Appendix A : Reference Data; Wire Selection Guides; Resistance Of Solid Copper Wire; Initiating Device Circuit Wire Selection Guide - Faraday FireWatch 400 Owner's Manual

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
18
16
14
12
+
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
12,376

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)
Signal
Load
(A.)
P/N 446613 Issue I Rev. A
+
Ohms per
Thousand Feet
8.08
5.08
3.19
2.01
16 AWG 14 AWG
19,685 31,347
18 AWG 16 AWG
0.1 1,237
0.25 495
0.5 247
0.75 165
1.0 123
1.25 99
1.5 82
firealarmresources.com
13400 Owner's Manual
12 AWG
49,751
14 AWG 12 AWG
1968 3134
787 1253
393 626
262 417
196 313
157 250
131 208
4975
1990
995
663
497
398
331
A-1