Edwards Signaling FSC Series - Manual (Page 81)

Appendix A: System calculations
FSC Series Technical Reference Manual 73
Notification appliance voltage drop
calculation
NAC 1 voltage drop calculations
Circuit
length
Total
current [1]
Wire resistance
per 1000 ft [2]
Voltage
drop
ft  A  Ω  1000 = V
Panel
voltage [3]
Voltage
drop
End of line
voltage [4]
Voltage
drop
Panel
voltage
[4]
% of
voltage
drop
V  V = V V  V =
NAC 2 voltage drop calculations
Circuit
length
Total
current [1]
Wire resistance
per 1000 ft [2]
Voltage
drop
ft  A  Ω  1000 = V
Panel
voltage [3]
Voltage
drop
End of line
voltage [4]
Voltage
drop
Panel
voltage
[4]
% of
voltage
drop
V  V = V V  V =
NAC 3 voltage drop calculations
Circuit
length
Total
current [1]
Wire resistance
per 1000 ft [2]
Voltage
drop
ft  A  Ω  1000 = V
Panel
voltage [3]
Voltage
drop
End of line
voltage [4]
Voltage
drop
Panel
voltage
[4]
% of
voltage
drop
V  V = V V  V =
NAC 4 voltage drop calculations
Circuit
length
Total
current [1]
Wire resistance
per 1000 ft [2]
Voltage
drop
ft  A  Ω  1000 = V