NEMA TC 9-2020

NEMA TC 9-2020 defines general requirements, including materials, trade sizes, dimensions and workmanship for the following types of fittings for PVC plastic utilities duct used for underground installation of communications and electrical wire and cable: EB, designed for encased burial in concrete when installed in trenches underground, and DB, designed for direct burial in trenches underground without a requirement for encasement in concrete.