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Battery Calculations
Appendix A
When the optional FC-PSM(E) Power Supply/Battery Charger is installed, use the Total Standby and Alarm Load
Currents calculated in Table A-2 and Table A-3 for the following battery calculation. When powered by an external
power source via TB3, use Table A-2 and Table A-3 to assist in the battery calculations.
Enter the total standby current requirements into Table A-2 for the FIRE•COMMAND•25/50. When the optional
FC-PSM(E) Power Supply/Battery Charger is installed, enter total standby current requirements calculated in Table
A-2 into Table A-1 . If power is being provided by regulated 24 VDC from a separate power supply such as the
FCPS-24F(E) or an FACP, use the standby current calculated in Table A-2 to calculate battery requirements for the
separate power supply or FACP.
TABLE A-2:
Device Type
Main circuit board and one
Audio Amplifier
FC-PSM(E)
Optional Audio Amplifier
(FC-AAM25)
Additional Draw from TB4
Aux Power
(0.035 amps maximum)
1. The FC-XRM70 Transformer Module draws no current in standby.
2. The FC-LPS Local Playback Speaker Module draws no current in standby.
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Battery Calculations
Battery Calculations
TABLE A-1:
Standby Load
Current in amps
X
(from Table A-2)
[
]
Alarm Load
Current in amps
X
(from Table A-3)
[
]
Add Standby and Alarm Load for Required Ampere Hour Battery
Multiplying by derating factor of 1.2
Total Ampere Hour Battery
1. NFPA requires a minimum of 15 minutes of alarm time and 24 hours standby time for voice mes-
sage systems. Consult Local Authority Having Jurisdiction for local requirements.
2. 7 Ampere Hour battery can be located in the FIRE•COMMAND•25/50 backbox.
3. Greater than 7 Ampere Hour up to 17 Ampere Hour battery requires the BB-17F battery box.
Regulated Load in Standby
# of Devices
(1 maximum)
(1 maximum)
1
2
,
(1 maximum)
Sum Column for Standby Load
firealarmresources.com
Required Standby Time in Hours
(24 or 60 Hours)
[
]
Required Alarm Time in Hours
1
(i.e. 15 min. = 0.250 Hours)
[
]
2
3
,
Current
(amps)
X
0.180
X
0.030
X
0.030
[
]
Document #50580
Rev. C
8/12/97
=
____________
=
____________
____________
X 1.2
=
____________
Total Current
(amps)
=
0.180
=
=
=
=
amps
P/N 50580:C
43
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