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Installing the ECS-125W
4.5.6 Calculating Current Draw and Standby Battery
This section helps to determine the current draw and standby battery needs for your installation. These capacities have a built-in 20% derat-
ing factor. Complete the remaining instructions in Table 4.2.
Batteries larger than 18 AH will not fit in the main control cabinet, and must be housed in the RBB Accessory Battery Cabinet. The system
supports a maximum of 33 AH batteries.
ECS-INT50W 25V
ECS-INT50W 70V
A
Current Subtotals:
Notification Devices
B
Current Subtotals:
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):
4.6 Installing the ECS-125W
This section provides information on how to install the ECS-125W for use with ECS series products.
ECS Series Manual — P/N 151455:H 2/15/2022
No. of
Device
Devices
1
1
Refer to device manual for number of devices and current ratings.
Table 4.2 Current Draw Calculations
Current Per Device
Standby:
52 mA
Alarm:
275 mA
Standby:
52 mA
Alarm:
310 mA
Total standby AH
Total alarm AH
Total AH required
ECS Device Installation
Standby
Alarm
Current
Current
52mA
275mA
52mA
310mA
mA
mA
mA
mA
A
A
H
AH
H
AH
AH
35
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