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15.0
Appendix D: Power Supply and
Battery Calculations
Use the form below to determine the required secondary power supply (batteries).
IMPORTANT NOTICE
The main AC branch circuit connection for Fire Alarm Control Panel 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 A for specifications.
POWER REQUIREMENTS (ALL CURRENTS ARE IN AMPERES)
Model Number
Description
Fire Alarm
MR-2312-LW
Control Panel, 12 Det,
FIXED ELR/ACTIVE ELR
Fire Alarm Control Panel, 12 Det
MR-2312-LDW/
with UDACT
MR-2312-LDR
FIXED ELR/ACTIVE ELR
Fire Alarm
MR-2308-LW
Control Panel, 8 Det
FIXED ELR/ACTIVE ELR
Fire Alarm Control Panel, 8 Det
MR-2308-LDW
with UDACT
FIXED ELR/ACTIVE ELR
Det Class A Converter Adder
MR-2300-A
Module
Sig Class A Converter Adder
MR-2300-NC4
Module--4 Circuits
Sig Class A Converter Adder
MR-2300-NC2
Module--2 Circuits
Polarity Reversal and City Tie
MR-2300-PR
Module
MR-2312-R12/
12 Relay or 6 Relay Adder
MR-2306-R6
Module
MR-2312-SR12/
12 Relay Smart Relay Module
MR-2312-SW12
MR-2300-LCDR/
Smart Remote Annunciator
MR-2300-LCDW
MR-2306-ATW/MR-
Remote Annunciators
2312-ATW
MR-2300T
Remote Trouble Indicator
Two-Wire Smoke Detectors
Four-Wire Smoke Detectors
Signal Load (bells, horns, strobes, and etc.)
Auxiliary Power Supply for Annunciators, etc.
Total currents (Add above currents)
* Assume three Initiating Circuits are in alarm.
' Use 0.084 for five minutes of alarm as a multiplier figure.
Using the Mircom MPD-65P 2-wire photoelectric smoke detector. See Device Compatibility Guide LT1007SEC.
Total Current Requirement: ALARM (B)______ Amp. (Value obtained from column B)
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 for MR-2300 LED Series. Indicating Circuits must not to exceed 5
Amperes.
Battery Selection: Multiply (C) by 1.25 to derate battery.
102
Qty
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
STANDBY
Standby
Total Standby
0.164/0.104
=
0.164/0.104
=
0.136/0.096
=
0.136/0.096
=
0.000
=
0.000
=
0.000
=
0.050
=
0.000
=
0.030
=
0.056
=
0.035
=
0.035
=
0.00011
=
=
=
(A)
Alarm
Total
Alarm
0.424/0.364
=
0.424/0.364
=
0.366/0.326
=
0.366/0.326
=
0.000
=
0.000
=
0.000
=
0.300
=
0.160/0.080
=
0.140
=
0.065
=
0.090
=
0.035
=
* 0.090
= 0.090
=
=
=
ALARM
(B)
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