What is the typical testing procedure for a circuit breaker?

The typical testing procedure for a circuit breaker includes both a functional test and a visual inspection. This comprehensive approach is crucial for ensuring that the circuit breaker operates correctly and safely under normal operating conditions.

A functional test involves simulating the conditions under which the circuit breaker would operate, such as introducing a load or trip condition to verify its ability to open and close properly. This testing checks for the performance of the breaker, confirming that it trips at the correct current levels and resets properly afterward.

The visual inspection component ensures that there are no physical signs of damage or wear, such as cracked housing, burnt contacts, or loose connections. This is important because even if a breaker passes functional tests, it may still pose safety risks if there are visible defects that could lead to failure.

The other options provided do not encompass a suitable testing procedure. Visual inspection alone would fail to ensure the breaker operates correctly under load. Similarly, conducting only a voltage measurement or checking wiring integrity without encompassing the operational characteristics of the breaker would not provide a complete assessment of its functionality and safety.