13400 Owner’s Manual
P/N 446613 Issue I Rev. A A-1
Appendix A : Reference Data
This appendix provides reference for the following topics:
• Wire selection guides
• Battery size calculations
Wire Selection Guides
Resistance of Solid Copper Wire
+
AWG Ohms per
Thousand Feet
18 8.08
16 5.08
14 3.19
12 2.01
+
N.E.C. Chapter 9, Table 8.
Initiating Device Circuit Wire Selection Guide
Each initiating circuit loop must not have a resistance greater than 100 ohms. The
following chart is based on the resistance of solid copper wire.
Maximum Wire Loop Distance (feet)
18 AWG 16 AWG 14 AWG 12 AWG
12,376 19,685 31,347 49,751
Notification Appliance Circuit Wire Selection Guide
Each Notification Appliance Circuit loop must not have a voltage drop greater than 1
volt. The following chart is based on the following premises:
1. All of the load is at the end of the wire run (worst case).
2. Resistance is of solid copper wire
Contact your local distributor or the factory if further information is needed in your
circumstances.
Maximum Wire Loop Distance (Feet)
18 AWG 16 AWG 14 AWG 12 AWG
0.1 1,237 1968 3134 4975
Signal
0.25 495 787 1253 1990
Load
0.5 247 393 626 995
(A.)
0.75 165 262 417 663
1.0 123 196 313 497
1.25 99 157 250 398
1.5 82 131 208 331
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