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Appendix D: Power Supply and Battery Calculations
* 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 Appendix A for other compatible
smoke detectors.
Total Current Requirement:ALARM (B)______ Amps. (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 FA-300 Series. Indicating Circuits must not to exceed 5
amperes.
Battery Selection: Multiply (C) by 1.20 to derate battery.
RAM-208/216 Remote Annunciator X 0.035
= 0.090/0.140 =
RTI-1
Remote Trouble
Indicator
X0.035
=0.035 =
Two-Wire Smoke Detectors X 0.00011
= * 0.090 = 0.090
Four-Wire Smoke Detectors X
= =
Signal Load (bells, horns, strobes, and
etc.)
X
=
Auxiliary Power Supply for Annunciators, etc.
=
=
Total cu rr en ts (A dd abo ve currents )
STANDBY
(A)ALARM (B)
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