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  • IEC 60216-3:2006

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Electrical insulating materials - Thermal endurance properties - Part 3: Instructions for calculating thermal endurance characteristics

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  31-12-2021

    Language(s): 

    Published date:  26-04-2006

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    1 Scope
    2 Normative references
    3 Terms, definitions, symbols and abbreviated terms
    4 Principles of calculations
      4.1 General principles
      4.2 Preliminary calculations
      4.3 Variance calculations
      4.4 Statistical tests
      4.5 Results
    5 Requirements and recommendations for valid calculations
      5.1 Requirements for experimental data
      5.2 Precision of calculations
    6 Calculation procedures
      6.1 Preliminary calculations
      6.2 Main calculations
      6.3 Statistical tests
      6.4 Thermal endurance graph
    7 Calculation and requirements for results
      7.1 Calculation of thermal endurance characteristics
      7.2 Summary of statistical tests and reporting
      7.3 Reporting of results
    8 Test report
    Annex A (normative) Decision flow chart
    Annex B (normative) Decision table
    Annex C (informative) Statistical tables
    Annex D (informative) Worked examples
    Annex E (informative) Computer program
    Bibliography
    Figures
    Tables

    Abstract - (Show below) - (Hide below)

    IEC 60216-3:2006 specifies the calculation procedures to be used for deriving thermal endurance characteristics from experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2, using fixed ageing temperatures and variable ageing times. The experimental data may be obtained using non-destructive, destructive or proof tests. Data obtained from non-destructive or proof tests may be incomplete, in that measurement of times taken to reach the endpoint may have been terminated at some point after the median time but before all specimens have reached end-point. The procedures are illustrated by worked examples, and suitable computer programs are recommended to facilitate the calculations. The major technical changes with regard to the first edition concern an updating of Table C.2. In addition, the scope has been extended to cover a greater range of data characteristics, particularly with regard to incomplete data, as often obtained from proof test criteria. The greater flexibility of use should lead to more efficient employment of the time available for ageing purposes. Finally, the procedures specified in this part of IEC 60216 have been extensively tested and have been used to calculate results from a large body of experimental data obtained in accordance with other parts of the standard. Annex E "Computer program" has been completely reworked.
    Please be aware that the computer program provided in this publication is not compatible with the 64-bit version of Windows 7.

    General Product Information - (Show below) - (Hide below)

    Committee TC 112
    Development Note Supersedes IEC 60216-3-1 and IEC 60216-3-2 (03/2002) Stability Date: 2018. (11/2012)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    02/209876 DC : DRAFT NOV 2002 IEC 62332 TS ED.1 - ELECTRICAL INSULATION SYSTEMS (EIS) - THERMAL EVALUATION OF COMBINED LIQUID AND SOLID COMPONENTS
    13/30284572 DC : 0 BS EN 60172 - TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE INDEX OF ENAMELLED WINDING WIRES
    CEI CLC/TS 60034-18-42 : 2012 ROTATING ELECTRICAL MACHINES - PART 18-42: QUALIFICATION AND ACCEPTANCE TESTS FOR PARTIAL DISCHARGE RESISTANT ELECTRICAL INSULATION SYSTEMS (TYPE 2) USED IN ROTATING ELECTRICAL MACHINES FED FROM VOLTAGE CONVERTERS
    02/204831 DC : DRAFT APR 2002 IEC 60505. ED. 3.0 - EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATION SYSTEMS
    04/30116245 DC : DRAFT JUL 2004 IEC 60216-4-1 ED.4 - GUIDE FOR THE DETERMINATION OF THERMAL ENDURANCE PROPERTIES OF ELECTRICAL INSULATING MATERIALS - PART 4: AGEING OVENS
    I.S. EN 60172:2015 TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE INDEX OF ENAMELLED AND TAPE WRAPPED WINDING WIRES
    BS EN 60216-1:2013 Electrical insulating materials. Thermal endurance properties Ageing procedures and evaluation of test results
    BS EN 60216-2:2005 Electrical insulating materials. Thermal endurance properties Determination of thermal endurance properties of electrical insulating materials. Choice of test criteria
    CSA C22.2 No. 62109-1 : 2016 SAFETY OF POWER CONVERTERS FOR USE IN PHOTOVOLTAIC POWER SYSTEMS - PART 1: GENERAL REQUIREMENTS
    CEI EN 60454-2 : 2008 PRESSURE-SENSITIVE ADHESIVE TAPES FOR ELECTRICAL PURPOSES - PART 2: METHODS OF TEST
    03/306455 DC : DRAFT APR 2003 IEC 61857-1 ED.2.0 - ELECTRICAL INSULATION SYSTEMS - PROCEDURES FOR THERMAL EVALUATION - PART 1: GENERAL REQUIREMENTS - LOW-VOLTAGE
    CEI EN 60172 : 2016 TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE INDEX OF ENAMELLED AND TAPE WRAPPED WINDING WIRES
    I.S. EN 62109-1:2010 SAFETY OF POWER CONVERTERS FOR USE IN PHOTOVOLTAIC POWER SYSTEMS - PART 1: GENERAL REQUIREMENTS
    NF EN 60216-2 : 2006 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 2: DETERMINATION OF THERMAL ENDURANCE PROPERTIES OF ELECTRICAL INSULATING MATERIALS - CHOICE OF TEST CRITERIA
    EN 60216-6:2006 Electrical insulating materials - Thermal endurance properties - Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method
    EN 60216-2:2005 Electrical insulating materials - Thermal endurance properties - Part 2: Determination of thermal endurance properties of electrical insulating materials - Choice of test criteria
    EN 60505:2011/AC:2017-03 EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATION SYSTEMS (IEC 60505:2011/COR1:2017)
    EN 60454-2:2007 PRESSURE-SENSITIVE ADHESIVE TAPES FOR ELECTRICAL PURPOSES - PART 2: METHODS OF TEST
    EN 60216-1:2013 Electrical insulating materials - Thermal endurance properties - Part 1: Ageing procedures and evaluation of test results
    BS EN 60454-2:2007 PRESSURE-SENSITIVE ADHESIVE TAPES FOR ELECTRICAL PURPOSES - PART 2: METHODS OF TEST
    BIS IS 8504-2 : 2013 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 2: DETERMINATION OF THERMAL ENDURANCE PROPERTIES OF ELECTRICAL INSULATING MATERIALS - CHOICE OF TEST CRITERIA
    PD IEC/TR 60493-2:2010 Guide for the statistical analysis of ageing test data Validation of procedures for statistical analysis of censored normally distributed data
    PD IEC/TS 62332-3:2016 ELECTRICAL INSULATION SYSTEMS (EIS) - THERMAL EVALUATION OF COMBINED LIQUID AND SOLID COMPONENTS - PART 3: HERMETIC MOTOR-COMPRESSORS
    BS EN 60216-8:2013 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 8: INSTRUCTIONS FOR CALCULATING THERMAL ENDURANCE CHARACTERISTICS USING SIMPLIFIED PROCEDURES
    S.R. CLC/TS 60034-18-42:2011 ACCEPTANCE TESTS FOR PARTIAL DISCHARGE RESISTANT ELECTRICAL INSULATION SYSTEMS (TYPE 2) USED IN ROTATING ELECTRICAL MACHINES FED FROM VOLTAGE CONVERTERS
    DIN IEC 60085 : 1993 THERMAL EVALUATION AND CLASSIFICATION OF ELECTRICAL INSULATION
    PD IEC/TS 60216-7-1:2015 ELECTRICAL INSULATION MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 7-1: ACCELERATED DETERMINATION OF RELATIVE THERMAL ENDURANCE USING ANALYTICAL TEST METHODS RTE[A] - INSTRUCTIONS FOR CALCULATIONS BASED ON ACTIVATION ENERGY
    BS EN 60216-6:2006 Electrical insulating materials. Thermal endurance properties Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method
    I.S. EN 60505:2011 EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATION SYSTEMS
    I.S. EN 60454-2:2007 PRESSURE-SENSITIVE ADHESIVE TAPES FOR ELECTRICAL PURPOSES - PART 2: METHODS OF TEST
    CLC/TS 60034-18-42:2011 Rotating electrical machines - Part 18-42: Qualification and acceptance tests for partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters
    BIS IS 8504-6 : 2012 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 6: DETERMINATION OF RELATIVE THERMAL ENDURANCE INDEX (RTE) OF AN INSULATING MATERIAL
    NF EN 60216-1 : 2013 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 1: AGEING PROCEDURES AND EVALUATION OF TEST RESULTS
    IEEE DRAFT 434 : D10 2006 FUNCTIONAL EVALUATION OF INSULATION SYSTEMS FOR AC ELECTRIC MACHINES RATED 2300 V AND ABOVE
    NF EN 60216-5 : 2008 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 5: DETERMINATION OF RELATIVE THERMAL ENDURANCE INDEX (RTE) OF AN INSULATING MATERIAL
    IEC TS 60034-18-42:2008 Rotating electrical machines - Part 18-42: Qualification and acceptance tests for partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters
    IEC TS 62332-3:2016 Electrical insulation systems (EIS) - Thermal evaluation of combined liquid and solid components - Part 3: Hermetic motor-compressors
    IEC 62899-201:2016 Printed electronics - Part 201: Materials - Substrates
    EN 60172:2015 Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires
    11/30244661 DC : 0 BS EN 60493-1 - GUIDE FOR THE STATISTICAL ANALYSIS OF AGEING TEST DATA - PART 1: METHODS BASED ON MEAN VALUES OF NORMALLY DISTRIBUTED TEST RESULTS
    09/30198417 DC : DRAFT JAN 2009 BS EN 60505 - EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATION SYSTEMS
    BS EN 60216-5:2008 Electrical insulating materials. Thermal endurance properties Determination of relative thermal endurance index (RTE) of an insulating material
    14/30304003 DC : 0 BS EN 62899-1 ED.1 - PRINTED ELECTRONICS - MATERIALS - PART 1: SUBSTRATES
    DD CLC/TS 60034-18-42:2011 ROTATING ELECTRICAL MACHINES - PART 18-42: QUALIFICATION AND ACCEPTANCE TESTS FOR PARTIAL DISCHARGE RESISTANT ELECTRICAL INSULATION SYSTEMS (TYPE 2) USED IN ROTATING ELECTRICAL MACHINES FED FROM VOLTAGE CONVERTERS
    08/30184920 DC : DRAFT JULY 2008 BS EN 60034-18-31 - ROTATING ELECTRICAL MACHINES - 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
    BS 6921:1988 METHOD FOR EVALUATION OF THE THERMAL ENDURANCE OF FLEXIBLE SHEET ELECTRICAL INSULATING MATERIALS USING THE WRAPPED TUBE METHOD
    02/207211 DC : DRAFT JULY 2002 IEC 60085 ED.3.0 - THERMAL EVALUATION AND CLASSIFICATION OF ELECTRICAL INSULATION
    15/30330425 DC : 0 BS EN 60370 ED 2.0 - TEST PROCEDURE FOR THERMAL ENDURANCE OF INSULATING RESINS AND VARNISHES FOR IMPREGNATION PURPOSES - ELECTRIC BREAKDOWN METHODS
    IEC 60493-1:2011 Guide for the statistical analysis of ageing test data - Part 1: Methods based on mean values of normally distributed test results
    IEC TR 60493-2:2010 Guide for the statistical analysis of ageing test data - Part 2: Validation of procedures for statistical analysis of censored normally distributed data
    NF EN 60216-6 : 2006 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 6: DETERMINATION OF THERMAL ENDURANCE INDICES (TI AND RTE) OF AN INSULATING MATERIAL USING THE FIXED TIME FRAME METHOD
    I.S. EN 60216-1:2013 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 1: AGEING PROCEDURES AND EVALUATION OF TEST RESULTS (IEC 60216-1:2013 (EQV))
    IEC 60076-12:2008 Power transformers - Part 12: Loading guide for dry-type power transformers
    IEC 60216-8:2013 Electrical insulating materials - Thermal endurance properties - Part 8: Instructions for calculating thermal endurance characteristics using simplified procedures
    IEC TS 60216-7-1:2015 Electrical insulation materials - Thermal endurance properties - Part 7-1: Accelerated determination of relative thermal endurance using analytical test methods (RTEA) - Instructions for calculations based on activation energy
    UNE-EN 62109-1:2011 Safety of power converters for use in photovoltaic power systems -- Part 1: General requirements
    IEC 60216-2:2005 Electrical insulating materials - Thermal endurance properties - Part 2: Determination of thermal endurance properties of electrical insulating materials - Choice of test criteria
    06/30159335 DC : 0 BS EN 60216-5 - ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 5: DETERMINATION OF RELATIVE THERMAL ENDURANCE INDEX (RTE) OF AN INSULATING MATERIAL
    05/30128627 DC : DRAFT FEB 2005 IEC 60216-6 ED.2 - ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 6: DETERMINATION OF THERMAL ENDURANCE INDICES (TI AND RTE) OF AN INSULATING MATERIAL USING THE FIXED TIME FRAME METHOD
    11/30246689 DC : 0 BS EN 60216-8 - ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 8: INSTRUCTIONS FOR CALCULATING THERMAL ENDURANCE CHARACTERISTICS USING SIMPLIFIED PROCEDURES
    BS EN 60216-4-1:2006 Electrical insulating materials. Thermal endurance properties Ageing ovens - Single-chamber ovens
    IEEE 434-2006 FUNCTIONAL EVALUATION OF INSULATION SYSTEMS FOR AC ELECTRIC MACHINES RATED 2300 V AND ABOVE
    12/30263544 DC : 0 BS EN 60216-1 - ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 1: AGEING PROCEDURES AND EVALUATION OF TEST RESULTS
    BS EN 60505:2011 Evaluation and qualification of electrical insulation systems
    CEI EN 60216-6 : 2007 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 6: DETERMINATION OF THERMAL ENDURANCE INDICES (TI AND RTE) OF AN INSULATING MATERIAL USING THE FIXED TIME FRAME METHOD
    PD IEC/TS 62332-2:2014 Electrical insulation systems (EIS). Thermal evaluation of combined liquid and solid components Simplified test
    NF EN 60454-2 : 2013 PRESSURE-SENSITIVE ADHESIVE TAPES FOR ELECTRICAL PURPOSES - PART 2: METHODS OF TEST
    CSA E61347.1 : 2003 : R2013 LAMP CONTROLGEAR - PART 1: GENERAL AND SAFETY REQUIREMENTS
    I.S. EN 60216-8:2013 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 8: INSTRUCTIONS FOR CALCULATING THERMAL ENDURANCE CHARACTERISTICS USING SIMPLIFIED PROCEDURES (IEC 60216-8:2013 (EQV))
    IEC TR 62392:2006 Suitability of typical electrical insulating material (EIM) for polymer recycling
    BIS IS 8504-1 : 2012 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 1: AGEING PROCEDURES AND EVALUATION OF TEST RESULTS
    BS IEC 62899-201 : 2016 PRINTED ELECTRONICS - PART 201: MATERIALS - SUBSTRATES
    I.S. EN 60216-5:2008 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 5: DETERMINATION OF RELATIVE THERMAL ENDURANCE INDEX (RTE) OF AN INSULATING MATERIAL
    I.S. EN 60216-6:2004 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 6: DETERMINATION OF THERMAL ENDURANCE INDICES (TI AND RTE) OF AN INSULATING MATERIAL USING THE FIXED TIME FRAME METHOD
    CEI EN 60505 : 2012 EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATION SYSTEMS
    CEI EN 60216-2 : 2006 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 2: DETERMINATION OF THERMAL ENDURANCE PROPERTIES OF ELECTRICAL INSULATING MATERIALS - CHOICE OF TEST CRITERIA
    CEI EN 60216-1 : 2014 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 1: AGEING PROCEDURES AND EVALUATION OF TEST RESULTS
    IEC 60172:2015 Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires
    IEC 60505:2011 Evaluation and qualification of electrical insulation systems
    BS EN 62109-1:2010 Safety of power converters for use in photovoltaic power systems General requirements
    UNE-EN 60172:2015 Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires
    IEC 60454-2:2007 Pressure-sensitive adhesive tapes for electrical purposes - Part 2: Methods of test
    IEC 60216-6:2006 Electrical insulating materials - Thermal endurance properties - Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method
    IEC 60216-1:2013 Electrical insulating materials - Thermal endurance properties - Part 1: Ageing procedures and evaluation of test results
    IEC 60216-5:2008 Electrical insulating materials - Thermal endurance properties - Part 5: Determination of relative thermal endurance index (RTE) of an insulating material
    BS EN 60172:2015 Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires
    EN 62109-1 : 2010 SAFETY OF POWER CONVERTERS FOR USE IN PHOTOVOLTAIC POWER SYSTEMS - PART 1: GENERAL REQUIREMENTS
    13/30277896 DC : 0 BS EN 60034-18-42 ED 1.0 - ROTATING ELECTRICAL MACHINES - PART 18-42: QUALIFICATION AND ACCEPTANCE TESTS FOR PARTIAL DISCHARGE RESISTANT ELECTRICAL INSULATION SYSTEMS (TYPE 2) USED IN ROTATING ELECTRICAL MACHINES FED FROM VOLTAGE CONVERTERS
    CEI EN 60216-5 : 2012 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 5: DETERMINATION OF RELATIVE THERMAL ENDURANCE INDEX (RTE) OF AN INSULATING MATERIAL
    NF EN 60505 : 2011 EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATION SYSTEMS
    BS IEC 60493-1:2011 GUIDE FOR THE STATISTICAL ANALYSIS OF AGEING TEST DATA - PART 1: METHODS BASED ON MEAN VALUES OF NORMALLY DISTRIBUTED TEST RESULTS
    CSA E61347.1 :2003 LAMP CONTROLGEAR - PART 1: GENERAL AND SAFETY REQUIREMENTS
    CEI EN 60216-8 : 2014 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 8: INSTRUCTIONS FOR CALCULATING THERMAL ENDURANCE CHARACTERISTICS USING SIMPLIFIED PROCEDURES
    BIS IS 8504-7 : 2012 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 7: DETERMINATION OF THERMAL ENDURANCE INDICES (TI AND RTE) OF AN INSULATING MATERIAL USING THE FIXED TIME FRAME METHOD
    CEI EN 60216-4-1 : 2006 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 4-1: AGEING OVENS - SINGLE-CHAMBER OVENS
    IEC TS 62332-2:2014 Electrical insulation systems (EIS) - Thermal evaluation of combined liquid and solid components - Part 2: Simplified test
    I.S. EN 60216-2:2005 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 2: DETERMINATION OF THERMAL ENDURANCE PROPERTIES OF ELECTRICAL INSULATING MATERIALS - CHOICE OF TEST CRITERIA
    I.S. EN 60216-4-1:2006 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - PART 4-1: AGEING OVENS - SINGLE-CHAMBER OVENS
    IEC 62109-1:2010 Safety of power converters for use in photovoltaic power systems - Part 1: General requirements
    03/314451 DC : DRAFT SEP 2003 IEC 62392 TR ED.1 - SUITABILITY OF TYPICAL ELECTRICAL INSULATING MATERIAL FOR POLYMER RECYCLING
    IEC 60216-4-1:2006 Electrical insulating materials - Thermal endurance properties - Part 4-1: Ageing ovens - Single-chamber ovens
    EN 60216-4-1:2006 Electrical insulating materials - Thermal endurance properties - Part 4-1: Ageing ovens - Single-chamber ovens
    EN 60216-8:2013 Electrical insulating materials - Thermal endurance properties - Part 8: Instructions for calculating thermal endurance characteristics using simplified procedures
    EN 60216-5:2008 Electrical insulating materials - Thermal endurance properties - Part 5: Determination of relative thermal endurance index (RTE) of an insulating material

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 60493-1:2011 Guide for the statistical analysis of ageing test data - Part 1: Methods based on mean values of normally distributed test results
    IEC 60216-2:2005 Electrical insulating materials - Thermal endurance properties - Part 2: Determination of thermal endurance properties of electrical insulating materials - Choice of test criteria
    IEC 60216-5:2008 Electrical insulating materials - Thermal endurance properties - Part 5: Determination of relative thermal endurance index (RTE) of an insulating material
    IEC 60216-1:2013 Electrical insulating materials - Thermal endurance properties - Part 1: Ageing procedures and evaluation of test results
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