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Calculating the System Current Draw
Table 6.2 contains two columns for calculating current draws. For each column, calculate the current and enter the total (in amps) in the
bottom row. When finished, copy the totals from Calculation Column 1 and Calculation Column 2 to Table 6.3 on page 80.
Device Type
NFC-50/100 Primary Console
(Not including speaker load)
NFC-BDA-25/70V
Optional Audio Amplifier Module
NFC-CE6 Speaker Circuit Expander
NFC-LOC Local Operator Console
NFC-RM Remote Microphone
NFC-RPU Remote Page Unit
NFC-50DA, NFC-125DA, NFC-50/100DA
Remote Amplifiers
NFC-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
Notifier FirstCommand Series Manual — P/N LS10001-001NF-E:H 1/8/2018
Secondary (Battery) Power Source
Qty
[
1
(1 max.)
[
(1 max.)
2
[
2
[
2
[
[
3
[
[
4
[
[
[
Secondary Standby:
Table 6.2 System Current Draw Calculations
Calculation Column 1
Standby Current (amps)
X [current draw] =
1
X [0.272]=
0.272
]
X [0.100]=
[
]
X [0.020]=
[
]
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]=
[
Power Supply Calculations
Calculation Column 2
Secondary (Battery) Power Source
Alarm Current (amps)
total
Qty
X [current draw] =
1
X [0.446]=
]
[
]
X [0.235]=
(1 max.)
]
[
]
X [0.189]=
(1 max.)
]
[
]
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]=
Secondary Alarm:
total
0.446
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
]=
[
]
]=
[
]
[
]
[
]
[
]
79
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