Model 3600-I IR3 Flame Detector
Page 48 of 66
APPENDIX B. WIRING INSTRUCTIONS
Appendix B.1. General Instructions for Electrical Wiring
Follow the instructions detailed in this section for determining the correct wire gauge to be used for the
installation.
1. Use the table below to determine the required wire gauge/size for general wiring, such as
relay wiring. Calculate the permitted voltage drop with respect to load current, wire gauge and
length of wires.
AWG #
mm2
Ohm per 100 ft.
Ohm per 100 m
26
0.12 - 0.15
4.32
14.15
24
0.16 - 0.24
3.42
11.22
22
0.30 - 0.38
1.71
5.60
20
0.51 - 0.61
1.07
3.50
18
0.81 - 0.96
0.67
2.20
16
1.22 - 1.43
0.43
1.40
14
1.94 - 2.28
0.27
0.88
12
3.09 - 3.40
0.17
0.55
10
4.56 - 6.64
0.11
0.35
Figure 35: Maximum DC Resistance at 68°F (20°C) for Copper Wire
2. Select wire gauge for power supply wires using the table below. DO NOT connect any circuit
or load to detectors’ supply inputs.
o
Select
Number of detectors
connected in one circuit
o
Select wiring
Length
per installation requirements
o
Refer to
Power Supply Range
for voltage extreme applied
Number of
Detectors
Recommended Wire Diameter (AWG)
Power Supply
Range (VDC)
24
18
16
14
-
-
22-32
20
18
16
14
-
-
22-32
16
20
18
16
14
-
22-32
12
20
18
16
14
-
20-32
8
20
18
16
14
-
20-32
4 and less
20
18
16
16
14
20-32
Ft (m)
164 (50)
328 (100)
492 (150) 656 (200)
820 (240)
Max. Length from Power Supply to Last Detector
Figure 36: Wiring Length in feet (meters)
