SIST EN 60079-10-2:2015
(Main)Explosive atmospheres -- Part 10-2: Classification of areas - Combustible dust atmospheres (IEC 60079-10-2:2015)
Explosive atmospheres -- Part 10-2: Classification of areas - Combustible dust atmospheres (IEC 60079-10-2:2015)
This part of IEC 60079 is concerned with the identification and classification of areas where
explosive dust atmospheres and combustible dust layers are present, in order to permit the
proper assessment of ignition sources in such areas.
In this standard, explosive dust atmospheres and combustible dust layers are treated
separately. In Clause 4, area classification for explosive dusts clouds is described, with dust
layers acting as one of the possible sources of release. In Clause 7 other general
considerations for dust layers are described.
The examples in this standard are based on a system of effective housekeeping being
implemented in the plant to prevent dust layers from accumulating. Where effective
housekeeping is not present, the area classification includes the possible formation of
explosive dust clouds from dust layers.
The principles of this standard can also be followed when combustible fibres or flyings might
cause a hazard.
This standard is intended to be applied where there can be a risk due to the presence of
explosive dust atmospheres or combustible dust layers under normal atmospheric conditions
(see Note 1).
NOTE 1 Atmospheric conditions include variations in pressure and temperature above and below reference levels
of 101,3 kPa (1 013 mbar) and 20 °C (293 K), provided that the variations have a negligible effect on the explosive
properties of the combustible materials.
It does not apply to
– underground mining areas,
– dusts of explosives that do not require atmospheric oxygen for combustion such as
pyrophoric substances, propellants, pyrotechnics, munitions, peroxides, oxidizers, waterreactive
elements or compounds, or other similar materials.
– catastrophic failures which are beyond the concept of abnormality dealt with in this
standard,
– any risk arising from an emission of toxic gas from the dust.
This standard does not apply to where a hazard might arise due to the presence of flammable
gas or vapour, but the principles may be used in the assessment of a hybrid mixture (see also
IEC 60079-10-1).
NOTE 2 Additional guidance on hybrid mixtures is provided in Annex C.
This standard does not take into account the effects of consequential damage following a fire
or an explosion.
Explosionsgefährdete Bereiche - Teil 10-2: Einteilung der Bereiche - Staubexplosionsgefährdete Bereiche (IEC 60079-10-2:2015)
Atmosphéres explosives - Partie 10-2: Classement des emplacements - Atmosphères explosives poussiéreuses (IEC 60079-10-2:2015)
Eksplozivne atmosfere - 10-2. del: Razvrstitev prostorov - Eksplozivne prašne atmosfere (IEC 60079-10-2:2015)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60079-10-2:2015
01-junij-2015
1DGRPHãþD
SIST EN 60079-10-2:2009
Eksplozivne atmosfere - 10-2. del: Razvrstitev prostorov - Eksplozivne prašne
atmosfere (IEC 60079-10-2:2015)
Explosive atmospheres -- Part 10-2: Classification of areas - Combustible dust
atmospheres (IEC 60079-10-2:2015)
Explosionsgefährdete Bereiche - Teil 10-2: Einteilung der Bereiche -
Staubexplosionsgefährdete Bereiche (IEC 60079-10-2:2015)
Atmosphéres explosives - Partie 10-2: Classement des emplacements - Atmosphères
explosives poussiéreuses (IEC 60079-10-2:2015)
Ta slovenski standard je istoveten z: EN 60079-10-2:2015
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 60079-10-2:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60079-10-2:2015
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SIST EN 60079-10-2:2015
EUROPEAN STANDARD EN 60079-10-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2015
ICS 29.260.20 Supersedes EN 60079-10-2:2009
English Version
Explosive atmospheres - Part 10-2: Classification of areas -
Explosive dust atmospheres
(IEC 60079-10-2:2015)
Atmosphéres explosives - Partie 10-2: Classement des Explosionsgefährdete Bereiche - Teil 10-2: Einteilung der
emplacements - Atmosphères explosives poussiéreuses Bereiche - Staubexplosionsgefährdete Bereiche
(IEC 60079-10-2:2015) (IEC 60079-10-2:2015)
This European Standard was approved by CENELEC on 2015-02-20. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60079-10-2:2015 E
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SIST EN 60079-10-2:2015
EN 60079-10-2:2015 - 2 -
Foreword
The text of document 31J/244/FDIS, future edition 2 of IEC 60079-10-2, prepared by SC 31J "Classification
of hazardous areas and installation requirements" of IEC/TC 31 "Equipment for explosive atmospheres" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60079-10-2:2015.
The following dates are fixed:
(dop) 2015-11-20
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2018-02-20
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60079-10-2:2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60079-10-2:2015 was approved by CENELEC as a European
Standard without any modification.
IEC 60079-2 NOTE Harmonized as EN 60079-2.
IEC 60079-11 NOTE Harmonized as EN 60079-11.
IEC 60079-14 NOTE Harmonized as EN 60079-14.
IEC 60079-28 NOTE Harmonized as EN 60079-28.
IEC 60079-18 NOTE Harmonized as EN 60079-18.
IEC 60079-31 NOTE Harmonized as EN 60079-31.
IEC 60079-32-2 NOTE Harmonized as EN 60079-32-2.
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SIST EN 60079-10-2:2015
- 3 - EN 60079-10-2:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60079-0 (mod) - Explosive atmospheres -- Part 0: Equipment - EN 60079-0 -
General requirements
+A11 2013
IEC 60079-10-1 - Explosive atmospheres -- Part 10-1: EN 60079-10-1 -
Classification of areas - Explosive gas
atmospheres
ISO/IEC 80079-20-2 - Explosive atmospheres - Part 20-2: Material - -
characteristics - Combustible dusts test
methods
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SIST EN 60079-10-2:2015
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SIST EN 60079-10-2:2015
IEC 60079-10-2
®
Edition 2.0 2015-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 10-2: Classification of areas – Explosive dust atmospheres
Atmosphères explosives –
Partie 10-2: Classement des emplacements – Atmosphères explosives
poussiéreuses
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-2195-2
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60079-10-2:2015
– 2 – IEC 60079-10-2:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Area classification . 12
4.1 General . 12
4.2 Area classification procedure for explosive dust atmospheres . 13
4.3 Competence of personnel . 14
5 Sources of release. 14
5.1 General . 14
5.2 Dust containment . 14
5.3 Identification and grading of sources of release . 14
6 Zones . 15
6.1 General . 15
6.2 Extent of zones . 15
6.2.1 General . 15
6.2.2 Zone 20 . 15
6.2.3 Zone 21 . 16
6.2.4 Zone 22 . 16
7 Dust layers . 16
8 Documentation . 17
8.1 General . 17
8.2 Drawings, data sheets and tables . 17
8.2.1 Content of documents . 17
8.2.2 Preferred Symbol key for area classification zones . 18
Annex A (informative) Area classification examples . 19
A.1 Examples of zones . 19
A.1.1 General . 19
A.1.2 Zone 20 . 19
A.1.3 Zone 21 . 19
A.1.4 Zone 22 . 19
A.2 Bag emptying station within a building and without exhaust ventilation . 20
A.3 Bag emptying station with exhaust ventilation . 21
A.4 Cyclone and filter with clean outlet outside building . 21
A.5 Drum tipper within a building without exhaust ventilation . 22
Annex B (informative) Housekeeping . 24
B.1 Introductory remarks . 24
B.2 Levels of housekeeping . 24
Annex C (informative) Hybrid mixtures . 26
C.1 General . 26
C.2 Ventilation. 26
C.3 Explosive limits . 26
C.4 Chemical reactions . 26
C.5 Minimum ignition parameters . 26
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SIST EN 60079-10-2:2015
IEC 60079-10-2:2015 © IEC 2015 – 3 –
C.6 Final classification . 26
Bibliography . 27
Figure 1 – Identification of zones on drawings . 18
Figure A.1 – Bag emptying station within a building and without exhaust ventilation . 20
Figure A.2 – Bag emptying station with exhaust ventilation . 21
Figure A.3 – Cyclone and filter with clean outlet outside building . 22
Figure A.4 – Drum tipper within a building without exhaust ventilation . 23
Table 1 – Designation of zones depending on presence of dust . 16
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SIST EN 60079-10-2:2015
– 4 – IEC 60079-10-2:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 10-2: Classification of areas –
Explosive dust atmospheres
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 IEC 60079-10-2 has been prepared by subcommittee 31J:
Classification of hazardous areas and istallation requirements, of IEC technical committee 31:
Equipment for explosive atmospheres.
This second edition of IEC 60079-10-2 cancels and replaces the first edition of
IEC 60079-10-2 published in 2009. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
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SIST EN 60079-10-2:2015
IEC 60079-10-2:2015 © IEC 2015 – 5 –
Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
Definition of “atmospheric conditions” deleted 3 X
Definition of “combustible dust” aligned with other
3.4 X
documents per recommendations of WG 28
Editorial change to definition of “explosive dust atmosphere”
to delete mention of flyings, since the definition of dust 3.5 X
according to 60079-10-2 includes flyings.
Definition of “combustible flyings” aligned with other
3.8 X
documents per recommendations of WG 28
Definition of “continuous formation of a dust cloud” added 3.14 X
Definition of “catastrophic failure” added 3.20 X
Definition of “ignition temperature of a dust layer” aligned
with other documents per recommendations of WG 28 and 3.22 X
to change reference from 61241-2-1 to 80079-20-2
Definitions of “zone 20, zone 21 and zone 22” added. 3.25.1
These were previously incorrectly included in the body of
3.25.2 X
the document.
3.25.3
Dust cloud density and concentration added as factors to
4.1 X
consider for a release
Wording changed to require EPL to be noted on area
4.1 X
classification drawing
Notes 1 and 3 changed to normative text 4.1 X
Reference to published sources for dust characteristics
4.2 X
deleted
Reference to 80079-20-2 added 4.2 a) X
Section on competence of personnel added 4.3 X
Note on verification dossier deleted 5.2 X
Example added for continuous grade of release, zone
5.3 X
information moved to Clause 6
Paragraph added about dust layers being raised into a
7 X
cloud
EPLs added to list for documentation, note added warning
8.1 X
of variability in published dust data
Symbol keys are identified as preferred 8.2 X
Note added to zone 21 and zone 22 clause about distance
Annex A X
around source of release
Zone 22 paragraph added to this example, and figure
A.2 X
modified to show Zone 22 location
Annex B on hot surfaces deleted Annex B in
previous X
edition
Annex D on explanation of EPLs deleted Annex D in
previous X
edition
Annex on hybrid mixtures added Annex C X
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SIST EN 60079-10-2:2015
– 6 – IEC 60079-10-2:2015 © IEC 2015
Explanation of the types of significant changes:
– Clarification
– Decrease of technical requirements
1. Minor and editorial changes:
– Minor technical change
– Editorial corrections
These are changes which modify requirements in an editorial or a minor technical way. They include changes of
the wording to clarify technical requirements without any technical change, or a reduction in the level of existing
requirement.
2. Extension:
– Addition of technical options
These are changes which add new or modify existing technical requirements, in a way that new options are
given, but without increasing the requirements that are fully compliant with the previous standard. Therefore,
these will not have to be considered for existing area classifications in conformity with the preceding edition.
– Addition of technical requirements
3. Major technical changes:
– Increase of technical requirements
These are changes to technical requirements (addition, increase of the level or removal) made in a way that an
existing area classification in conformity with the preceding edition will not always be able to fulfil the
requirements given in the later edition. These changes have to be considered for existing area classifications in
conformity with the preceding edition.
The text of this standard is based on the following documents:
FDIS Report on voting
31J/244/FDIS 31J/248/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60079 series, under the general title Explosive atmospheres, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60079-10-2:2015
IEC 60079-10-2:2015 © IEC 2015 – 7 –
INTRODUCTION
Dusts, as defined in this standard, are hazardous because when they are dispersed in air by
any means they may form potentially explosive atmospheres. Furthermore, layers of dust may
ignite and act as ignition sources for an explosive atmosphere.
This part of IEC 60079 gives guidance on the identification and classification of areas where
such hazards from dust can arise. It sets out the essential criteria against which the ignition
hazards can be assessed and gives guidance on the design and control parameters which
can be used in order to reduce such a hazard. General and special criteria are given for the
process of identification and classification of hazardous areas.
This standard contains an informative Annex A giving examples for classifying areas.
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SIST EN 60079-10-2:2015
– 8 – IEC 60079-10-2:2015 © IEC 2015
EXPLOSIVE ATMOSPHERES –
Part 10-2: Classification of areas –
Explosive dust atmospheres
1 Scope
This part of IEC 60079 is concerned with the identification and classification of areas where
explosive dust atmospheres and combustible dust layers are present, in order to permit the
proper assessment of ignition sources in such areas.
In this standard, explosive dust atmospheres and combustible dust layers are treated
separately. In Clause 4, area classification for explosive dusts clouds is described, with dust
layers acting as one of the possible sources of release. In Clause 7 other general
considerations for dust layers are described.
The examples in this standard are based on a system of effective housekeeping being
implemented in the plant to prevent dust layers from accumulating. Where effective
housekeeping is not present, the area classification includes the possible formation of
explosive dust clouds from dust layers.
The principles of this standard can also be followed when combustible fibres or flyings might
cause a hazard.
This standard is intended to be applied where there can be a risk due to the presence of
explosive dust atmospheres or combustible dust layers under normal atmospheric conditions
(see Note 1).
NOTE 1 Atmospheric conditions include variations in pressure and temperature above and below reference levels
of 101,3 kPa (1 013 mbar) and 20 °C (293 K), provided that the variations have a negligible effect on the explosive
properties of the combustible materials.
It does not apply to
– underground mining areas,
– dusts of explosives that do not require atmospheric oxygen for combustion such as
pyrophoric substances, propellants, pyrotechnics, munitions, peroxides, oxidizers, water-
reactive elements or compounds, or other similar materials.
– catastrophic failures which are beyond the concept of abnormality dealt with in this
standard,
– any risk arising from an emission of toxic gas from the dust.
This standard does not apply to where a hazard might arise due to the presence of flammable
gas or vapour, but the principles may be used in the assessment of a hybrid mixture (see also
IEC 60079-10-1).
NOTE 2 Additional guidance on hybrid mixtures is provided in Annex C.
This standard does not take into account the effects of consequential damage following a fire
or an explosion.
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SIST EN 60079-10-2:2015
IEC 60079-10-2:2015 © IEC 2015 – 9 –
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-10-1, Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas
atmospheres
ISO/IEC 80079-20-2, Explosive Atmospheres – Part 20-2: Material Characteristics –
1
Combustible dusts test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60079-0 and the
following apply.
NOTE Additional definitions applicable to explosive atmospheres can be found in IEC 60050-426.
3.1
area
three-dimensional region or space
3.2
hybrid mixture
mixture of a flammable gas or vapour with a dust
3.3
dust
generic term including both combustible dust and combustible flyings
3.4
combustible dust
finely divided solid particles, 500 µm or less in nominal size, which may form an explosive
mixture with air at atmospheric pressure and normal temperatures
Note 1 to entry: This includes dust and grit as defined in ISO 4225.
Note 2 to entry: The term solid particles is intended to address particles in the solid phase and not the gaseous or
liquid phase, but does not preclude a hollow particle.
Note 3 to entry: Materials passing a U.S. No. 40 Standard sieve as defined in ASTM E 11-04 are considered to
meet the 500 µm criterion.
Note 4 to entry: Combustible dust test methods can be found in ISO/IEC 80079-20-2.
3.5
explosive dust atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of dust,
which, after ignition, permits self-sustaining propagation
______________
1
To be published.
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SIST EN 60079-10-2:2015
– 10 – IEC 60079-10-2:2015 © IEC 2015
3.6
conductive dust
3
combustible dust with electrical resistivity equal to or less than 10 Ωm
Note 1 to entry: Conductive dust is classified as Group IIIC.
3.7
non-conductive dust
3
combustible dust with electrical resistivity greater than 10 Ωm
Note 1 to entry: Non-conductive dust is classified as Group IIIB.
3.8
combustible flyings
solid particles including fibers, greater than 500 µm in nominal size, which may form an
explosive mixture with air at atmospheric pressure and normal temperatures
Note 1 to entry: Examples of flyings include rayon, cotton (including cotton linters and cotton waste) sisal, jute,
hemp, cocoa fiber, okum and waste kapok.
Note 2 to entry: Combustible flyings are classified as Group IIIA.
3.9
hazardous area (dust)
area in which combustible dust, in the form of a cloud is present, or may be expected to be
present, in quantities such as to require special precautions for the construction, installation
and use of equipment
Note 1 to entry: Hazardous areas are divided into zones based upon the frequency and duration of the occurrence
of explosive dust atmospheres (see 6.2 and 6.3).
Note 2 to entry: The potential of creating an explosive dust cloud from a dust layer also needs to be considered.
3.10
non-hazardous area (dust)
area in which combustible dust in the form of a cloud is not expected to be present in
quantities such as to require special precautions for the construction, installation and use of
equipment
3.11
dust containment
process equipment housing which is intended to handle, process, transport or store materials
inside of it, while minimizing the risk of the release of dust to the surrounding atmosphere
3.12
source of dust release
point or location from which dust may be released into the atmosphere
Note 1 to entry: The source of dust release can be from a dust containment or from a dust layer.
3.13
continuous grade of release
release which is continuous or is expected to occur frequently or for long periods
3.14
continuous formation of a dust cloud
locations in which a dust cloud may exist continuously, or may be expected to continue for
long periods or for short periods which occur frequently
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SIST EN 60079-10-2:2015
IEC 60079
...
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