UL 1446-2016
UL Standard for Safety Systems of Insulating Materials – General (Seventh Edition; Reprint with Revisions Through and Including February 4@ 2019)

Standard No.

UL 1446-2016

Release Date

2016

Published By

Underwriters Laboratories (UL)

Status

Be replaced 2017-06

Replace By

UL 1446 BULLETIN-2017

Latest

UL 1446-2020

Scope

These requirements cover test procedures to be used in the evaluation of Class 120(E) or higher electrical insulation systems (EIS) where the thermal factor is the dominating aging factor. These requirements also cover the investigation of the substitution of non-electrical insulating materials (NIM) components of insulation in a previously evaluated insulation system and also the test procedures to be used in the evaluation of magnet wire coatings@ magnet wires@ and varnishes. These requirements for the evaluation of an EIS do not establish thermal ratings for/or alter established thermal ratings for individual components. These requirements do not cover insulation systems exposed to radiation or operating in oils@ refrigerants@ soaps@ or other media that potentially degrade insulating materials. When any performance aspect of an end-product requirement is not covered by this standard@ the applicable standard shall be used. These requirements do not cover electrical insulation systems where transient overvoltages or partial discharge are present. Such electrical insulation systems shall be evaluated to the appropriate standard for the application. Such standards include@ but are not limited to the following: a) The Test Procedure for Thermal Evaluation of Insulation Systems for Dry-Type Power and Distribution Transformers@ Including Open-Wound@ Solid-Cast@ and Resin-Encapsulated Transformers@ IEEE C57.12.60; b) The Standard for Rotating Electrical Machines ?C Part 18-31: Functional Evaluation of Insulation Systems ?C Test Procedures for Form-Wound Windings ?C Thermal Evaluation and Classification of Insulation Systems Used in Rotating Machines@ IEC 60034-18-31; or c) The Recommended Practice for Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric Machinery Employing Form-Wound Pre-Insulated Stator Coils for Machines Rated 15 000 V and Below@ IEEE 1776.

UL 1446-2016 history

• 1970 UL 1446-2020 UL Standard for Safety Systems of Insulating Materials - General COMMENTS DUE: December 2, 2007
• 2019 UL 1446 BULLETIN-2019 UL Standard for Safety Systems of Insulating Materials - General (COMMENTS DUE: MARCH 15@ 2019)
• 2019 UL 1446-2019 Systems of Insulating Materials - General
• 2018 UL 1446 BULLETIN-2018 UL Standard for Safety Systems of Insulating Materials - General (COMMENTS DUE: December 24@ 2018)
• 2017 UL 1446 BULLETIN-2017 UL Standard for Safety Systems of Insulating Materials - General (COMMENTS DUE: JULY 17@ 2017)
• 2016 UL 1446-2016 UL Standard for Safety Systems of Insulating Materials – General (Seventh Edition; Reprint with Revisions Through and Including February 4@ 2019)
• 2015 UL 1446 CRD-2015 UL Standard for Safety Systems of Insulating Materials - General - Section / Paragraph Reference: Section 1 - Subject: Electrical Insulation Systems - Higher Voltage Applications (Edition 6: February 8, 2007)
• 2015 UL 1446 BULLETIN-2015 UL Standard for Safety Systems of Insulating Materials - General (COMMENTS DUE: JANUARY 25@ 2016)
• 2014 UL 1446 BULLETIN-2014 UL Standard for Safety Systems of Insulating Materials - General
• 2011 UL 1446 BULLETIN-2011 UL Standard for Safety Systems of Insulating Materials – General (COMMENTS DUE: March 14@ 2011)
• 2010 UL 1446 BULLETIN-2010 SUMMARY OF TOPICS The following changes in requirements to the Standard for Systems of Insulating Materials – General, UL 1446, are being proposed for preliminary review and comment only
• 2009 UL 1446 BULLETIN-2009 UL Standard for Safety Systems of Insulating Materials - General (COMMENTS DUE: December 03@ 2009)
• 1970 UL 1446 BULLETIN-2008 UL Standard for Safety Systems of Insulating Materials - General COMMENTS DUE: December 2, 2007
• 2007 UL 1446 BULLETIN-2007 UL Standard for Safety Systems of Insulating Materials - General COMMENTS DUE: December 2, 2007
• 2007 UL 1446-2007 UL Standard for Safety Systems of Insulating Materials - General Sixth Edition; Reprint with Revisions through and Including January 30, 2008.
• 2004 UL 1446 BULLETINS-2004 3/4/2004 (24p)
• 2001 UL 1446 BULLETIN-2001 UL Standard for Safety Systems of Insulating Materials – General
• 2000 UL 1446 BULLETIN-2000 UL Standard for Safety Systems of Insulating Materials – General
• 1997 UL 1446-1997 UL Standard for Safety Systems of Insulating Materials - General (Fifth Edition; Reprint with Revisions Through and Including August 19@ 2004)
• 1994 UL 1446-1994 Systems of insulating materials, general