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 ceiling 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 of the
ceiling height (0.1 H), spot-type detectors shall be located
with smooth ceiling spacing perpendicular to the beams.shall apply:
(a) Where beam spacing is equal to or greater than 40 percent
of the ceiling height (0.4 H), spot-type detectors
shall be located on the ceiling in each beam pocket.
(b) Where beam spacing is less than 40 percent of the
ceiling height (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 (0.1 H), spacing shall be 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 (0.1 H), spacing shall be in accordance
with 17.7.3.2.4.2(2).
17.7.3.2.4.3* For sloping ceilings with beams running parallelup slope, the following shall apply:(1) Spot-type detector(s) shall be located on the ceiling withinbeam pocket(s).(2) The ceiling height shall be taken as the average heightover slope.(3) Spacing shall be measured along a horizontal projectionof the ceiling.(4) Smooth ceiling spacing shall be permitted within beampocket(s) parallel to the beams.(5) For beam depths less than or equal to 10 percent of theceiling height (0.1 H), spot-type detectors shall be locatedwith smooth ceiling spacing perpendicular to the beams.shall apply:(a) Where beam spacing is equal to or greater than 40 percentof the ceiling height (0.4 H), spot-type detectorsshall be located on the ceiling in each beam pocket.(b) Where beam spacing is less than 40 percent of theceiling height (0.4 H), the following shall be permittedfor spot detectors:i. Smooth ceiling spacing in the direction parallel tothe beams and at one-half smooth ceiling spacingin the direction perpendicular to the beamsii. Location of detectors either on the ceiling or onthe bottom of the beams(3)*For beam pockets formed by intersecting beams, includingwaffle or pan-type ceilings, the following shall apply:(a) For beam depths less than 10 percent of the ceilingheight (0.1 H), spacing shall be in accordance with17.7.3.2.4.2(1).(b) For beam depths greater than or equal to 10 percent天花板的高度 (0.1 H),间距应按照与 17.7.3.2.4.2(2)。
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