This standard specifies the criteria for evaluating the thermal endurance of either electrical insulating materials (EIM) and electrical insulation systems (EIS). It also specifies the procedure for assigning thermal classes.
This standard is applicable to the electrical insulating materials (EIM) and electrical insulation systems (EIS) where the thermal factor is the dominant ageing factor
Note: A thermal class is not assigned to an EIM as related to its use in an EIS.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60216-1 Electrical Insulating Materials — Properties of Thermal Endurance — Part 1: Ageing Procedures and Evaluation of Test Results
IEC 60216-5 Electrical Insulating Materials — Thermal Endurance Properties — Part 5: Determination of Relative Thermal Endurance Index (RTE) of an Insulating Material
IEC 60505 Evaluation and Qualification of Electrical Insulation Systems
IEC 61857 (all parts) Electrical Insulation Systems — Procedures for Thermal Evaluation
IEC 61858 Electrical Insulation Systems — Thermal Evaluation of Modifications to an Established Wire-wound EIS
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in IEC 60505, as well as the following, apply.
3.1
electrical insulating material (EIM)
solid or fluid with negligibly low electric conductivity, or a simple combination of such materials, used to separate conducting parts at different electrical potential in electrotechnical devices
