Fluids for electrotechnical applications - Mineral insulating oils for electrical equipment

This document provides specifications and test methods for unused and recycled mineral
insulating oils (see Clause 3 for definitions). It applies to mineral oil delivered according to the
contractual agreement, intended for use in transformers, switchgear and similar electrical
equipment in which oil is required for insulation and heat transfer. Both unused oil and
recycled oil under the scope of this document have not been used in, nor been in contact with
electrical equipment or other equipment not required for manufacture, storage or transport.
Unused oils are obtained by refining, modifying and/or blending of petroleum products and
other hydrocarbons from virgin feedstock.
Recycled oils are produced from oils previously used as mineral insulating oils in electrical
equipment that have been subjected to re-refining or reclaiming (regeneration) by processes
employed offsite. Such oils will have originally been supplied in compliance with a recognized
unused mineral insulating oil specification. This document does not differentiate between the
methods used to recycle mineral insulating oil. Oils treated on-site (see IEC 60422) are not
within the scope of this document.
Oils with and without additives are both within the scope of this document.
This document does not apply to mineral insulating oils used as impregnating medium in
cables or capacitors.

Flüssigkeiten für elektrotechnische Anwendungen - Isolieröle auf Mineralölbasis für elektrische Betriebsmittel

Fluides pour applications électrotechniques - Huiles minérales isolantes pour matériel électrique

L'IEC 60296:2020 énonce les spécifications et méthodes d'essai pour les huiles minérales isolantes neuves et recyclées (voir l'Article 3 pour les définitions). Il s'applique à l'huile minérale livrée dans le cadre d’un accord contractuel, destinée à être utilisée dans les transformateurs, appareillages de connexion et matériels électriques analogues, dans lesquels l'huile est exigée comme fluide isolant et caloporteur. Une huile neuve ou recyclée relevant du domaine d’application du présent document n’a été ni utilisée dans des matériels électriques ni mise à leur contact ou au contact de tout autre matériel non exigé à sa fabrication, son stockage ou son transport. Les huiles neuves sont obtenues par raffinage, modification et/ou mélange de produits pétroliers et d’autres hydrocarbures issus de matières premières vierges. Les huiles recyclées sont produites à partir d'huiles précédemment utilisées comme huiles minérales isolantes dans les matériels électriques et qui ont été soumises à un reraffinage ou à une régénération selon des procédés appliqués hors site. À l'origine, ces huiles ont été fournies conformément à une spécification reconnue relative aux huiles minérales isolantes neuves. Le présent document ne fait pas de distinction entre les méthodes utilisées pour recycler les huiles minérales isolantes. Les huiles traitées sur site (voir l'IEC 60422) ne relèvent pas du domaine d'application du présent document. Le présent document s'applique aux huiles avec ou sans additifs. Le présent document ne concerne pas les huiles minérales isolantes utilisées comme imprégnant dans des câbles ou des condensateurs.

Tekočine za elektrotehniko - Mineralna izolacijska olja za električno opremo

General Information

Status
Published
Publication Date
09-Sep-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Sep-2020
Due Date
12-Nov-2020
Completion Date
10-Sep-2020

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SLOVENSKI STANDARD
SIST EN IEC 60296:2020
01-oktober-2020
Nadomešča:
SIST EN 60296:2012
Tekočine za elektrotehniko - Mineralna izolacijska olja za električno opremo

Fluids for electrotechnical applications - Mineral insulating oils for electrical equipment

Flüssigkeiten für elektrotechnische Anwendungen - Isolieröle auf Mineralölbasis für

elektrische Betriebsmittel

Fluides pour applications électrotechniques - Huiles minérales isolantes pour matériel

électrique
Ta slovenski standard je istoveten z: EN IEC 60296:2020
ICS:
29.040.10 Izolacijska olja Insulating oils
SIST EN IEC 60296:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60296:2020
---------------------- Page: 2 ----------------------
SIST EN IEC 60296:2020
EUROPEAN STANDARD EN IEC 60296
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 29.040.10 Supersedes EN 60296:2012 and all of its amendments
and corrigenda (if any)
English Version
Fluids for electrotechnical applications - Mineral insulating oils
for electrical equipment
(IEC 60296:2020)

Fluides pour applications électrotechniques - Huiles Flüssigkeiten für elektrotechnische Anwendungen -

minérales isolantes pour matériel électrique Isolieröle auf Mineralölbasis für elektrische Betriebsmittel

(IEC 60296:2020) (IEC 60296:2020)

This European Standard was approved by CENELEC on 2020-07-31. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60296:2020 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
European foreword

The text of document 10/1117/FDIS, future edition 5 of IEC 60296, prepared by IEC/TC 10 "Fluids for

electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 60296:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-05-01

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-07-31

document have to be withdrawn

This document supersedes EN 60296:2012 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 60296:2020 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 60076-2 NOTE Harmonized as EN 60076-2
IEC 60590 NOTE Harmonized as HD 382 S1
IEC 60867 NOTE Harmonized as EN 60867
ISO 2592 NOTE Harmonized as EN ISO 2592
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SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60156 - Insulating liquids - Determination of the - -
breakdown voltage at power frequency - Test
method
IEC 60247 - Insulating liquids - Measurement of relative EN 60247 -
permittivity, dielectric dissipation factor (tan d)
and d.c. resistivity
IEC 60422 2013 Mineral insulating oils in electrical equipment - EN 60422 2013
Supervision and maintenance guidance
IEC 60475 - Method of sampling insulating liquids EN 60475 -
IEC 60567 2011 Oil-filled electrical equipment - Sampling of EN 60567 2011
gases and analysis of free and dissolved gases
- Guidance
IEC 60628 1985 Gassing of insulating liquids under electrical HD 488 S1 1987
stress and ionization
IEC 60666 2010 Detection and determination of specified EN 60666 2010
additives in mineral insulating oils
IEC 60814 - Insulating liquids - Oil-impregnated paper and EN 60814 -
pressboard - Determination of water by
automatic coulometric Karl Fischer titration
IEC 60970 - Insulating liquids - Methods for counting and EN 60970 -
sizing particles
IEC 61125 2018 Insulating liquids - Test methods for oxidation EN IEC 61125 2018
stability - Test method for evaluating the
oxidation stability of insulating liquids in the
delivered state
---------------------- Page: 5 ----------------------
SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
Publication Year Title EN/HD Year
IEC 61198 - Mineral insulating oils - Methods for the EN 61198 -
determination of 2-furfural and related
compounds
IEC 61619 - Insulating liquids - Contamination by EN 61619 -
polychlorinated biphenyls (PCBs) - Method of
determination by capillary column gas
chromatography
IEC 61620 - Insulating liquids - Determination of the EN 61620 -
dielectric dissipation factor by measurement of
the conductance and capacitance - Test method
IEC 61868 - Mineral insulating oils - Determination of EN 61868 -
kinematic viscosity at very low temperatures
IEC 62021-1 - Insulating liquids - Determination of acidity - EN 62021-1 -
Part 1: Automatic potentiometric titration
IEC 62021-2 - Insulating liquids - Determination of acidity - EN 62021-2 -
Part 2: Colourimetric titration
IEC 62535 2008 Insulating liquids - Test method for detection of EN 62535 2009
potentially corrosive sulphur in used and
unused insulating oil
IEC 62697-1 - Test methods for quantitative determination of EN 62697-1 -
corrosive sulfur compounds in unused and used
insulating liquids - Part 1: Test method for
quantitative determination of dibenzyldisulfide
(DBDS)
IEC 62961 - Insulating liquids - Test methods for the EN IEC 62961 -
determination of interfacial tension of insulating
liquids - Determination with the ring method
ISO 2049 - Petroleum products - Determination of colour - -
(ASTM scale)
ISO 2719 - Determination of flash point - Pensky-Martens EN ISO 2719 -
closed cup method
ISO 3016 - Petroleum and related products from natural or EN ISO 3016 -
synthetic sources - Determination of pour point
ISO 3104 - Petroleum products - Transparent and opaque EN ISO 3104 -
liquids - Determination of kinematic viscosity
and calculation of dynamic viscosity
ISO 3675 - Crude petroleum and liquid petroleum products EN ISO 3675 -
- Laboratory determination of density -
Hydrometer method
ISO 3819 - Laboratory glassware - Beakers EN ISO 3819 -
---------------------- Page: 6 ----------------------
SIST EN IEC 60296:2020
EN IEC 60296:2020 (E)
Publication Year Title EN/HD Year
ISO 8754 - Petroleum products - Determination of sulphur EN ISO 8754 -
content - Energy-dispersive X-ray fluorescence
spectrometry
ISO 12185 - Crude petroleum and petroleum products - EN ISO 12185 -
Determination of density - Oscillating U-tube
method
ISO 14596 - Petroleum products - Determination of sulphur EN ISO 14596 -
content - Wavelength-dispersive X-ray
fluorescence spectrometry
ASTM D 1500 - Standard Test Method for ASTM Color of - -
Petroleum Products (ASTM Color Scale)
ASTM D 6591 - Standard Test Method for Determination of - -
Aromatic Hydrocarbon Types in Middle
Distillates - High Performance Liquid
Chromatography Method with Refractive Index
Detection
ASTM D 7042 - Standard Test Method for Dynamic Viscosity - -
and Density of Liquids by Stabinger Viscometer
(and the Calculation of Kinematic Viscosity)
ASTM D 7896 - Standard Test Method for Thermal Conductivity, - -
Thermal Diffusivity and Volumetric Heat
Capacity of Engine Coolants and Related Fluids
by Transient Hot Wire Liquid Thermal
Conductivity Method
DIN 51353 - Testing of insulating oils; detection of corrosive - -
sulfur; silver strip test
IP 346 - Determination of polycyclic aromatics in - -
lubricant base oils and asphaltene free
petroleum fractions - Dimethylsulfoxide
refractive method
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SIST EN IEC 60296:2020
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SIST EN IEC 60296:2020
IEC 60296
Edition 5.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside

Fluids for electrotechnical applications – Mineral insulating oils for electrical

equipment
Fluides pour applications électrotechniques – Huiles minérales isolantes pour
matériel électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.10 ISBN 978-2-8322-8377-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 9 ----------------------
SIST EN IEC 60296:2020
– 2 – IEC 60296:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions .................................................................................................... 10

4 Properties of oil ............................................................................................................. 12

4.1 General ................................................................................................................. 12

4.2 Functional properties ............................................................................................ 12

4.3 Production and stability ......................................................................................... 12

4.4 Performance ......................................................................................................... 13

4.5 Health, safety and environment (HSE) properties .................................................. 13

5 Classification, labelling, identification, general delivery requirements and sampling ....... 13

5.1 Classification and labelling .................................................................................... 13

5.1.1 Classes ......................................................................................................... 13

5.1.2 Antioxidant (oxidation inhibitor) content ......................................................... 13

5.1.3 Lowest cold start energizing temperature (LCSET) ........................................ 14

5.1.4 Labelling and ordering designation ................................................................ 14

5.2 Requirements ....................................................................................................... 14

5.3 Miscibility and compatibility ................................................................................... 14

5.4 Identification and general delivery requirements ................................................... 15

5.5 Sampling............................................................................................................... 15

6 Properties, their significance and test methods .............................................................. 15

6.1 Viscosity ............................................................................................................... 15

6.2 Pour point ............................................................................................................. 16

6.3 Water content ....................................................................................................... 16

6.4 Breakdown voltage ............................................................................................... 16

6.5 Density ................................................................................................................. 16

6.6 Dielectric dissipation factor (DDF) ......................................................................... 17

6.7 Colour and appearance ......................................................................................... 17

6.8 Acidity ................................................................................................................... 17

6.9 Interfacial tension (IFT) ......................................................................................... 17

6.10 Sulphur content..................................................................................................... 17

6.11 Corrosive and potentially corrosive sulphur ........................................................... 17

6.12 Additives (see 3.3) ................................................................................................ 18

6.12.1 General ......................................................................................................... 18

6.12.2 Antioxidants (see 3.4) .................................................................................... 18

6.12.3 Metal passivators........................................................................................... 18

6.12.4 Pour point depressants .................................................................................. 18

6.13 Oxidation stability ................................................................................................. 19

6.14 Flash point ............................................................................................................ 19

6.15 Polycyclic aromatics (PCAs) and polyaromatic hydrocarbons (PAHs) .................... 19

6.16 Polychlorinated biphenyl content (PCBs)............................................................... 19

6.17 2-furfural (2-FAL) and related compounds content ................................................ 19

6.18 DBDS content ....................................................................................................... 20

6.19 Stray gassing under thermo-oxidative stress ......................................................... 20

7 Additional properties ...................................................................................................... 24

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SIST EN IEC 60296:2020
IEC 60296:2020 © IEC 2020 – 3 –

7.1 General ................................................................................................................. 24

7.2 Electrostatic charging tendency (ECT) .................................................................. 24

7.3 Gassing tendency ................................................................................................. 24

7.4 Thermal properties ................................................................................................ 25

7.5 Properties connected with consistency (aromatic content, distribution of

PAHs, refractive index) ......................................................................................... 25

7.6 Lubricating properties ........................................................................................... 25

7.7 Particle content ..................................................................................................... 25

7.8 Foaming................................................................................................................ 25

7.9 Transformer oil test equivalents ............................................................................ 25

Annex A (normative) Method for stray gassing under thermo-oxidative stress ...................... 26

A.1 Overview of the method ........................................................................................ 26

A.2 Required materials ................................................................................................ 26

A.3 Pretreatment of syringes ....................................................................................... 26

A.4 Procedure A: stray gassing under oxidative conditions (high oxygen content) ....... 27

A.4.1 Pretreatment of mineral oil ............................................................................. 27

A.4.2 Filling syringes with mineral oil ...................................................................... 27

A.4.3 Incubation procedure ..................................................................................... 27

A.4.4 Dissolved gas analysis .................................................................................. 27

A.5 Procedure B: stray gassing under inert conditions (low oxygen content) ............... 27

A.6 Reporting .............................................................................................................. 28

A.6.1 Test report ..................................................................................................... 28

A.6.2 Evaluation of the stray gassing behaviour of the oil ....................................... 28

A.7 Precision data ....................................................................................................... 28

A.7.1 General ......................................................................................................... 28

A.7.2 Repeatability ................................................................................................. 28

A.7.3 Reproducibility ............................................................................................... 28

A.8 Results of the RRT................................................................................................ 29

A.8.1 General ......................................................................................................... 29

A.8.2 Stray gassing pattern 1 .................................................................................. 29

A.8.3 Stray gassing pattern 2 .................................................................................. 30

A.8.4 Stray gassing pattern 3 .................................................................................. 31

A.8.5 Stray gassing pattern 4 .................................................................................. 32

Annex B (informative) Potentially corrosive sulphur ............................................................. 33

B.1 Mechanism of copper sulphide deposition ............................................................. 33

B.2 Corrosive sulphur compounds in oil ...................................................................... 33

B.3 Detection of corrosive sulphur compounds in oils containing passivators .............. 33

B.3.1 General ......................................................................................................... 33

B.3.2 Procedure 1 ................................................................................................... 34

B.3.3 Procedure 2 ................................................................................................... 34

Annex C (informative) Contamination of oils with silicone..................................................... 35

Annex D (informative) Transformer oil test equivalents ........................................................ 36

Bibliography .......................................................................................................................... 38

Figure A.1 – Syringes with and without copper ...................................................................... 27

Figure A.2 – Stray gassing pattern 1 ..................................................................................... 29

Figure A.3 – Stray gassing pattern 2 ..................................................................................... 30

Figure A.4 – Stray gassing pattern 3 ..................................................................................... 31

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SIST EN IEC 60296:2020
– 4 – IEC 60296:2020 © IEC 2020

Figure A.5 – Stray gassing pattern 4 ..................................................................................... 32

Table 1 – Meaning of the identifying letter codes in the ordering designation of mineral

oil according to IEC 60296 .................................................................................................... 14

Table 2 – Maximum viscosity and pour point of mineral insulating oil .................................... 16

Table 3 – General specifications, Type A (fully inhibited high grade oils) .............................. 21

Table 4 – General specifications, Type B (uninhibited and inhibited

standard grade oils) .............................................................................................................. 23

Table D.1 – Some transformer oil test equivalents ................................................................ 36

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SIST EN IEC 60296:2020
IEC 60296:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
MINERAL INSULATING OILS FOR ELECTRICAL EQUIPMENT
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

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 60296 has been prepared by IEC technical committee 10: Fluids

for electrotechnical applications.

This fifth edition cancels and replaces the fourth edition published in 2012. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

– This International Standard is applicable to specifications and test methods for unused

and recycled mineral insulating oils in the delivered state.

– Within the transformer insulating oils, two groups, Type A and Type B, are defined, based

on their performance.

– A new method for stray gassing under thermo-oxidative stress of mineral insulating oils,

which has been tested in a joint round robin test (RRT) between CIGRE D1 and
IEC technical committee 10, has been included.
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SIST EN IEC 60296:2020
– 6 – IEC 60296:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
10/1117/FDIS 10/1118/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related

to the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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SIST EN IEC 60296:2020
IEC 60296:2020 © IEC 2020 – 7 –
INTRODUCTION

WARNING – This document does not purport to address all the safety problems associated

with its use. It is the responsibility of the user of this document to establish appropriate health

and safety practices and determine the applicability of regulatory limitations prior to use.

The mineral insulating oils which are the subject of this document should be handled in

compliance with local regulations and suppliers safety data-sheets.

This document is applicable to mineral insulating oils, chemicals and used sample containers.

The disposal of these items should be carried out according to local regulations with regard to

their impact on the environment.
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SIST EN IEC 60296:2020
– 8 – IEC 60296:2020 © IEC 2020
FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
MINERAL INSULATING OILS FOR ELECTRICAL EQUIPMENT
1 Scope

This document provides specifications and test methods for unused and recycled mineral

insulating oils (see Clause 3
...

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