35 AFP-3030 Installation Manual — P/N DOC-01-037:B 25/08/2016
Electrical Specifications Power Supply Calculations
will be drawn from the batteries. Use column 1 in Table A.2 to calculate the Quiescent Load on the
power supply. The alarm or quiescent current must not exceed 15A regardless of which NPS power
supply is connected. Use column 2 in Table A.2 to calculate the additional current needed during
alarm conditions.
A.6.2 How to Use the Calculating Tables
In the following section:
The term “secondary” refers to the system’s backup batteries
The term “primary” is reserved for the NPS’s primary source of power, 240 VAC 50 Hz
The term “standby” refers to the output current required when no fire alarm is present.
The term “alarm” refers to the output current required when a fire alarm is present.
The Primary Quiescent Current and Fire Alarm Current columns are DC current calculations. Use
these calculations to confirm that the NPS can provide enough current to support the system during
Primary Quiescent and Fire Alarm conditions.
Quantities List the number of devices powered by the MAIN 24 V Main Output on the NPS and
any auxiliary 24 V Outputs. Use these quantities to calculate total current draw of each set of
devices in calculation columns 1, 2, and 3.
Calculation Column 1 (Primary, Quiescent Current in amps) Add the contents of
Column 1 to get the current drawn from the NPS during a quiescent condition, with AC power
applied.
Calculation Column 2 (Primary, Fire Alarm Current in amps) Column 2 lets the system
designer determine the current load that the NPS must support during a fire alarm.
Typically, a system should contain capacity to activate all output circuits and relays, and support
fire alarms on no less than 10% of Initiating Device Circuits.
If the system provides power for Notification Appliance Circuits, refer to the Device Compatibility
Document for 24 V DC notification appliances.
NOTE: A current calculation tool can also be found in the Download Centre on the Notifier
website: http://www.notifier.com.au/
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