UL-1990 Complete Document History
Standard for Nonmetallic Underground Conduit with Conductors

Complete Current Edition:
   4TH EDITION - Standard for Nonmetallic Underground Conduit with Conductors - May 10, 2023
   CHANGE 01/24 - CHANGE NOTICE - CODE A - Jan. 3, 2024

Obsolete Revision Information:
   CHANGE 04/16 - REVISION CHANGE - CODE B - April 15, 2016
   3RD EDITION - Standard for Nonmetallic Underground Conduit with Conductors - Nov. 22, 2013
   CHANGE 10/11 - REVISION CHANGE - CODE B - Oct. 6, 2011
   2ND EDITION - NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - Aug. 18, 2005
   1ST EDITION - NONMETALLIC UNDERGROUND CONDUI - April 30, 1998