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8
2.3 Battery Installation
The diagram opposite shows the
recommended location and orientation
for the 7AH batteries within the panel.
For battery sizes greater than 7AH, the
batteries must be installed in a separate
enclosure suitable for fire protection use
with wiring connected to the panel
through rigid conduit.
Replacement Fuses
FS1
T5A
125V Anti-Surge
FS2
T5A
125V Anti-Surge
2.4 Wiring Installation
Refer to Manual 680-014 for further information.
2.5 Battery Standby Calculation Chart
Use the following charts and associated notes to calculate the size of the batteries required to ensure operation
of the installation in the event of AC Mains power failure.
Quiescent Load
Fire Alarm Load
Equipment
I (A)
x
Total
I (A)
x
Total
Mx-4100S
0.115
1.0
= 0.115
0.225
1.0
= 0.225
Sensor / Loop Current
3
1.25
4
=
1.25
=
Mxp-024 LED Indicator – 20 Zone
0.003
1.0
=
0.012
1.0
=
Auxiliary Supply Output
5
1.0
=
1.0
=
Sounder Output A
1.0
=
Sounder Output B
1.0
=
Total
Quiescent Load
=
Alarm Load
=
x 24 hr =
Ahr
x 48 hr =
Ahr
x 72 hr =
Ahr
x 2
6
x 0.5 hr =
Ahr
(carry forward)
+
Ahr
Total Load (Qui Alarm) =
Ahr
x 1.25
(Battery De-rating factor) =
Ahr
3
Use the detector manufacturers’ technical information to calculate the load on the loop for both the quiescent condition and fire alarm
condition for all loop devices. By default, a maximum of 5 detector / call point LED indicators will be turned on in a fire alarm condition. (This
number can be changed via the PC Programming Tool).
4
The calculated loop loading must be multiplied by a factor of 1.25 to calculate the actual current draw from the batteries. This is to take into
account voltage conversion and conversion efficiency in generating the supply for the loop.
5
Refer to separate data sheets for the additional modules that can be powered from the panel AUX Output to determine the AUX loading
currents. For example, the modules can include Modem, Sounder Splitter, Routing Interface, etc. The sum of all these additional currents
should be entered in these fields.
6
The alarm load should be doubled to allow for changes in battery efficiency for loads in excess of the recommended C/20 discharge rate.
The total load calculated should be multiplied by a de-rating factor of 1.25 to allow for changes in battery efficiency over time. The above
calculation is in accordance with the recommendations in BS5839-1: 2002.
