What type of circuit breakers are common for general-purpose circuits?

The choice of 15- or 20-ampere circuit breakers is accurate for general-purpose circuits because these ratings are designed to safely handle common household loads, such as lighting and receptacle circuits. In residential wiring, 15-ampere breakers are typically used for lighting circuits, while 20-ampere breakers are often employed for circuits that supply power to outlets that may carry heavier loads, such as kitchen appliances or power tools.

Using these amperage ratings allows these circuits to effectively manage normal electrical demand without tripping unnecessarily, while also providing protection against overloads and potential fire hazards. Choosing a circuit breaker that matches the application helps ensure that the wire gauge used in the circuit is adequate to prevent overheating, which is also essential for safety and compliance with electrical codes.