UL-1004-9:2016 pdf free download – STANDARD FOR SAFETY Form Wound and Medium Voltage Rotating Electrical Machines.
7 Insulation Systems
7.1 Insulation systems shall comprise materials that have been shown by service life experience or test to have suitable thermal endurance when operating at the temperature limit declared. Compliance shall be demonstrated by one of the following methods:
a) Insulation systems without suitable field experience may be used provided the insulation system in question (candidate system) complies with Procedure C — Single-point thermal ageing test in IEC 61858 – Part 2: Electrical insulation systems – Thermal evaluation of modifications to an established electrical insulation system (EIS) – Part 2: Form-wound EIS, when tested against a 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 IEC 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 rotating machines;
c) For form wound machines rated 15,000 V or less, using IEEE 1776, 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 15000 V or Below, is considered 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 life experience reports.
8 Electrical Insulation
8.1 Materials used to support terminals or live parts other than magnet wire shall be constructed of materials that have been shown by experience or test to have suitable thermal and electrical properties suitable for the temperatures measured during intended use. Compliance shall be demonstrated by one of the following methods:
a) Materials have been evaluated and found acceptable in accordance with the applicable requirements covering mechanical and electrical property considerations in the Standard for Polymeric Materials – Use in Electrical Equipment Evaluations, UL 746C;
b) Phenolic, ceramic, porcelain, and cycloaliphatic epoxies are able to be used without additional evaluation;
c) Materials used to support live parts on machines rated 1,000 V or less are considered acceptable when exhibiting flame, volume resistivity, electric strength, Comparative Tracking Index (CTI), High Current Arc Resistance Ignition (HAl), and Hot-Wire Ignition (HWI) properties shown in Table 8.1 and used within established thermal ratings for the temperatures measured during intended use; 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 life experience reports.
9.2 The applied potential is to be gradually increased until the required test value is reached.
9.3 Accessory devices (such as space heaters, thermostats, thermocouples, thermistors, RTDs, ETDs, and the like) in contact with the winding but supplied from a separate circuit, are to be connected to the frame or core during machine winding high-potential tests.
9.4 During the accessory testing, all other machine windings and components shall be connected
together and to the frame or core.