We currently have two styles of Slim downlights in our warehouse. We are phasing out the metal junction boxes. Metal J-Boxes are conductive and require a ground wire to prevent electric shock in the case of accidental leakage.Our new style of recessed Slim LED includes a durable plastic J-Box. Plastic is not conductive, so it’s safe to touch and a ground wire is not required. This is why UL and ETL certifications have no ground wire design requirements for plastic electronic equipment.