Residential Group R-3 and R-3.1

Residential Group R-3 and R-3.1


Fire alarm system is not required. If sprinkler system installed in accordance with NFPA 13R, monitoring might be required.

Smoke alarms
Smoke alarms shall be installed in accordance with 2019 CBC 907.2.10 and as detailed in 2019 CBC 907.2.10.2 As per 2019 CBC 907.2.10.2 Item 4 in a Group R-3.1 occupancies smoke alarms shall be installed throughout the habitable areas of the dwelling unit exept kitchens. Smoke alarms shall be equipped with a battery backup as per 2019 CBC 907.2.10.6 Multiple smoke alarm installed within an individual dwelling or sleeping unit shall be wired in tandem as per 2019 CBC 907.2.10.5 For R-3 occupancy smoke alarms can be substituted with system smoke detectors as per 2019 CBC 907.2.10 Exception Substitution is not allowed for R-3.1 occupancy as per 2019 CBC 907.2.10.2.2
907.2.10 Single‑ and multiple‑station smoke alarms.
Listed single- and multiple-station smoke alarms comply-
ing with UL 217 shall be installed in accordance with Sec-
tions 907.2.10.1 through 907.2.10.7 and NFPA 72.

Exception: For Group R occupancies. A fire alarm sys-
tem with smoke detectors located in accordance with
this section may be installed in lieu of smoke alarms.
Upon actuation of the detector, only those notification
appliances in the dwelling unit or guest room where the
detector is actuated shall activate.

907.2.10 Single‑ and multiple‑station smoke alarms.
Listed single- and multiple-station smoke alarms comply-
ing with UL 217 shall be installed in accordance with Sec-
tions 907.2.10.1 through 907.2.10.7 and NFPA 72.

Exception: For Group R occupancies. A fire alarm sys-
tem with smoke detectors located in accordance with
this section may be installed in lieu of smoke alarms.
Upon actuation of the detector, only those notification
appliances in the dwelling unit or guest room where the
detector is actuated shall activate.

907.2.10.2 Groups R-2, R-2.1, R-2.2, R-3, R-3.1,
R-4 and R-4.1.
Single- or multiple-station smoke
alarms shall be installed and maintained in Groups R-2,
R-2.1, R-2.2, R-3, R-3.1 and R-4 regardless of occupant
load at all of the following locations:

1. On the ceiling or wall outside of each separate
sleeping area in the immediate vicinity of bedrooms.

2. In each room used for sleeping purposes.

3. In each story within a dwelling unit, including
basements 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.

4. In a Group R-3.1 occupancies, in addition to the
above, smoke alarms shall be provided through-
out the habitable areas of the dwelling unit
except kitchens.
907.2.10.2 Groups R-2, R-2.1, R-2.2, R-3, R-3.1,
R-4 and R-4.1.
Single- or multiple-station smoke
alarms shall be installed and maintained in Groups R-2,
R-2.1, R-2.2, R-3, R-3.1 and R-4 regardless of occupant
load at all of the following locations:

1. On the ceiling or wall outside of each separate
sleeping area in the immediate vicinity of bedrooms.

2. In each room used for sleeping purposes.

3. In each story within a dwelling unit, including
basements 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.

4. In a Group R-3.1 occupancies, in addition to the
above, smoke alarms shall be provided through-
out the habitable areas of the dwelling unit
except kitchens.
907.2.10.5 Interconnection. Where more than one
smoke alarm is required to be installed within an indi-
vidual dwelling unit or sleeping unit in Group R occu-
pancies, the smoke alarms shall be interconnected in
such a manner that the activation of one alarm will acti-
vate all of the alarms in the individual unit. Physical
interconnection of smoke alarms shall not be required
where listed wireless alarms are installed and all alarms
sound upon activation of one alarm. The alarm shall be
clearly audible in all bedrooms over background noise
levels with all intervening doors closed.
907.2.10.6 Power source. In new construction, and
in newly classified Group R-3.1 occupancies,
required
smoke alarms shall receive their primary power from
the building wiring where such wiring is served from a
commercial source and shall be equipped with a battery
backup. Smoke alarms with integral strobes that are not
equipped with battery backup shall be connected to an
emergency electrical system in accordance with Sec-
tion 2702. Smoke alarms shall emit a signal when the
batteries are low. Wiring shall be permanent and with-
out a disconnecting switch other than as required for
overcurrent protection.

Exception: Smoke alarms are not required to be
equipped with battery backup where they are con-
nected to an emergency electrical system that com-
plies with Section 2702.
907.2.10.2.2 Group R-3.1. In all facilities housing
a bedridden client, smoke alarms shall receive their
primary power from the building wiring when such
wiring is servedfrom a commercial source and shall
be equipped with a battery backup. Smoke alarms
shall be electrically interconnected so as to cause
all smoke alarms to sound a distinctive alarm signal
upon actuation of any single smoke alarm. Such
alarm signal shall be audible throughout the facility
at a minimal level of 15 dB above ambient noise
level. These devices need not be interconnected to
any other fire alarm device, have a control unit, or
be electrically supervised or provided with emer-
gency power.

Additional Requirements as applicable.
 
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