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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
ALARM
TOTAL
STANDBY
ALARM
FW-C2Z,
Fire Alarm
1
X
0.110
=
0.220
=
FW-C4Z, FW-C4EZ
Control Panel
FW-EZM4
Zone Expansion
X
0.045
=
0.120
=
FW-RB4 / FW-RB8
Relay Module
X
0.005
=
0.160
=
FW-RPM
City Tie Module
X
0.035
=
0.300
=
FW-DACT
DACT / Dialer Module
X
0.045
=
0.120
=
FW-RB8
Remote Annunciator
X
0.035
=
0.090
=
FW-RTI
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 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 2.75 amperes or less for FW-C2Z, and FW-C4Z. Notification Circuits not to exceed 2.4 amperes.
Must be 6 amperes or less for FW-C4EZ. Notification Circuits not to exceed 5 amperes.
Battery Selection:
Multiply (
C
) by 1.20 to derate battery.
Use 6.5AH Batteries for the
FW-C2Z, FW-C4Z
.
Use 10AH Batteries for the
FW-C4EZ
.
The
FW-C4EZ
will charge up to 24AH Batteries if they are in an external
Battery Cabinet
.
* Assuming three Initiating Circuits in alarm.
%
Use
0.084
for five minutes of alarm as a multiplier figure.
'
Using the
1400-A
2-wire smoke detector. See Appendix "A", for other available smoke detectors .
Examples:
Configuration
24 Hrs Standby, 5 Min Alarm
60 Hrs Standby, 5 Min Alarm
FW-C2Z/4 Basic
4 AH Batteries
Not Possible
FW-C2Z/4, FW-DACT, FW-RB8, RTI
6.5 AH Batteries
Not Possible
FW-C4EZ, FW-EZM4
10 AH Batteries
12 AH Batteries
FW-C4EZ, FW-EZM4, FW-DACT, FW-RB8, 3 of FW-RB8
10 AH Batteries
24 AH Batteries
Always use the Selection Guide Chart to verify actual Battery Requirements.
