Appendix B: Worksheets
200 P/N 3102351-EN • REV 005 • ISS 28DEC18
Notification appliance voltage drop calculation
worksheet
Use the notification appliance voltage drop calculation worksheet to calculate the voltage drop
of your NAC circuits over the distance of your wire.
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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