Load Parameters
kW
V
leading/lagging
OCPD Sizing Gauge
Load Current ×125% vs Breaker--%
0%80%100%
Awaiting Input
AC Circuit Analysis
Line Current (I)
--A
Apparent Power (S)
--kVA
Reactive Power (Q)
--kVAR
Phase Angle (θ)
--°
Recommended OCPD (NEC 125%)
--A
Formulas & Code
S = P / PF Q = √(S² - P²)
I = P / (V·PF) (θ = acos(PF))
NEC 210.20(A): Continuous load → OCPD = I × 1.25, next standard size.
Standard breaker sizes: 15,20,25,30,35,40,45,50,60,70,80,90,100A
Power Triangle (kW / kVAR / kVA)
Current Phasor (V reference)