EN ISO/IEC 80079-20-2:2016

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
• Withdrawal Date: 29-Sep-2016
• 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 1 - Test methods for determining the flammability characteristics of substances (provisional title)
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 30-Mar-2016
• Due Date: 26-Feb-2017
• Completion Date: 30-Mar-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
• Ref Project: SIST EN ISO/IEC 80079-20-2:2016 - Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods (ISO/IEC 80079-20-2:2016)

Relations

• Replaces: EN 13821:2002 - Potentially explosive atmospheres - Explosion prevention and protection - Determination of minimum ignition energy of dust/air mixtures
• Effective Date: 13-Sep-2017
• Corrected By: EN ISO/IEC 80079-20-2:2016/AC:2017 - Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods - Technical Corrigendum 1 (ISO/IEC 80079-20-2:2016/Cor 1:2017)
• Effective Date: 22-Mar-2017

Standards Content (Sample)

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

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.

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

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.
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.

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
B
Examples of spark-generating systems Annex X
C
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
D
20-litre sphere Annex X
E
BAM oven Annex X
F
Data for dust explosion Annex X
characteristics G
1m vessel Annex X
H
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
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/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

– 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 mater
...