Most of these gasketed plastic NEMA enclosures have been tested and approved to UL508-4x specifications, with a few being approved to UL50-4x. All plastic NEMA enclosures meet NEMA 1, 4, 4x and IEC529-IP66 requirements, which allows them to be used in many wet, dirty and/or corrosive environments. The NBA series plastic NEMA enclosures also come with an optional clear cover, allowing for easy inspections. Select a NBA series plastic NEMA enclosure model.