Appendix-A: Reference Data; Wire Selection Guides; Resistance Of Solid Copper Wire; Addressable Device Circuit Wire Selection Guide - Siemens FC901-U3 Installation, Operation And Maintenance 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 Ohms per Thousand Feet*
18 8.08
16 5.08
14 3.19
12 2.01
*NEC Chapter 9, Table 8.

Addressable Device Circuit Wire Selection Guide

Each addressable device circuit must meet the following requirements:
Total loop resistance - 50 ohm maximum with 50 devices
Total loop capacitance - 0.5uF max line to line per km and 1.0uF max line to shield per km
The terminal blocks of Siemens SLC devices are rated for a maximum of 14AWG wire.
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