CLC IEC/TS 60079-43:2021

SLOVENSKI STANDARD
01-julij-2021
Eksplozivne atmosfere - 43. del: Oprema za neugodne delovne pogoje (IEC/TS
60079-43:2017)
Explosive atmospheres - Part 43: Equipment in adverse service conditions (IEC/TS
60079-43:2017)
Explosionsgefährdete Bereiche - Teil 43: Geräte bei ungünstigen Betriebsbedingungen
(IEC/TS 60079-43:2017)
Atmosphères explosives - Partie 43 : Matériel en conditions de service défavorables
(IEC/TS 60079-43:2017)
Ta slovenski standard je istoveten z: CLC IEC/TS 60079-43:2021
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC IEC/TS 60079-43

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
April 2021
ICS 29.260.20
English Version
Explosive atmospheres - Part 43: Equipment in adverse service
conditions
(IEC/TS 60079-43:2017)
Atmosphères explosives - Partie 43 : Matériel en conditions Explosionsgefährdete Bereiche - Teil 43: Geräte bei
de service défavorables ungünstigen Betriebsbedingungen
(IEC/TS 60079-43:2017) (IEC/TS 60079-43:2017)
This Technical Specification was approved by CENELEC on 2021-04-19.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC IEC/TS 60079-43:2021 E

European foreword
This document (CLC IEC/TS 60079-43:2021) consists of the text of IEC TS 60079-43:2017 prepared
by IEC/TC 31 "Equipment for explosive atmospheres".
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 Technical Specification IEC/TS 60079-43:2017 was approved by
CENELEC as a European Technical Specification without any modification.

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 60034-5 - Rotating electrical machines - Part 5: EN IEC 60034-5 -
Degrees of protection provided by the
integral design of rotating electrical
machines (IP code) - Classification
IEC 60068 series Environmental testing EN 60068 series
IEC 60079-0 - Explosive atmospheres - Part 0: EN IEC 60079-0 -
Equipment - General requirements
IEC 60079-11 - Explosive atmospheres - Part 11: EN 60079-11 -
Equipment protection by intrinsic safety "i"
IEC 60079-14 - Explosive atmospheres - Part 14: Electrical EN 60079-14 -
installations design, selection and erection
IEC 60079-17 - Explosive atmospheres - Part 17: Electrical EN 60079-17 -
installations inspection and maintenance
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60721-1 - Classification of environmental conditions - EN 60721-1 -
Part 1: Environmental parameters and
their severities
IEC 60721-2-1 - Classification of environmental conditions - EN 60721-2-1 -
Part 2-1: Environmental conditions
appearing in nature - Temperature and
humidity
IEC/TR 60721-4 series Classification of environmental conditions - - -

IEC TS 60079-43 ®
Edition 1.0 2017-11
TECHNICAL
SPECIFICATION
Explosive atmospheres –
Part 43: Equipment in adverse service conditions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-5011-2

– 2 – IEC TS 60079-43:2017 © IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Environmental conditions affecting the equipment used in explosive atmospheres . 7
4.1 General . 7
4.2 Low temperature effects . 7
4.3 Other environmental effects . 8
5 Recommendations for design of equipment . 8
5.1 General . 8
5.2 Atmospheres containing salt and chlorides . 9
5.3 Snow conditions . 9
5.4 Solar Radiation . 9
5.5 Mechanical integrity . 9
5.6 Icing and winterization . 10
5.7 Impact of rapid cooling . 10
6 Impact of low temperatures on types of protection . 10
6.1 General . 10
6.2 Intrinsic safety "i" . 10
6.3 Flameproof enclosure "d" . 11
6.4 Pressurized enclosure "p" . 11
6.5 Liquid immersion "o" . 11
7 Selection, installation and use of equipment . 11
7.1 Limited functionality . 11
7.2 Cables and cable glands . 11
7.3 Seals and sealing materials . 12
8 Maintenance of equipment . 12
9 Hazardous area classification . 12
Annex A (informative) Recommendations on materials . 13
Annex B (informative) Solar radiation . 14
B.1 General . 14
B.2 Temperature gradients . 14
B.3 Recommendations . 14
B.3.1 Cables and glands . 14
B.3.2 Equipment . 14
B.3.3 Protective measures . 14
Annex C (informative) Electric motors in low temperatures . 15
C.1 General . 15
C.2 Explosion-protection . 15
C.3 Factors that may affect design and performance . 15
Bibliography . 17

IEC TS 60079-43:2017 © IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 43: Equipment in adverse service conditions

FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. In
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• the required support cannot be obtai
...