Final answer:
To test GFCI protection, use a GFCI tester on any receptacle downstream, which will confirm the proper functioning of the device by tripping the circuit if a leakage current is simulated.
Step-by-step explanation:
To properly test that GFCI protection exists for any receptacle down line of a GFCI protection device, you should use a GFCI tester. This device simulates a ground fault by creating a small current leakage between the live/hot and ground wires, ensuring that the GFCI device is functioning correctly by tripping the circuit. When using the tester, insert it into the receptacle and press the test button. If the GFCI is working properly, it will trip, indicating that protection is active. It is important to reset the GFCI device after testing.
A GFCI works by comparing currents in the live/hot and neutral wires, and trips the circuit if it detects a leakage current greater than 5 mA. Regular testing with a GFCI tester ensures that this safety mechanism is operational, providing protection against electrical shock hazards potentially caused by faults in downstream receptacles.