Allowable Voltage: Drop

If you have a 120V circuit and you calculate a drop of 3.6V: $$ (3.6 / 120) \times 100 = 3% $$ This is right on the limit of allowable drop.

[ V_d = \sqrt3 \times I \times (R\cos\theta + X\sin\theta) \times L ] Where: allowable voltage drop

To determine the allowable voltage drop, you need to consider the following factors: If you have a 120V circuit and you calculate a drop of 3

Copper is a better conductor than aluminum and will experience less voltage drop for the same size wire. How to Calculate It To find the voltage drop ( Vdcap V sub d allowable voltage drop