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SECTtON!V — SYSTEM DESIGN <br /> UL EX3470 ULC EX3470 Page 4-43.3 <br /> REV.O 7-1-OB <br /> OVERI.AP?ING NOZZLE COVERAGE(Continued) <br /> Overlapptng Appliance Noule and Hazard Zone Locations— <br /> Group Protectton(Continued) <br /> a On protected appiiances, a11 hazard surfaces located in a <br /> group must be wilhin 40-45 in. (102-114 cm) from the noz- <br /> zle(s} Once that dimension is exceeded,a new group must be <br /> started.See Figure 91h. <br /> Note:The supply pipe feedfng nozzle groups is to be at the <br /> same elevation.Adjust height for each group onfy by varying <br /> lengths of nozzle drops. <br /> 6 IN.(152 cm) � 6 IM.(15.2 cm) <br /> MAXIMUM �'� MAXIMUM E <br /> ������ � <br /> �t NOZZLES t � <br /> I ' I ' <br /> � NOZZIES � # <br /> 451N. � 401N. E I <br /> (114cm)���02cm) � 401N. � <br /> 1 � ' 451N. <br /> � k , (10�cm �'�14cm) <br /> �� <br /> ��—GROUP`A"-----►�—QROUP`B'---►� <br /> FIGURE 9ih <br /> ores„ <br /> Detection Requirements For Overtapping Appfiance <br /> Protection <br /> When utilizing overlapping appliance protection,fusible link detec- <br /> tors must be installed on a maximum of 2 ft (0.61 m) centers, <br /> starting with detectors located in(underj the duct oAening(s). <br /> Starting from the detector under the duct opening,add detectors <br /> on 2 ft(0.61 m)maximum spacing until the complete lengih of the <br /> plenum area is covered,from one end to the other.The location of <br /> the last detector on each end of the plenum must not exceed <br /> 2 ft(0.61 m)from end of plenum. <br /> Note:Standard detector coverage, as specified in "Design <br /> Section"is acceptable when utilizing dedicated nozzle cov- <br /> erages. <br />