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Kidde Gemini II System
There is no known protective device available
that is capable of protecting equipment from
damage caused by a direct lightning hit due to
the extremely high energy released (10 million
to 100 million volts at 10,000 to 30,000 or more
amperes). However, line surges from indirect
strikes and voltage spikes induced through
power line load switching can be minimized by
the addition of transient suppressors.
Although the Kidde Gemini II circuits have
transient protection devices, additional
protection is required in areas subject to above
average lightning activity or induced voltage
spikes and fluctuations due to power line load
switching.
7-3.1.3
WIRING CONDUCTORS
Table 7-1 lists Recommended Conductor Sizes for use with
the Kidde Gemini II System. For all subassemblies, strip
½" and leave straight for insertion beneath head of screw on
one side only (do not loop conductor around screw). If us-
ing stranded conductor, twist and tin or use terminal lug.
Table 7-1. Recommended Conductor Sizes
Note: I
= Sum of current ratings (in amps) of all signal-
T
ing devices in the circuit.
1 = Assumed maximum line voltage drop, 1 volt.
R = Total resistance of wire in the circuit (refer to
Table 7-2 below).
Table 7-2. Resistance of Copper Wire Per 1000 feet
The following is a sample wire resistance calculation to
determine the appropriate conductor size to be used for a
Signal Circuit:
06-235975-001
•
Wire length from T1 to EOLD
•
Wire length from T4 to EOLD
•
Total length
•
1,000 feet of 18 AWG wire
•
Therefore (500/1000) x 8.08
The following table shows the Recommended Color Code
for wiring conductors in Fire Suppression installations:
Table 7-3. Recommended Color Code For Fire
7.3.1.4
Operating power for all initiating and indicating circuits is
provided by the power supply. 24 Vdc, 4-wire smoke de-
tectors and other listed, compatible external loads may be
powered by the Kidde Gemini II power supply. DC load cal-
culations must be performed to determine if the power sup-
ply 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.
7-3.1.5
Care should be taken in planning the enclosure location.
The enclosure is intended only for inside use on building
interior applications free from rain, condensation, exces-
sive dust, moisture or other airborne contamination. The
7-2
firealarmresources.com
Figure 7-1. Signal Circuit Sample
Suppression Installations
DC LOAD DISTRIBUTION
ENCLOSURE LOCATION
= 250 feet
= 250 feet
= 500 feet
= 8.08 ohms
= 4.04 ohms
November 2002
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