WG 7 - TC 15/WG 7

IEC 60455-2:2023 is available as IEC 60455-2:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60455-2:2023 specifies methods of test to be used for testing resin based reactive compounds, their components and cured compounds used for electrical insulation. This fourth edition cancels and replaces the third edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Introduction of test methods related to IEC 60455-3-8;
b) Additional and updated test methods for resins.

IEC 60455-3-8:2021 is available as IEC 60455-3-8:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60455-3-8:2021 gives the requirements for resins for power cable accessories that conform to this specification and meet established levels of performance. However, the selection of a material by a user for a specific application will be based on the actual requirements necessary for adequate performance in that application and not on this specification alone. These materials are designed to be used in low and medium voltage cable accessories and as such, electrical performance is proven as part of the assembly. Examples of this are described in EN 50393 and IEC 60502-4. This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Clause 1: a link to assemblies according to IEC 60502-4 and EN 50393 was introduced;
- designation: the categories, especially the mechanical ones, were redefined;
- type tests: the testing was updated based on the chemical basis of the material;
- type tests: additional materials were introduced;
- Annex A: an examination grid was established.

IEC 60370:2017 covers methods of test for the determination of thermal endurance (temperature index) of electrical insulating resins and varnishes for impregnation purposes. It is done by means of impregnating glass cloth and measuring electric strength or breakdown voltage before and after heat ageing. It covers the materials described in IEC 60455-3-5 and IEC 60464-3-2 and similar materials. This second edition cancels and replaces the first edition published in 1971. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- this document is now describing two methods, the existing one, following ASTM D1932 and new a method following the requirements of IEC 60455-2 and IEC 60464-2;
- the theoretical background and way of calculation were removed, and replaced by reference to IEC 60216;
- the layout and numbering system was updated;
- for better understanding and illustration purposes examples were added.
Keywords: thermal endurance testing

IEC 60455-2:2015 specifies methods of test to be used for testing resin based reactive compounds, their components and cured compounds used for electrical insulation. This third edition cancels and replaces the second edition published in 1998. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Introduction of test methods related to IEC 60455-3-8;
- Additional and updated test methods for resins. Keywords: resin based reactive compounds used for electrical insulation

Gives the requirements for ambient curing finishing varnishes.

This sheet specifies requirements for hot curing impregnating varnishes and includes requirements for certain properties at elevated temperatures.

Relates to varnishes used for electrical insulation. All varnishes contain solvent. The varnishes may be used for finishing or impregnating applications, and may be dried or dried and cured at ambient temperatures.

IEC 60455-3-8:2013 gives the requirements for resins for power cable accessories which conform to this specification and meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not on this specification alone. Key words: requirements for resins for power cable accessories

This sheet 5 of IEC 60455-3 gives the requirements for unsaturated polyester based impregnating resins, and includes requirements for certain properties at elevated temperature.

Gives the methods of test for electrical insulating materials suitable for application as coatings for loaded printed wire boards (conformal coatings), both as uncured and after application to specific boards. The major changes concern the addition of a new specimen A, new cleaning and test procedures and a new layout. The contents of the corrigendum of January 2005 have been included in this copy.

Gives the property requirements for electrical insulating materials suitable for application as coatings for loaded printed wire boards (conformal coatings). Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone. This edition includes the following significant technical changes from the previous edition: a) requirements for cleaning have been added; b) new properties based on modifications to IEC 61086-2 have been added; c) a Class 3 material for aerospace applications has been included.

Gives the definitions, classification and general requirements for electrical insulating materials suitable for application as coatings for loaded printed wire boards (conformal coatings). This standard excludes requirements for compatibility between such coatings and printed wire boards, this characteristic being evaluated in individual applications. Surface modifiers are not classified as conformal coatings. They only provide a thin film that does not cure and has low mar resistance. They are excluded from this standard. Materials which conform to this standard meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this standard alone. This edition includes the following significant technical changes from the previous edition: a) a Class 3 material for aerospace applications has been included; b) a new resin type (oligomeric blend material) has been added.

Gives the requirements for filled polyurethane resinous compounds in the cured form for classes PUR-F-4 to PUR-F-8.

Gives the requirements for unfilled polyurethane resinous compounds in the cured form for classes PUR-U-4 to PUR-U-8 with an ash content of not more than 6 %.

Gives the requirements for unfilled epoxy resinous compounds in the cured form for classes EP-U-1 to EP-U-7.

Gives the requirements for quartz filled epoxy resinous compounds in the cured form for types EP-F-1 to EP-F-7. Other materials than quartz may be introduced later.

Specifies methods of test to be used for testing varnishes used for electrical insulation. This includes methods of test to be applied before and others to be applied after drying and/or curing of the varnish.

Gives designation, general requirements and classification of cured compounds, based on the glass transition temperature. Does not relate to reactive compounds used as coating powders. All reactive compounds are solvent-free and may contain reactive diluents and fillers. Does not relate to reactive compounds used as coating powders.