APPENDIX A
UL S2203
Cheetah Xi 50 Installation Manual
A-1
FM
P/N: 06-369
Rev 6, 09/2015
Power calculations must be completed to determine standby and alarm current loads for the system to assure
that the system power supply is capable of providing the required quantity of power during normal system
operation and fire alarm conditions. The power requirements cannot exceed the capabilities of the system
power supply. Amp-hour requirements must be calculated as well to determine proper back-up battery size
selection.
The following battery calculation form provides the current draw (standby and alarm) of each compatible
device that can be connected to the system. To calculate the required standby and alarm power, as well as
required back-up battery size for the system, simply list the number of each type of device that will be
connected to the system in the quantity column(s) and perform the required calculations.
BATTERY CALCULATION FORM
Section 1 - System Requirements
Item
Description
Standby
Current per
Unit (Amps)
Qty
Total System
Standby
Current per
Unit (Amps)
Alarm
Current per
Unit (Amps)
Qty
Total System
Alarm
Current per
Unit (Amps)
1
10-2622 System Controller (CSC)
0.116
x
1
=
0.116
0.176
x
1
=
0.176
2
Signaling Line Circuits (SLC)
x
1
=
x
1
=
Section 2 Totals
3
Auxiliary Power
x
1
=
x
1
=
Section 3 Totals
[Note 1]
[Note 2 & 3]
4
Notification Circuits
[Note 8]
NA
x
NA
=
NA
x
1
=
Section 4 Totals
[Note 2]
Total System Standby
Current (Amps):
Total System Alarm
Current (Amps):
Max. Quiescent Load (Standby):
hr
Total Alarm Load:
min. x 1/60 =
hr
[Note 4]
[Note 5]
Required
Standby Time
(hr)
Total System
Standby Current
(Amps)
Required
Standby Capacity
(Amp-hr)
Required Alarm
Time (hr)
Total System
Alarm Current
(Amps)
Required Alarm
Capacity
(Amp-hr)
x
=
x
=
Required Standby
Capacity (Amp-hr)
Required Alarm
Capacity (Amp-hr)
Total Required
Capacity (Amp-hr)
Optional Factor of
Safety
Adjusted Battery
Capacity (Amp-hr)
+
=
x
=
[Note 6]
[Note 7]
Notes:
1.
Auxiliary Power cannot exceed 1.75 A in normal standby condition.
2.
Auxiliary Power plus Notification Power cannot exceed 5.25 A.
3.
Auxiliary Power does not include current delivered to SCM during alarm conditions. This current is totaled in Section 4.0 Notification Appliances.
4.
NFPA 72 requires that the secondary power supply have sufficient capacity to operate the system under non-alarm condition for a minimum of 24
hours. Alternate standby times may be required by the local authority or approval agency.
Factory Mutual requires that the secondary Power Supply have sufficient capacity to operate the system under non-alarm condition for the
following systems Standard System 24 hours, Voice Evacuation 24 hours, Pre-Action/Deluge Release 90 hours.
5.
NFPA 72 requires that at the end of the 24 hour standby period, the secondary power supply shall have sufficient capacity to operate all alarm
notification appliances used for evacuation or to direct aid to the location of an emergency for 5 minutes (0.083 hr) standard, 15 minutes for
emergency voice/alarm communication service or UL 2572 mass notification service.
Factory Mutual requires that at the end of the required standby period, the secondary Power Supply shall have sufficient capacity to operate all
alarm notification appliances used for or to direct aid to the location of an emergency for 5 minutes (0.083 hr) standard, 15 minutes for
emergency voice/alarm communication service and 15 minutes Pre-Action/Deluge Release.
6.
1.2 represents a battery derating factor of 20 percent.
7.
Cheetah Xi 50 control panel can support charging up to 75 AH standby batteries.
8.
Section 4.0 shall only include the current draw of notification appliances powered by the Cheetah Xi 50 system controller. This includes the two
on-board notification appliance circuits (NAC 1 & 2).
Summary of Contents for 10-071
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