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APPENDIX "B" - BATTERY CALCULATIONS (SELECTION GUIDE)
Use the form below to determine the required batteries.
IMPORTANT NOTICE
The main AC branch circuit connection for 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 ALARM TOTAL
STANDBY ALARM
FA-101U Fire Alarm , 1 Det, 1 Sig X 0.066 = 0.125 =
FA-102U Fire Alarm, 2 Det, 1 Sig X 0.076 = 0.135 =
FA-1025U Fire Alarm, 5 Det, 2 Sig X 0.114 = 0.200 =
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.) =
Total currents (Add above currents) STANDBY (A) (B)
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.
Batteries BA-104 (4.0AH) and BA-1065(6.5AH) fit into the backboxes ; all larger batteries such as BA-110(10AH) and the BA-117(17AH)
require an external battery box.
* Assuming three Initiating Circuits in alarm.
% Use 0.084 for five minutes of alarm or 0.5 for thirty minutes of alarm as a multiplier figure.
' Using the MIR-425/U 2-wire smoke detector. See Appendix "A", for other available smoke detectors .
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