# 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

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

### Where:

$$\large{ VD}$$ = voltage drop

$$\large{ cmil}$$ = conductor cross-section area in circular mil

$$\large{ I }$$ = connected load current (amps)

$$\large{ L }$$ = length of conductor from source to load, one-way (feet)

$$\large{ K }$$ = constant, ohms-cmil per ft