"These requirements cover: a) Type EB and Type A extruded rigid PVC (polyvinyl chloride) electrical conduit and fittings consisting of elbows and other bends made from and for use with these types of conduit. b) Extruded rigid Schedule 40 high-density PE (polyethylene) electrical conduit and the following fittings: 1) Elbows and other bends from and for use with this conduit and 2) Rigid high-density PE couplings for use with this conduit. The designations ""Type EB""@ ""Type A""@ and ""Schedule 40 refer to USA trade sizes of conduit having iron-pipe size outside diameters and specific wall thicknesses. The PVC and PE conduit and fittings mentioned in 1.1 are intended for use at 50??(122?? and lower ambient temperatures. Type A PVC conduit and fittings and Schedule 40 PE conduit and fittings are intended for use with 75??(167?? wiring. Type A and Type EB PVC conduit and fittings@ where encased in concrete in trenches outside of buildings@ may be used with 90??(194?? wiring. Schedule 40 PE conduit and fittings@ where directly buried or encased in concrete in trenches outside of buildings@ may be used with 90??(194?? wiring. The 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. Type EB (encased burial) PVC conduit is intended for encasement in concrete in trenches outside of buildings. Type A PVC conduit is intended for encasement in concrete in any location. Unless the wording of a requirement that applies to PVC conduit and fittings specifically limits the requirement to Type EB or to Type A@ each such requirement in this standard applies to both types. Outlet boxes and covers that are rigid PVC or of 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. Couplings@ adapters@ and similar fittings that are of rigid PVC and are for use with the rigid conduit and fittings covered in these requirements are covered separately in the Standard for Nonmetallic Outlet Boxes@ Flush Device Boxes@ and Covers@ UL 514C. Schedule 40 and Schedule 80 rigid PVC electrical conduit and fittings consisting of elbows and other bends made from and for use with this conduit are covered separately in the Standard for Schedule 40 and 80 Rigid PVC Conduit@ UL 651. Schedule 40@ Schedule 80@ EPEC-A@ and EPEC-B coilable@ smooth-wall continuous length high-density polyethylene electrical conduit are covered separately in the Standard for Continuous Length HDPE Conduit@ UL 651B. The rigid PVC conduit and fittings covered in these requirements are intended to be joined to rigid PVC boxes and fittings in the field by means of a cement that is or contains a solvent for polyvinyl chloride. Schedule 40 high-density PE conduit is for aboveground use where encased in not less than 2 inches (50 mm) of concrete and for underground use by direct burial or encasement in concrete. Deleted September 5@ 2003 A product that contains features@ characteristics@ components@ materials@ or systems new or different from those covered by the requirements in this standard@ and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features@ characteristics@ components@ materials@ or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development@ revision@ and implementation of this standard."