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310.9.1 Sr.n.ake detectors. <br /> 3Z0.9.I.I General.lJu•elling units,•cong:caat:residences and hoeel or Iodging house guest <br /> rooms'that are used for sleeping purposes slzall be provided i,tizth snolce.de�ectors. Detectors shal <br /> insulled i.-1 accord.ance`�zth the approved nan�:.facture�s instzuctions. <br /> 3I0.9.1.2 Add.itions, alterations or repairs to Group R Occupancies.�rYhen the ti•aluation of an <br /> addicion,alteratzon or repair to a Group R Occezpanry exceeds $I,000 and a permit is zequized, oz <br /> tivhe-n oneor more sleepina roozas are added�o:created in existin$ Group R Qccupancies, smo!�e <br /> detectorsshall be installed in accordance tir-ith Sections 3I0.9.I.3, 3I Q.9.I.4 and 3I0.9.I.5 of this <br /> s ection. <br /> FXCEP"ZZON: Repairs'to the exterior surfaces of a Group R Occupancy are exemp�from the r <br /> ments of this section. . <br /> g Ip,g,1,3 �'otiver source. 7n new constncction, reqv.i.red smolce detectors sh�11. receive the:u pri- <br /> mary potiver from the bu.ildi.ng wiring when such��rising is served from a cornmercial souzce and <br /> shall be equipped with a battery bacicup. The d��ector shall emit a signal when the batteries are <br /> �rYi-ing shall be permanent and tivithout a disco:inecting switeh other than those required for ov <br /> current protection. Smolce detectors may be solely battery operated when installed in existing <br /> besild.ings; or zn buildings tivithou.t cor,unercial potiver; or in buildings tivhzch undergo alterations <br /> ,repairs or addicio:s regulated by Section 3I0.9.1.2. <br /> 3I0.9.I.4 x.ocation tivithi.n dwe].li.ng uni.ts. Tn dwe]J.ing unzts, a detector sha7J.be installed in e� <br /> sleeping zoom and at a point centrally located in the corridor or area giving access to each sepz <br /> sleeping area.tiYhen the dwelLir►g unit has no:e tnan one story anu:..-1 utiVz'�as :;:.'�bas-:=�=` <br /> detector shall.be i.nstalled on each story and in the basement. 7n d�velling unzts tivhere a story c <br /> ment is spli�i.nto two or moze Ievels, the smo:ce detector sha11 be installed on the upper Ievel, e <br /> tha[�vhen the Io�ver Ievel contains a sleeping area, a detector shaII be i.nstalled on each Ievel.� <br /> sleeping xooms are on an upper level, the de:ector shall be placed at the ceiling^of the upper Ie� <br /> close proximzty to the staiz-tivay, In dwe7.li.ng unzts tivheze the ceiling height of a xoom operi to t� <br /> Izalhvay servizzg the bedrooms exceeds that o;the haIlway by 24 inches (610 znrn) or znore, sm� <br /> deGectors shall be installed i.n the halltivay and in the adjacent room. De[ectors shali sound an <br /> audible in all sleeping areas of the dtivelling unit in tivhich they are Iocated. <br />