Appendix B: Worksheets
Vigilant VS1 and VS2 Technical Reference Manual 205
Notification appliance voltage drop calculation
worksheet
The notification appliance voltage drop calculation worksheet is used to calculate the
voltage drop of your NAC circuits over the distance of the wire you are using.
NAC 1 voltage drop calculations
Circuit length
Total circuit
current [2]
Wire resistance
per 1000 ft [1]
Voltage
drop
feet x amps
x Ω
1000 =
Panel
voltage
Voltage
drop
End of line
voltage [3]
Voltage
drop
Panel
voltage
Voltage
drop %
19.8 V –
=
19.8 V =
NAC 2 voltage drop calculations
Circuit length
Total circuit
current [2]
Wire resistance
per 1000 ft [1]
Voltage
drop
feet x amps
x Ω
1000 =
Panel
voltage
Voltage
drop
End of line
voltage [3]
Voltage
drop
Panel
voltage
Voltage
drop %
19.8 V –
=
19.8 V =
NAC 3 voltage drop calculations
Circuit length
Total circuit
current [2]
Wire resistance
per 1000 ft [1]
Voltage
drop
feet x amps
x Ω
1000 =
Panel
voltage
Voltage
drop
End of line
voltage [3]
Voltage
drop
Panel
voltage
Voltage
drop %
19.8 V –
=
19.8 V =
NAC 4 voltage drop calculations
Circuit length
Total circuit
current [2]
Wire resistance
per 1000 ft [1]
Voltage
drop
feet x amps
x Ω
1000 =
Panel
voltage
Voltage
drop
End of line
voltage [3]
Voltage
drop
Panel
voltage
Voltage
drop %
19.8 V –
=
19.8 V =
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