Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods (ISO/IEC 80079-20-2:2016)

ISO/IEC 80079-20-2:2016 is published as a dual logo standard and describes the test methods for the identification of combustible dust and combustible dust layers in order to permit classification
of areas where such materials exist for the purpose of the proper selection and installation of electrical and mechanical equipment for use in the presence of combustible dust. The standard    
atmospheric conditions for determination of characteristics of combustible dusts 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. The test methods defined do not apply to:
- recognized explosives, propellants (e.g. gunpowder, dynamite), or substances or mixtures of substances which may, under some circumstances, behave in a similar manner or
- dusts of explosives and propellants that do not require atmospheric oxygen for combustion, or to pyrophoric substances. This first edition cancels and replaces the first edition of IEC 61241-2-1 published in 1994, the first edition of IEC 61241-2-2 published in 1993 and the first edition of IEC 61241-2-3 published in 1994, combining the requirements into a single document, and is considered to constitute a technical revision. Significant changes with respect to IEC 61241-2-1:1994, IEC 61241-2-2:1993 and IEC 61241-2-3:1994 can be found in the foreword of the document.      
Keywords: combustible dust

Explosionsfähige Atmosphären - Teil 20-2: Werkstoffeigenschaften - Prüfverfahren für brennbare Stäube (ISO/IEC 80079-20-2:2016)

Dieser Teil von ISO/IEC 80079 beschreibt die Prüfverfahren für die Identifizierung von brennbarem Staub und Ablagerungen brennbarer Stäube, um die Klassifizierung von Bereichen, in denen solche Stoffe vorkommen, zum Zweck der Auswahl und Montage von elektrischen und mechanischen Ausrüstungen, die für die Verwendung in Gegenwart von brennbarem Staub geeignet sind, zu ermöglichen.
Die atmosphärischen Normzustände zur Bestimmung der Eigenschaften von brennbaren Stäuben sind
—   Temperatur −20 °C bis +60 °C,
—   Druck 80 kPa (0,8 bar) bis 110 kPa (1,1 bar) und
—   Luft mit normalem Sauerstoffgehalt, typischerweise 21 % v/v.
Die definierten Prüfverfahren sind nicht anwendbar auf
—   anerkannte Sprengstoffe, Treibstoffe (z. B. Schießpulver, Dynamit) oder auf Stoffe und Stoffgemische, die sich unter Umständen ähnlich verhalten können oder
—   Stäube von Sprengstoffen und Treibstoffen, die keinen atmosphärischen Sauerstoff zur Verbrennung benötigen oder auf pyrophore Stoffe.

Atmosphères explosives - Partie 20-2: Caractéristiques des produits - Méthodes d’essai des poussières combustibles (ISO/IEC 80079-20-2:2016)

Eksplozivne atmosfere - 20-2. del: Lastnosti materiala - Metode preskušanja gorljivega prahu (ISO/IEC 80079-20-2:2016)

Ta standard opisuje preskusne metode za ugotavljanje, ali so za material značilne lastnosti, ki se upoštevajo kot gorljiv prah, in za ugotavljanje lastnosti gorljivih prahov. Ta preskusna metoda se uporablja za določanje in razvrščanje območij, v katerih so prisotne eksplozivne prašne atmosfere in gorljive plasti prahu, da se omogoči ustrezna ocena potencialnih virov vžiga opreme, ki jih je treba uporabljati pri konstrukciji in uporabi opreme, ki se uporablja v prisotnosti gorljivega prahu. Opredeljene preskusne metode se ne uporabljajo za: – znane eksplozive, smodnik, dinamit ali snovi ali mešanice snovi, ki lahko v nekaterih okoliščinah delujejo podobno; ali – prah eksplozivov, ki za gorenje ne potrebuje atmosferskega kisika, ali piroforne snovi.

General Information

Status
Published
Publication Date
29-Mar-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
30-Mar-2016
Completion Date
30-Mar-2016

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SLOVENSKI STANDARD
SIST EN ISO/IEC 80079-20-2:2016
01-julij-2016
1DGRPHãþD
SIST EN 13821:2003
Eksplozivne atmosfere - 20-2. del: Lastnosti materiala - Metode preskušanja
gorljivega prahu (ISO/IEC 80079-20-2:2016)

Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test

methods (ISO/IEC 80079-20-2:2016)

Explosionsfähige Atmosphären - Teil 20-2: Werkstoffeigenschaften - Prüfverfahren für

brennbare Stäube (ISO/IEC 80079-20-2:2016)

Atmosphères explosives - Partie 20-2: Caractéristiques des produits - Méthodes d'essai

des poussières combustibles (ISO/IEC 80079-20-2:2016)
Ta slovenski standard je istoveten z: EN ISO/IEC 80079-20-2:2016
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
13.230 Varstvo pred eksplozijo Explosion protection
SIST EN ISO/IEC 80079-20-2:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO/IEC 80079-20-2:2016
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 61241-2-2:1995
English Version
Explosive atmospheres - Part 20-2: Material
characteristics - Combustible dusts test methods (ISO/IEC
80079-20-2:2016)

Atmosphères explosives - Partie 20-2: Caractéristiques Explosionsfähige Atmosphären - Teil 20-2:

des produits - Méthodes d'essai des poussières Werkstoffeigenschaften - Prüfverfahren für brennbare

combustibles (ISO/IEC 80079-20-2:2016) Stäube (ISO/IEC 80079-20-2:2016)
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/IEC 80079-20-2:2016 E

worldwide for CEN national Members.
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (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) Significant changes with respect to IEC 61241-2-1:1994, EN 61241-

2-2:1993 and IEC 61241-2-3:1994 ............................................................................................................ 5

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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
European foreword

This document (EN ISO/IEC 80079-20-2:2016) 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 September 2016, and conflicting national standards

shall be withdrawn at the latest by September 2016.

The significant changes with respect to EN 61241-2:1995 are included in Annex ZB “Significant changes

with respect to IEC 61241-2-1:1994, IEC 61241-2-2:1993 and IEC 61241-2-3:1994".
This document supersedes EN 61241-2-2:1995.

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.

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.

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/IEC 80079-20-2:2016 has been approved by CEN as EN ISO/IEC 80079-20-2:2016

without any modification.
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (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 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

Clause(s)/sub-clause(s) of this Essential Requirements (ERs) Qualifying remarks/Notes

EN of Directive 2014/34/EU
5, 6, Annex G Annex II, Clause 1.01; 1.0.6a;
1.0.6b; 1.2.1; 1.2.4; 1.5.7

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling

within the scope of this standard.
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Annex ZB
(informative)
Significant changes with respect to IEC 61241-2-1:1994, EN 61241-2-2:1993
and IEC 61241-2-3:1994

This European Standard supersedes IEC 61241-2-1:1994, EN 61241-2-2:1993 and IEC 61241-2-3:1994

Table ZB.1 — Significant changes with respect to IEC 61241-2-1:1994, EN 61241-2-2:1993 and

IEC 61241-2-3:1994
Type
Explanation of the significance of the Clause Minor and Extension Major
changes editorial technical
changes changes
Normative references 2 X
Terms and Definitions 3 X
Dust sample Requirements 4 X
Combustible Dust Determination 5 X
Procedure for Characterisation of 6 X
combustible dust or combustible flying
Test methods for determination of a 7 X
combustible dust or a combustible flying
MIT of a dust cloud 8.1 X
MIT of a dust layer 8.2 X
MIE of a dust/air mixture 8.3 X
Tests on resistivity 8.4 X
Measurement of temperature Annex X
distribution on the surface of the hot A
plate
Godbert-Greenwald oven Annex X
Examples of spark-generating systems Annex X
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Table ZB.1 (continued)
Type

Explanation of the significance Clause Minor and editorial Extension Major technical

of the changes changes changes
Vertical tube apparatus Annex X
20-litre sphere Annex X
BAM oven Annex X
Data for dust explosion Annex X
characteristics G
1m vessel Annex X

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.

Major technical changes addition of technical requirements
increase of technical requirements
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)

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
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SIST EN ISO/IEC 80079-20-2:2016
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SIST EN ISO/IEC 80079-20-2:2016
ISO/IEC 80079-20-2
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 20-2: Material characteristics – Combustible dusts test methods
Atmosphères explosives –
Partie 20-2: Caractéristiques des produits – Méthodes d’essai des poussières
combustibles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.230; 29.260.20 ISBN 978-2-8322-3179-1

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.

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SIST EN ISO/IEC 80079-20-2:2016
– 2 – ISO/IEC 80079-20-2:2016
 ISO/IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 5

1 Scope ............................................................................................................................ 8

2 Normative references..................................................................................................... 8

3 Terms and definitions .................................................................................................... 8

4 Dust sample requirements ............................................................................................. 9

4.1 Receipt of sample for testing ................................................................................. 9

4.2 Characterisation of sample .................................................................................... 9

4.3 Preparation of sample ......................................................................................... 10

4.4 Test conditions .................................................................................................... 10

5 Combustible dusts and combustible flyings determination ............................................. 10

5.1 Test sequence .................................................................................................... 10

5.2 Tests to determine whether material is a combustible dust or combustible

flying ................................................................................................................... 10

5.2.1 Visual inspection .......................................................................................... 10

5.2.2 Determine particle distribution ...................................................................... 11

5.2.3 Ignition test in the Hartmann tube ................................................................. 11

5.2.4 Ignition test in the 20-litre sphere ................................................................. 11

6 Procedure for characterisation of combustible dust or combustible flying ...................... 11

7 Test methods for determination of whether a material is a combustible dust or a

combustible flying ........................................................................................................ 14

7.1 Modified Hartmann tube ...................................................................................... 14

7.1.1 General ....................................................................................................... 14

7.1.2 Test equipment ............................................................................................ 14

7.1.3 Test procedure ............................................................................................. 15

7.2 20-litre sphere ..................................................................................................... 15

7.2.1 General ....................................................................................................... 15

7.2.2 Test equipment ............................................................................................ 15

7.2.3 Test procedure ............................................................................................. 16

7.3 Alternative method to 20-litre sphere for small test material quantities .................. 16

7.3.1 General ....................................................................................................... 16

7.3.2 Test equipment ............................................................................................ 17

7.3.3 Test procedure ............................................................................................. 17

8 Test methods for combustible dust determinations ....................................................... 17

8.1 MIT of a dust cloud ............................................................................................. 17

8.1.1 General ....................................................................................................... 17

8.1.2 GG furnace .................................................................................................. 17

8.1.3 BAM furnace ................................................................................................ 18

8.2 Test for MIT of dust layer .................................................................................... 19

8.2.1 General ....................................................................................................... 19

8.2.2 Heated surface ............................................................................................ 19

8.2.3 Dust layers .................................................................................................. 20

8.2.4 Dust layer temperature ................................................................................. 20

8.2.5 Ambient temperature measurements ............................................................ 20

8.2.6 Dust layer temperature test method .............................................................. 20

8.2.7 Recording of results ..................................................................................... 21

8.3 Method for determining minimum ignition energy of dust/air mixtures ................... 22

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SIST EN ISO/IEC 80079-20-2:2016
ISO/IEC 80079-20-2:2016 – 3 –
 ISO/IEC 2016

8.3.1 General ....................................................................................................... 22

8.3.2 Test equipment ............................................................................................ 22

8.3.3 Test procedure ............................................................................................. 23

8.3.4 Calibration for determination of minimum ignition energies (MIE) by

electrically generated high-voltage d.c. sparks .............................................. 24

8.3.5 Recording of test results .............................................................................. 24

8.4 Test on resistivity ................................................................................................ 24

8.4.1 General ....................................................................................................... 24

8.4.2 Test equipment ............................................................................................ 25

8.4.3 Test procedure ............................................................................................. 25

8.4.4 Recording of test results .............................................................................. 26

9 Test report................................................................................................................... 26

Annex A (normative) Measurement of temperature distribution on the surface of the

hot plate ............................................................................................................................. 27

Annex B (informative) Godbert-Greenwald oven (GG) ......................................................... 28

Annex C (informative) Examples of spark-generating systems ............................................ 29

C.1 General ............................................................................................................... 29

C.2 Triggering by auxiliary spark using three-electrode system ................................... 30

C.3 Triggering by electrode movement ....................................................................... 31

C.4 Triggering by voltage increase (trickle-charging circuit) ........................................ 32

C.5 Triggering by auxiliary spark, using normal two-electrode system – Trigger

transformer in discharge circuit ............................................................................ 33

Annex D (normative) Vertical tube (modified Hartmann tube) apparatus .............................. 34

Annex E (informative) 20-litre sphere ................................................................................. 35

Annex F (informative) BAM oven ........................................................................................ 37

Annex G (informative) Data for dust explosion characteristics ............................................. 38

Annex H (informative) 1 m vessel ..................................................................................... 39

H.1 Test principle ...................................................................................................... 39

H.2 Test apparatus .................................................................................................... 39

H.3 Test conditions .................................................................................................... 43

H.4 Test procedure .................................................................................................... 43

Bibliography ....................................................................................................................... 45

Figure 1 – Protocol for characterisation of combustible dust or combustible flying ................ 12

Figure 2 – Tests to define ability to form explosive dust atmosphere (combustible

dust/combustible flyings) ..................................................................................................... 13

Figure 3 – Tests to characterise combustible dust or combustible flying ............................... 14

Figure 4 – Modified Hartmann tube ..................................................................................... 23

Figure 5 – Measuring cell for powder resistivity ................................................................... 25

Figure A.1 – Typical surface temperature distribution (method A) ......................................... 27

Figure B.1 – Vertical cross-section through the Godbert-Greenwald oven ............................. 28

Figure C.1 – Circuit – Triggering by high-voltage relay, using a two-electrode system .......... 29

Figure C.2 – Apparatus for determining the minimum ignition energies of dust

(schematic) – Triggering by auxiliary spark using three-electrode system ............................. 30

Figure C.3 – Apparatus for determining the minimum ignition energies of dust

(schematic) – Triggering by electrode movement ................................................................. 31

Figure C.4 – Apparatus for determining the minimum ignition energies of dust

(schematic) – Triggering by voltage increase ....................................................................... 32

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SIST EN ISO/IEC 80079-20-2:2016
– 4 – ISO/IEC 80079-20-2:2016
 ISO/IEC 2016
Figure C.5 – Apparatus for determining the minimum ignition energies for dust

(schematic) – Trigger transformer in discharge circuit .......................................................... 33

Figure D.1 – Vertical tube apparatus (modified Hartmann tube) ........................................... 34

Figure E.1 – Test equipment 20-litre sphere (schematic) ...................................................... 35

Figure E.2 – Cross-sectional view of rebound nozzle ........................................................... 36

Figure E.3 – Plan view of rebound nozzle ............................................................................ 36

Figure E.4 – Cross-sectional view of dispersion cup ............................................................ 36

Figure F.1 – Cross-sectional arrangement of BAM oven ....................................................... 37

Figure H.1 – 1 m vessel (schematic) .................................................................................. 40

Figure H.2 – Location of the 6 mm holes in the semicircular dust dispenser ......................... 41

Figure H.3 – Rebound nozzle .............................................................................................. 42

Figure H.4 – Dispersion cup ................................................................................................ 43

Table 1 – Example of ignition test report ............................................................................. 21

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SIST EN ISO/IEC 80079-20-2:2016
ISO/IEC 80079-20-2:2016 – 5 –
 ISO/IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 20-2: Material characteristics –
Combustible dusts test methods
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/IEC 80079-20-2 has been prepared by subcommittee 31M: Non-

electrical equipment and protective systems for explosive atmospheres, of IEC 31: Equipment

for explosive atmospheres.
It is published as a double logo standard.

This first edition cancels and replaces the first edition of IEC 61241-2-1 published in 1994, the

first edition of IEC 61241-2-2 published in 1993 and the first edition of IEC 61241-2-3

published in 1994, combining the requirements into a single document, and is considered to

constitute a technical revision.
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SIST EN ISO/IEC 80079-20-2:2016
– 6 – ISO/IEC 80079-20-2:2016
 ISO/IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
31M/102/FDIS 31M/108/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 21 having cast a vote.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

"A list of all parts in the IEC 60079 series, under the general title Explosive atmospheres, as

well as the Interna
...

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