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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