Specifications

FS-250 Installation and Operation Manual
41
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
*NEC Chapter 9, Table 8.
Notification Appliance Circuit Wire Selection Guide
Each Notification Appliance Circuit must not have a voltage drop greater than 1 volt. The
following chart is based on these premises:
• The entire load is at the end of the wire run (worst case).
• 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) 18 AWG 16 AWG 14 AWG 12 AWG
0.1
1,237 1968 3134 4975
0.25
495 787 1253 1990
0.5
247 393 626 995
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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