EN 60079-10:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Electrical apparatus for explosive gas atmospheres - Part 10: Classification of hazardous areas]GHOLWHYMatériel électrique pour atmosphères explosives gazeuses - Partie 10: Classement des emplacements dangereuxElektrische Betriebsmittel für gasexplosionsgefährdete Bereiche - Teil 10: Einteilung der explosionsgefährdeten Bereiche29.260.20Electrical apparatus for explosive atmospheresICS:SIST EN 60079-10:2003en,fr,deTa slovenski standard je istoveten z:EN 60079-10:200301-november-2003SIST EN 60079-10:2003SLOVENSKI
STANDARDSIST EN 60079-10:19971DGRPHãþD

EUROPEAN STANDARD
EN 60079-10 NORME EUROPÉENNE EUROPÄISCHE NORM
April 2003 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-10:2003 E
ICS 29.260.20 Supersedes EN 60079-10:1996
English version
Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areas (IEC 60079-10:2002)
Matériel électrique pour atmosphères explosives gazeuses Partie 10: Classement des emplacements dangereux (CEI 60079-10:2002)
Elektrische Betriebsmittel für gasexplosionsgefährdete Bereiche Teil 10: Einteilung der explosionsgefährdeten Bereiche (IEC 60079-10:2002)
This European Standard was approved by CENELEC on 2002-12-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

at national level by publication of an identical
national standard or by endorsement
(dop) 2003-12-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2005-12-01
Annexes designated "normative" are part of the body of the standard. Annexes designated "informative" are given for information only. In this standard, Annex ZA is normative and Annexes A, B and C are informative. Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60079-10:2002 was approved by CENELEC as a European Standard without any modification. __________

- 3 - EN 60079-10:2003 Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-426 1990 International Electrotechnical Vocabulary (IEV) Chapter 426: Electrical apparatus for explosive atmospheres
- - IEC 60079-4 1975 Electrical apparatus for explosive gas atmospheres Part 4: Method of test for ignition temperature
- - IEC 60079-4A 1970 Part 4: Method of test for ignition temperature – First supplement
- - IEC 60079-20 1996 Part 20: Data for flammable gases and vapours, relating to the use of electrical apparatus
- -
IEC 60079-10Edition 4.0 2002-06INTERNATIONAL STANDARD NORME INTERNATIONALEElectrical apparatus for explosive gas atmospheres – Part 10: Classification of hazardous areas
Matériel électrique pour atmosphères explosives gazeuses – Partie 10: Classement des emplacements dangereux
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XAICS 29.260.20 PRICE CODECODE PRIXISBN 2-8318-6379-1

60079-10  IEC:2002 – 3 –CONTENTSFOREWORD.3INTRODUCTION.41 General .51.1 Scope.51.2 Normative references .62 Definitions and terms.63 Safety and area classification.103.1 Safety principles.103.2 Area classification objectives.104 Area classification procedure.114.1 General.114.2 Sources of release .124.3 Type of zone .124.4 Extent of zone .134.4.1 Release rate of gas or vapour.134.4.2 Lower explosive limit (LEL).144.4.3 Ventilation .144.4.4 Relative density of the gas or vapour when it is released.144.4.5 Other parameters to be considered.154.4.6 Illustrative examples.155 Ventilation .165.1 General.165.2 Main types of ventilation.165.3 Degree of ventilation .165.4 Availability of ventilation.166 Documentation .176.1 General.176.2 Drawings, data sheets and tables.17Annex A (informative)
Examples of sources of release.18Annex B (informative)
Ventilation.20Annex C (informative)
Examples of hazardous area classification.36Figure C.1 − Preferred symbols for hazardous area zones.57Figure C.2 – Schematic approach to the classification of hazardous areas.58– 2 –60079-10 © IEC:2002

60079-10  IEC:2002 – 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSION____________ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES –Part 10: Classification of hazardous areasFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the InternationalOrganization for Standardization (ISO) in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)
In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)
The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)
Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60079-10 has been prepared by subcommittee 31J: Classificationof hazardous areas and installation requirements, of IEC technical committee 31: Electricalapparatus for explosive atmospheres.This fourth edition cancels and replaces the third edition published in 1995, and constitutes atechnical revision.The text of this standard is based on the following documents:FDISReport on voting31J/82/FDIS31J/84/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.Annexes A, B and C are for information only.The committee has decided that the contents of this publication will remain unchangeduntil 2007. At this date, the publication will be•reconfirmed;•withdrawn;•replaced by a revised edition, or•amended.– 3 –60079-10 © IEC:2002

60079-10  IEC:2002 – 7 –INTRODUCTIONIn areas where dangerous quantities and concentrations of flammable gas or vapour mayarise, protective measures are to be applied in order to reduce the risk of explosions. Thispart of IEC 60079 sets out the essential criteria against which the risk of ignition can beassessed, and gives guidance on the design and control parameters which can be used inorder to reduce such a risk.This standard can be used as a basis for the proper selection and installation of apparatus foruse in a hazardous area.60079-10 © IEC:2002– 4 –

60079-10  IEC:2002 – 9 –ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES –Part 10: Classification of hazardous areas1 General1.1 ScopeThis part of IEC 60079 is concerned with the classification of hazardous areas whereflammable gas or vapour risks may arise, in order to permit the proper selection andinstallation of apparatus for use in such hazardous areas.It is intended to be applied where there may be a risk of ignition due to the presence offlammable gas or vapour, mixed with air under normal atmospheric conditions (see note 2),but it does not apply toa)mines susceptible to firedamp;b)the processing and manufacture of explosives;c)areas where a risk may arise due to the presence of ignitable dusts or fibres;d)catastrophic failures which are beyond the concept of abnormality dealt with in thisstandard (see note 3);e)rooms used for medical purposes;f)areas where the presence of flammable mist may give rise to an unpredictable risk andwhich require special consideration (see note 5);g)domestic premises.This standard does not take into account the effects of consequential damage.Definitions and explanations of terms are given together with the main principles andprocedures relating to hazardous area classification.For detailed recommendations regarding the extent of the hazardous areas in specificindustries or applications, reference may be made to the codes relating to those industries orapplications.NOTE 1
For the purpose of this standard, an area is a three-dimensional region or space.NOTE 2
Atmospheric conditions include variations 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 explosion properties of theflammable materials.NOTE 3
Catastrophic failure in this context is applied, for example, to the rupture of a process vessel or pipelineand events th
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