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Calculating the System Current Draw
Table 7.3 contains three columns for calculating current draws. For maximum output current avail-
ability per circuit and per panel, refer to Section 1.2, "Specifications", on page 15. For each col-
umn, calculate the current and enter the total (in amperes) in the bottom row. When finished, copy
the totals from Calculation Column 2 and Calculation Column 3 to Table 7.4 on page 138.
Calculation Column 1
Device Type
Primary, Non-Fire Alarm Current
Qty
Main Circuit
Board
SFP-5UD
or
1
SFP-10UD
N-CAC-5X
[
]
4XTM
[
]
1 max.
ANN-SEC card
[
]
1 max.
N-ANN-80(C)
[
]
N-ANN-I/O
[
]
N-ANN-RLY
[
]
3
N-ANN-(R)LED
[
]
N-ANN-S/PG
[
]
2-wire Detector
[
]
Heads
4-wire Detector
[
]
Heads
Power
[
]
Supervision
6
Relays
NAC #1
NAC #2
NAC #3
NAC #4
Current Draw
from TB9
(nonalarm)
Sum each
7
Primary Non-Alarm =
column
for
totals
1 If using the Reverse Polarity Alarm output, add 0.005 amps; if using the Reverse Polarity Trouble output, add
another 0.005 amps.
2 The current draw shown represents one zone (IDC) on the main circuit board in alarm. One zone consumes
0.040 amps.
3 An N-ANN-LED is supplied standard with the SFP-5UDC and SFP-10UDC.
4 Refer to the Device Compatibility Document for standby current.
5 Enter the number of IDCs used minus one.
6 Must use compatible listed Power Supervision Relay.
7 Total current draw listed above cannot exceed 3.25 amps for the SFP-5UD(E), 7.25 for the SFP-5UDC, and
7.28 for the SFP-10UD(C/E).
SFP-5UD & SFP-10UD Series Manual— P/N 52879:C2 1/24/2012
Secondary, Fire Alarm Current
(amps)
X[current
Total
Qty
draw]=
X[0.110]=
1
X[0.133]=
X[0.001]=
[
X[0.005]=
[
1 max.
X[0.003]=
[
1 max.
X[0.037]=
[
X[0.035]=
[
X[0.015]=
[
X[0.028]=
[
X[0.045]=
[
4
X[
]
=
[
4
X[
]
=
[
X[0.025]=
[
[
[
[
]=
Table 7.3 System Current Draw Calculations
Calculation Column 2
(amps)
X [current draw]
Total
=
1, 2
X[0.214]
=
1, 2
X[0.282]
=
]
X[0.001]=
1
]
X[0.011]
=
]
X[0.003]=
]
X[0.040]=
]
X[0.200]=
]
X[0.075]=
]
X[0.068]=
]
X[0.045]=
5
]
X[0.040]=
5
]
X[0.040]=
]
X[0.025]=
]
X[
]=
]
X[
]=
[
]=
Secondary Alarm =
Power Supply Calculations
Calculation Column 3
Secondary, Non-Fire Alarm
Current
(amps)
X[current
Qty
Total
draw]=
X[0.110]=
1
X[0.133]=
[
]
X[0.001]=
[
]
X[0.005]=
1 max.
[
]
X[0.003]=
1 max.
[
]
X[0.015]=
[
]
X[0.035]=
[
]
X[0.015]=
[
]
X[0.028]=
[
]
X[0.045]=
4
[
]
X[
]
=
4
[
]
X[
]
=
[
]
X[0.025]=
[
]=
Secondary Non-Alarm =
137
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