Final answer:
When testing AFCIs and GFCIs, it is recommended to use the test button on the breaker to ensure they are functioning correctly and providing necessary protection against electrical fires and electrocution.
Step-by-step explanation:
When testing Arc Fault Circuit Interrupters (AFCIs), as when testing Ground Fault Circuit Interrupters (GFCIs), it is recommended by the manufacturers to use the test button on the breaker. This feature is built into the breaker to simulate a fault condition, allowing you to verify the proper working of the device. It is essential for ensuring that the AFCI can detect arc faults, which are unintentional electrical discharges that can occur when insulation is worn, as shown in Figure 10.45(a). Similarly, in the case of GFCIs, pressing the test button should help ensure that the device will trip to prevent electrocution when a person comes into contact with a faulty appliance where the grounding may be compromised, as depicted in Figure 10.45(b).
Importance of GFCIs and AFCIs
GFCIs and AFCIs are critical safety devices that help prevent electrical fires and electrocution. GFCIs specifically protect against ground faults by detecting imbalances in electrical current, while AFCIs protect against arc faults which are sparks that can result from damaged or deteriorated wires and connections. Using the test button helps ensure that these protective devices are functional and can provide the necessary protection.