"These requirements cover Schedule 40 and Schedule 80 extruded rigid PVC (polyvinyl chloride) electrical conduit and fittings consisting of elbows and other bends made from and for use with this conduit. They also cover couplings@ adapters@ expansion joints@ and similar fittings that are constructed of rigid PVC. The designations ""Schedule 40"" and ""Schedule 80"" 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 both heavy-wall and thin-wall rigid PVC conduit@ elbows@ and other bends in accordance with the National Electrical Code (NEC)@ NFPA 70. The following restrictions apply to use of the PVC conduit and fittings mentioned in 1.1: a) Use at 50??(122?? and lower ambient temperatures b) Use with 75??(167?? wiring@ but the conduit and fittings may be used with 90??(194?? wiring if they comply with the construction (see Conduit for Use with 90??Wire@ Section 17) and marking (see 26.3@ 26.7@ and 26.8) requirements covering use 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. Schedule 40 rigid PVC conduit and fittings are for aboveground use indoors or outdoors exposed to sunlight and weather@ and for underground use by direct burial or encasement in concrete. Schedule 40 rigid PVC conduit@ elbows@ and other bends that are specifically marked for underground use are suitable for use underground only by direct burial or encasement in concrete. Schedule 80 rigid PVC conduit and fittings are for use wherever Schedule 40 rigid PVC conduit may be used and are for installation on poles in accordance with the National Electrical Code. Type EB and Type A 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 Type EB and A Rigid PVC Conduit and HDPE Conduit@ UL 651A. Unless the wording of a requirement specifically limits the requirement to Schedule 40 or to Schedule 80@ each requirement in this standard applies to both schedules. 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. Reinforced thermosetting resin conduit and associated fittings are covered separately in the Standard for Reinforced Thermosetting Resin Conduit (RTRC) and Fittings@ UL 1684. 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. Rigid PVC conduit and fittings are inherently resistant to the corrosive influences of common industrial atmospheres including the vapors and mists of bases@ hydrofluoric and chromic acids@ and pickling and plating baths. Resistance to wetting by and immersion in reagents is covered in Resistance to Specific Reagents@ Section 18@ 26.5@ 26.6@ and section 44. In addition to the requirements specified in Sections 1 ?C19 and Section 25@ rigid PVC conduit for directional boring is intended to be subjected to the performance requirements specified in Sections 20 ?C24 of this standard. The expansion joints covered by these requirements are fittings intended to compensate for linear thermal expansion of a span of rigid polyvinyl chloride (PVC) conduit. Couplings covered by these requirements are fittings intended for joining: a) Two lengths of rigid PVC conduit@ b) A length of rigid PVC conduit to a rigid PVC elbow or other bend@ and c) In conjunction with a junction-box adapter@ a length of rigid PVC conduit or a rigid PVC elbow or other bend to a box. Junction-box adapters covered by these requirements are fittings intended to connect a length of rigid PVC conduit @ a PVC elbow or other bend to a rigid PVC box (not limited to junction boxes) with a coupling. Internally-threaded adapters covered by these requirements are fittings intended for joining a length of rigid PVC conduit@ a PVC elbow or other bend to threaded rigid metal conduit or other externally-threaded devices. Externally-threaded adapters (also referred to as terminal adapters) covered by these requirements are fittings intended for joining a length of rigid PVC conduit or elbow or other bend to: a) The knockout area of a metal box with a metal locknut@ b) A threaded metal hub or fitting on a metal box@ c) A threaded hub on a phenolic box@ or d) A knockout in a phenolic box. Reducers covered by these requirements are fittings intended for joining lengths of two different sizes of rigid PVC conduit. Caps covered by these requirements are fittings intended for closing the ends of unused lengths of rigid PVC conduit. Bell ends covered by these requirements are fittings intended to provide a bushed opening at the open end of a length of rigid PVC conduit. "
UL 651 BULLETIN-2011 history
1970UL 651-2022 Schedule 40 and 80 rigid PVC conduit and Fittings
2019UL 651 BULLETIN-2019 UL Standard for Safety Schedule 40@ 80@ Type EB and A Rigid PVC Conduit and Fittings (COMMENTS DUE: August 26@ 2019)
2018UL 651 BULLETIN-2018 UL Standard for Safety Schedule 40@ 80@ Type EB and A Rigid PVC Conduit and Fittings (COMMENTS DUE: May 11@ 2018)
2014UL 651 CRD-2014 UL Standard for Safety Schedule 40@ 80@ Type EB and A Rigid PVC Conduit and Fittings - Section/Paragraph Reference: Paragraphs 1.1.1@ 1.2.5@ 5.1.1@ 5.4. 5.4.1@ 5.4.1.1@ 5.4.1.2@ 5.4.1.3@ 5.4.2@ 5.4.3 and 9.2.4; Sections 7.4 and 7.5; Table 7.4; Figure 7.6
2014UL 651 BULLETIN-2014 UL Standard for Safety Schedule 40@ 80@ Type EB and A Rigid PVC Conduit and Fittings (COMMENTS DUE: MARCH 31@ 2014)
2012UL 651 BULLETIN-2012 UL Standard for Safety Schedule 40@ 80@ Type EB and A Rigid PVC Conduit and Fittings (COMMENTS DUE: FEBRUARY 20@ 2012)
2011UL 651 BULLETIN-2011 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (COMMENTS DUE: JULY 11@ 2011)
2011UL 651-2011 Schedule 40, 80, Type EB and A rigid PVC conduit and fittings
2009UL 651 BULLETIN-2009 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (COMMENTS DUE: NOVEMBER 12@ 2009)
2008UL 651 BULLETIN-2008 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (COMMENTS DUE: JANUARY 31@ 2008)
2007UL 651 BULLETIN-2007 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (COMMENTS DUE: APRIL 23@ 2007)
2006UL 651 BULLETINS-2006 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (10/06/2006 (2p); 07/28/2006 (4p); 05/12/2006 (4p))
2005UL 651 BULLETIN-2005 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings
2005UL 651-2005 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (Seventh Edition; Reprint with revisions through and including March 11@ 2010)
2004UL 651 BULLETINS-2004 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit and Fittings (06/25/2004 (4p); 03/19/2004 (36p))
1995UL 651-1995 UL Standard for Safety Schedule 40 and 80 Rigid PVC Conduit (Sixth Edition; Reprint with Revisions Through and Including June 02@ 2005)
1989UL 651-1989 Schedule 40 and 80 rigid PVC conduit