Johnson Controls METASYS IFC-1010 Hardware Installation page 48

Maximum Use Table 6 to determine the maximum current requirements of the
Secondary
secondary power source during fire alarm conditions. The total obtained in
Power Fire
Table 6 is the amount of current that the batteries must be capable of
Alarm Current
supplying. This figure will be used in Table 7 to determine the size of the
Draw
batteries needed to support five minutes of fire alarm operation.
It is presumed, in a fire alarm condition, that the batteries must feed the
main power supply and any additional supplies (APS-6R, AA-30,
AA-30E, AA-100E, AA-120, and AA-120E) with the maximum rated
power each supply can provide (Table 6).
Note: Due to the maximum rating of 9 amperes imposed when using
Table 6: Maximum Secondary Power Fire Alarm Current Draw
48 Hardware Installation—Installing the IFC-1010/2020
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PS-12250 batteries, it may be necessary to calculate the exact
requirements of the secondary supply. In that case, add the
secondary non-fire alarm load obtained in Table 5 to the total fire
alarm current draw of all notification appliances in the system and
substitute that figure in Table 6 for the MPS and any APS-6R.
Device Type Number in Alarm
(simultaneously)
Main Power
Supply
(MPS-24A or
MPS-24AE)
APS-6R
AA-30 or AA-30E
AA-100 or
AA-100E
AA-120 or
AA-120E
Sum Column for Secondary Fire Alarm Load* =
* The secondary fire alarm load cannot exceed 9.0 amperes with PS-12250 batteries,
and 20 amperes with PS-12550 batteries.
Multiply by
1 X
[ ] X
[ ] X
[ ] X
Current Total Current
(amperes)
6.0 6.0
3.0
7.3
Amperes