ZP3 Fire Control Panel Installation, Commissioning and Maintenance Manual
REV 11 (ISS 08/03/2010)
Page 51
Use the information provided in Table 5 to calculate the power supply and battery load
capacities. Record the results as shown in Table 6.
Power supply load calculation
Table 6: Power supply load calculation
Description
Calculated load
PSU capacity
Pass
Fail
Quiescent Amperes
L1
1.2 A
Fire alarm Amperes
L2
2.5 A
Notes:
Insert the calculated quiescent load into L1, and the calculated fire alarm load into L2.
Tick "Pass" if the calculated load is below the PSU capacity, otherwise tick "Fail".
Should the ZP3 PSU not be able to supply the system load, then either the system design will need to be
modified, or a separate external power supply used for part of the load.
Battery calculation
If the system must operate in the quiescent state for 24 hours and with a full alarm load for half
an hour, calculate the battery size as follows (see Table 7).
Notes:
Multiply the quiescent load plus the basic panel load by 1.05 (this adds 5%) to obtain the possible extra load
resulting from the panel being in a fault, disabled, or other non-fire condition. Multiply this figure by 24 to
obtain the Ampere/hours needed for 24-hour operation. Insert the result into C1.
Multiply the Fire Alarm Load plus the basic panel load by 0.5, and insert the result into C2.
Add C1 and C2, and insert the result into C3.
Add 25% to C3 to calculate the battery over-rating requirement. This allows for the normal deterioration in
battery performance over the batteries' lifetime.
Select the nearest size battery available, rounding upwards. Remember that the largest battery that can be
accommodated in the ZP3 enclosure is 30 Ampere/Hour.
Table 7: Battery calculation
Description Calculation
Result
No
Standby Ampere/hours
(Quiescent load + 0.3 Amps) x 24 x 1.05
C1
Fire alarm Ampere/hours
(Fire alarm load + 0.5 Amps) x 0.5
C2
Total Ampere/hours
C1 + C2
C3
Battery capacity over-rating (25%)
C3 x 1.25
C4
Nearest size battery
C5
