Edwards Signaling eFSA250 User Manual
Page 233
Appendix B: Worksheets
E-FSA64 and E-FSA250 Technical Reference Manual
221
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
=