Best Calculators
Recommended Learning Path
- Estimate or measure the load current.
- Use one-way conductor length and resistance per 1000 ft.
- Compare voltage drop percentage to project criteria.
- Check ampacity and protection separately.
Related Guides
Common Mistakes
- Entering round-trip length when the calculator expects one-way length.
- Ignoring conductor temperature or AC reactance on larger feeders.
- Using voltage-drop criteria as a substitute for ampacity checks.
Limitations and Assumptions
The voltage-drop calculator is a resistance-based estimate. Long AC runs, large conductors, harmonics, and unusual layouts may require impedance-based analysis.