What is a ground fault interrupter?

Answer: an electrical shock prevention device.

• GFI electrical outlets and breakers constantly monitor the power flowing through them; the devices can sense a .5 millivolt change in current and shut off the power to the outlet.
• The National Electric Code requires that all residences shall have GFCI Protection in Bathrooms, Kitchens, Unfinished Basements, Garages, Outdoor Outlets and all other areas that water is or may be present. Detailed guidelines of installation locations can be found in the National Electric Code.
• Be careful replacing GFCI outlets, if they are wired incorrectly the "Test" button may work but power can still be flowing through the outlet.