Testing a Ground Fault Circuit Interrupter

A ground fault circuit interrupter is very simple to test. There are 2 buttons on the GFCI that can be pressed, and the results of pressing those buttons will determine whether the circuit is live, and whether the GFCI is working properly. Before you being, identify the circuit breaker in your panel box that corresponds with the GFI being tested.

Step 1: Check the Breaker

In the panel box, check the breaker for the GFCI in question. A "tripped" breaker is usually pointed at almost a 90 degree angle in relation to the panel, and may move freely back forth a slight bit. Turn the breaker to the off position, and then turn it back on again. If the breaker immediately trips off, you have a direct short somewhere in that circuit. Disconnect any appliances that are plugged in and test the break again, and if the problem still exists, begin checking the wiring itself.

Step 2: Check the Appliances

It is far more likely that a bulb in your lamp will burn out before a GFCI will go bad. If you do not power to the receptacle, check the devices connected to it before you get too involved in other testing. If you find frayed or worn cords, they may be causing the GFCI to trip. repair or replace cords as needed. Even if it doesn't fix the GFCI problem, it will increase the home safety level dramatically.

Step 3: Check the GFCI

On the face of a GFCI receptacle are two buttons, usually red and white, but sometimes red and blue. The red button is the GFI reset, and the white button is the test. If the reset button seem to protrude farther out than the test button, it may have tripped. Press the red button in firmly, and it will lightly snap into the on position. Press the test button, and the reset button will be pushed outward, turning off the circuit. The rule is: if the red button is poking out, the circuit has tripped.

Step 4: Replace the GFCI

If all of your tests seem indicate a bad GFCI receptacle, replace it. Remove the screws which hold on the face plate and you will see two more screws, one at the top and another at the bottom. Turn off the circuit breaker in the panel before proceeding. Remove the two retaining screws, and gently pull the receptacle straight out. Note the position of the wires, and install a replacement GFCI in the same manner.

Step 5: Why GFCI is Important

GFCI receptacles and switches are used in areas with a higher than normal danger of moisture in the air. This includes all outdoor receptacles, and any receptacles used in the kitchen, bathroom, or laundry. If you have a partially enclosed porch or patio, it is a good idea to use GFCI receptacles there as well. GFCI's are intended to increase the safety of electrical usage in places that might otherwise be considered dangerous, and serve as a means of reducing potential electrocution.