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Jinsi ya kukokotoa Circuit Breaker Sizing

Circuit Breaker Sizing ni nini?

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

Fomula

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

Mwongozo wa Hatua kwa Hatua

  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

Mifano Iliyotatuliwa

Ingizo
2400W load, 120V circuit
Matokeo
Breaker = 2400/120 × 1.25 = 25A → use 30A breaker

Makosa ya Kawaida ya Kuepuka

  • Not applying code-required safety factors or derating
  • Forgetting to account for waste and cut losses in material estimates

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