IEC TS 60079-46:2017

Explosive atmospheres - Part 46: Equipment assemblies

IEC TS 60079-46:2017 specifies requirements for the design, construction, assembly, testing, inspection, marking, documenting and assessment of equipment assemblies for use in explosive atmospheres under the responsibility of the manufacturer of the equipment assembly. The requirements of this document apply to individual items according to the IEC 60079 series or ISO 80079 series that comprise the assembly and that have individual certificates. These individual items are then integrated as part of the equipment assembly. Also included are requirements to address aspects for the assembly which may be beyond the certificates of the individual items forming the assembly. The scope of this document includes assessment of the additional requirements for assemblies for hazardous areas and does not include requirements for non-hazardous areas. It is assumed that compliance with other electrical or mechanical requirements that are applicable for non-hazardous areas will be verified by either the same or different party in addition to the requirements of this document. This document does not apply to:
- equipment which is covered, in its entirety, by one or more IEC 60079 and ISO 80079 equipment types of protection;
- pressurized rooms, “p”, in accordance with IEC 60079-13, artificial ventilation for the protection of analyzer(s) houses in accordance with IEC TR 60079-16, and other standards addressing specific Ex assemblies;
- installation at the end-user site under the scope of IEC 60079-14;
- classification of the hazardous area;
- equipment assemblies for mines susceptible to firedamp (Group I applications);
- inherently explosive situations and dust from explosives or pyrophoric substances (for example explosives manufacturing and processing);
- rooms used for medical purposes;
- electrical installations in areas where the hazard is due to flammable mist.
The specification is only intended to provide validation for the initial supply of an assembly.
Keywords: equipment assemblies for use in explosive atmospheres

Atmosphères explosives - Partie 46: Assemblages d'appareils

IEC TS 60079-46:2017 spécifie les exigences relatives à la conception, à la construction, à l’assemblage, aux essais, aux inspections, au marquage, à la documentation et à l’évaluation des assemblages d’appareils destinés à être utilisés en atmosphères explosives, sous la responsabilité du fabricant de l’assemblage d’appareils.
Les exigences du présent document s’appliquent aux éléments individuels conformément aux séries IEC 60079 ou ISO 80079 qui composent l’assemblage et qui disposent de certificats individuels. Ces éléments individuels sont ensuite intégrés en tant que partie de l’assemblage d’appareils. Sont également incluses des exigences concernant des aspects de l’assemblage qui peuvent aller au-delà des certificats des éléments individuels formant l’assemblage.
Le domaine d’application du présent document inclut l’évaluation des exigences supplémentaires applicables aux assemblages pour des emplacements dangereux et n'inclut pas d’exigences pour les emplacements non dangereux. Il est supposé que la conformité à d’autres exigences électriques ou mécaniques applicables pour des emplacements non dangereux sera vérifiée par la même partie ou par une autre partie, en complément des exigences du présent document.
Le présent document ne s’applique pas:
- aux appareils qui sont couverts, dans leur intégralité, par un ou plusieurs modes de protection d’appareils conformes à l’IEC 60079 et à l’ISO 80079;
- aux salles à surpression interne, «p», conformes à l’IEC 60079-13, à la ventilation artificielle pour la protection des bâtiments pour analyseur(s) conforme à l’IEC TR 60079 16, et à d’autres normes traitant d’assemblages Ex spécifiques;
- à l’installation sur le site de l’utilisateur final, qui relève du domaine d’application de l’IEC 60079-14;
- au classement de l’emplacement dangereux;
- aux assemblages d’appareils pour les mines grisouteuses (applications du Groupe I);
- aux situations intrinsèquement explosives et aux poussières issues de substances explosives ou pyrophoriques (la fabrication et le traitement d’explosifs, par exemple);
- aux salles utilisées à des fins médicales;
- aux installations électriques situées dans des emplacements où le danger provient d'un brouillard inflammable.
La spécification est destinée uniquement à assurer la validation de la fourniture initiale d'un assemblage.

General Information

• Status: Published
• Publication Date: 30-Aug-2017
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.040.10 - Insulating oils
• ICS: 29.080.20 - Bushings
• ICS: 29.080.99 - Other standards related to insulation
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: TC 31 - Equipment for explosive atmospheres
• Drafting Committee: MT 60079-46 - TC 31/MT 60079-46
• Current Stage: PPUB - Publication issued
• Start Date: 26-Sep-2017
• Completion Date: 31-Aug-2017

Standards Content (Sample)

IEC TS 60079-46 ®
Edition 1.0 2017-08
TECHNICAL
SPECIFICATION
Explosive atmospheres –
Part 46: Equipment assemblies
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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3, rue de Varembé Fax: [phone]
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Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
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latest edition, a corrigenda or an amendment might have been published.

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IEC TS 60079-46 ®
Edition 1.0 2017-08
TECHNICAL
SPECIFICATION
Explosive atmospheres –
Part 46: Equipment assemblies
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-4763-1

– 2 – IEC TS 60079-46:2017 © IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 General requirements for equipment assemblies . 8
4.1 General specifications . 8
4.2 Explosion protection specifications . 8
4.3 Hazardous area classification related to the equipment assembly . 8
4.3.1 General . 8
4.3.2 Equipment assembly with its own source of release . 9
4.4 Competencies . 9
5 Design of equipment assemblies . 9
5.1 General . 9
5.2 Ex Equipment . 9
5.2.1 Individual items . 9
5.2.2 Specific Conditions of Use as specified on certificates . 10
5.2.3 Item list . 10
5.3 Other items . 10
5.4 Wiring system . 10
5.5 Drawings. 11
6 Construction and assembly . 11
6.1 General . 11
6.2 Disassembly and reassembly . 11
6.3 System interfaces . 12
6.4 Ignition hazard assessment . 12
6.5 Calculations . 12
6.6 Inspection & testing . 12
6.7 Validation and documentation . 13
6.7.1 General . 13
6.7.2 Other material specifications . 14
6.7.3 Schedule Documents . 14
6.8 Instructions . 14
7 Certificate . 14
8 Marking . 15
8.1 General . 15
8.2 Determining Group marking . 15
8.3 Determining temperature class or maximum surface temperature marking . 16
8.4 Determining Equipment Protection Level (EPL) marking. 16
8.5 Determining ambient temperature range marking . 16
8.6 Determining ingress protection (IP Code) rating . 16

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 46: Equipment assemblies
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.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• 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 60079-46, which is a technical specification, has been prepared by IEC technical
committee TC 31: Equipment for explosive atmospheres.

– 4 – IEC TS 60079-46:2017 © IEC 2017
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
31/1312/DTS 31/1327/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 publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

INTRODUCTION
The provision of products into end markets for installation by end users may take the form of
either individual items of equipment or pre-manufactured assemblies comprising many items
of equipment. Pre-manufactured equipment assemblies may be as either subsystems
requiring integration as part of an installation at a site or complete functional machines which
require little or no additional reassembly on site.
This document is applied when assembly of Ex Equipment(s) results in an assembly that
creates a need for additional assessment that is not already completely covered by the
individual equipment certificates. Additional assessment might include (but is not limited to)
evaluation of wiring methods used to connect the equipment(s) or temperature rise within the
assembly.
This document provides requirements for the design, construction, assembly, testing,
inspection, marking, documenting and assessment of equipment assemblies such that the
items of Ex Equipment and the interc
...

IEC TS 60079-46 ®
Edition 1.0 2017-08
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
Explosive atmospheres –
Part 46: Equipment assemblies
Atmosphères explosives –
Partie 46: Assemblages d’appareils

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

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documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
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IEC TS 60079-46 ®
Edition 1.0 2017-08
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
Explosive atmospheres –
Part 46: Equipment assemblies
Atmosphères explosives –
Partie 46: Assemblages d’appareils

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-6108-8

– 2 – IEC TS 60079-46:2017 © IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 General requirements for equipment assemblies . 8
4.1 General specifications . 8
4.2 Explosion protection specifications . 8
4.3 Hazardous area classification related to the equipment assembly . 8
4.3.1 General . 8
4.3.2 Equipment assembly with its own source of release . 9
4.4 Competencies . 9
5 Design of equipment assemblies . 9
5.1 General . 9
5.2 Ex Equipment . 9
5.2.1 Individual items . 9
5.2.2 Specific Conditions of Use as specified on certificates . 10
5.2.3 Item list . 10
5.3 Other items . 10
5.4 Wiring system . 10
5.5 Drawings. 11
6 Construction and assembly . 11
6.1 General . 11
6.2 Disassembly and reassembly . 11
6.3 System interfaces . 12
6.4 Ignition hazard assessment . 12
6.5 Calculations . 12
6.6 Inspection & testing . 12
6.7 Validation and documentation . 13
6.7.1 General . 13
6.7.2 Other material specifications . 14
6.7.3 Schedule Documents . 14
6.8 Instructions . 14
7 Certificate . 14
8 Marking . 15
8.1 General . 15
8.2 Determining Group marking . 15
8.3 Determining temperature class or maximum surface temperature marking . 16
8.4 Determining Equipment Protection Level (EPL) marking. 16
8.5 Determining ambient temperature range marking . 16
8.6 Determining ingress protection (IP Code) rating . 16

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 46: Equipment assemblies
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
...