EN 60079-6:2015

SLOVENSKI STANDARD
01-april-2016
1DGRPHãþD
SIST EN 60079-6:2007
(NVSOR]LYQHDWPRVIHUHGHO=DãþLWDRSUHPHVSRWRSLWYLMRYROMHR,(&

Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o" (IEC
60079-6:2015)
Explosionsgefährdete Bereiche - Teil 6: Geräteschutz durch Flüssigkeitskapselung
"o" (IEC 60079-6:2015)
Atmosphères explosives - Partie 6: Protection du matériel par immersion dans le liquide
"o" (IEC 60079-6:2015)
Ta slovenski standard je istoveten z: EN 60079-6:2015
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60079-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2015
ICS 29.260.20 Supersedes EN 60079-6:2007
English Version
Explosive atmospheres - Part 6: Equipment protection by liquid
immersion "o"
(IEC 60079-6:2015)
Atmosphères explosives - Partie 6: Protection du matériel Explosionsgefährdete Bereiche - Teil 6: Geräteschutz durch
par immersion dans le liquide "o" Flüssigkeitskapselung "o"
(IEC 60079-6:2015) (IEC 60079-6:2015)
This European Standard was approved by CENELEC on 2015-03-27. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60079-6:2015 E
European foreword
The text of document 31/1157/FDIS, future edition 4 of IEC 60079-6, prepared by IEC/TC 31
"Equipment for explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60079-6:2015.

The following dates are fixed:
(dop) 2016-06-11
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2018-03-27
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60079-6:2007.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 60079-6:2015 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 60079 series NOTE  Harmonized in the series EN 60079.
IEC 62770 NOTE  Harmonized as EN 62770.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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 60079-0 -  Explosive atmospheres -- Part 0: EN 60079-0 -
Equipment - General requirements
IEC 60156 -  Insulating liquids - Determination of the EN 60156 -
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 60296 -  Fluids for electrotechnical applications - EN 60296 -
Unused mineral insulating oils for
transformers and switchgear
IEC 60529 -  Degrees of protection provided by - -
enclosures (IP Code)
IEC 60814 -  Insulating liquids - Oil-impregnated paper EN 60814 -
and pressboard - Determination of water
by automatic coulometric Karl Fischer
titration
IEC 60836 -  Specifications for unused silicone EN 60836 -
insulating liquids for electrotechnical
purposes
IEC 61099 -  Insulating liquids - Specifications for EN 61099 -
unused synthetic organic esters for
electrical purposes
IEC 61125 -  EN 61125 -
IEC 62021-1 -  Insulating liquids - Determination of acidity EN 62021-1 -
-- Part 1: Automatic potentiometric titration
IEC 62535 -  Insulating liquids - Test method for EN 62535 -
detection of potentially corrosive sulphur in
used and unused insulating oil
ISO 2592 -  Determination of flash and fire points - EN ISO 2592 -
Cleveland open cup method
ISO 2719 -  Determination of flash point - Pensky- EN ISO 2719 -
Martens closed cup method
ISO 3016 -  Petroleum products - Determination of - -
pour point
ISO 3104 -  Petroleum products - Transparent and EN ISO 3104 -
opaque liquids - Determination of
kinematic viscosity and calculation of
dynamic viscosity
Annex ZZ
(informative)
Relationship between this European standard and the essential requirements of
Directive 94/9/EC aimed to be covered

This European standard has been prepared under a Commission’s standardisation request to provide
one voluntary means of conforming to essential of Directive 94/9/EC of the European Parliament and
the Council of 23 March 1994 on the approximation of the laws of the Member States concerning
equipment and protective systems intended for use in potentially explosive atmospheres.

Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.

Table ZZ.1 – Correspondence between this European standard and Annex II of Directive
94/9/EC
Essential Requirements of Clause(s) / sub-clause(s)
Remarks / Notes
Directive of this EN
1.0.1. 4, 5
1.0.2. 4
1.0.3. 7, 8
1.0.4. Not covered
1.0.5. 7
1.0.6. 8
1.1.1. 4, 5
1.1.2. 4, 5
1.1.3. 5
1.2.1. 4, 5
1.2.2. 4
1.2.3. Not covered
1.2.4. 4
1.2.5. Not covered
1.2.6. 4.5
1.2.7. Not covered
1.2.8. Not covered
1.2.9. Not covered
1.3.1. All Covered by the principle of the
type of protection "o":
Immersion of potential ignition
sources in oil.
1.3.2. 4.5
1.3.3. Not covered
1.3.4. Not covered
1.3.5. Not covered
1.4.1. 4
1.4.2. 4
1.5.1 4.5, 4.6, 4.7
1.5.2. Not covered
1.5.3. Not covered
1.5.4. 4.6, 4.7
1.5.5. 4.6, 4.7
1.5.6. Not covered
1.5.7. Not covered
1.5.8. Not covered
1.6.1. Not covered
1.6.2. Not covered
1.6.3. Not covered
1.6.4. 4.9
1.6.5. Not covered
2.0.1.1. 4, 5
2.0.1.2. 4.5
2.0.1.3. 4.8
2.0.1.4. Not covered
2.0.2.1. 4.1, 4.8
2.0.2.2. 4.5
2.0.2.3 4.5 and
2.1.1.1. 4, 5
2.1.1.2. 4.8
2.1.1.3. 4.5
2.1.2.1. 4, 5
2.1.2.2. Not covered
2.1.2.3. Not covered
2.2.1.1. 4.1, 4.2.2, 4.5
2.2.1.2. 4.8
2.2.1.3. 4.5 and
2.2.2.1 4.1, 4.2.2, 4.5
2.2.2.2. Not covered
2.2.2.3. Not covered
2.2.2.4. Not covered
2.3.1.1. 4.1, 4.2.3, 4.5
2.3.1.2. 4.8
2.3.2.1. 4.1, 4.2.3, 4.5
2.3.2.2. 4.8
2.3.2.3. Not covered
3.0.1. Not covered
3.0.2. Not covered
3.0.3. Not covered
3.0.4. Not covered
3.1.1. Not covered
3.1.2. Not covered
3.1.3. Not covered
3.1.4. Not covered
3.1.5. Not covered
3.1.6. Not covered
3.1.7. Not covered
3.1.8. Not covered
WARNING 1: Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2: Other Union legislation may be applicable to the product falling within the scope of this
standard.
IEC 60079-6 ®
Edition 4.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 6: Equipment protection by liquid immersion "o"

Atmosphères explosives –
Partie 6: Protection du matériel par immersion dans le liquide "o"

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-2251-5

– 2 – IEC 60079-6:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Constructional requirements . 8
4.1 General . 8
4.2 Levels of protection and requirements of electrical equipment . 8
4.2.1 Level of Protection . 8
4.2.2 Requirements for Level of Protection “ob” . 9
4.2.3 Requirements for Level of Protection “oc” . 9
4.3 Switching device . 9
4.4 Creepage and clearance . 9
4.5 Liquid containment enclosures. 10
4.5.1 General . 10
4.5.2 Sealed enclosures . 10
4.5.3 Unsealed enclosures . 10
4.5.4 Outlet of breathing device or pressure relief device . 10
4.5.5 Enclosures intended to be opened . 10
4.5.6 Determination of the maximum/minimum criteria of the protective liquid . 10
4.6 Immersion depth . 11
4.7 Protective liquid level indication . 11
4.7.1 General . 11
4.7.2 Remote-indicating protective liquid level indicator . 12
4.7.3 Safety devices for Level of Protection “ob” . 12
4.8 Temperature limitations . 12
4.8.1 General . 12
4.8.2 Maximum Surface Temperature . 12
4.8.3 Flashpoint of the protective liquid .
...