Classification of insulating liquids (IEC 61039:2008)

This International Standard establishes the detailed classification of the N family (insulating liquids) that belongs to class L (lubricants, industrial oils and related products) in accordance with ISO 8681 and ISO 6743-99, affecting product categories that include products derived from petroleum processing, synthetic chemical products and synthetic and natural esters.

Allgemeine Klassifikation der Isolierflüssigkeiten (IEC 61039:2008)

Classification des liquides isolants (CEI 61039:2008)

La CEI 61039:2008 établit la classification détaillée de la famille N (isolants liquides) qui appartient à la classe L (lubrifiants, huiles industrielles et produits connexes) conformément aux normes ISO 8681 et ISO 6743-99, affectant les catégories de produit qui incluent les produits dérivés du traitement du pétrole, les produits chimiques synthétiques et les esters naturels et synthétiques. La modification majeure par rapport à l'édition précédente concerne la mise à jour de la classification des liquides isolants, en tenant compte d'un nombre maximal de substances qui ont, ou peuvent avoir, des applications possibles dans les composants électriques.

Splošna klasifikacija izolacijskih tekočin (IEC 61039:2008)

General Information

Publication Date
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
Due Date
Completion Date


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Standards Content (Sample)

SIST EN 61039:2008
SIST HD 618 S1:1997
Classification of insulating liquids (IEC 61039:2008)
Allgemeine Klassifikation der Isolierflüssigkeiten (IEC 61039:2008)
Classification des liquides isolants (CEI 61039:2008)
Ta slovenski standard je istoveten z: EN 61039:2008
29.040.10 Izolacijska olja Insulating oils
SIST EN 61039:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61039:2008

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SIST EN 61039:2008

EN 61039

October 2008

ICS 29.040.10 Supersedes HD 618 S1:1992

English version

Classification of insulating liquids
(IEC 61039:2008)

Classification des liquides isolants Klassifizierung der Isolierflüssigkeiten
(CEI 61039:2008) (IEC 61039:2008)

This European Standard was approved by CENELEC on 2008-10-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61039:2008 E

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SIST EN 61039:2008
EN 61039:2008 - 2 -
The text of document 10/741/FDIS, future edition 2 of IEC 61039, prepared by IEC TC 10, Fluids for
electrotechnical applications, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61039 on 2008-10-01.
This European Standard supersedes HD 618 S1:1992.
The main change with regard to HD 618 S1:1992 concerns the updating of the classification of insulating
liquids, taking into account the largest number possible of substances that have, or may have, possible
application in electrical components.
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) 2009-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-10-01
Annex ZA has been added by CENELEC.
Endorsement notice
The text of the International Standard IEC 61039:2008 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 61100 NOTE  Harmonized as EN 61100:1992 (not modified).
ISO 2719 NOTE  Harmonized as EN ISO 2719:2002 (not modified).

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SIST EN 61039:2008
- 3 - EN 61039:2008
Annex ZA

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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

Publication Year Title EN/HD Year

IEC/TS 60076-14 2004 Power transformers - - -
Part 14: Design and application of liquid-
immersed power transformers using high-
temperature insulation materials

IEC 60296 2003 Fluids for electrotechnical applications - EN 60296 2004
Unused mineral insulating oils for + corr. September 2004
transformers and switchgear

IEC 60465 1988 Specification for unused insulating mineral EN 60465 1990
oils for cables with oil ducts

IEC 60836 2005 Specifications for unused silicone insulating EN 60836 2005
liquids for electrotechnical purposes

IEC 60867 1993 Insulating liquids - Specifications for unused EN 60867 1994
liquids based on synthetic aromatic

IEC 60963 1988 Specification for unused polybutenes HD 582 S1 1991

IEC 61099 1992 Specification for unused synthetic organic EN 61099 1992
esters for electrical purposes

ISO 1928 1995 Solid mineral fuels - Determination of gross - -
calorific value by the bomb calorimetric
method, and calculation of net calorific value

ISO 2592 2000 Determination of flash and fire points - EN ISO 2592 2001
Cleveland open cup method

ISO 6743-99 2002 Lubricants, industrial oils and related - -
products (class L) - Classification -
Part 99: General

ISO 8681 1986 Petroleum products and lubricants - Method - -
of classification - Definition of classes

OECD 301 1992 OECD guidelines for the testing of - -
chemicals - Ready Biodegradability

ASTM D240-02 - Standard test method for heat of combustion - -
of liquid hydrocarbon fuels by bomb

Undated reference.

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SIST EN 61039:2008

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SIST EN 61039:2008
IEC 61039
Edition 2.0 2008-07

Classification of insulating liquids

Classification des liquides isolants

ICS 29.040.10 ISBN 2-8318-9939-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61039:2008
– 2 – 61039 © IEC:2008
1 Scope.6
2 Normative references .6
3 ISO classification system.7
4 Classification of insulating liquids .7
4.1 Class classification.7
4.2 Category classification .8
4.3 Identifying code.8
5 Summarizing outline .11

Figure 1 – Meaning of all the digits present in the classification of insulating liquids .11

Table 1 – Class classification of petroleum products or related products.8
Table 2 – Examples of classification for different insulating liquids .10

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SIST EN 61039:2008
61039 © IEC:2008 – 3 –


1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61039 has been prepared by IEC technical committee 10: Fluids
for electrotechnical applications.
This second edition cancels and replaces the first edition, published in 1990, and constitutes
a technical revision.
The main change with regard to the previous edition concerns the updating of the
classification of insulating liquids, taking into account the largest number possible of
substances that have, or may have, possible application in electrical components.
The text of this standard is based on the following documents:
FDIS Report on voting

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