kVA Tools – Voltage Drop Calculator
Calculate voltage drop for single-phase and three-phase circuits using either the Impedance (R–X) Method or the NEC (K·I·L/CM) Method. See Documentation.
Input
| Common Parameters | Conductor Material | |
| Conductor Size | ||
| Length (one way) |
|
|
| Supply Type | ||
| Temperature |
|
|
| Supply Voltage* | ||
| Load Current (A) |
*For three-phase systems, enter line-to-line voltage e.g., 480V, not 277V
| Impedance Method Parameters | Resistance (Ω) | |
| Reactance (Ω) | ||
| Cable Type | ||
| Grouping | ||
| Conduit Material | ||
| Power Factor |
Reactance Estimation: When R and X are left at 0, reactance is estimated using simplified assumptions. For critical designs or final engineering calculations, manually enter measured or tabulated R and X values from manufacturer data sheets or IEEE Std 141 Tables 4A-7, 4A-8.
Output – Results
| Parameter | Value | Unit |
|---|---|---|
| Voltage Drop | — | V |
| Percentage Drop | — | % |
| Receiving Voltage | — | V |