Voltage Regulation Calculator
Calculate line voltage regulation and power losses.
ANSI C84.1 Voltage Limits
| Range | Service | Utilization |
|---|---|---|
| Range A (Normal) | +/- 5% | -8.3% to +4.2% |
| Range B (Emergency) | +/- 5.8% | -11.7% to +5.8% |
Regulation Formula
VR% = (Vs - Vr) / Vr × 100
Vdrop = I × (R×cosθ + X×sinθ)
Voltage Regulation Guidelines
Typical Limits
- NEC branch circuits: 3% max
- NEC feeders: 2% recommended
- Combined: 5% total max
- Motor circuits: 3% (NEC 430.6)
- Sensitive equipment: 2%
Improvement Methods
- Increase conductor size
- Use parallel conductors
- Reduce line length
- Improve power factor
- Add voltage regulators