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a ATTAC H M E N T C 2. Smoke alarms. Single or:multiple-station smoke alarms shall be installed and maintained `in rental praperties within a11 residential occupancies regardless of occupant load at all of the following iocations: : _ . _ __ _ __ _ a. On th� ceiiing ot wall outside:af each separate sleeging area in the-immediate vicinity o�bedroQms. b. : In each room used far �lee�:' � purposes: c. In each story withtn a dwelling unit, including basements and cellars but not includir�g ;crawl spaces and unu�liabitable a�Eics. In dwellings or dwelling units with spiit levels and �vithout an intervening :door ben�een the adjacent levels, a smoke:alarm installed on the upper level sl�all suffice for the adjacent Iower ievel provided that the lower level is iess than one fuIl story below the upper level; Single or rr�ultiple-station smoke aiarrns s1iall be installed, in other groups in` accardance with the InternationaI Fire Code: 3. Power source. In Group R occupancies and in dwellings not reb lated as Group R occupancies, single-station smoke alarms shall receive their primary power from the building wiring provided that such wiring is served from a commercial source and shall be equipped with a battery backup. Smoke alarms shall emit a signal when the batteries are low. Wiring shall be permanent and without a disconnecting switch other than as required for overcurrent protection. Exception: Smoke alaran� dre nermitted to be solelv battery operated in buildin�s where no construction is talcing place, buildin�s that are not served from a commercial nower source and in egistin� areas of buildin�s under�oing alterations or renairs that do not result in the removal of interior wall or ceiling finishes exnosing the structure, unless there is an attic, crawl space or basement available which could provide access for building wiring without the removal of interior finishes. 4. Interconnection. Where more than one smoke alarm is required to be installed within an individual dwelling unit in Group R-2, R-3, R-4 and in dwellings not regulated as Group R occupancies, the smoke alartns shall be interconnected in such a manner that the activation of one alarm will activate all of the alarms in the individual unit. The alarm shall be clearly audible in all bedrooms over backb ound noise levels with all intervening doors closed. ExceAtions• 1. Interconnec4ion is not repuired in buildin�s which are not under�oin� alterations. renairs, or construction of anv kind. 2. Smoke alarms in existin� areas are not required to be interconnected where alterations or renairs do not result in the removal of interior wall or ceilin� finishes exposina the structure, unless there is an attic crawl space or basement available which could nrovide access for interconnection without the removal of interior finishes.