37 AFP-3030 Installation Manual — P/N DOC-01-037:B 25/08/2016
Electrical Specifications Power Supply Calculations
A.6.4 Calculating the Maximum Secondary Power Quiescent
Current Draw
Use the table below to determine the maximum current requirements of the secondary power
source during quiescent conditions. The result obtained is the amount of current that the batteries
must be able to supply to the fire alarm system. Use the result in Table A.3 to determine the size of
the batteries needed for the fire alarm system.
Results taken from the table below assume that, while in a quiescent condition, batteries must feed
the NPS (and any additional supplies) with the maximum rated power each supply can provide.
A.6.5 Calculating the Maximum Secondary Power Fire Alarm
Current Draw
Use the table below to determine the maximum current requirements of the secondary power
source during fire alarm conditions. The result obtained is the amount of current that the batteries
must be able to supply to the fire alarm system. Use the result in Table A.4 to determine the size of
the batteries needed for the fire alarm system.
Results taken from the table below assume that, while in a fire alarm condition, batteries must feed
the NPS (and any additional supplies) with the maximum rated power each supply can provide.
Device Quantity
Alarm
Current
(in amps)
Total
Current/Type
Alarm Current, from Table A.2, col 3 =
Additional Load [ ] X =
Sum Column for Secondary Quiescent Load =
Table A.3 Maximum Secondary Power Quiescent Current Draw
Device Quantity
Alarm
Current
(in amps)
Total
Current/Type
Alarm Current, from Table A.2, col 2 =
Additional Load [ ] X =
Sum Column for Secondary Fire Alarm Load =
Table A.4 Maximum Secondary Power Fire Alarm Current Draw
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