Ground Fault Circuit Interrupter
A ground fault circuit interrupter (GFCI), or Residual Current Device (RCD) is a circuit breaker. This device reduces the risk of electric shock. It shuts off an electric power circuit when it detects that current is flowing in a way it is not meant to, such as through water or a person.
Here is how a home inspector will test the GFCI electrical outlets in your home to observe if they are wired correctly and are guarding you against potential electrical shocks. These types of outlets are usually found in the kitchen countertops, bathroom, garage and exterior areas. They also can be installed as the GFCI breakers in the main electrical service panel.