Voltage Drop

Written by Jerry Ratzlaff on . Posted in Electrical Engineering

Voltage drop, abbreviated as VD, is the electricity between the meter and where it is be used.  It is basically impossible to have no voltage loss.

Voltage Drop formulas

 $$\large{ VD = \frac{2\;Z\;I\;L}{1000} }$$ (single-phase) $$\large{ VD = \frac{1.732\;Z\;I\;L}{1000} }$$ (three-phase)

Where:

 Units English Metric $$\large{ VD}$$ = voltage drop $$\large{V}$$ $$\large{\frac{kg-m^2}{s^{3}-A}}$$ $$\large{Z}$$ = impedance of the conductor (ohms per 1,000 ft) $$\Omega$$ $$\large{\frac{kg-m^2}{s^3-A^2}}$$ $$\large{ I }$$ = load current (amps) $$\large{I}$$ $$\large{\frac{C}{s}}$$ $$\large{ L }$$ = length of conductor from source to load, one-way (feet) $$\large{ft}$$ $$\large{m}$$