Disclaimer: RacewayIQ is an informational engineering tool only. All calculations must be independently verified by the user. Do not rely on these results as the sole basis for design, procurement, installation, construction, permitting, or code compliance decisions.
Voltage drop and maximum distance
Voltage Drop Calculator
Live voltage drop, load voltage, maximum distance, and conductor upsizing recommendations using K-factor or impedance data.
Project and Circuit Inputs
Advanced Settings
Optional fields may be left blank for a standard estimate. Blank power factor defaults to 1.0, and blank temperature uses the base conductor data without temperature correction.
Conductor Sizing
| Conductor | Max distance | CM area | Selected |
|---|---|---|---|
| 14 AWG | 39.9 ft | 4,110 | |
| 12 AWG | 63.3 ft | 6,530 | Current |
| 10 AWG | 101 ft | 10,380 | |
| 8 AWG | 160 ft | 16,510 | |
| 6 AWG | 254 ft | 26,240 | |
| 4 AWG | 405 ft | 41,740 |
Suggested upsizing
8 AWG copper
3.37 V drop, 2.81%, load voltage 116.6 V
6 AWG copper
2.12 V drop, 1.77%, load voltage 117.9 V
4 AWG copper
1.33 V drop, 1.11%, load voltage 118.7 V
Voltage Drop Calculation
Formula
VD = (2 x K x I x D) / CM
Substitute values
VD = (2 x 9.28 x 20 x 150.0) / 6530
Conductor construction: stranded. Resistance factor applied: 1.020x.
Result
Voltage Drop = 8.53 V
Voltage Drop % = 7.11%
Voltage at Load = 111.5 V
Maximum allowable one-way distance = 63.3 ft