"General These requirements cover Schedule 40@ Schedule 80@ Type EB and Type A extruded rigid PVC (polyvinyl chloride) electrical conduit and fittings. These requirements also cover elbows@ couplings@ adapters@ expansion joints@ and similar fittings that are constructed of rigid PVC. The designations ""Schedule 40""@ ""Schedule 80""@ ""Type EB""@ ""Type A"" refer to USA trade sizes of conduit having iron pipe-size outside diameters and specific wall thicknesses. Couplings@ adapters@ expansion joints@ and similar fittings are intended to be used with Schedule 40@ Schedule 80@ Type EB and Type A rigid PVC conduit@ elbows@ in accordance with the National Electrical Code (NEC)@ NFPA 70. Rigid PVC conduit and fittings covered in these requirements are intended for use as rigid nonmetallic raceway for wires and cables in accordance with the National Electrical Code (NEC)@ NFPA 70. Conduit bodies (pull boxes) and covers@ flush-device boxes and covers@ and outlet boxes and covers that are constructed of rigid PVC or another nonmetallic material and are for use with the rigid PVC conduit and fittings covered in these requirements are covered separately in the Standard for Nonmetallic Outlet Boxes@ Flush-Device Boxes@ and Covers@ UL 514C. Rigid PVC conduit and fittings covered in these requirements are intended to be joined to each other and to rigid PVC boxes@ conduit bodies@ and fittings in the field by means of a cement that is or contains a solvent for polyvinyl chloride. Unless the wording of a requirement that applies to rigid PVC conduit and fittings specifically limits the requirement to Schedule 40@ Schedule 80@ Type EB or to Type A@ each such requirement in this standard applies to all types. Reinforced thermosetting resin conduit and associated fittings are covered separately in the Standard for Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings@ UL 2515 and the Standard for Belowground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings@ UL 2420."