44 — ElectriCalc Pro
Finding Voltage Drop Wire Size
A 20 Amp, three-phase 208 Volt load will
be located 175 Feet away from the
source. Assuming a 3% allowable Voltage
drop, what is the size of 75°C conductor
required for this branch circuit?
Steps
Keystrokes
Display
Clear calculator
o o
0.
Set to 75°C
S 7
3Ø 75 Cu 0.
Enter Amps
2 0 A
AMPS 20.
Enter Volts
2 0 8 U
VOLT 208.
Enter distance
1 7 5 l
FEET 175.
Enter allow. VD%
3 v
DROP 3.0 V %
Find wire size
w
AWG 8 CU
VD WIRE SIZE
Find actual
Voltage drop
v
DROP 4.7 V
Find % v.drop
v
DROP 2.3 V %
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