Sizing a Circuit Breaker

Circuit breakers are designed to carry 100% of their rated current while the NEC dictates an 80% application. Why the difference? One of the most often asked questions is, "How do I size a circuit breaker?" A commonly misunderstood fact about circuit breakers (CBs) is related to the percentage of loading permitted by the NEC and the CB design, and why the two may be different. Let's investigate both

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