UL 1004-9:2018 pdf download.Form Wound and Medium Voltage Rotating Electrical Machines.
7 lnsulation Systems
7.1 Insulation systems shall comprise materials that have been shown by service life experience or testto have suitable thermal endurance when operating at the temperature limit declared. Compliance shallbe demonstrated by one of the following methods:
a) lnsulation systems without suitable field experience may be used provided the insulationsystem in question(candidate system) complies with Procedure C- Single-point thermal ageingtest in lEC 61858 - Part 2: Electrical insulation systems -Thermal evaluation of modifications toan established electrical insulation system (EIS) - Part 2: Form-wound EIS,when tested againsta system previously found to be acceptable for service at the rated temperature class;
b) A modified or a new insulation system complying with the requirements of lEC 60034-18-31,Part 18-31: Functional evaluation of insulation systems -Test procedures for form-wound
windings - Thermal evaluation and classification of insulation systems used in rotatingmachines;
c) For form wound machines rated 15,000 v or less, using IEEE 1776,Recommended Practicefor Thermal Evaluation of Unsealed or Sealed Insulation Systems for AC Electric MachineryEmploying Form-Wound Pre-Insulated Stator Coils for Machines Rated 15000 V or Below, isconsidered to meet the intent of this requirement or
d)The manufacturer's declaration with supporting documents such as test reports to
established standards and documentation of machines using the materials with service lifeexperience reports.
