How Do You Size a Main Breaker?

Answer

To size a main breaker requires one to identify that a circuit breaker is usually sized to operate at no more than 80 percent of its rated capacity. Study that a circuit breaker is designed to carry its rated circuit load under continuous operation for three hours or more. Establish the total electrical load required for the circuit you are sizing. Compute the size of the circuit breaker needed to safely carry the load.
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