AMPS-24 Manual —
P/N 51907:J2 02/26/2014
43
Calculating the System Current Draws
Power Supply Calculations
4.1.3 Calculating the Maximum Secondary Power Non-Fire Alarm
Current Draw
Use the table below to determine the maximum current requirements of the secondary power
source during non-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 4.4 to determine the
size of the batteries needed for the fire alarm system.
Results taken from the table below assume that, while in a non-fire alarm condition, batteries must
feed the AMPS-24 (and any additional supplies) with the maximum rated power each supply can
provide.
4.1.4 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 4.4 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 AMPS-24 (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 4.1, col 3
=
Additional Load
[ ]
X
=
Sum Column for Secondary Non-Fire Alarm Load =
Table 4.2 Maximum Secondary Power Non-Fire Alarm Current Draw
Device
Quantity
Alarm
Current
(in amps)
Total
Current/Type
Alarm Current, from Table 4.1, col 2
=
Additional Load
[ ]
X
=
Sum Column for Secondary Fire Alarm Load =
Table 4.3 Maximum Secondary Power Fire Alarm Current Draw
