Voltage Drop Three Phase
Three Phase Voltage Drop
This calculation is one which is important if a load is 208 volt and more
than 150 feet from the source of power, and also important if the load is 240
volt and more than 200 feet from the course of power.
The algebra formula for voltage drop is:
Vd = (1.732 X k X I X L) divided by cm
X means times
Vd equals voltage drop in volts
1.732 is for there and back of a three phase circuit
k is the constant calculated by R times cm divided by 1000
I is the actual current the load will draw
L is the distance in feet the load is located from the source
Note: The formulas are identical for single phase and three phase voltage
drop with the single exception that for single phase the factor is 2 in the
formula and for three phase the factor is 1.732 or the square root of 3.
Find practice problems HERE.
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