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NEK IEC TS 61857-42:2025

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Abstract

This document provides a procedure to evaluate the lifetime of an electrical insulation system (EIS) in a drivetrain unit within road transportation (automotive) applications. Typical applications include motors and generators in hybrid and full electric passenger vehicles, light-duty and heavy-duty commercial vehicles, as well as buses.In general, the IEC 61857 series is applicable to EIS used in electrotechnical products with an input voltage of up to 1 000 V where the predominant ageing factor is thermal. In the context of this document the limit of 1 000 V is understood to be the application-specific battery DC voltage.The EIS evaluated by this procedure will operate free from partial discharges over its whole lifetime.Evaluation of EIS in the following applications is outside the scope:motors and generators within the scope of IEC TC 2, Rotating machinery;rail traction machines in the scope of IEC TC 9, Electrical equipment and systems for railways;motors and generators for road vehicles that are not intended for the traction of them.

Document information

  • Standard from NEK
  • Published:
  • Edition: 1.0
  • Version: 1
  • Document type: TS
  • ICS 29.080.30

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  • Adopted from: IEC TS 61857-42:2025