EST3 Installation and Service Manual B.1
Appendix B
System calculations
Summary
This appendix provides worksheets for calculating system
parameters, such as wire distance, battery capacity, and memory.
Content
Network data riser limits • B.2
Overview • B.2
Data network specifications • B.2
Cable properties • B.3
Calculating a maximum length • B.3
Calculating maximum wire capacitance per foot • B.4
Signature data circuit wire length • B.5
Determining the maximum allowable branch length • B.5
Determining the total loop length • B.10
Notification appliance circuit calculations • B.11
Introduction • B.11
What you’ll need • B.11
Worksheet method • B.13
Equation method • B.14
25 or 70 Vrms NAC wire length • B.17
Addressable analog circuit wire length • B.19
Cabinet battery • B.20
SAC bus power • B.21
Determining the need for a remote power supply • B.21
Providing adequate voltage for devices • B.23
CPU memory • B.26
Fiber optic cable worksheet • B.28
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