Residential Smoke Alarms
2007 KRC R313 SMOKE ALARMS 01/04/2008
Section R313 of the 2007 Kentucky Residential Code requires smoke alarms (including
detectors), listed in accordance with Underwriters Laboratory (UL) 217, to be installed at the
following locations:
|) in each sleeping room
2) outside each sleeping area in the immediate vicinity of bedrooms
3) on each additional story of a dwelling, including basements.
Smoke Alarms are prohibited from being installed in the following locations:
1) Where temperatures fall below 32 degrees F
2) Where temperatures rise above 100 degrees F
Smoke Alarms are not recommended for installation in the following locations:
I) Crawl Spaces
2) Uninhabitable Attics
3) Closer than 3 feet from a door to a kitchen or bathroom with a tub or show, with the
exception of alarms specifically listed for the application.
Manufacturer’s instructions and National Fire Protection Association (NFPA) 72 must also be
followed during installation. NFPA 72 is the national fire alarm code and it defines the term
immediate vicinity and exact mounting parameters. For the sake of simplicity, clarity and
uniformity, the Authority Having Jurisdiction (AHJ) provides the following binding
Usually, two types of smoke alarms are available: ionization and photoelectric. Typically, both
are spot-type smoke alarms, and when installed on smooth ceilings a separation of no more than
30 feet 1s sufficient to protect the area. Bedroom entrances separated by less than 30 feet may be
protected by a single alarm not more than 15 feet away from a protected entrance. If the distance
between bedroom entrances is greater than 30 feet, additional smoke alarms are required.
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Dining room Kitchen Bedroom Pe N Diagram B
Ty Za >
room a = >
Living room _ „и ``
= 21 Bedroom pa — >
| (2) 2. „ { z =
и. N ra
a + Bedroom Hall Bedroom
Headroom Diagram A
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Basement +
2007 KRC R313
NFPA 72 has guidelines for the placement of smoke alarms on walls or ceiling. A smoke alarm
mounted on a ceiling is not to be closer than 4 inches from a wall. If mounted on a wall, the top
of a smoke alarm must be between 4 to 12 inches from the ceiling (diagram C). Mounting of a
smoke alarm on a sloped, pitched, or cathedral ceiling, must be at or within 3 feet of the highest
point of the peak (diagram D).
Smoke Detector Installation
for Pitched, Sloped, or
Cathedral Ceilings
Ceiling (97 т)
x 4in.
Acceptable here A (01 m)
5 x CET UT
Never here N
Top of detedor Л en
acceptable here (0.3 m)
Measurements shown are to the
closest edge ofthe detector
Side mail
Diagram C
Diagram D
| | |
i |
«À | En
= 7
3 feet
Horizontal Distance
From Peak
Smoke alarms are also required to be interconnected such that the actuation of one alarm will
actuate all the alarms in the individual unit. Smoke alarms are required to receive their primary
power from the electrical service and a secondary power source of a battery.
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