NFS2-640/E Installation Manual — P/N 52741:P2 7/10/14 67
Calculating the System Current Draws Power Supply Calculations
Results taken from Table A.3 below assume that, while in a fire alarm condition, batteries must
feed the main power supply (and any additional supplies such as the APS-6R and AA-30) with the
maximum rated power each supply can provide.
Device Quantity
Current
(in amps)
Total Current/Type
Alarm Current, from Table A.2, col 2 =
APS-6R
*
* Actual load current may be used in place of maximum rated supply
current. To calculate actual load current, sum the current draws for each
appliance connected to APS-6R supplies.
[] X 6 =
APS2-6R [ ] 6 =
AA-30
†
† Exclude Amplifiers that are employed for backup.
[] X 3 =
AA-120 [ ] X 7.3 =
Sum Column for Secondary Fire Alarm Load =
Table A.3 Maximum Secondary Power Fire Alarm Current Draw
NOTE: The Secondary Fire Alarm Load cannot exceed the following:
12 A with BAT-12260 batteries (12 V, 26 AH).
20 A with BAT-12550 batteries (12 V, 55 AH).
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