Power Supply Calculations
Calculating the Battery Size
130
IQ-301 PN 50036:F 10/29/2001
Table 47 System Current Draw Calculations
(Part 2)
A.5 Calculating the Battery Size
Use Table 48 to calculate the total Standby and Alarm load in ampere hours (AH). This
total load determines the battery size (in AH), required to support the control panel
under the loss of AC power. Complete Table 48 as follows:
1. Enter the totals from Table 47 Calculation Columns 2 and 3 where shown.
2. Enter the NFPA Standby and Alarm times (refer to “NFPA Battery Requirements”
below.)
3. Calculate the ampere hours for Standby and Alarm; then, sum the Standby and
Alarm ampere hours.
4. Multiply the sum by the derating factor of 1.2 to get the proper battery size (in
ampere hours).
5. Write the ampere-hour requirements on the Protected Premises label located inside
Row Category
Calculation Column 1
Primary, Non-Fire Alarm Current
(amps)
Calculation Column 2
Primary, Fire Alarm Current
(amps)
Calculation Column 3
Secondary, Non-Fire Alarm
Current (amps)
Qty
X [current draw]=
total
Qty
X [current draw]=
total
Qty
X [current draw]=
total
SUBTOTALS FROM PREVIOUS PAGE
11
SLC Communication Loop
B501BH (Horn in base)
CMX-2 (relay/NAC)
FCM-1 (Supervised NAC)
DHX-501
DHX-502
FZM-1 (IDC) (SLC Current)
CPX-551
CPX-751
FSI-751
ISO-X
NBG-12LX (with FSM-101)
BGX-101L (with MMX-101)
FMM-1 (IDC)
FMM-101 (IDC)
MMX-1 (IDC)
MMX-2 (IDC)(SLC current)
MMX-101 (IDC)
IPX-751
FSP-751T
FSP-751
HPX-751
SDX-551
SDX-751
SDX-551TH
SDX-751TH
FRM-1
FDX-551 and FDX-551R
XP5-M
XP5-C (Relay)
XP5-C (NAC/Telephone)
FST-751
B524RB
B524BI
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x [0.00100]=
X 0.00030
X 0.00030
X 0.00020
X 0.00020
X 0.00020
X 0.00020
X 0.00020
X 0.00027
X 0.00045
X 0.00030
X 0.00030
X 0.00030
X 0.00030
X 0.00030
X 0.00020
X 0.00030
X 0.00035
X 0.00027
X 0.00027
X 0.00029
X 0.00020
X 0.00029
X 0.00020
X 0.00029
X 0.00020
X 0.00020
X 0.001651
X 0.000840
X 0.001481
X 0.00027
X 0.00050
X 0.00050
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x [0.01500]=
X 0.00030
X 0.00030
X 0.00020
X 0.00020
X 0.00020
X 0.00020
X 0.00020
X 0.00027
X 0.00045
X 0.00030
X 0.00030
X 0.00030
X 0.00030
X 0.00030
X 0.00020
X 0.00030
X 0.00035
X 0.00027
X 0.00027
X 0.00029
X 0.00020
X 0.00029
X 0.00020
X 0.00029
X 0.00020
X 0.00020
X 0.003000
X 0.000840
X 0.001481
X 0.00027
X 0.00050
X 0.00050
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x [0.00100]=
X 0.00030
X 0.00030
X 0.00020
X 0.00020
X 0.00020
X 0.00020
X 0.00020
X 0.00027
X 0.00045
X 0.00030
X 0.00030
X 0.00030
X 0.00030
X 0.00030
X 0.00020
X 0.00030
X 0.00035
X 0.00027
X 0.00027
X 0.00029
X 0.00020
X 0.00029
X 0.00020
X 0.00029
X 0.00020
X 0.00020
X 0.001651
X 0.000840
X 0.001481
X 0.00027
X 0.00050
X 0.00050
12
CHG-120
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x [0.060]=
13
Optional modules
RTM-8 (Note 4)
4XTM
Municipal Box (Note 5)
Reverse Polarity Outputs used
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x [ 0.0010]=
x [ 0.0110]=
N/A
x [ 0.0050]=
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x [ 0.160]=
x [ 0.020]=
x [ ]=
x [ 0.0050]=
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x [ 0.0010]=
x [ 0.0110]=
N/A
x [ 0.0050]=
14
Compatible Devices not listed above
(Note 3)
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x [ ]=
x [ ]=
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x [ ]=
x [ ]=
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x [ ]=
x [ ]=
15
Sum each column for totals
Primary non-alarm:
(1.0 A max.):
Primary alarm (5.0 A max): Copy to
Table 48 “Secondary Alarm Load”
Secondary alarm:
Copy to Table 48 “Secondary
Standby load”
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