Wiring Instructions
Appendix B:
Wiring Instructions
B.1
General Instructions for Electrical Wiring
To determine the correct wire gauge to be used for the installation:
Use Table 22 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.
Table 22: Maximum DC Resistance at 68°F/20ºC for Copper Wire
AWG No.
mm
2
Ohm per 100ft
Ohm per 100m
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
Use Table 23 to select wire gauge for power supply wires. DO NOT connect
any circuit or load to detectors’ supply inputs.
•
Select number of detectors connected in 1 circuit.
•
Select wiring length per your installation requirements.
•
Refer to power supply range for voltage extreme applied.
Table 23: Wiring Length in Feet/Meters
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