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Jak vypočítat Circuit Breaker Sizing

Co je Circuit Breaker Sizing?

Circuit Breaker Size Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.

Vzorec

Breaker Size = Load Watts / Voltage × 1.25 (125% NEC rule)

Průvodce krok za krokem

  1. 1Calculate total load in watts, divide by voltage, multiply by 1.25
  2. 2Apply the formula using your project measurements
  3. 3Add required safety factors or waste allowances per code

Worked Examples

Vstup
2400W load, 120V circuit
Výsledek
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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