Circuit Breaker Sizing Calculator — Formule
## Circuit Breaker Sizing
**Amps = Watts / Volts**
**Continuous load: multiply by 1.25** per NEC 210.20(A). Then round up to the next standard breaker size (15A, 20A, 30A, 40A, 50A, etc.).
**Amps = Watts / Volts**
**Continuous load: multiply by 1.25** per NEC 210.20(A). Then round up to the next standard breaker size (15A, 20A, 30A, 40A, 50A, etc.).
Exemple Résolu
2,400W continuous load on 120V.
- Amps = 2400 / 120 = 20A
- Design amps = 20 x 1.25 = 25A
- Next standard size = 25A, or use 30A breaker