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17.7.3.2.4.1 Solid joists shall be considered equivalent to beams for smoke detector
spacing guidelines.
17.7.3.2.4.2 For level ceilings, the following shall apply:
(1) For ceilings with beam depths of less than 10 percent of the ceiling height (0.1H),
smooth ceiling spacing shall be permitted. Spot-type smoke detectors shall be
permitted to be located on ceilings or on the bottom of beams.
(2) For ceilings with beam depths equal to or greater than 10 percent of the ceiling
height (0.1H), the following shall apply:
(a) Where beam spacing is equal to or greater than 400 percent of the ceiling
heights (0.4 H), the following shall be permitted for spot detectors:
i. Smooth ceiling spacing in the direction parallel to the beams and at one-half
smooth ceiling spacing in the direction perpendicular to the beams
ii. Location of detectors either on the ceiling or on the bottom of the beams
(3) For beam pockets formed by intersecting beams, including waffle or pan-type
ceilings, the following shall apply:
(a) For beam depths less than 10 percent of the ceiling height (0.1H), spacing shall
in accordance with 17.7.3.2.4.2(1).
(b) For beam depths greater than or equal to 10 percent of the ceiling height
(0.1H), spacing shall be in accordance 17.7.3.2.4.2(2).
(4) For corridors 15ft (4.6 m) in width or less having ceiling beams or solid joists
perpendicular to the corridor length, the following shall apply:
(a) Smooth ceiling spacing shall be permitted
(b) Location of spot-type smoke detectors on ceilings, sidewalls, or the bottom of
beams or solid joists.
(5) For rooms of 900 ft
(84 m
) or less, the following shall be permitted:
2
2
(a) Use of smooth ceiling spacing
(b) Location of spot-type smoke detectors on ceilings or on the bottom of beams
17.7.3.2.4.3 For sloping ceilings with beams running parallel up slope, the following shall
apply.
(1) Spot-type detector(s) shall be located on the ceilings within beam pocket(s).
(2) The ceiling height shall be taken as the average height over slope.
(3) Spacing shall be measured along a horizontal projection of the ceiling
(4) Smooth ceiling spacing shall be permitted within beam pocket(s) parallel to the
beams.
(5) For beam depths less than or equal to 10 percent the ceiling height (0.1 H),
spot-type detectors shall be located with smooth ceiling spacing perpendicular to
the beams.
(6) For beam depths greater than 10 percent of the ceiling height (0.1 H), the following
shall apply for spacing perpendicular to the beams:
(a) For beam spacing greater than or equal to 40 percent of the ceiling height (0.4
H), spot-type detectors shall be located in each beam pocket.
(b) For beam spacing less than 40 percent of the ceiling height (0.4 H), spot-type
detectors shall not be required in every beam pocket but shall be spaced not
greater than 50 percent of smooth ceiling spacing.
17.7.3.2.4.4 For sloping ceilings with beams running perpendicular across slope, the
following shall apply:
(1) Spot-type detector(s) shall be located at the bottom of the beams
(2) The ceiling height shall be taken as the average height over slope
(3) Spacing shall be measured along a horizontal projection of the ceiling
(4) Smooth ceiling spacing shall be permitted within beam pocket(s).
(5) For beam depths less than or equal to 10 percent of the ceiling height (0.1 H),
spot-type detectors shall be located with smooth ceiling spacing.
(6) For beam depths greater than 10 percent of the ceiling height (0.1 H), spot-type
detectors shall not be required to be located closer than (0.4 H) and shall not
exceed 50 percent of smooth ceiling spacing.
17.7.3.2.4.5 For sloped ceilings with beam pockets formed by intersecting beams, the
following shall apply:
(1) Spot-type detector(s) shall be located at the bottom of the beams.
(2) The ceiling height shall be taken as the average height over slope.
(3) Spacing shall be measured along a horizontal projection of the ceiling.
(4) For beam depths less than or equal to 10 percent of the ceiling height (0.1 H),
spot-type detectors shall be spaced with not more than three beams between
detectors and shall not exceed smooth ceiling spacing
(5) For beam depths greater than 10 percent of the ceiling height (0.1 H), spot-type
detectors shall be spaced with not more than two beams between detectors, but
shall not be required to be spaced closer than (0.4 H), and shall not exceed 50
percent of smooth ceiling spacing.
17.7.3.2.4.6 For sloped ceilings with solid joists, the detectors shall be located on the
bottom of the joist.
17.7.3.3 Peaked. Detectors shall first be spaced and located within 36 in. (910 mm) of
the peak, measured horizontally. The number and spacing of additional detectors, if
any, shall be based on the horizontal projection of the ceiling.
17.7.3.4 Shed. Detectors shall first be spaced and located within 36 in. (910 mm) of the
high side of the ceiling, measured horizontally. The number and spacing of additional
detectors, if any, shall be based on the horizontal projection of the ceiling.
17.7.3.5 Raised Floors and Suspended Ceilings. Spaces beneath raised floors and
above suspended ceilings shall be treated as separate rooms for smoke detector
spacing purposes. Detectors installed beneath raised floors or above suspended
ceilings, or both, including raised floors and suspended ceilings used for environmental
air, shall not be used in lieu of providing detection within the room.
17.7.3.5.1 For raised floors, the following shall apply:
(1) Detectors installed beneath raised floors shall be spaced in accordance 17.7.3.1,
17.7.3.1.3, and 17.7.3.2.2.
(2) Where the area beneath the raised floor is also used for environmental air, detector
spacing shall also conform to 17.7.4.1 and 17.7.4.2.
17.7.3.5.2 For suspended ceilings, the following shall apply:
(1) Detector spacing above suspended ceilings shall conform to the requirements of
17.7.3 for the ceiling configuration
(2) Where detectors are installed in ceilings used for environmental air, detector
spacing shall also conform to 17.7.4.1 and 17.7.4.2.
INSTALLATION OF 8000 SERIES
MOUNT ROUGH-IN BOX & RUN WIRING
IMPORTANT: INSURE THAT ALL FLUORESCENT LIGHTING FIXTURES ARE
PROPERLY GROUNDED.
1. Use a 2" x 3" switch box or a 4" square or octagon junction box. Mount a box for
each smoke detector and run the system fire detection circuit plus the power circuit to
all smoke detector locations. See Wiring Diagrams, FIGURES A and B, for Latching
Models, and FIGURES C and D for Self Clearing Models.
NOTICE: THE WIRING TO BE USED SHALL BE IN ACCORDANCE WITH THE
PROVISIONS OF ARTICLE 300.3(B) OF THE NATIONAL ELECTRICAL CODE,
NFPA 70, AS WELL AS ARTICLE 210.
CAUTION: Break wire runs to provide supervision for connections made to each wire
pair.
NOTICE:
120 AC VOLTAGE (8100 & 8103 SERIES):
HOT (BLACK) WIRE: PIN 3 AND PIN 6
NEUTRAL (WHITE) WIRE: PIN 12 AND PIN 15
24 DC VOLTAGE (8240 & 8243 SERIES):
POSITIVE (RED) WIRE: PIN 3 AND PIN 6
NEGATIVE (BLACK) WIRE: PIN 12 AND PIN 15
FIGURE A
CLASS B PANEL WIRING DIAGRAM
FIGURE B
CLASS A PANEL WIRING DIAGRAM
550-0139
Pg. 8-2
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