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1 � 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 sleepin�pur- poses shall be provided with smoke detectors. Det�ctors shall be installed in accordance with the approved manufacti::ec's instruc- tions. � 310.9.1.2 Additions, alterations or repairs to Group R Occu- pancies. When the valuation of an addition, altera:ion or repair to a Group R Occupancy exceeds $1,000 and a pern:i:is required, or when one or more sleeping rooms are added or created in exist- in� Group R Occupancies, smoke detectors shall b� installed in accordance with Sections 310.9.1.3, 310.9.1.4 and 310.9.1.5 of this section. EXCEPTION: Repairs to the exterior surfaces of a Group R Occu- pancy are exempt from the requirements of this sectic�. 310.9.1.3 Po�ver source. In new construction, reeuired smoke detectors shall receive their primary power from the�uildin�wir- • ing when such wiring is served from a commercia� source and shall be equipped with a battery backup.The detecto:shall emit a signal when the batteries are low. Wiring shall be permanent and without a disconnecting switch other than those requi::.d for over- current protection. Smoke detectors may be solely battery oper- ated when installed in existing buildin�s; or in buile:n�s�-ithout commercial power; or in buildings which undergo al::rations, re- pairs or additions reaulated by Section 310.9.1.2. 310.9.1.4 Location �•ithin dwelling units. In dwelling units, a detector shall be installed in each sleeping room ar.� at a point centrally located in the corridor or area giving access to each sep- arate sleeping area. When the dwelling unit has mo:e than one story and in dwellings with basements, a detecto: shall be in- stalled on each story and in the basement. In dwellinJ units �s•here a story or basement is split into two or more levels, t�.� smoke de- � tector shall be installed on the upper level, except t::�t when the lower level contains a sleeping area, a detector shali be installed on each level. `Vhen sleepin�rooms are on an uppei l�vel, the de- tector shall be placed at the ceiling of the upper level i�close prox- imity to the stairway. In d�velling units where the ceilia�hei�ht of a room open to the hallway serving the bedrooms exc�eds that of the hall�vay by 24 inches (610 mm)or more,smoke d�tectors shall be installed in the hallway and in the adjacent roo�::. Detectors shall sound an alarm audible in all sleeping areas of the d«•elling unit in �vhich they are located. 4 J��.S� l�-�d IZ�-1 ��l UrL�