Electrical Breaker Sizing Calculator
- Current
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- With 125% factor
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- Min breaker size
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NEC 210.20: branch-circuit overcurrent protection ≥ 125% of continuous loads + 100% non-continuous.
About this tool
Electrical Breaker Sizing Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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