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Power Supply Calculations
Table 7.3 contains columns for calculating current draws. 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 161.
Calculation Column 1
Primary, Non-Fire Alarm Current
Device Type
(amps)
Qty
Main Circuit Board
1
ACM-8R
[
]
ACM-16AT
[
]
ACM-32A
AEM-16AT
[
]
AEM-32A
AFM-16AT
[
]
AFM-32A
AFM-16A
[
]
[
]
UDACT
1 max.
LDM-32
[
]
LDM-E32
[
]
FDU-80
[
]
4XTM
[
]
4-wire Detector Heads
[
]
Power Supervision
[
]
6
Relays
NI-100
[
]
NP-100
[
]
NP-100T
[
]
NH-100
[
]
NH-100R
[
]
ND-100
[
]
NDM-100
[
]
ND-100R
[
]
NMM-100
[
]
NMM-100P
[
]
NZM-100
[
]
NOT-BG12LX
[
]
NC-100
[
]
NC-100R
[
]
N-100ISO
[
]
7
NAC #1
NAC #2
NAC #3
NAC #4
Current Draw from TB3
8
(nonalarm
)
9
Sum each column
for totals
Primary Non-Alarm =
1 All eight ACM-8R relays activated on a single module.
2 All annunciator LEDs on
3 LDM-32 with LEDs on
4 If using the Reverse Polarity Alarm output, add 0.005 amps; if using the Reverse Polarity Trouble output, add
another 0.005 amps.
5 Refer to the Device Compatibility Document for standby current.
6 Must use compatible listed Power Supervision Relay.
7 Current limitation of Terminal TB3 & TB4 circuits is 2.5 amps per NAC.
8 The total standby current must include both the nonresettable/resettable (TB1 Terminals 1 & 2) and resettable
(TB1 Terminals 3 & 4) power. Caution must be taken to ensure that current drawn from these outputs during
alarm does not exceed maximum ratings specified. Current limitations of TB3 & TB4 circuits is 2.5 amps per
NAC output and 0.5 amps per special application auxiliary power output
9 Total current draw listed above cannot exceed 6.0 amps.
160
Table 7.3 System Current Draw Calculations
Calculation Column 2
Primary, Fire Alarm Current
(amps)
X[current draw]=
Total
Qty
X[0.300]=
0.300
1
X[0.030]=
[
X[0.040]
[
X[0.002]
[
X[0.040]
[
X[0.025]
[
X[0.040]
[
X[0.040]
[
X[0.002]
[
X[0.064]
[
X[0.005]=
[
5
[
X[
]
=
X[0.025]=
[
X[0.00030]=
X[0.00030]=
X[0.00030]=
X[0.00030]=
X[0.00030]=
X[0.00030]=
X[0.00075]=
X[0.00030]=
X[0.00040]=
X[0.000375]=
X[0.00027]=
X[0.00023]=
X[0.00039]=
X[0.00027]=
X[0.00045]=
[
[
[
[
[
]=
[
Primary Alarm =
Calculating the System Current Draw
X [current draw] =
Total
X[0.325]=
0.325
1
]
X[0.158]
=
2
]
X[0.056]
=
2
]
X[0.018]
=
2
]
X[0.056]
=
2
]
X[0.065]
=
]
X[0.075]=
3
]
X[0.056]
=
]
X[0.018]=
]
X[0.064]=
4
]
X[0.011]
=
]
X[
]=
]
X[0.025]=
maximum alarm draw
0.400
for all devices
]
X[
]=
]
X[
]=
]
X[
]=
]
X[
]=
]
[
]=
FireWarden 100-2/E — P/N 52778:A 11/04/2005
Calculation Column 3
Secondary, Non-Fire Alarm Current
(amps)
Qty
X[current draw]=
Total
1
X[0.255]=
0.255
[
]
X[0.030]=
[
]
X[0.040]=
[
]
X[0.002]=
[
]
X[0.040]=
[
]
X[0.025]=
[
]
X[0.040]=
[
]
X[0.040]=
[
]
X[0.002]=
[
]
X[0.025]=
[
]
X[0.005]=
[
]
X[
]=
[
]
X[0.025]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00030]=
[
]
X[0.00075]=
[
]
X[0.00030]=
[
]
X[0.00040]=
[
]
X[0.000375]=
[
]
X[0.00027]=
[
]
X[0.00023]=
[
]
X[0.00039]=
[
]
X[0.00027]=
[
]
X[0.00040]=
[
]
[
]=
Secondary Non-Alarm =
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