Wiring Instructions
TM40/40UFL Rev. (Al), February 2019
61
Appendix B:
Wiring Instructions
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.
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 ft/m
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
B.2
