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Breaker Size Calculator
Minimum and next standard breaker size with NEC 210.20 continuous load rule
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Load Parameters
Continuous = energized for 3+ consecutive hours · NEC 210.20(A)
Results
Minimum Standard Breaker Size
20A
Base Load
15.0A
Required (×1.25)
18.8A
Min Wire (75°C Cu)
12 AWG Cu
Standard Breaker Sizes — NEC 240.6(A)
15A20A25A30A35A40A45A50A60A70A80A90A100A110A125A150A175A200A225A250A300A350A400A
NEC 210.20(A): Branch circuit rating ≥ non-continuous load + 125% of continuous load
NEC 210.19(A)(1): Conductor ampacity ≥ branch circuit rating for multi-outlet circuits
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