IEC TS 60079-43:2017
(Main)Explosive atmospheres - Part 43: Equipment in adverse service conditions
Explosive atmospheres - Part 43: Equipment in adverse service conditions
IEC TS 60079-43:2017(E) which is a Technical Specification, provides guidance for equipment for use in explosive atmospheres in environments which may include ambient temperatures below -20 °С, and additional adverse conditions, including maritime applications. The purpose of this document is to provide recommendations to be considered for the design, manufacture and use of equipment. It is intended that this document be used for equipment operating within the environmental range specified on the certificate for the equipment. This document is intended to be used in conjunction with the IEC 60079 series and the ISO/IEC 80079 series.
Keywords: electrical equipment for use in explosive atmospheres
General Information
Standards Content (Sample)
IEC TS 60079-43 ®
Edition 1.0 2017-11
TECHNICAL
SPECIFICATION
Explosive atmospheres –
Part 43: Equipment in adverse service conditions
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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
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 43: Equipment in adverse service conditions
FOREWORD
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The main task of IEC technical committees is to prepare International Standards. In
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• the required support cannot be obtained for the publication of an International Standard,
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• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC TS 60079-43, which is a technical specification, has been prepared by IEC Technical
committee 31: Equipment for explosive atmospheres.
– 4 – IEC TS 60079-43:2017 © IEC 2017
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
31/1311/DTS 31/1328A/RVDTS
Full information on the voting for the approval of this technical specification 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.
A list of all parts in the IEC 60079 series, published under the general title Explosive
atmospheres, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website 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.
A bilingual version of this publication may be issued at a later date.
INTRODUCTION
IEC 60079-0 specifies the requirements for electrical equipment intended for use in explosive
atmospheres at standard atmospheric conditions:
• temperature –20 °C to +60 °C;
• pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and
• air with normal oxygen content, typically 21 % v/v.
In some cases, other parts of the IEC 60079 series also specify conditions outside the above
range, for example in IEC 60079-1.
IEC 60079-0 states the normal ambient temperature range as –20 °C to +40 °C and states
that electrical equipment designed for use in other than this normal ambient temperature
range is considered to be special and includes additional marking to communicate this to the
user.
IEC 60079-14 includes requirements for users to select and install equipment so that it is
suitable for the env
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