NEMA has published NEMA TC 14-2015 series of standards: NEMA TC 14.AG-2015 Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings, NEMA TC 14.BG-2015 Belowground Reinforced Thermosetting Resin Conduit and Fittings, and NEMA TC 14.XW-2015 Extra Heavy Wall Aboveground Reinforced Thermosetting Resin Conduit and Fittings. Standards are adoptions of UL 2515, UL 2420, and UL 2515A respectively. They separate requirements for RTRC and fittings to align with these UL standards.