997-532-000-1, Issue 1
March 2006
36
EN54 & ISO 7240 2-8 Zone Conventional Fire Panel - Installation & Configuration Manual
9
Battery Calculation
The table in Section 6.4.1 Standby Batteries can be used
to select the correct battery size. If full calculations are
required use the procedure below.
General Data
PSU size
Maximum
Maximum
Internal
No. of sounder
External
Battery Size
Circuits
Alarm Load
Range
1.8A
2
1A
1.6 - 7Ah
Standby Load (Amps)
Standby Load in Amps
No.
Current
Total
Basic panel
1
0.034
0.034
Device quiescent current
(max 2mA per zone)
EOL Current (per zone) -
0.0056
fitted with Resistor EOL
Auxiliary equipment *
Total Standby Load (L1)
Peak/ Alarm Load (Amps)
Standby Load in Amps
Qty
Current
Total
Basic panel
1
0.034
0.034
Zones alarm current
2/ 4/ 8
0.03
Optional 2-way Relay PCB
0/ 1
0.04
Optional 8-way Relay PCB(s)
0/ 1/ 2
80.1
Sounder output 1
Sounder output 2
Auxiliary equipment *
Total Alarm Current (L2)
Total <1.8A
Calculation
C
min
=
1.25 {(L1 x T
1
) + (2 x L2 x T
2
)}
=
1.25 x .................................. A
=
........................................... Ah
Next available battery ........................... Ah
T
1
= Standby time in hours, e.g. 24, 72, etc.
T
2
= Alarm time in hours.
This formula calculates the battery capacity required to
provide the specified standby period plus half-hour alarm
load in accordance with BS5839 Part 1 and LPS1014.
*
Ensure that any current taken from
the Auxiliary output through the relay
circuits are included in the ‘Auxiliary
equipment’ boxes for alarm and
quiescent.
Summary of Contents for EN54
Page 41: ......
