TC 55 - Winding wires

IEC TS 63263:2025 describes a test method for evaluating the lifetime of winding wires under electrical high frequency voltage impulses (with partial discharges) at elevated temperatures. This method is only applicable as a comparative examination under a given sample preparation and testing environment. The comparative nature of this document lies in the fact that the lifetime under partial discharges depends on a large number of influencing factors in the sample preparation and test conditions which could not all be thoroughly investigated so far.
This document applies to round and rectangular magnet wires.

IEC 60851-1: 2024 Amendment 1

IEC 60317-27-1:2024 Amendment 1

IEC 60317-0-3:2024 specifies the general requirements of enamelled round aluminium winding wires with or without a bonding layer. The range of nominal conductor diameters is given in the relevant specification sheet.
This edition includes the following significant technical changes with respect to the previous edition:
a) Revision to Clause 7, designating the test as inappropriate;
b) Revision to Clause 10, designating the test as inappropriate.

IEC 60851-3: 2023 specifies the following test methods for winding wires:
- Test 6: Elongation;
- Test 7: Springiness;
- Test 8: Flexibility and adherence;
- Test 11: Resistance to abrasion;
- Test 18: Heat bonding.
For definitions, general notes on test methods and the complete series of test methods for winding wires, IEC 60851-1 applies. This document also provides recommended friction test methods in Annex B. This fourth edition cancels and replaces the third edition published in 2009, Amendment 1:2013 and Amendment 2:2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Clarification of the distance measurement for determining loss of adhesion in 6.6.3, 6.6.4 for fibre-covered wires and 6.6.5 for tape-wrapped wires.

IEC 60317-93: 2023 specifies the requirements of enamelled rectangular copper winding wire of class 220 with a dual coating. The underlying coating is based on polyester or polyesterimide resin, which be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. The superimposed coating is based on polyamide-imide resin. NOTE A modified resin is a resin that has undergone a chemical change, or contains one or more additives to enhance certain performance or application characteristics. The range of nominal conductor dimensions covered by this standard is:
width: min. 2,0 mm max. 25,0 mm;
thickness: min. 0,80 mm max. 10,0 mm.
Wires of grade 1 and grade 2 are included in this specification and apply to the complete range of conductors. The specified combinations of width and thickness as well as the specified width/thickness ratio are given in IEC 60317-0-2. This International Standard is to be used in conjunction with IEC 60317-0-2:2020.

IEC 60317-89:2023 specifies the requirements of enamelled round aluminium winding wire of class 200 with a sole coating based on polyesterimide resin, which can be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. NOTE A modified resin is a resin that has undergone a chemical change, or contains one or more additives to enhance certain performance or application characteristics. The range of nominal conductor diameters covered by this standard is as follows:
grade 1: 0,250 mm up to and including 1,600 mm;
grade 2: 0,250 mm up to and including 5,000 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-3:2008 and IEC 60317-0-3:2008/AMD1:2013. This International Standard is to be used in conjunction with IEC 60317-0-3:2008, its Amendment 1 (2013) and its Amendment 2 (2019).

IEC 60317-3:2004+A1:2010 Specifies the requirements of enamelled round copper winding wire of class 155 with a sole coating based on polyester resin, which may be modified provided it retains the chemical identity of the original resin and meets all specified wire requirements. Class 155 is a thermal class that requires a minimum temperature index of 155 and a heat shock temperature of at least 175 °C. The temperature in degrees Celsius corresponding to the temperature index is not necessarily that at which it is recommended that the wire be operated and this will depend on many factors, including the type of equipment involved. The range of nominal conductor diameters covered by this standard is as follows:
- grade 1: 0,020 mm up to and including 3,150 mm;
- grade 2: 0,020 mm up to and including 5,000 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-1. The main changes with respect to the previous edition are listed below:
- new requirements for appearance, Subclause 3.2, added;
- the constant K, applied in calculating the number of revolutions for the peel test, Clause 8, increased from 130 mm to 150 mm;
- the test temperature for the cut-through test, Clause 10, increased from 240 °C to 270 °C;
- new pin hole test, Clause 23, added.
This publication is to be read in conjunction with  IEC 60317-0-1:2008.
This consolidated version consists of the third edition (2004) and its amendment 1 (2010). Therefore, no need to order amendment in addition to this publication.

IEC 60317-84:2021 specifies the requirements of enamelled round copper winding wires of class 200 with a sole coating based on polyesterimide resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements.
NOTE A modified resin is a resin that has undergone a chemical change or contains one or more additives to enhance certain performance or application characteristics.
The range of nominal conductor diameters covered by this document is as follows:
Grade 1: 0,018 mm up to and including 3,150 mm;
Grade 2: 0,020 mm up to and including 5,000 mm;
Grade 3: 0,0250 mm up to and including 1,600 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-1:2013.

IEC 60851-1:2021 specifies the general notes on methods of test for winding wires. It also gives the definitions for terms used in IEC 60851 (all parts). A survey of the contents of IEC 60851-2 to IEC 60851-6 is given in Annex A. This third edition cancels and replaces the second edition published in 1996, and its amendment 1:2003 and amendment 2:2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- revision to Clause 2 to update the list of normative references;
- revision to 3.2 atmospheric conditions for testing;
- addition to 3.2 with remarks concerning frequency and management of tests;
- revision to Annex A to update the contents list of IEC 60851 series of tests.

This consolidated version consists of the first edition (1997) and its amendment 1 (2010). Therefore, no need to order amendment in addition to this publication.

IEC 60172:2020 specifies, in accordance with the provisions of IEC 60216-1, a method for evaluating the temperature index of enamelled wire, varnished or unvarnished with an impregnating agent, and of tape wrapped round and rectangular wire, in air at atmospheric pressure by periodically monitoring changes in response to AC proof voltage tests. This procedure does not apply to fibre-insulated wire or wire covered with tapes containing inorganic fibres. NOTE The data obtained according to this test procedure provide the designer and development engineer with information for the selection of winding wire for further evaluation of insulation systems and equipment tests. This fifth edition cancels and replaces the fourth edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- revision of 3.1, definition of thermal index;
- revision of 3.3, time to failure;
- revisions to 5.1.1 for clarity and to reduce the range wire size range to which the test applies;
- revisions to 5.1.2 for tape wrapped round and enamelled or tape wrapped rectangular wire for clarity;
- revision to Clause 9 to add the correlation coefficient, r to the report.

IEC 60317-60-1: 2020 specifies the requirements of polyester glass-fibre wound fused, unvarnished, bare or grade 1 or grade 2 enamelled rectangular copper winding wires, temperature index 155.
NOTE For this type of wire, the heat shock test is inappropriate and therefore a heat shock temperature cannot be established. Consequently, a class based on the requirements for temperature index and heat shock temperature cannot be specified.
The range of nominal conductor dimensions covered by this document is:
width: min. 2,0 mm max. 16,0 mm;
thickness: min. 0,80 mm max. 5,60 mm.

IEC 60317-70-2:2020 specifies the requirements of polyester glass-fibre wound resin/varnish impregnated bare, grade 1 or grade 2 enamelled round copper winding wires, temperature index 155. The impregnating agent can be, for instance, epoxy, polyester, or polyesterimide resin based. The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-10:2017.
NOTE For this type of wire, the heat shock test is inappropriate and therefore a heat shock temperature cannot be established. Consequently, a class based on the requirements for temperature index and heat shock temperature cannot be specified.

IEC 60317-70-1:2020 specifies the requirements of polyester glass-fibre wound unvarnished and fused bare, grade 1 or grade 2 enamelled round copper winding wires, temperature index 155. The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-10:2017.
NOTE For this type of wire, the heat shock test is inappropriate and therefore a heat shock temperature cannot be established. Consequently, a class based on the requirements for temperature index and heat shock temperature cannot be specified.

IEC 60317-60-2:2020 specifies the requirements of polyester glass-fibre wound, resin or varnish impregnated, bare or grade 1 or grade 2 enamelled rectangular copper winding wires, temperature index 155. The impregnating agent can be, for instance, epoxy, polyester, or polyesterimide resin based. The range of nominal conductor dimensions covered by this document is:
– width: min. 2,0 mm max. 16,0 mm;
– thickness: min. 0,80 mm max. 5,60 mm.
NOTE For this type of wire, the heat shock test is inappropriate and therefore a heat shock temperature cannot be established. Consequently, a class based on the requirements for temperature index and heat shock temperature cannot be specified.

IEC 60317-0-2:2020 specifies the general requirements of enamelled rectangular copper winding wires. The range of nominal conductor dimensions is given in 4.1 and the relevant specification sheet. This fourth edition cancels and replaces the third edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- revision to Clause 2 to add new normative references for specifications for copper rods;
- revision to 3.1 to add a new definition for the term “bonding layer”;
- revision to 3.2.1 to the conditions specified for tests to be carried out;
- revision to 4.5 to add requirements for minimal, nomimal and maximal overall dimensions with a bonding layer;
- revision to Clause 5 to reference specifications for rectangular and square copper rod;
- revision to Clause 6 to take into account nominal proof strength;
- revision to 8.2 to the adherence test requirement;
- revision to Clause 18 to make reference to the relevant specification sheet.

IEC 60317-82: 2020 specifies the requirements of enamelled rectangular copper winding wires of class 200 with a sole coating based on polyesterimide resin, which can be modified provided it retains the chemical identity of the original resin and meets all specified wire requirements.
NOTE A modified resin is a resin that has undergone a chemical change or contains one or more additives to enhance certain performance or application characteristics.
The range of nominal conductor dimensions covered by this document is:
width: min. 2,0 mm max. 16,0 mm;
thickness: min. 0,80 mm max. 5,60 mm.  Wires of grade 1 and grade 2 are included in this specification and apply to the complete range of conductors. The specified combinations of width and thickness as well as the specified width/thickness ratio are given in IEC 60317-0-2.

IEC 60317-27-2:2020 specifies the requirements of paper tape covered round aluminium winding wires. This covering consists of two or more layers of paper tape and is primarily intended for winding coils for oil immersed transformers. The range of nominal conductor diameters covered by this document is:
- 0,500 mm up to and including 5,000 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-3:2008 and IEC 60317-0-3:2008/AMD1:2013. The paper tapes included in this document are restricted to those covered in IEC 60554-1 and IEC 60554-3-5.

IEC 60317-62:2020 specifies the requirements of polyester glass-fibre wound, silicone resin or varnish impregnated bare, grade 1 or grade 2 enamelled rectangular copper winding wires, temperature index 200. The impregnating agent is a silicone containing resin or varnish.The range of nominal conductor dimensions covered by this document is:
- width: min. 2,0 mm max. 16,0 mm;
- thickness: min. 0,80 mm max. 5,60 mm.
NOTE For this type of wire, the heat shock test is inappropriate and therefore a heat shock temperature cannot be established. Consequently, a class based on the requirements for temperature index and heat shock temperature cannot be specified.
This second edition cancels and replaces the first edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- revision to the title of the standard to more precisely describe the construction of the wire;
- revision to Clause 1, the scope of the standard, to provide more detail of the wire construction;
- revision to 3.2.2, general winding wire requirements of the glass fibre covering.

IEC 60317-0-6:2020 specifies the general requirements of glass-fibre wound resin or varnish impregnated, bare or enamelled, round copper winding wires. The range of nominal conductor diameters is given in the relevant specification sheet. This second edition cancels and replaces the first edition published in 2001 and Amendment 1:2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- revision to 3.3, Appearance;
- revision to Table 1, maximum overall diameter of grade 1 wire over single-glass fibre covering for nominal conductor diameters 1,600 mm - 5,000 mm;
- revision to Table 2, maximum overall diameter of grade 1 wire over double-glass fibre covering for nominal conductor diameters 1,600 mm - 5,000 mm;
clarification in Table 3 measurement of elongation as “minimum elongation %”.

IEC 60317-25:2020 specifies the requirements of enamelled round aluminium winding wires of class 200 with a dual coating. The underlying coating is based on polyester or polyesterimide resin, which can be modified provided it retains the chemical identity of the original resin and meets all specified wire requirements. The superimposed coating is based on polyamide-imide resin.
NOTE A modified resin is a resin that has undergone a chemical change, or contains one or more additives to enhance certain performance or application characteristics.
The range of nominal conductor diameters covered by this document is:
- Grade 1: 0,250 mm up to and including 3,150 mm;
- Grade 2: 0,250 mm up to and including 5,000 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-3:2008 and IEC 60317-0-3:2008/AMD1:2013. This fourth edition cancels and replaces the third edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- new 3.2.2 containing general notes on winding wire, formerly a part of the Scope;
- revision to Clause 11 to take into account intermediate nominal conductor diameters;
- revision to Clause 7 to indicate that the springiness test is inappropriate.
- revision to Clause 16 to specify only the percentage of extractable matter and the minimum retained dielectric breakdown voltage.

IEC 60317-12:2020 specifies the requirements of enamelled round copper winding wires of class 120 with a sole coating based on polyvinyl acetal or polyvinyl formal resin, which can be modified provided it retains the chemical identity of the original resin and meets all specified wire requirements.
NOTE 1 A modified resin is a resin that has undergone a chemical change, or contains one or more additives to enhance certain performance or application characteristics.
NOTE 2 Polyvinyl acetal is a general name for a family of thermoplastic vinyl resins produced by the condensation of polyvinyl alcohol with an aldehyde. Examples are polyvinyl acetal, polyvinyl formal and polyvinyl butyral. The range of nominal conductor diameters covered by this document is:
- Grade 1: 0,040 mm up to and including 2,500 mm;
- Grade 2: 0,040 mm up to and including 5,000 mm;
- Grade 3: 0,080 mm up to and including 5,000 mm.
The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-1:2013. This fourth edition of IEC 60317-12 cancels and replaces the third edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- modification of the Scope;
- addition of reference to transformer oil resistance test method in Clause 20.

IEC 60317-17:2020 specifies the requirements of enamelled rectangular copper winding wires of class 105 with a sole coating based on polyvinyl acetal resin, which can be modified provided it retains the chemical identity of the original resin and meets all specified wire requirements
NOTE 1 A modified resin is a resin that has undergone a chemical change, or contains one or more additives to enhance certain performance or application characteristics.
NOTE 2 Polyvinyl acetate is a general name for a family of thermoplastic vinyl resins produced by the condensation of polyvinyl alcohol with an aldehyde. Examples are polyvinyl acetal, polyvinyl formal and polyvinyl butyral. The range of nominal conductor dimensions covered by this document is:
- width: min. 2,0 mm max. 31,5 mm;
- thickness: min. 0,80 mm max. 10,00 mm.
Wires of grade 1 and grade 2 are included in this specification and apply to the complete range of conductors. The specified combinations of width and thickness as well as the specified ratio of width/thickness are given in IEC 60317-0-2. This fourth edition cancels and replaces the third edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- modification of the Scope (Clause 1);
- renaming of stretching test to adherence test and a modification of the requirement in 8.2.