This utility model relates to a composite outer cover for an electrical box. The outer cover includes a steel outer shell and a plastic inner liner. The steel outer shell includes an inwardly recessed cavity and a
flange extending outward along the opening of the cavity. The plastic inner liner is laminated within the cavity of the steel outer shell and connected to the
flange. The composite outer cover for an electrical box provided by this utility model is composed of a steel outer shell and a plastic inner liner, possessing both the excellent structural strength,
weather resistance, and
fire resistance of the steel outer shell, and the insulating properties of the plastic inner liner, which reduces the likelihood of short circuits in electrical components, thus meeting new industry electrical standards.