907.2.9 Group R-2.
BC § 907.2.9
A fire alarm system without alarm notification appliances and smoke alarms shall be installed in accordance with this section in Group R-2 occupancies, other than student apartments, where such occupancy satisfies any one of the following conditions: 1. Any dwelling unit is located three or more stories above the lowest level of exit discharge, including dwelling units in penthouses of any area; 2. Any dwelling unit is located more than one story below the highest level of exit discharge of exits serving the dwelling unit; or 3. The building contains more than 16 dwelling units. Actuation of smoke detectors shall not initiate a signal to alarm notification appliances. The activation of any detector required by this section shall initiate a signal at a central supervising station or a constantly attended location. Smoke detectors shall be located as follows: 1. In each mechanical equipment, electrical, transformer, telephone equipment or similar room.
2.In air distribution systems in accordance with Section 606 of the New York City Mechanical Code.
3.In elevator machine rooms and in elevator lobbies.
