907.2.11 Single- And Multiple-Station Smoke Alarms

Listed single- and multiple-station smoke alarms complying with UL 217 shall be installed in accordance with Sections 907.2.11.1 through 907.2.11.4 and NFPA 72.

Single- or multiple-station smoke alarms shall be installed and maintained in Groups R-2, R-3, and I-1, regardless of occupant load at all of the following locations within all dwelling units:

1. On the ceiling or wall outside of each room used for sleeping purposes within 15 feet (4572 mm) from the door to such room.
2. In each room used for sleeping purposes.
   
   Exception: Single- or multiple-station smoke alarms in Group I-1 shall not be required where smoke detectors are provided in the sleeping rooms as part of an automatic smoke detection system.
3. In each story within a dwelling unit, including below-grade stories and penthouses of any area, but not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels and without an intervening door between the adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level.

Required smoke alarms shall receive their primary power from a dedicated branch circuit or the unswitched portion of a branch circuit also used for power and lighting, 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 over-current protection.

Where more than one smoke alarm or detector is required to be installed within an individual dwelling unit in Group I-1, R-2, R-3, or within an individual dwelling unit or sleeping unit in Group R- 1, the smoke alarms or detectors shall be interconnected in such a manner that the activation of one alarm or detector will activate all of the alarms or detectors in the individual unit. The alarm or detector shall be clearly audible in all bedrooms over background noise levels with all intervening doors closed.

Smoke alarms shall be provided with the capability to support visible alarm notification appliances in accordance with ICC/ANSI A117.1.

On and after January 1, 2021, smoke alarms and smoke detectors shall not be installed or replaced in an individual dwelling or sleeping unit, including dwellings or units in prior code buildings, within an area of exclusion determined by a 20 foot (6.0 m) radial distance along a horizontal flow path from a stationary or fixed cooking appliance, unless listed in accordance with the 8^th edition of UL 217 for smoke alarms or the 7^th edition of UL 268 for smoke detectors.

*Section 907.2.11.5 was added by: Local Law 113 of 2018. This law has an effective date of June 9, 2018.