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Installation
2.1.9 Calculating Current Draw and Standby Battery
This section helps determine the current draw and standby battery needs for your installation (18
Ampere Hours maximum will fit in cabinet). Complete the remaining instructions in Table 2.2.
For batteries larger than 18 AH, use the BB-26 or BB-55FBattery Box. A maximum of 35 Ampere
Hours is allowed per system.
Device
ECC-125DA
ECC-CE4
A
Notification Devices
B
C Total current rating of all devices in system (Line B) X .001
D Number of standby hours (24 or 60 for NFPA 72)
E Multiply line C (standby current) and D:
F Alarm sounding period in hours (For example, 5 minutes = .0833 hours):
G Multiply line C (alarm current) and F:
H Add lines E and G (AH = Ampere Hours):
ECC-50/125DA Instruction Manual — P/N LS10027-000FL-E:D 5/21/2015
No. of
Current Per Device
Devices
Standby:
1
Alarm:
Standby:
0 or 1
Alarm (All Channels):
Refer to device manual for number of devices and current ratings.
Table 2.2 Current Draw Calculations
firealarmresources.com
ECC-125DA Remote Amplifier
Standby
Current
375 mA
375 mA
700 mA
20 mA
180 mA
Current Subtotals:
mA
Current Subtotals:
mA
Total standby AH
AH
Total alarm AH
Total AH required
AH
Alarm
Current
700 mA
mA
mA
mA
A
A
H
H
AH
25
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