(Amd) 8315.2 Alterations, repairs and additions.
Interconnection and hard-wiring of smoke alarms in existing areas shall not be required where the alterations or repairs do not result in the removal of interior wall or ceiling finishes, exposing the structure. Smoke alarms shall be permitted to be battery operated when installed in buildings without commercial power. Carbon monoxide alarms may be battery operated when installed in buildings without commercial power or in buildings that undergo alterations or additions regulated by Section R315.2. Wiring shall be permanent and without a disconnecting switch other than those required for overcurrent protection. When primary power from the building wiring is interrupted, they shall receive power from a battery. 
(Add) 8315.1.1 Power source. In new construction, the required carbon monoxide alarms shall be permanently installed and shall receive their primary power from the building wiring when such wiring is served from a commercial source. The alarm shall be clearly audible in all bedrooms over background-noise levels with all intervening doors closed.
a manner that the actuation of one carbon monoxide alarm will activate all of the carbon monoxide alarms in the individual unit. When more than one carbon monxide alarm is required to be installed within an individual dwelling unit the alarm devices shall be interconnected in such. (Amd) R315.1 Carbon monoxide alarms. Carbon monoxide alarms shall be installed outside of each sleeping area in the immediate vicinity of the bedrooms and on each additional habitable level of the dwelling unit. (Amd) 8314.4 Power source. Smoke alarms shall receive their primary power from the building wiring when such wiring is served from a commercial source, and when primary power is interrupted, shall receive power from a battery.
Installation, alteration or repairs of plumbing, mechanical or electrical systems are exempt from the requirements of this section. #Smoke and carbon monoxide detector windows
Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, of the addition or replacement of windows or doors, or the addition of decks without roofs, are exempt from the requirements of this section. The smoke alarms shall have a power source in accordance with Section 8314.4. (Amd) 8314.3.1 Alterations, repairs and additions. When alterations, repairs or additions requiring a permit occur, or when one or more sleeping rooms are added or created in existing dwellings, the individual dwelling shall be equipped with smoke alarms located as required for new dwellings.
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