basemen� Xn d�ve].ling uni.ts tivhere a story ar bas znent is splat into two or m.ore Ievels, the smolce detector shali be installed on the upper Ievel, excep that tivhen the lo�ver Ievel contains a sleeping area, a detector shall be i.nstalled on each Ievel.YYhen sleeping rooms are on an apper level, the detector shall be placed at the ceiling�of the upper Ievel in close pzoximity to the stainvay, xn dwelling units tivhere the ceiliz►g height of a room open to the halhvay serving the bedrooms exceeds that of the hallway by 24 inches (610 znai) or more, smoke detectors shall be installed in the halltivay and in the adjacent room. Detectors shall sound an alarrt audible in all sleepzng areas of the dtivelling unit in which they are Iocated.