Installation
P/N 06-236716-001 2-3 August 2007
2-2.3 Terminating Wiring Conductors
For all subassemblies, strip 1/2-inch (13 mm) and leave straight for insertion beneath head of
screw on one side only (do not loop conductor around screw). If using stranded conductor,
twist and tin or use terminal lug.
2-2.4 Maximum Wiring Length
Table 2-3 lists wiring gauge recommendations, resistance, and maximum length.
Refer to Appendix C for maximum allowable wire resistance for alarm signaling and initiating
circuits.
2-2.5 DC Load Distribution
Operating power for all initiating and indicating circuits is provided by the power supply. 4-wire
24 Vdc smoke detectors and other listed, compatible external 24 Vdc loads may be powered
from the power auxiliary output. DC load calculations must be performed to determine if the
power supply is capable of providing the total system current demand. The calculations will
also determine the minimum standby battery capacity in accordance with applicable NFPA
codes. Refer to Appendix A for Battery Capacity Calculations.
2-2.6 Enclosure Location
Care should be taken in planning the enclosure location. The enclosure is intended only for
indoor use in a location free from rain, condensation, excessive dust, moisture or other
airborne contamination. The enclosure must not be exposed to ambient conditions outside
those specified in Appendix C.
Position the enclosure in a readily accessible and easily visible location. Ensure there is
1-1/2 ft. (457 mm) clearance or more in front and to the door hinge side of the enclosure for
the door to swing open completely.
The type of hardware is at the discretion of the installer, but must be in accordance with good
electrical and safety practices.
Table 2-3. Wiring Gauge Recommendation, Resistance, and Maximum Lengths
Wire Gauge Resistance/1000 ft. (305 m)
12 AWG 1.588 ohms
14 AWG 2.525 ohms
16 AWG 4.016 ohms
18 AWG 6.385 ohms
CAUTION
Installation on firewalls is generally not recommended. However, in situations
with no suitable alternative locations, ensure acceptance by the local AHJ before
installation.
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