GFCI receptacles are designed with the safety of the user in mind. In commercial and industrial areas like public bathrooms, breakrooms and food service areas, the NEC(R) requires GFCI receptacles. Arrow Hart self-test GFCI receptacles are UL listed and fully compliant with all of the latest UL943 Class A GFCI and UL498 requirements. The self-test GFCIs conduct an automatic test periodically to ensure GFCI protection. The device will trip and will not reset if GFCI protection is not available. Additionally, GFCIs incorporate a safety lock-out function to protect against miswired line load connections and GFCI circuitry damage.