SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
PAGE 4-56 REV. 11 2014-SEP-01
R-102 Restaurant Fire Suppression Manual
OVERLAPPING NOZZLE COVERAGE (Continued)
Overlapping Appliance Nozzle and Hazard Zone Locations
– Group Protection (Continued)
4. On protected appliances, all hazard surfaces located in a
group must be within 40-45 in. (1016-1143 mm) from the
nozzle(s). Once that dimension is exceeded, a new group
must be started. See Figure 4-112.
Note:
The supply pipe feeding nozzle groups is to be at the
same elevation. Adjust height for each group only by varying
lengths of nozzle drops.
FIGURE 4-112
006917
Detection Requirements For Overlapping Appliance
Protection
When utilizing overlapping appliance protection, fusible link
detectors must be installed on a maximum of 2 ft (0.6 m) centers,
starting with detectors located in (under) the duct opening(s).
Starting from the detector under the duct opening, add detectors
on 2 ft (0.6 m) maximum spacing until the complete length of the
plenum area is covered, from one end to the other. The location
of the last detector on each end of the plenum must not exceed
2 ft (0.6 m) from end of plenum.
Note:
Standard detector coverage, as specified in “Design
Section,” is acceptable when utilizing dedicated nozzle
coverages.
GROUP “A”
6 IN. (152 mm)
MAXIMUM
6 IN. (152 mm)
MAXIMUM
NOZZLES
NOZZLES
GROUP “B”
45 IN.
(1143 mm)
40 IN.
(1016 mm)
45 IN.
(1143 mm)
40 IN.
(1016 mm)
Summary of Contents for R-102
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