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Appendix D: Power Supply and Battery Calculations
14.0 Appendix D: Power Supply and
Battery Calculations
Use the form below to determine the required main chassis and secondary power supply
(batteries).
Total Current Requirement
ALARM (B)______ Amps.
Battery Capacity Requirement
(
[STANDBY (A) ______ ] X [(24 or 60 Hours) ___ ]) + ([ALARM (B) ______ ] X [
♣
Alarm in Hr.] _____) = (C) ______AH
Main Chassis Selection
Select MCC-1024-6(SA) if (B) is less than 12 Amps.
Battery Selection
Multiply (C) by 1.20 to derate battery.
Batteries: BA-110 (10AH) and BA-117(17AH) will fit in the BB-1024
BA-124(24AH) and BA-140(40AH) will fit in the BB-1072
* Assuming three initiating circuits in alarm.
♣
Use 0.084 for five minutes of alarm or 0.5 for thirty minutes of alarm as a multiplier figure.
♦
Using the MIR-525/U 2-wire smoke detector. See LT-1007 for other available smoke detectors.
IMPORTANT NOTICEIMPORTANT 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 13.0 Appendix C:
Specifications on page 75 for specifications.
Power Requirements (All currents are in amperes)
Model Number Description Qty Standby
Total
Standby
Alarm
Total
Alarm
MCC-1024-6(S) Main Chassis (6 amp) X 0.200 = 0.350 =
MCC-1024-12(S) Main Chassis (12 amp) X 0.200 = 0.350 =
MCC-1024-6ADS Main Chassis (6 amp) X 0.200 = 0.350 =
MCC-1024-12ADS Main Chassis (12 amp) X 0.200 = 0.350 =
ECH-1048
Expander Chassis (48 Circuit
Displays)
X 0.200 = 0.020 =
DM-1008A 8 initiating circuit Module X 0.080 = 0.100 =
RM-1008A 4 indicating circuit Module X 0.035 = 0.150 =
UDACT-300A Digital Communicator Mod. X 0.045 = 0.120 =
PR-300 City Tie Module X 0.035 = 0.300 =
Two-Wire Smoke Detectors
♦
0.0001
= * 0.090 = 0.090
Four-Wire Smoke Detectors X = =
Signal Load (bells, horns, strobes, and etc.)
=
Auxiliary Power Supply for Remote Annunciators Alarm =
Total currents (Add above currents) STANDBY (A) (B)
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