16
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.