Table of Contents
Calculating the System Current Draw
Calculation Column 2 - The primary supply current load that the control panel must support during a fire alarm condition, with
AC power applied.
Calculation Column 3 - The standby current drawn from the batteries in a non-fire alarm condition during a loss of AC power.
Table 7.3 contains three columns for calculating current draws. For maximum output current availability per circuit and per panel, refer
to Section 1.2, "Specifications", on page 13. For each column, 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 112.
Device Type
Main Circuit
Board
SFP-5UD
or
SFP-10UD
N-CAC-5X
4XTM
ANN-SEC card
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
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:C6 6/12/2018
Calculation Column 1
Primary, Non-Fire Alarm Current
(amps)
X[current
Qty
draw]=
1
X[0.110]=
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]=
[
]=
Primary Non-Alarm =
Table 7.3 System Current Draw Calculations
Calculation Column 2
Secondary, Fire Alarm Current
(amps)
X [current draw]
Total
Qty
=
1, 2
1
X[0.214]
1, 2
X[0.282]
[
]
X[0.001]=
1
[
]
X[0.011]
1 max.
[
]
X[0.003]=
1 max.
[
]
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
Total
Qty
draw]=
=
1
X[0.110]=
=
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]=
[
]
X[
[
]
X[
[
]
X[0.025]=
[
Secondary Non-Alarm =
Total
4
]
=
4
]
=
]=
111
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