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Appendix C: Battery Calculations (Selection Guide)
Use the form below to determine the required batteries.
Total Current Requirement
ALARM (B)______ Amps.
Battery Capacity Requirement
([STANDBY (A) ______] x [(24 or 60 Hours) ________]) + ([ALARM (B) ______] x [
Alarm in Hr.] _______) = (C) ________AH
Battery Selection
Multiply (C) by 1.20 to derate battery.
* Assuming three initiating circuits in alarm.
Use 0.084 for five minutes of alarm as a multiplier figure.
Using the C2W-BA 2-wire smoke detector. See Appendix B, for other available smoke detectors.
IMPORTANT NOTICE
The main AC branch circuit connection for the Fire Alarm Control Unit must provide a dedicated continuous
power without provision of any disconnect devices. Use #12 AWG wire with 600-volt insulation and proper
over-current circuit protection that complies with the local codes.
Power Requirements (All currents are in amperes)
Model Number Description Qty Standby
Total
Standby
Alarm
Total
Alarm
FA-106 Fire Alarm, 6 Det, 2 Sig X 0.170 = 0.262 =
FA-103 Fire Alarm, 3 Det. 2 Sig X 0.143 = 0.244 =
RTI-1 Remote Trouble Indicator X 0.035 = 0.035 =
2-Wire Smoke Detectors X
0.0001
=
* 0.090
= 0.090
4-Wire Smoke Detectors X = =
Signal Load (bells, horns, strobes, and etc.)
=
Auxiliary Power Supply
Total currents (Add above currents) Standby (A)Alarm(B)
Note: Batteries BAT-12V5A (5 AH) and BAT-12V7A (7 AH) fit in the backbox; all larger batteries such
as BAT-12V12A (12AH) and the BAT-12V18A (18AH) require an external battery box.
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