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ECC-50BDA Backup Remote Amplifier
3.2.11 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 3.3.
Batteries larger than 18 AH will not fit in the main control cabinet and must be housed in the BB-26
or BB-55F Battery Box. A maximum of 35 AH is allowed per system.
Device
ECC-50BDA 25V
ECC-50BDA 70.7V
ECC-50WBU
A
Notification Devices
B
C Total current rating of all devices in system (Line B) X 0.001
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 = 0.0833 hours):
G Multiply line C (alarm current) and F:
H Add lines E and G (AH = Ampere Hours):
36
No. of
Current Per Device
Devices
Standby:
1
Alarm:
Standby:
1
Alarm:
Standby:
1
Alarm:
Refer to device manual for number of devices and current ratings.
Table 3.3 Current Draw Calculations
ECC-50/125DA Instruction Manual — P/N LS10027-000FL-E:D 5/21/2015
firealarmresources.com
Standby
Current
110 mA
110 mA
1.2 A
110 mA
110 mA
1.4 A
40 mA
40 mA
110 mA
Current Subtotals:
mA
Current Subtotals:
mA
Total standby AH
AH
Total alarm AH
Total AH required
AH
Installation
Alarm
Current
1.2 A
1.4 A
110 mA
mA
mA
A
A
H
H
AH
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