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Circuit Breaker Size Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Формула
Breaker Size = Load Watts / Voltage × 1.25 (125% NEC rule)
Водич корак по корак
- 1Calculate total load in watts, divide by voltage, multiply by 1.25
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Инпут
2400W load, 120V circuit
Резултат
Breaker = 2400/120 × 1.25 = 25A → use 30A breaker
Common Mistakes to Avoid
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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