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ECC-50/125DA Instruction Manual —
P/N LS10027-000FL-E:D 5/21/2015
ECC-50BDA Backup Remote Amplifier
Installation
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
No. of
Devices
Current Per Device
Standby
Current
Alarm
Current
ECC-50BDA 25V
1
Standby: 110 mA
110 mA
Alarm: 1.2 A
1.2 A
ECC-50BDA 70.7V
1
Standby: 110 mA
110 mA
Alarm: 1.4 A
1.4 A
ECC-50WBU
1
Standby: 40 mA
40 mA
Alarm: 110 mA
110 mA
A
Current Subtotals:
mA
mA
Notification Devices
Refer to device manual for number of devices and current ratings.
B
Current Subtotals:
mA
mA
C
Total current rating of all devices in system (Line B) X 0.001
A
A
D
Number of standby hours (24 or 60 for NFPA 72)
H
E
Multiply line C (standby current) and D:
Total standby AH
AH
F
Alarm sounding period in hours (For example, 5 minutes = 0.0833 hours):
H
G
Multiply line C (alarm current) and F:
Total alarm AH
AH
H
Add lines E and G (AH = Ampere Hours):
Total AH required
AH
Table 3.3 Current Draw Calculations
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