Battery Calculations
52
Document #50801 Rev.B 8/17/98 P/N 50801:B
A.1 Main Power Supply
The MS-2410BC provides filtered power for operating the fire alarm control panel, operating external devices and
operating the standby battery. The power for operating external devices is limited. Use Table A-2 (standby or non-
alarm) and Table A-3 (alarm) to determine if external loading is within the capabilities of the power supply.
Be certain to power 4-wire smoke detectors from TB2, Terminals 3 and 4. In Table A-2 , external devices are con-
nected to TB2 only.
TABLE A-2: Filtered Load in Standby
@24 VDC
.
Device Type
# of
Devices
Current
(amps)
Total Current
(amps)
Main Circuit Board 1 X 0.138 = 0.138
RTB Remote Trouble Buzzer (1 max.) X 0.020 =
LED-10IM (1 max.) X 0.017 =
4XTMF Module (1 max.) X 0.005 =
2-wire Detector Heads [ ] X
[ ]
1
1. Refer to the Device Compatibility Document for 2-wire smoke detector standby current.
=
4-wire Detector Heads [ ] X
[ ]
1
=
Power Supervision Relays
2
2. Must use compatible listed Power Supervision Relay.
[ ] X 0.025 =
Current Draw from TB2
(nonalarm
3
)
3. The total standby current must include both the resettable (TB2 Terminals 3 & 4) and nonresettable (TB2
Terminals 1 & 2) power. Caution must be taken to ensure that current drawn from these outputs during
alarm does not exceed maximum ratings specified (see Table A-2 ).
=
Sum Column for Standby Load = amps
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