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Calculating the System Current Load
Device Type
1
Main Circuit Board
IPOTS-COM Communicator
CELL-MOD/CAB-N
PWRMOD24
N-ANN-80
N-ANN-100
N-ANN-(R)LED
N-ANN-RLY
N-ANN-I/O
N-ANN-S/PG
NFC-FFT
4XTM
4-wire Detector Heads
4
Power Supervision Relays
NI-100, FSI-851
NP-100, NP-200,
FSP-851, FSP-951
NP-100T, NP-200T,
FSP-851T, FSP-951T
NP-A100, FAPT-851
NH-100, NH-200,
FST-851, FST-951
NH-100R, NH-200R,
FST-851R, FST-951R
NH-100H, NH-200H,
FST-851H, FST-951H
ND-100, FSD-751PL
ND-100R, FSD-751RPL
5
B501BH, B501BHT
B224RB Relay Base
B224BI Isolator Base
NMM-100
XP10-M
NDM-100, FDM-1
NMM-100P, FMM-101
NZM-100 ,FZM-1
NZM-100-6, XP6-MA
NOT-BG-12LX, NBG-12LX
NC-100, FCM-1
XP6-C
NC-100R, FRM-1
XPR-6
N-100ISO, ISO-X
ISO-6
FWSG
7
NAC #1
7
NAC #2
7
NAC #3
7
NAC #4
FCPS (remote sync)
Current Draw from TB3
Sum each column for totals AC Powered,
1
Main board with display only.
2
If using the Reverse Polarity Alarm output, add 0.005 amps; if using the Reverse Polarity Trouble output, add another 0.005 amps.
3
Refer to the Device Compatibility Document for standby current.
4
Must use compatible listed Power Supervision Relay.
5
Maximum alarm current for each sounder base is 0.015 amps which must be supplied by aux. 24VDC source.
6
When powered by an external source, use 0.040A. When powered by the SLC, use 0.024A.
7
If using Gentex brand NACs, the max number of devices for each NAC output is 35. The "UL Max" current rating, published in their data sheets, must be
used in order to maintain performance under low battery conditions with the maximum wire resistances shown in Table D.2 on page 143.
8
Total Alarm current load cannot exceed 3.0 amps or 6.0 amps only when the PWRMOD24 option module is installed.
NFW-100X Manual — P/N LS10131-001NF-E:C 7/25/2018
Calculation Column 1
Primary (AC) Power Source
Fire Alarm Current (amps)
Qty
X[current draw]=
[
]
X[0.041]=
[
]
X[0.100]=
N/A
[
]
X[0.040]=
[
]
X[0.025]=
[
]
X[0.068]=
[
]
X[0.075]=
[
]
X[0.200]=
[
]
X[0.045]=
N/A
2
[
]
X[0.011]
=
[
]
X[
]=
[
]
X[0.025]=
maximum alarm draw
for all devices =
[
]
X[
]=
[
]
X[
]=
[
]
X[
]=
[
]
X[
]=
[
]
X[0.02]=
[
]
[
]=
8
Fire Alarm Load
=
Table 9.3 System Current Load Calculations
Calculation Column 2
Secondary (Battery) Power Source
Fire Alarm Current (amps)
Total
Qty
X [current draw]=
1
X[0.257]=
[
]
X[0.041]=
[
]
X[0.100]=
[
]
X[0.008]=
[
]
X[0.040]=
[
]
X[0.025]=
[
]
X[0.068]=
[
]
X[0.075]=
[
]
X[0.200]=
[
]
X[0.045]=
[
]
X[0.230]=
[
]
X[0.011]=
3
[
]
X[
]
[
]
X[0.025]=
maximum alarm draw
0.400
for all devices =
[
]
X[
]=
[
]
X[
]=
[
]
X[
]=
[
]
X[
]=
[
]
X[0.0217]=
[
]
[
]=
Battery Powered,
9
Fire Alarm Load
=
Power Supply Calculations
Calculation Column 3
Secondary (Battery) Power Source
Standby Current (amps)
Total
Qty
X [current draw]=
1
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
[
]
=
[
]
[
]
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
[
]
X[0.00050]=
[
]
X[0.00045]=
0.400
[
]
X[0.00040]=
[
]
X[0.00350]=
[
]
X[0.00075]=
[
]
X[0.000375]=
[
]
X[0.00027]=
[
]
X[0.00200]=
[
]
X[0.00030]=
[
]
X[0.00039]=
[
]
X[0.00225]=
[
]
X[0.00027]=
[
]
X[0.00145]=
[
]
X[0.00040]=
[
]
X[0.00045]=
[
]
X[0.040] or [0.024]
[
]
Battery Powered,
Standby Load
Total
X[0.141]=
X[0.040]=
X[0.055]=
X[0.007]=
X[0.015]=
X[0.020]=
X[0.028]=
X[0.015]=
X[0.035]=
X[0.045]=
X[0.120]=
X[0.005]=
X[
]=
X[0.025]=
X[0.001]=
6
[
]=
10
=
129
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