Spectrex Xenon 700 SIL Open-Path Gas Detection System - Manual (Page 65)

General Instructions For Electrical Wiring 53
A Wire Selection Tables
➣ In this appendix…
General Instructions For Electrical Wiring page 53
A.1 General Instructions For Electrical Wiring
Refer to Table 22 to determine the required wire gauge for general wiring,
such as relay wiring. Calculate the permitted voltage fall with respect to
loads current, wire gauge and length of wires.
Refer to Table 23 to select wire gauge for power supply wires. DO NOT
connect any circuit or load to Detectors’ supply inputs.
Table 22: Maximum DC resistance at 68˚F for copper wire
AWG # mm 2 Ohm per 100 ft. Ohm/100 meter
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
1 Select "Number of Detectors" connected in one circuit.
2 Select "wiring length" per your installation requirements.
3 Refer to "power supply range" for voltage extreme applied.