The NBB Series of NEMA boxes is one of Bud’s most popular enclosures for wet, dirty and/or corrosive environments.. They feature plastic latches and an all-plastic construction. Most of the gasketed enclosures in this series have been tested and approved to UL508-4x specifications, with a few being approved to UL50-4x. All NBB Series enclosures meet IEC529 IP66 requirements.