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BRITISH STANDARD BS EN 60085:2004
Electrical insulation — Thermal classification
The European Standard EN 60085:2004 has the status of a British Standard
ICS 17.220.99; 29.035.01
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BS EN 60085:2004
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 November 2004
© BSI 12 November 2004
ISBN 0 580 44752 9
National forewordThis British Standard is the official English language version of EN 60085:2004. It is identical with IEC 60085:2004. It supersedes BS 2757:1986 which is withdrawn.
The UK participation in its preparation was entrusted by Technical Committee GEL/15, Insulating materials, to Subcommittee GEL/15/5, Methods of test, which has the responsibility to:
A list of organizations represented on this subcommittee can be obtained on request to its secretary.
Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity from legal obligations.
— aid enquirers to understand the text;
— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
— monitor related international and European developments and promulgate them in the UK.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover.
The BSI copyright notice displayed in this document indicates when the document was last issued.
Amendments issued since publication
Amd. No. Date Comments
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EUROPEAN STANDARD EN 60085
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2004
CENELEC European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60085:2004 E
ICS 17.220.99; 29.035.01 Supersedes HD 566 S1:1990
English version
Electrical insulation - Thermal classification
(IEC 60085:2004) Isolation électrique - Classification thermique (CEI 60085:2004)
Elektrische Isolierung - Thermische Klassifizierung (IEC 60085:2004)
This European Standard was approved by CENELEC on 2004-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Foreword
The text of document 15E/232/FDIS, future edition 3 of IEC 60085, prepared by SC 15E, Methods of test, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60085 on 2004-09-01.
This European Standard supersedes HD 566 S1:1990. It constitutes a technical revision and distinguishes between thermal classes for electrical insulation systems and electrical insulating materials.
The following dates were fixed:
– latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
(dop)
2005-06-01
– latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2007-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60085:2004 was approved by CENELEC as a European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60093 NOTE Harmonized as HD 429 S1:1983 (not modified).
IEC 60216-3 NOTE Harmonized as EN 60216-3:2002 (not modified).
IEC 60243-1 NOTE Harmonized as EN 60243-1:1998 (not modified).
IEC 60243-2 NOTE Harmonized as EN 60243-2:2001 (not modified).
IEC 60243-3 NOTE Harmonized as EN 60243-3:2001 (not modified).
IEC 60345 NOTE Harmonized as HD 438 S1:1984 (not modified).
IEC 60626-1 NOTE Harmonized as EN 60626-1:1995 (not modified).
IEC 60626-2 NOTE Harmonized as EN 60626-2:1995 (not modified).
IEC 60626-3 NOTE Harmonized as EN 60626-3:1996 (not modified).
IEC 61006 NOTE Harmonized as EN 61006:2004 (not modified).
IEC 61074 NOTE Harmonized as EN 61074:1993 (not modified).
ISO 75 NOTE Harmonized in EN ISO 75 series (not modified)
Page 2EN 60085:2004
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ISO 178 NOTE Harmonized as EN ISO 178:2003 (not modified)
ISO 306 NOTE Harmonized as EN ISO 306:2004 (not modified)
ISO 527 NOTE Harmonized in EN ISO 527 series (not modified)
ISO 899 NOTE Harmonized in EN ISO 899 series (not modified)
ISO 3146 NOTE Harmonized as EN ISO 3146:2000 (not modified)
ISO 6721 NOTE Harmonized in EN ISO 6721 series (not modified)
ISO 11248 NOTE Harmonized as EN ISO 11248:1999 (not modified)
ISO 11358 NOTE Harmonized as EN ISO 11358:1997 (not modified)
__________
Page 3EN 60085:2004
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ELECTRICAL INSULATION – THERMAL CLASSIFICATION
1 Scope
This standard gives guidance on the application of international standards in assigning a thermal class to electrical insulating materials (EIM) or simple combinations of such materials (IEC 60216-1), to electrical insulation systems (IEC 62114) and to insulation for electrical devices.
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 60216-6, 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 61857-1, Electrical insulation systems – Procedures for thermal evaluation – Part 1: General requirements – Low-voltage
IEC 62114, Electrical insulation systems – Thermal classification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1 electrical insulating material EIM solid with negligibly low electric conductivity, or a simple combination of such materials, used to separate conducting parts at different electrical potential in electrical devices
NOTE 1 In English, the term “insulating material” is sometimes used in a broader sense to designate also insulating liquids and gases.
NOTE 2 For testing purposes, electrodes may be applied on material specimens without this combination formally constituting an EIS to be tested as such.
Page 4EN 60085:2004
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3.2 simple combination of electrical insulating materials combination of EIM delivered in joint state for production of devices
NOTE For example a flexible material consisting of paper laminated on polyethylene terephthalate film (IEC 60626) constitutes a “simple combination” in this sense. EIMs combined during the manufacturing process of a device do not constitute “simple combinations” in this sense.
3.3 electrical insulation system EIS insulating structure containing one or more electrical insulating materials (EIMs) together with associated conducting parts employed in an electrotechnical device
3.4 thermal class designation of an EIM/EIS equal to the numerical value of the maximum used temperature in degrees Celsius for which the EIM/EIS is appropriate
NOTE It may be necessary to assign different thermal classes to the same EIM/EIS for different service conditions. The description of an electrotechnical product as being of a particular thermal class does not mean, and must not be taken to imply that each insulating material used in its construction is of the same thermal capability.
3.5 relative thermal endurance index RTE numerical value of the temperature in degrees Celsius at which the estimated time to endpoint of the candidate material is the same as the estimated time to endpoint of the control material at a temperature equal to its assessed thermal endurance (ATE)
3.6 assessed thermal endurance index ATE numerical value of the temperature in degrees Celsius, up to which the control material possesses known, satisfactory service performance in the specified application
NOTE 1 The value of the ATE may vary between applications for the same material.
NOTE 2 Sometimes referred to as “absolute” thermal endurance index.
3.7 candidate material material for which an estimate of the thermal endurance is required to be determined
NOTE The determination is made by simultaneous thermal ageing of the material and a control material.
3.8 control material material with known thermal endurance, preferably derived from service experience, used for comparative tests with the candidate material
4 Thermal endurance evaluation and classification
The thermal classification for insulation materials cannot be applied to an insulation system of which they are components, unless the validity thereof is proved. Vice versa, the thermal classification of a material cannot be deduced from the thermal class of an insulating system of which it is a component.
Page 5EN 60085:2004
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4.1 Electrical insulating materials (EIM)
Electrical insulating materials and simple combinations of insulating materials shall be evaluated in accordance with IEC 60216-5 or IEC 60216-6 and refer to expected service conditions.
4.2 Electrical insulation systems (EIS)
Electrical insulation systems shall be evaluated in accordance with IEC 61857-1 and classified in accordance with IEC 62114.
5 Thermal class
Since the temperature in electrotechnical devices is very often the dominant ageing factor affecting electrical insulating materials, certain basic thermal classes are useful and are recognized as such internationally. Where a thermal class is specified for an electrical insulating material, this means the maximum used temperature in degrees Celsius for which the EIM is appropriate.
Table 1 – Thermal classification of electrical insulating materials
RTE Thermal class Previous designation
< 90 70
>90-105 90 Y
>105-120 105 A
>120-130 120 E
>130-155 130 B
>155-180 155 F
>180-200 180 H
>200-220 200
>220-250 220
>250 250
NOTE This table gives the thermal class designations corresponding to different temperature intervals of the RTE for an EIM . The capital letters in the 3rd row refer to the class designations in the earlier edition of IEC 60085 (1984). The designation “Y” applies also to RTE values below 90.
The thermal class attributed to a material used in an insulation system does not automatically imply that the thermal class of the system is the same as for that material, or for the material with the lowest class designation in case more than one material with different class designations are used in the system.
Page 6EN 60085:2004
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Annex ZA (normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60216-1 - 1) Electrical insulating materials - Properties of thermal endurance Part 1: Ageing procedures and evaluation of test results
EN 60216-1 2001 2)
IEC 60216-5 - 1) Part 5: Determination of relative thermal endurance index (RTE) of an insulating material
EN 60216-5 2003 2)
IEC 60216-6 - 1) Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method
EN 60216-6 2004 2)
IEC 61857-1 - 1) Electrical insulation systems - Procedures for thermal evaluation Part 1: General requirements - Low-voltage
EN 61857-1 1999 2)
IEC 62114 - 1) Electrical insulation systems (EIS) - Thermal classification
EN 62114 2001 2)
1) Undated reference. 2) Valid edition at date of issue.
Page 7EN 60085:2004
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Bibliography
IEC 60093, Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
IEC 60216-2, Electrical insulating materials – Thermal endurance properties – Part 2: Guide for the determination of thermal endurance properties of electrical insulating materials – Choice of test criteria 1
IEC 60216-3, Electrical insulating materials – Thermal endurance properties – Part 3: Instructions for calculating thermal endurance characteristics
IEC 60243-1, Electrical strength of insulating materials – Test methods – Part 1: Tests at power frequencies
IEC 60243-2, Electrical strength of insulating materials – Test methods – Part 2: Additional requirements for tests using direct voltage
IEC 60243-3, Electrical strength of insulating materials – Test methods – Part 3: Additional requirements for 1,2/50 µs impulse tests
IEC 60250, Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio and radio frequencies including metre wavelengths
IEC 60345, Method of test for electrical resistance and resistivity of insulating materials at elevated temperatures
IEC 60377-1, Methods for the determination of the dielectric properties of insulating materials at frequencies above 300 MHz – Part 1: General
IEC 60377-2, Methods for the determination of the dielectric properties of insulating materials at frequencies above 300 MHz – Part 2: Resonance methods
IEC 60626-1, Combined flexible materials for electrical insulation – Part 1: Definitions and general requirements
IEC 60626-2, Combined flexible materials for electrical insulation – Part 2: Methods of test
IEC 60626-3, Combined flexible materials for electrical insulation – Part 3: Specifications for individual materials
IEC 61006, Electrical insulating materials – Methods of test for the determination of the glass transition temperature
IEC 61074, Determination of heats and temperatures of melting and crystallization of electrically insulating materials by differential scanning calorimetry
ISO 75 (all parts), Plastics – Determination of temperature of deflection under load
ISO 178, Plastics – Determination of flexural properties
——————— 1 Under consideration.
Page 8EN 60085:2004
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ISO 306, Plastics – Thermoplastic materials – Determination of Vicat softening temperature (VST)
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 899 (all parts), Plastics – Determination of creep behaviour
ISO 3146, Plastics – Determination of melting behaviour (melting temperature or melting range) of semi-crystalline polymers by capillary tube and polarizing–microscope methods
ISO 6721 (all parts), Plastics – Determination of dynamic mechanical properties
ISO 11248, Plastics – Thermosetting moulding materials – Evaluation of short-term perform-ance at elevated temperatures
ISO 11357 (all parts), Plastics – Differential scanning calorimetry (DSC)
ISO 11358, Plastics – Thermogravimetry (TG) of polymers – General principles
ISO 11359 (all parts), Plastics – Thermomechanical analysis (TMA)
ISO 14679, Adhesives – Measurement of adhesion characteristics by a three-point bending method
___________
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BS EN 60085:2004
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