Grace Engineered Products Inside Outlet is unique because it has three GFCI-protected receptacles - two outside and one inside the panel. Additionally, this GFCI receptacle's purpose is to provide companies a troublefree step toward complying with NFPA 79, which states all externally-mounted utility receptacles must be GFCI protected and tested every 30 days. Accomplishing this directive is simple and time efficient with . The non-GFCI outlets inside a panel wired through the , which is then externally mounted on the panel door. Now testing is easy! Just walk up to the door, flip the protective cover, and push the button.