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
Current Stage
PPUB - Publication issued
Start Date
31-Aug-2017
Completion Date
31-Aug-2017
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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
IEC TS 60079-46:2017-08 (en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
IEC TS 60079-46:2017 © IEC 2017 – 3 –
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.

This bilingual version (2018-10) corresponds to the monolingual English version, published in

2017-08.
---------------------- Page: 5 ----------------------
– 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.
The French version of this technical specification has not been voted upon.

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.
---------------------- Page: 6 ----------------------
IEC TS 60079-46:2017 © IEC 2017 – 5 –
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 interconnection of the items of equipment form an assembly

that also meets other parts of the ISO 80079 and IEC 60079 series.

This document is intended to be used for verification of assemblies to assist in ensuring

products are in compliance with the requirements of the ISO 80079 and IEC 60079 series at

the time of initial installation at the end user site.

After the initial installation, the assembly is considered as part of the site installation in

accordance with other parts of the ISO 80079 and IEC 60079 series.
---------------------- Page: 7 ----------------------
– 6 – IEC TS 60079-46:2017 © IEC 2017
EXPLOSIVE ATMOSPHERES –
Part 46: Equipment assemblies
1 Scope

This part of IEC 60079, which is a technical specification, 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.

NOTE 1 Additional guidance on the requirements for hazards due to hybrid mixtures of dust or flyings and

flammable gas or vapour is provided in IEC 60079-14.

Where a requirement of this document conflicts with a requirement of either IEC 60079-0 or

ISO 80079-36, the requirement of this document takes precedence.

NOTE 2 For this first edition, the only requirements of this document that take precedence over IEC 60079-0 or

ISO 80079-36 are the markings for equipment assemblies.
---------------------- Page: 8 ----------------------
IEC TS 60079-46:2017 © IEC 2017 – 7 –
2 Normative references

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.
IEC 60079 (all parts), Explosive atmospheres
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements

IEC 60079-10-1, Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas

atmospheres

IEC 60079-10-2, Explosive atmospheres – Part 10-2: Classification of areas – Explosive dust

atmospheres

IEC 60079-14, Explosive atmospheres – Part 14: Electrical installations design, selection and

erection

IEC 60079-25, Explosive atmospheres – Part 25: Intrinsically safe electrical systems

ISO 80079 (all parts), Explosive atmospheres

ISO/IEC 80079-34, Explosive atmospheres – Part 34: Application of quality systems for

equipment manufacture

ISO 80079-36, Explosive atmospheres – Part 36: Non-electrical equipment for explosive

atmospheres – Basic method and requirements
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60079-0,

IEC 60079-14, ISO 80079-36 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
equipment assembly

pre-manufactured combination of Ex Equipment, together with other parts as necessary, that

are electrically or mechanically interconnected that are pre-assembled prior to being placed

into service at the end-user site, and that can be disassembled and then re-assembled at the

end-user site
3.2
equipment assembly certificate

document that conveys the assurance of the conformity of an equipment assembly with

specified requirements

Note 1 to entry: The certificate is either the supplier’s declaration of conformity or the purchaser’s recognition of

conformity or certification (as a result of action by a third party) as defined in ISO/IEC 17000:2004, definition 2.

---------------------- Page: 9 ----------------------
– 8 – IEC TS 60079-46:2017 © IEC 2017
3.3
pre-manufactured
equipment assembly produced at any location(s) other than the end-user site
4 General requirements for equipment assemblies
4.1 General specifications

The equipment assembly shall be verified for suitability against the requirements of this

document, IEC 60079-0, IEC 60079-14 and ISO 80079-36 as applicable.

The general specifications may be provided by the end-user or by the manufacturer for the

intended use of the equipment assembly and shall cover the following as a minimum:

– manufacturer’s unique equipment assembly identifier (e.g. serial number);
– input and output ratings;

– intended environmental conditions, including ambient temperature range and ingress

protection;
– applicable explosion protection codes, standards and regulations;
– utility-related issues, including power supply;
– any requirements for items to be used in the equipment assembly;
– process conditions, including fluids, pressures, duty;
– external sources of heating and cooling;

– external interface parameters (e.g. for intrinsic safety, controls, shutdowns and interlocks,

including details regarding failure modes).

These general specifications related to the application of the equipment assembly shall be

documented by the manufacturer.
4.2 Explosion protection specifications

In addition to the general specifications of 4.1, if not specified as part of them, the

manufacturer shall document the following specifications related to the installation of the

equipment assembly by the end-user:

– default equipment protection level (EPL) as defined in IEC 60079-14, as a minimum

requirement;
– equipment Group;
– temperature classification or maximum surface temperature;
– allowances for dust layers as applicable;
– Specific Conditions of Use (“X” conditions).
4.3 Hazardous area classification related to the equipment assembly
4.3.1 General

There are two aspects of area classification that can impact equipment assemblies. The first

is due to the area in which the equipment assembly is to be installed, and the second is due

to any source of release from the equipment assembly.

It is not a requirement of this document to verify either of these area classifications.

The manufacturer shall document the suitability of the equipment assembly for the intended

end-site hazardous area classification and for the defined installation conditions.

---------------------- Page: 10 ----------------------
IEC TS 60079-46:2017 © IEC 2017 – 9 –
4.3.2 Equipment assembly with its own source of release

If the equipment assembly has its own source of release, the manufacturer shall also

document:

– the hazardous area classification identifying any source of release, factors relevant to the

sources of release (e.g. release rate, orifice size, operating mode, failure mode,

recommendation for management of the hazard) and any other information relevant to

quantifying the hazard and the methodology and any references used to arrive at the

classification;

– any conditions defined by the manufacturer such that the suitability of the equipment

assembly for the hazardous area classification remains valid.

The classification of hazardous areas shall be in accordance with IEC 60079-10-1 or

IEC 60079-10-2 as applicable. This classification may be provided by the end-user.

4.4 Competencies

For equipment assemblies subjected to type verification, the manufacturing process and the

competency of the related personnel shall conform to ISO/IEC 80079-34.

For equipment assemblies subjected to unit verification, competency of the personnel

performing the production processes is verified by conformity of the equipment assembly with

this document. The verifying party shall be competent in the explosion protection aspects of

the assembly being verified.

When equipment assemblies are subjected to unit verification, the verifying party shall have

evidence of competency through an independent party or system.

Documentation regarding the above shall be included with each equipment assembly.

NOTE An example of suitable documentation to demonstrate the competency required for type verification would

be a record of current assessment to ISO/IEC 80079-34 by a competent third-party assessor, and for unit

verification it could be a current certificate issued by a competent third-party assessor.

5 Design of equipment assemblies
5.1 General

The selection, installation and inspection of the electrical equipment in an assembly shall be

in accordance with IEC 60079-14, except as modified by this document.
5.2 Ex Equipment
5.2.1 Individual items

Individual items that comprise the equipment assembly shall conform to the IEC 60079 series

or ISO 80079 series standards based on the associated ignition risks, and shall have

individual Ex Equipment certificates or be assessed as part of the assembly.

All individual items shall be suitably rated for the application and be utilized in accordance

with the manufacturer’s instructions.

Where items other than suitably rated Ex Equipment were not separately assessed as part of

Ex Equipment, an assessment, including further tests according IEC 60079 series or

ISO 80079 series standards if necessary, shall be made as part of the equipment assembly

evaluation.

NOTE Items other than Ex Equipment can include, for example, Ex Components, simple apparatus, general

industrial products within an Ex “d” or Ex “p” enclosure, Group I equipment used in a Group II application.

---------------------- Page: 11 ----------------------
– 10 – IEC TS 60079-46:2017 © IEC 2017
5.2.2 Specific Conditions of Use as specified on certificates

All Specific Conditions of Use as specified on equipment certificates shall be considered and

their application documented by the manufacturer as follows:

– If directly related to the equipment assembly, how they were satisfied in the equipment

assembly.

– If directly related to the equipment assembly, but not satisfied in the equipment assembly,

how they will be able to be satisfied in the end-user site installation.
– If not directly related to the equipment assembly, why they
...

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