What is the purpose of testing GFCI receptacles?

The primary purpose of testing Ground Fault Circuit Interrupter (GFCI) receptacles is to ensure proper function. GFCI receptacles are designed to detect ground faults—situations where electrical current is leaking to the ground, which can pose serious safety risks, including electric shock or fire. By regularly testing these devices, you confirm that they will shut off the electrical circuit when they detect a ground fault, which is essential for protecting users in potentially hazardous environments, especially in wet areas like kitchens and bathrooms.

The proper function test assesses whether the GFCI can detect a fault and respond appropriately by cutting off power, thereby preventing harm. Testing does not primarily focus on checking voltage levels, verifying grounding, or enhancing circuit performance, as those aspects pertain to different types of electrical safety checks and assessments unrelated to the specific function of GFCIs.