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APPENDIX "D" - POWER SUPPLY & BATTERY CALCULATIONS (SELECTION GUIDE)
Use the form below to determine the required Secondary Power Supply (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.
Refer to appendix "C" for specifications.
POWER REQUIREMENTS (ALL CURRENTS ARE IN AMPERES)
Model Number
Description
Qty
STANDBY
TOTAL
STANDBY
ALARM
TOTAL
ALARM
Flex 4
Fire Alarm Control Panel
X
0.110
=
0.220
=
Flex 8 or
Flex 4 with CEM
Fire Alarm Control Panel or
Fire Alarm Control Panel w/
Circuit Expander Module
X
0.155
=
0.340
=
RY4 / RY8
Relay Module
X
0.005
=
0.160
=
PRM
City Tie Module
X
0.035
=
0.300
=
DACT
Digital Alarm
Communicator Module
X
0.045
=
0.120
=
RA8
Remote Annunciator
X
0.035
=
0.090
=
RTI
Remote Trouble Indicator
X
0.035
=
0.035
=
71033 or 30955 Photo Smoke Detector
X
0.000110
=
0.052
=
71034 or 30954 Ion Smoke Detector
X
0.000081
=
0.052
=
71035 or 71035-160 or 71035-210 Heat Detector
X
0.000057
=
0.052
=
71443 Combination Photo/Heat Detector
X
0.000185
=
0.052
=
Signal Load (bells, horns, strobes, and etc.)
=
=
Auxiliary Power Supply for Annunciators, etc.
=
ALARM
=
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
Total Alarm Current:
Must be 6 amperes or less. Indicating Circuits not to exceed 5 amperes.
Battery Selection:
Multiply (
C
) by 1.20 to derate battery.
The control panel will charge up to 24AH Batteries in a separate Listed enclosure.
*** Use
0.084
for five minutes of alarm as a multiplier figure.
Examples:
Configuration
24 Hrs Standby, 5 Min Alarm
60 Hrs Standby, 5 Min Alarm
Flex 4
Basic (2A alarm)
4 AH Batteries
8 AH Batteries
Flex 4, DACT, RY8
(2A alarm)
7.0 AH Batteries
12 AH Batteries
Flex 8
(
Flex 4
with
CEM
) (4A alarm)
12 AH Batteries
12 AH Batteries
Flex 8
(
Flex 4
with
CEM
) ,
DACT
,
RY8
,
12 AH Batteries
24 AH Batteries
3 x
RA8
(4A alarm)
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