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420.1 General
Occupancies in Groups R-1, R-2, R-2.1, R-3, R-3.1 and R-4 shall comply with the provisions of Sections 420.1 through 420.6 and other applicable provisions of this code.
420.2 Separation Walls
Walls separating dwelling units in the same building, walls separating sleeping units in the same building and walls separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as fire partitions in accordance with Section 708.
420.3 Horizontal Separation
Floor assemblies separating dwelling units in the same buildings, floor assemblies separating sleeping units in the same building and floor assemblies separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as horizontal assemblies in accordance with Section 711.
420.4 Smoke Barriers in Group R-2.1
Smoke barriers shall be provided in Group R-2.1 to subdivide every story used by persons receiving care, treatment or sleeping and to provide other stories with an occupant load of 50 or more persons, into no fewer than two smoke compartments. Such stories shall be divided into smoke compartments with an area of not more than 22,500 square feet (2092 m2) and the distance of travel from any point in a smoke compartment to a smoke barrier door shall not exceed 200 feet (60 960 mm). The smoke barrier shall be in accordance with Section 709.
420.4.1 Refuge Area
Refuge areas shall be provided within each smoke compartment. The size of the refuge area shall accommodate the occupants and care recipients from the adjoining smoke compartment. Where a smoke compartment is adjoined by two or more smoke compartments, the minimum area of the refuge area shall accommodate the largest occupant load of the adjoining compartments. The size of the refuge area shall provide the following:
  1. Not less than 15 net square feet (1.4 m2) for each care recipient.
  2. Not less than 6 net square feet (0.56 m2) for other occupants.
Areas or spaces permitted to be included in the calculation of the refuge area are corridors, lounge or dining areas and other low-hazard areas.
[F] 420.5 Automatic Sprinkler System
Group R occupancies shall be equipped throughout with an automatic sprinkler system in accordance with Section 903.2.8. Group R-2.1 occupancies shall be equipped throughout with an automatic sprinkler system in accordance with Section 903.2.6. Quick-response or residential automatic sprinklers shall be installed in accordance with Section 903.3.2.
[F] 420.6 Fire Alarm Systems and Smoke Alarms
Fire alarm systems and smoke alarms shall be provided in Group R-1, R-2, R-2.1 and R-4 occupancies in accordance with Sections 907.2.6, 907.2.8, 907.2.9 and 907.2.10, respectively. Single- or multiple- station smoke alarms shall be provided in Groups R-2, R-2.1, R-3 and R-4 in accordance with Section 907.2.11.
420.7 (HCD 1) Construction Waste Management
Recycle and/or salvage for reuse a minimum of 65 percent of the non-hazardous construction and demolition waste in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.4.
420.8 Special Provisions for Residential Hotels. (HCD 1 & HCD 1-AC)
420.8.1 Locking Mail Receptacles
A locking mail receptacle for each residential unit shall be provided in all residential hotels pursuant to the requirements specified in Heath and Safety Code Section 17958.3.
420.9 (HCD 1) Electric Vehicle (EV) Charging for New Construction
Newly constructed Group R-2 and R-3 buildings shall be provided with an infrastructure to facilitate future installation and use of electric vehicle (EV) chargers in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.1.
420.10 Licensed 24-Hour Care Facilities in a Group R-2.1, R-3.1 or R-4 Occupancy
See Section 435 for Special Provisions for licensed 24-hour care facilities in a Group R-2.1, R-3.1, or R-4 occupancy.

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