EN ISO 80079-36:2016

Explosive atmospheres - Part 36: Non-electrical equipment for explosive atmospheres - Basic method and requirements (ISO 80079-36:2016)

ISO 80079-36:2016 specifies the basic method and requirements for design, construction, testing and marking of non-electrical Ex equipment, Ex Components, protective systems, devices and assemblies
of these products that have their own potential ignition sources and are intended for use in explosive atmospheres. Hand tools and manually operated equipment without energy storage are excluded from the scope of this standard. This standard does not address the safety of static autonomous process equipment when it is not part of equipment referred to in this standard. This standard does not specify requirements for safety, other than those directly related to the risk of ignition which may then lead to an explosion. The standard atmospheric conditions (relating to the explosion    characteristics of the atmosphere) under which it may be assumed that equipment can be operated are:
- 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. Such atmospheres can also exist inside the equipment. In addition, the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment's internal operating pressure, and/or temperature. This part of ISO/IEC 80079 specifies the requirements for the design and      
construction of equipment, intended for explosive atmospheres in conformity with all Equipment Protection Levels (EPLs) of Group I, II and III. This standard supplements and modifies the general    
requirements of IEC 60079-0, as shown in Table 1 in the Scope of the document.                                                          
Keywords: mechanical explosion protected equipment

Explosionsfähige Atmosphären - Teil 36: Nicht-elektrische Geräte für den Einsatz in explosionsfähigen Atmosphären - Grundlagen und Anforderungen (ISO 80079-36:2016)

Diese Norm legt die Grundlagen und Anforderungen an Konstruktion, Bau, Prüfung und Kennzeichnung von nichtelektrischen Geräten und Ex Komponenten fest, die für explosionsfähige Atmosphären vorgesehen sind. Diese Norm ist auch für die Konstruktion, den Bau, Prüfung und Kennzeichnung von Komponenten, Schutzsystemen, Geräten und Baugruppen dieser Produkte anwendbar, die eigene potenzielle Zündquellen besitzen und für explosionsfähige Atmosphären vorgesehen sind.
Die Norm legt keine Anforderungen an die Sicherheit fest, ausgenommen jene, die in direktem Zusammen-hang mit dem Explosionsrisiko stehen.
Die normalen atmosphärischen Bedingungen (im Hinblick auf die Explosionseigenschaften der Atmosphäre), unter denen davon auszugehen ist, dass das Gerät betrieben werden kann, sind:
-   Temperatur 20 °C bis +60 °C;
-   Druck 80 kPa (0,8 bar) bis 110 kPa (1,1 bar);
-   und Luft mit normalem Sauerstoffgehalt, gewöhnlich 21 % (Volumenanteil).
ANMERKUNG 1   Derartige Atmosphären können auch im Innern des Gerätes vorhanden sein. Zudem kann die externe Atmosphäre durch natürlichen Austausch als Folge von Schwankungen des Betriebsinnendrucks und/oder der Tempe¬ratur in das Innere des Gerätes gezogen werden.
ANMERKUNG 2   Obwohl die oben aufgeführten normalen atmosphärischen Bedingungen einen Temperaturbereich für die Atmosphäre von 20 °C bis +60 °C angeben, ist der normale Umgebungstemperaturbereich für das Gerät 20 ° bis +40 °C, sofern es nicht anders festgelegt und gekennzeichnet ist. Angenommen wird, dass 20 ° bis +40 °C für die meisten Geräte angemessen ist und dass die Fertigung aller Geräte unnötige Konstruktionsbeschränkungen auferlegen würde, um sie für die Anwendung in einer normalen Atmosphäre im oberen Temperaturbereich von +60 °C geeignet zu machen.
ANMERKUNG 3   Die Anforderungen der vorliegenden Norm können auch bei Konstruktion, Bau, Prüfung und Kennzeich¬nung von Geräten von Nutzen sein, die für den Einsatz in Atmosphären bestimmt sind, die nicht in den oben festgelegten Gültigkeitsbereich dieser Norm fallen. Jedoch sollten in diesem Fall die Zündgefahrenbewertung, die vorgesehene Zünd¬schutzart, zusätzliche Prüfungen (falls erforderlich), die technische Dokumentation des Herstellers und die Betriebs¬anleitung für den Anwender die Eignung der Geräte für die möglichen Einsatzbedingungen eindeutig darstellen und nachweisen. Auch sollte unbedingt bedacht werden, dass Temperatur  und Druckänderungen einen wesentlichen Einfluss auf die Zündfähigkeit haben können.
Sie legt die Anforderungen an die Konstruktion und den Bau von Geräten fest, die für explosionsgefährdete Bereiche in Übereinstimmung mit allen EPL der Gruppen I, II und III vorgesehen sind. Diese Norm kann durch Normen ergänzt werden, die die spezifischen Zündschutzarten betreffen.
ANMERKUNG 4   Nach dieser Norm für ein bestimmtes EPL konstruierte und gebaute Geräte können in Bereichen eingesetzt werden, die ein EPL mit höherem Sicherheitsniveau durch die Anwendung von zusätzlichen Explosionsschutz¬maßnahmen und/oder  verfahren erfordern. Derartige Anwendungen werden in der vorliegenden Norm nicht behandelt. Zu derartigen Explosionsschutzmaßnahmen und/oder  verfahren zählen beispielsweise Inertisierung, Explosionsunter¬drückung, Explosionsdruckentlastung oder explosionsfeste Bauweise oder z. B. Konzentrationsverringerung durch Verdünnen, Absaugung, Überwachung und Abschaltung. Derartige Explosionsschutzverfahren liegen außerhalb des Anwendungsbereichs dieser Norm.
Diese Norm ergänzt und modifiziert die allgemeinen Anforderungen von IEC 60079-0 bis auf die in Tabelle 1 angegebenen. Steht eine Anforderung der vorliegenden Norm im Widerspruch zu einer Anforderung von IEC 60079-0, hat die Anforderung der vorliegenden Norm Vorrang, soweit sie auf ein nichtelektrisches Gerät zutrifft.

Atmosphères explosives - Partie 36: Appareils non électriques destinés à être utilisés en atmosphères explosives - Méthodologie et exigences (ISO 80079-36:2016)

L'ISO 80079-36:2016 spécifie la méthodologie et les exigences de base pour la conception, la construction, les essais et le marquage des appareils Ex non électriques, des composants Ex, des systèmes de protection, des dispositifs et des assemblages de ces produits qui comportent leurs propres sources potentielles d'inflammation et qui sont destinés à être utilisés en atmosphères explosives. Les outils à main et les appareils à fonctionnement manuel sans stockage d'énergie sont exclus du domaine d'application de la présente norme. La présente norme ne traite pas de la sécurité des appareils de procédés autonomes statiques s'ils ne font pas partie des appareils auxquels la présente norme fait référence. La présente norme ne spécifie pas les exigences de sécurité autres que les exigences directement liées au risque d'inflammation pouvant entraîner une explosion. Les conditions atmosphériques normalisées (relatives aux caractéristiques d'explosion de l'atmosphère), selon lesquelles il peut être assumé que les appareils peuvent fonctionner sont les suivantes:
- température de - 20 °C à 60 °C;
- pression de 80 kPa (0,8 bar) à 110 kPa (1,1 bar); et
- air avec teneur normale en oxygène, typiquement de 21 % v/v. De telles atmosphères peuvent également exister à l'intérieur de l'appareil. En outre, l'atmosphère externe peut être aspirée à    
l'intérieur de l'appareil par la respiration naturelle produite en raison des variations de pression de fonctionnement interne de l'appareil et/ou de la température. La présente partie de l'ISO/IEC
80079 définit les exigences relatives à la conception et à la construction des appareils destinés à être utilisés en atmosphères explosives en conformité avec tous les niveaux de protection de    
l'appareil (EPL) des Groupes I, II et III. Cette norme complète et modifie les exigences générales de l'IEC 60079-0 comme indiqué dans le Tableau 1 dans l'avant-propos du document.              
Mots clés: appareils mécaniques protégés contre l'explosion

Eksplozivne atmosfere - 36. del: Neelektrična oprema za potencialno eksplozivne atmosfere - Osnovne metode in zahteve (ISO 80079-36:2016)

Ta mednarodni standard določa osnovno metodo in zahteve za načrtovanje, konstrukcijo, preskušanje in označevanje neelektrične opreme, ki je namenjena za uporabo v eksplozivnih atmosferah plinov, hlapov, meglic in prahu v zraku. Takšne atmosfere lahko obstajajo tudi znotraj opreme. Poleg tega lahko zunanja atmosfera prodira v opremo prek naravnega dihanja, ki nastane kot posledica nihanja notranjega delovnega tlaka opreme in/ali temperature.

General Information

• Status: Published
• Publication Date: 05-Apr-2016
• Withdrawal Date: 29-Oct-2019
• ICS: 13.230 - Explosion protection
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: CEN/TC 305 - Potentially explosive atmospheres - Explosion prevention and protection
• Drafting Committee: CEN/TC 305/WG 2 - Equipment for use in potentially explosive atmospheres (provisional title)
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 06-Apr-2016
• Completion Date: 06-Apr-2016
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Directive: 94/9/EC - 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
• Mandate: M/BC/CEN/92/46 - Standardization mandate assigned to CEN/CENELEC concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: SIST EN ISO 80079-36:2016 - Explosive atmospheres - Part 36: Non-electrical equipment for use in explosive atmospheres - Basic methods and requirements (ISO 80079-36:2016)

Relations

• Replaces: EN 13463-1:2009 - Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements
• Effective Date: 01-May-2010
• Corrected By: EN ISO 80079-36:2016/AC:2019 - Explosive atmospheres - Part 36: Non-electrical equipment for explosive atmospheres - Basic method and requirements - Technical Corrigendum 1 (ISO 80079-36:2016/Cor 1:2019)
• Effective Date: 04-Dec-2019

Overview

EN ISO 80079-36:2016 (ISO 80079-36:2016) defines basic methods and requirements for non‑electrical equipment intended for use in explosive atmospheres. It covers design, construction, testing and marking of non‑electrical Ex equipment, Ex Components, protective systems, devices and assemblies that have their own potential ignition sources. The standard applies across all Equipment Protection Levels (EPLs) for Groups I, II and III and supplements/clarifies general requirements in IEC/EN 60079‑0. It does not apply to hand tools or manually operated equipment without energy storage, nor to static autonomous process equipment when separate from covered equipment.

Standard atmospheric assumptions:

• Temperature: -20 °C to 60 °C
• Pressure: 80 kPa to 110 kPa
• Air: normal oxygen content (≈21% v/v)

Key topics and technical requirements

The standard focuses on ignition‑risk control and includes:

• Ignition hazard assessment - formal identification, documentation and reporting of potential ignition sources and required control measures.
• EPL and equipment groups - requirements for Group I (mining), Group II (surface gas atmospheres) and Group III (combustible dust) equipment.
• Hot surfaces - methods to establish maximum surface temperatures and limit external hot‑spot risks.
• Flames, hot gases and hot particles - evaluation and mitigation for internal/external flame hazards.
• Mechanically generated sparks and frictional heating - assessment procedures for impacts, friction and light‑metal parts.
• Marking and instructions - manufacturer obligations for markings, safe‑use instructions and maintenance requirements to preserve explosion protection.
• Testing and construction - design and verification methods to demonstrate compliance with ignition‑risk requirements.

The standard also provides normative/informative annexes and aligns with the ATEX framework (EU Directive 2014/34/EU) for presumption of conformity where applicable.

Practical applications and users

SIST EN ISO 80079‑36 is essential for:

• Manufacturers and designers of non‑electrical Ex equipment (valves, mechanical actuators, housings, seals, couplings, pressure vessels).
• Certification bodies and conformity assessors applying EPL/ATEX/IECEx criteria.
• Plant safety and maintenance engineers in oil & gas, petrochemical, chemical, mining, grain handling, and pharmaceutical industries.
• Compliance officers preparing technical documentation, instructions and markings for market access in Europe and internationally.

Using this standard helps reduce ignition risks, supports conformity assessments, and ensures equipment is correctly classified and marked for safe use in explosive atmospheres.

Related standards

• IEC/EN 60079‑0 (general requirements for explosive atmospheres)
• EN ISO 80079 series (other parts covering electrical and constructional protection methods)
• EN 13463‑1:2009 (superseded by ISO 80079‑36:2016)

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2016
1DGRPHãþD
SIST EN 13463-1:2009
(NVSOR]LYQHDWPRVIHUHGHO1HHOHNWULþQDRSUHPD]DSRWHQFLDOQRHNVSOR]LYQH
DWPRVIHUH2VQRYQHPHWRGHLQ]DKWHYH,62
Explosive atmospheres - Part 36: Non-electrical equipment for use in explosive
atmospheres - Basic methods and requirements (ISO 80079-36:2016)
Explosionsfähige Atmosphären - Teil 36: Nichtelektrische Geräte für den Einsatz in
explosionsfähigen Atmosphären - Grundlagen und Anforderungen (ISO 80079-36:2016)
Atmosphères explosives - Partie 36: Matériels non électriques destinés à être utilisés en
atmosphères explosives - Méthodologie et exigences (ISO 80079-36:2016)
Ta slovenski standard je istoveten z: EN ISO 80079-36:2016
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
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.

EN ISO 80079-36
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2016
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 13463-1:2009
English Version
Explosive atmospheres - Part 36: Non-electrical equipment
for explosive atmospheres - Basic method and
requirements (ISO 80079-36:2016)
Atmosphères explosives - Partie 36: Appareils non Explosionsfähige Atmosphären - Teil 36: Nicht-
électriques destinés à être utilisés en atmosphères elektrische Geräte für den Einsatz in explosionsfähigen
explosives - Méthodologie et exigences (ISO 80079- Atmosphären - Grundlagen und Anforderungen (ISO
36:2016) 80079-36:2016)
This European Standard was approved by CEN on 18 February 2016.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 80079-36:2016 E
worldwide for CEN national Members.

EN ISO 80079-36.2016 (E)
Contents Page
European Foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/34/EU . 4
Annex ZB (informative) Correspondence of equipment groups . 6
Annex ZC (informative) Significant changes between this European Standard and EN 13463-
1:2009 . 7

EN ISO 80079-36.2016 (E)
European Foreword
This document (EN ISO 80079-36:2016) has been prepared by Technical Committee ISO/TMBG
"Technical Management Board - groups" in collaboration with Technical Committee CEN/TC 305
“Potentially explosive atmospheres - Explosion prevention and protection” the secretariat of which is
held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2016, and conflicting national standards shall
be withdrawn at the latest by October 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
The significant changes with respect to EN 13463-1:2009 are included in Annex ZB “Significant changes
between this European Standard and EN 13463-1:2009".
This document supersedes EN 13463-1:2009.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of 2014/34/EU.
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
Extensions to the marking scheme described in the Directive are found in the ATEX Guidelines
published by the European Commission. These are particularly useful for equipment that conforms to
more than one category.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 80079-36:2016 has been approved by CEN as EN ISO 80079-36:2016 without any
modification.
EN ISO 80079-36.2016 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/34/EU
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association to provide a means of conforming to Essential
Requirements of the New Approach Directive 2014/34/EU.
Once this standard is cited in the Official Journal of the European Union under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the clauses of
this standard given in Table ZA.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 ZA.1 — Correspondence between this European Standard and Directive 2014/34/EU
Clauses/sub- Essential Requirements (ERs) of Qualifying remarks/Notes
clauses of this EN EU Directive 2014/34/EU
4 1.0.1
1.0.2
5.1 1.0.1
1.0.2
1.0.3
5.2 1.0.2
1.3
6.1 1.3
6.2.1, 6.2.2, 6.2.3 1.2.8
1.3.1
1.4.1
6.2.4 2.0.1
2.0.2
6.2.5, 6.2.6 2.1.1
2.2.1
2.3.1
6.2.7 2.1.2
2.2.2
2.3.2
6.3 1.3.1 reference to EN 1127-1
EN ISO 80079-36.2016 (E)
Table ZA.1 (continued)
Clauses/sub- Essential Requirements (ERs) of Qualifying remarks/Notes
clauses of this EN EU Directive 2014/34/EU
6.4 1.3.4
6.5 1.0.1 reference to EN 60079 series
1.3.1
6.6 1.3.3
6.7 1.3.2
6.8 - 6.9 1.3.1
7.1, 7.2 1.3.4
7.3 1.2.6
7.4 1.1.3
1.4.1
1.4.2
7.5 1.2.2
1.2.6
7.6 1.1.3
1.4.2
7.7 1.1.3
1.4.1
1.4.2
8 1.1.3
1.2.1
1.2.2
1.2.5
9.1 1.0.1
1.0.3
1.0.4
9.5 1.0.6
10 1.0.5
Annexes A - G 1.0.2
1.3.1
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.
EN ISO 80079-36.2016 (E)
Annex ZB
(informative)
Correspondence of equipment groups
In all cases Equipment Protection Levels (EPL) as defined by EN 60079-0 are related to the
corresponding Equipment Groups and Equipment Categories according to the following table. The same
applies if a standard makes reference to the intended use of equipment in Zones according to the
definitions in EN 60079-10.
Table ZB.1 — Correspondence of equipment groups
EN 60079-0 Directive 2014/34/EU EN 60079-10-1 and
EN 60079-10-2
EPL Group Equipment Equipment Zones
Group Category
Ma I I M1 NA
Mb M2
Ga II II 1G 0
Gb 2G 1
Gc 3G 2
Da III 1D 20
Db 2D 21
Dc 3D 22
Instructions
The manufacturer or his authorized representative in the Community is to draw up the instructions for
use in the required Community languages.
Marking
The marking according to this standard is to be supplemented by the marking according to Directive
2014/34/EU. Examples are given below.
European marking examples
Directive part Standard part Equipment example
Ex h I Mb Non-electrical equipment for Mining Industry,
I M2
Ex h IIB T4 Gb Non-electrical equipment intended to be used in
II 2 G
Surface Industry classified as Gas Explosive
Atmosphere - Zone1
Ex h IIIC 120°C Da Non-electrical equipment intended to be used in
II 1 D
Surface Industry classified as Explosive
Atmosphere of Combustible Dust - Zone 20
EN ISO 80079-36.2016 (E)
Annex ZC
(informative)
Significant changes between this European Standard and
EN 13463-1:2009
This European Standard supersedes EN 13463-1:2009
Table ZC.1 — Significant changes between this European Standard and EN 13463-1:2009
Modifications significatives Clause Minor and Extensions Extensions
formal
changes
Introduction of new definitions and slight Clause 3 X
redefinitions concerning ignition sources to improve

ignition hazard assessment
Introduction of Equipment Protection Level instead Clause  X
of Category relating to ATEX Directive 4.1

Introduction of Dust groups defined as Group IIIA, Clause  X
IIIB, & IIIC 4.4
Introduction in the instructions for safe use and Clause  X
required maintenance for the equipment shall be 5.1
specified by the manufacturer
Change of wording regarding the formal Ignition Clause X
hazard identification and assessment 5.2.1

Introduction of what the assessment shall show Clause  X
5.2.2.1
Change of wording regarding EPL Mb equipment Clause X
requirment 5.2.2.2
Introduction of a new note regarding the risk of Clause  X
ignition due to other ignition source 6.1

Change of wording regarding the ambient Clause X
temperature 6.2.2
Introduction of a new note regarding the option to Clause  X
calculate maximum temperatures 6.2.3
Introduction of a new note regarding the layers of Clause  X
coal dust 6.2.3
Introduction of a new note regarding the instructions Clause  X
6.2.5
EN ISO 80079-36.2016 (E)
Table ZC.1 (continued)
Modifications significatives Article Minor and Extensions Extensions
formal
changes
Introduction of a new column regarding requirement Clause  X
for T5 classification 6.2.6.1
Introduction of two new notes regarding the Clause  X
enclosed volume 6.2.6.2
Introduction of requirement regarding External hot Clause  X
surfaces 6.2.6.3
NOTE 1 The technical changes referred to include the significant technical changes from the revised EN but this
is not an exhaustive list of all modifications from the previous version.
Explanations:
A) Definitions
Minor and editorial changes clarification
decrease of technical requirements
minor technical change
editorial corrections
Changes in a standard classified as ‘Minor and editorial changes’ refer to changes regarding the
previous standard, which modify requirements in an editorial or a minor technical way. Also changes of
the wording to clarify technical requirements without any technical change are classified as ‘Minor and
editorial changes’.
A reduction in level of existing requirement is also classified as ‘Minor and editorial changes’
Extension addition of technical options

Changes in a standard classified as ‘extension’ refers to changes regarding the previous standard, which
add new or modify existing technical requirements, in a way that new options are given, but without
increasing requirements for equipment that was fully compliant with the previous standard. Therefore
these ‘extensions’ will not have to be considered for products in conformity with the preceding edition.
EN ISO 80079-36.2016 (E)
Major technical changes addition of technical requirements
increase of technical requirements

Changes in a standard classified as ‘Major technical change’ refer to changes regarding the previous
standard, which add new or increase the level of existing technical requirements, in a way that a
product in conformity with the preceding standard will not always be able to fulfil the requirements
given in the standard. ‘Major technical changes’ have to be considered for products in conformity with
the preceding edition. For every change classified as ‘Major Technical Change’ additional information is
provided in clause B) of the Annex ZB.
NOTE 2 These changes represent current technological knowledge . However, these changes should not
normally have an influence on equipment already placed on the market.
B) Information about the background of ‘Major Technical Changes’
None
see also ATEX Guideline 10.3 and Annex ZA
ISO 80079-36
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 36: Non-electrical equipment for explosive atmospheres – Basic method

and requirements
Atmosphères explosives –
Partie 36: Appareils non électriques destinés à être utilisés en atmosphères

explosives – Méthodologie et exigences

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.230; 29.260.20 ISBN 978-2-8322-3202-6

– 2 – ISO 80079-36:2016  ISO 2016
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references. 14
3 Terms and definitions . 15
4 EPL and equipment groups . 18
4.1 EPL . 18
4.2 Group I . 18
4.3 Group II . 18
4.4 Group III . 19
4.5 Equipment for specific explosive gas atmospheres . 19
5 Ignition hazard assessment . 19
5.1 General requirements . 19
5.2 Procedure of ignition hazard assessment . 20
5.2.1 Formal Ignition hazard identification and assessment . 20
5.2.2 Group I equipment assessment . 21
5.2.3 Group II and III equipment assessment . 21
5.2.4 Assessment with malfunctions . 22
5.2.5 Basic information necessary for the ignition hazard assessments . 22
5.2.6 Ignition hazard assessment report . 22
6 Assessment of possible ignition sources and control means . 23
6.1 General . 23
6.2 Hot surfaces . 23
6.2.1 General . 23
6.2.2 Ambient temperatures . 23
6.2.3 Establishing the maximum surface temperature . 23
6.2.4 Group I equipment . 24
6.2.5 Group II equipment . 24
6.2.6 Special cases for Group I and Group II equipment . 25
6.2.7 Group III equipment . 26
6.3 Flames and hot gases (including hot particles) . 26
6.4 Mechanically generated sparks and hot surfaces . 26
6.4.1 General . 26
6.4.2 Assessment of sparks generated by single impacts . 26
6.4.3 Assessment of sparks and hot surfaces generated by friction . 28
6.4.4 External equipment parts containing light metals. 29
6.5 Electrical ignition sources except stray current . 29
6.6 Stray electric currents, cathodic corrosion protection . 29
6.6.1 Internal sources . 29
6.6.2 External sources . 29
6.7 Static electricity. 29
6.7.1 General . 29
6.7.2 Connection facilities for earthing conducting parts . 30
6.7.3 Prevention of highly efficient charge generating mechanisms (leading to
propagating brush discharges on non-conductive layers and coatings) . 30
6.7.4 Equipment group I . 30

ISO 80079-36:2016  ISO 2016 – 3 –
6.7.5 Equipment group II . 31
6.7.6 Equipment group III . 31
6.8 Adiabatic compression and shock waves . 32
6.9 Exothermic reactions, including self-ignition of dusts . 32
7 Additional considerations . 32
7.1 Dust deposits and other material in the gap of moving parts . 32
7.2 Dust deposits and other material in the flame arresters incorporated in the
equipment . 33
7.3 Opening times of enclosures . 33
7.4 Non-metallic enclosures and non-metallic parts of the equipment . 33
7.4.1 General . 33
7.4.2 Specification of the materials . 33
7.4.3 Thermal endurance . 33
7.5 Removable parts . 33
7.6 Materials used for cementing . 33
7.7 Light transmitting parts . 34
7.8 Stored energy . 34
8 Verification and tests . 34
8.1 General . 34
8.2 Determination of the maximum surface temperature . 34
8.2.1 General . 34
8.2.2 Hot Surface Ignition Test . 36
8.3 Mechanical tests . 37
8.3.1 Test for resistance to impact . 37
8.3.2 Drop test . 37
8.3.3 Required results . 37
8.4 Additional tests of non-metallic parts of the equipment relevant for explosion
protection . 37
8.4.1 Test temperatures . 37
8.4.2 Tests for Group I equipment . 37
8.4.3 Tests for Group II and III equipment . 38
8.4.4 Thermal endurance to heat . 38
8.4.5 Thermal endurance to cold . 39
8.4.6 Resistance to chemical substances for Group I equipment . 39
8.4.7 Mechanical resistance tests . 39
8.4.8 Surface resistance test of non-conductive parts of the equipment
relevant for explosion prevention and protection . 39
8.4.9 Thermal shock test . 39
9 Documentation . 39
9.1 Technical documentation . 39
9.2 Conformity with the documentation . 40
9.3 Certificate . 40
9.4 Responsibility for marking . 40
10 Instructions. 40
11 Marking . 41
11.1 Location . 41
11.2 General . 41
11.3 Warning markings . 42
11.4 Marking on very small equipment . 43

– 4 – ISO 80079-36:2016  ISO 2016
11.5 Examples of marking . 43
Annex A (informative) Methodology for confirming the EPL . 44
A.1 Methodology for confirming the EPL of Group I . 44
A.1.1 EPL Ma . 44
A.1.2 EPL Mb . 44
A.2 Methodology for confirming the EPL of Group II and III . 44
A.2.1 EPL Ga and Da . 44
A.2.2 EPL Gb and Db . 44
A.2.3 EPL Gc and Dc . 44
Annex B (informative) Explanation of the ignition hazard assessment procedure . 45
B.1 Overview. 45
B.1.1 General . 45
B.1.2 Reporting with the help of a table . 45
B.2 Assessment Procedure . 45
B.3 Assessment Steps . 46
B.3.1 Identification of Ignition Hazards . 46
B.3.2 Determination of measures . 47
B.3.3 Concluding ignition hazard estimation and categorisation . 48
B.3.4 Determination of the EPL . 48
Annex C (informative) Examples of ignition hazard assessment . 49
C.1 General remarks . 49
C.2 Examples for common cases demonstrating the use of the scheme . 49
C.3 Example of an ignition hazard assessment for a pump . 56
C.4 Example of an ignition hazard assessment for an agitator . 60
Annex D (normative) Charging tests with non-conductive materials . 71
D.1 General . 71
D.2 Principle of the test . 71
D.3 Samples and apparatus . 72
D.4 Procedure . 72
D.4.1 Conditioning . 72
D.4.2 Determination of the most efficient charging method . 72
Annex E (informative) Consideration of misuse which can reasonably be anticipated
during ignition hazard assessment procedure . 76
E.1 General . 76
E.2 Identification and analysis of the ignition hazards . 76
E.3 First assessment of the ignition hazards . 76
E.4 Determination of safety measures . 76
E.5 Final assessment of the ignition hazards . 77
Annex F (informative) Development of different types of incendive electrostatic
discharges . 78
Annex G (normative) Protection concepts of types of protection "d", "p" and "t"
acceptable for non-electrical equipment . 79
Annex H (informative) Volume dependence of auto-ignition temperature . 80
Annex I (informative) Relationship between Equipment protection levels (EPLs) and
zones . 82
Bibliography . 83

Figure 1 – Relationship between ignition source definitions . 20

ISO 80079-36:2016  ISO 2016 – 5 –
Figure D.1 – Rubbing with a pure polyamide cloth . 74
Figure D.2 – Discharging the charged surface of the test piece with a probe connected
to earth via a 0,1 µF capacitor . 74
Figure D.3 – Charging by the influence of a DC high voltage power . 75
Figure F.1 – Different types of incendive electrostatic discharges . 78
Figure H.1 – Volume dependence of auto-ignition temperature . 81

Table 1 – Applicability of specific clauses of IEC 60079-0 . 10
Table 2 – Classification of maximum surface temperatures for Group II equipment . 24
Table 3 – Assessment for temperature classification for small surface areas . 25
Table 4 – Single impact energy limits for EPL Ga . 28
Table 5 – Single impact energy limits for EPL Gb . 28
Table 6 – Single impact energy limits for EPL Gc . 28
Table 7 – Single impact energy limits for EPL Da, Db and Dc . 28
Table 8 – Permitted maximum projected areas for non-conductive parts of equipment
liable to become electrostatically charged . 31
Table 9 – Thermal endurance test . 38
Table 10 – Ambient temperature marking . 42
Table 11 – Text of warning markings . 42
Table B.1 –Table showing recommended documentation of an example of initial
assessment of equipment related ignition sources . 46
Table B.2 – Example for reporting of the identification of ignition hazards (step 1) and
the first assessment (step 2) . 47
Table B.3 – Example for reporting of the determination of protective measures (step 3)
and the concluding estimation and categorisation (step 4) . 48
Table C.1 – List of examples . 49
Table C.2 – Common cases demonstrating the use of the scheme – Electrostatic
discharge . 50
Table C.3 – Common cases demonstrating the use of the scheme – Hot surface . 52
Table C.4 – Common cases demonstrating the use of the scheme – Mechanical spark . 54
Table C.5 – Ignition hazard assessment report for a pump . 57
Table C.6 – Ignition hazard assessment report for an agitator . 61
Table H.1 – AITs of combustibles taken from IEC 60079-20-1 as contained in Figure H.1. . 80
Table I.1 – Relationship between Equipment protection levels (EPLs) and zones . 82

– 6 – ISO 80079-36:2016  ISO 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 36: Non-electrical equipment for explosive atmospheres –
Basic method and requirements
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.
International Standard ISO 80079-36 has been prepared by IEC sub-committee 31M: Non-
electrical equipment and protective systems for explosive atmospheres, of IEC 31: Equipment
for explosive atmospheres.
The text of this standard is based on the following documents of the IEC:
FDIS Report on voting
31M/103/FDIS 31M/109/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table. In ISO, the standard has been approved by 15 P members
out of 22 having cast a vote.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

ISO 80079-36:2016  ISO 2016 – 7 –
"A list of all parts in the IEC 60079 series, under the general title Explosive atmospheres, as
well as the International Standard 80079 series, 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 web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 8 – ISO 80079-36:2016  ISO 2016
INTRODUCTION
This part of ISO/IEC 80079 addresses for the first time basic requirements and protection
concepts for mechanical explosion protected equipment on an international level. Up to now,
with some exceptions, only the design, manufacture, installation and operation of electrical
equipment in explosive atmospheres have been addressed in ISO and IEC standards.
Examples of non-electrical equipment are: couplings, pumps, gearboxes, brakes, hydraulic
and pneumatic motors and any combination of devices to realise a machine, fan, engine,
compressor, assemblies, etc.
Although many but not all of such machines use an explosion protected electric motor for
motive power the measures needed to reduce the risk of ignition in mechanical equipment as
part of the machine may be different to those applied to electrical equipment.
Whereas electrical equipment working within design parameters often contains effective
ignition sources such as sparking parts, this is not necessarily true for mechanical equipment
which is designed to operate without break-down between predetermined maintenance
operations.
Generally there are two mechanical ignition scenarios that need to be considered. These are,
ignition resulting from a failure in the machine such as a bearing over-heating or ignition
created by the normal functioning of the machine such as a hot brake surface.
Experience has shown that it is essential to perform a comprehensive ignition hazard
assessment on the complete mechanical equipment to identify all potential ignition sources
and determine if they can become effective ignition sources during the expected lifetime of
the mechanical equipment. Once these ignition risks are understood and documented it is
then possible to assign protective measures, depending on the required Equipment Protection
Level (EPL), to minimise the probability that these ignition sources will become effective.
This standard addresses mechanical equipment and assemblies intended for the generation,
transfer, storage, measurement, control and conversion of energy and/or the processing of
material and which are capable of causing an explosion through their own potential sources of
ignition.
Potential ignition sources are not limited to those created by the equipment but include any
ignition sources created by the operation of the equipment; for example hot surfaces when
pumping hot fluids or electrostatic charging when handling plastics.
If the only source of ignition of an item comes from the external process such items are not
considered to have their own source of ignition, and they are not in the scope of this part of
ISO/IEC 80079.
NOTE Examples are items made from plastics (polymers) like plastic pipes and containers that can become
charged due to an external process (and not by the operation of the equipment), or items that can become hot due
to an external process (like a pipe). These are not considered to be “non-electrical equipment" on their own. If on
the other hand such items are incorporated into non-electrical equipment, and could become an ignition source by
the intended operation of the equipment, they need to be assessed together with the equipment under
consideration (for example a plastic pipe as part of a petrol dispenser could become charged due to the operation
of this dispenser).
ISO 80079-36:2016  ISO 2016 – 9 –
EXPLOSIVE ATMOSPHERES –
Part 36: Non-electrical equipment for explosive atmospheres –
Basic method and requirements
1 Scope
This part of ISO/IEC 80079 specifies the basic method and requirements for design,
construction, testing and marking of non-electrical Ex equipment, Ex Components, protective
systems, devices and assemblies of these products that have their own potential ignition
sources and are intended for use in explosive atmospheres.
Hand tools and manually operated equipment without energy storage are excluded from the
scope of this standard. This standard does not address the safety of static autonomous
process equipment when it is n
...