Calculating the System Current Draw
6.3.2 How to use Table 6.2 to calculate system current draws
1.
Enter the quantity of devices in both columns.
2.
Enter the DC current draw where required. Refer to the Fire•Lite Device Compatibility
Document for compatible devices and their current draw.
3.
Calculate the current draws for each in both columns.
4.
Sum the total current for each column.
5.
Copy the totals from Column 1 and Column 2 to Table 6.3 on page 98.
Following are the types of current that can be entered into Table 6.2:
Calculation Column 1 - The standby current load that the audio panel must support (from
the batteries) during a non-fire alarm condition and a loss of AC power.
Calculation Column 2 - The alarm current draw that the audio panel must support (from
the batteries) during a fire alarm condition and a loss of AC power
Table 6.2 contains two columns for calculating current draws. For each column, calculate the cur-
rent and enter the total (in amps) in the bottom row. When finished, copy the totals from Calcula-
tion Column 1 and Calculation Column 2 to Table 6.3 on page 98.
Device Type
ECC-50/100 Primary Console
(Not including speaker load)
ECC-50W-25/70V
Optional Audio Amplifier Module
ECC-CE6 Speaker Circuit Expander
ECC-LOC Local Operator Console
ECC-RM Remote Microphone
ECC-RPU Remote Page Unit
ECC-50DA, ECC-125DA, ECC-50BDA
3
Remote Amplifiers
ECC-FFT Firefighter Telephone
Speakers (50 watts maximum/amplifier)
1/4 Watt
1/2 Watt
3/4 Watt
1 Watt
2 Watts
Additional Current Draw from TB17 Special
Application Auxiliary Power Output
(0.5 amp maximum)
NAC Circuit Output (2.0 amps maximum)
Power Supervision Relays
AIM-1A, RSM-1A Isolators
SP-SVC Volume Control
Sum each column for totals
1 In backup configurations, the optional amplifier draws no additional current in alarm.
2 Maximum combined total of eight (8) operator interface devices.
3 Maximum combined total of eight (8) remote amplifiers.
4 Must use a compatible, UL-listed Power Supervision Relay
Emergency Command Center Manual — P/N LS10001-000FL-E:G 5/3/2016
Calculation Column 1
Secondary (Battery) Power Source
Standby Current (amps)
Qty
1
[
]
1
(1 max.)
[
]
(1 max.)
2
[
]
2
[
]
2
[
]
[
]
[
]
[
]
4
[
]
[
]
[
]
Secondary Standby:
Table 6.2 System Current Draw Calculations
Secondary (Battery) Power Source
X [current
total
Qty
draw] =
X [0.272]=
0.272
1
[
X [0.100]=
[
]
(1 max.)
[
X [0.020]=
[
]
(1 max.)
X [0.085]=
[
]
[
X [0.050]=
[
]
[
X [0.050]=
[
]
[
X [0.012]=
[
]
[
X[0.120]=
[
]
[
[
[
[
[
[
X [
]=
[
]
[
[
X [0.025]=
[
]
[
X [0.0145]=
[
]
[
X[0.010]=
[
]
[
Secondary Alarm:
Power Supply Calculations
Calculation Column 2
Alarm Current (amps)
X [current draw]
total
=
X [0.446]=
0.446
]
X [0.235]=
[
]
]
X [0.189]=
[
]
]
X [0.100]=
[
]
]
X [0.064]=
[
]
]
X [0.068]=
[
]
]
X [0.012]=
[
]
]
X[0.230]=
[
]
]
X[0.017]=
[
]
]
X[0.033]=
[
]
]
X[0.050]=
[
]
]
X[0.068]=
[
]
]
X[0.132]=
[
]
]
X [
]=
[
]
]
X [
]=
[
]
]
X [0.025]=
[
]
]
X [0.0145]=
[
]
]
X[0.010]=
[
]
97
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