EN 60079-20-1:2010

Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data

IEC 60079-20-1:2010 provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the maximum experimental safe gaps (MESG) for gas- or vapour-air mixtures under normal conditions of temperature and pressure so as to permit the selection of an appropriate group of equipment. The tabulated values of chemical and engineering properties of substances are provided to assist engineers in their selection of equipment to be used in hazardous areas. This first edition of IEC 60079-20-1 cancels and replaces the first edition of IEC 60079-1-1(2002), the second edition of IEC 60079-4 (1975), its amendment 1(1995) and its complement: IEC 60079-4A (1970), the first edition of IEC/TR 60079-12 (1978) and the first edition of IEC 60079-20 (1996). It constitutes a technical revision.

Explosionsfähige Atmosphären - Teil 20-1: Stoffliche Eigenschaften zur Klassifizierung von Gasen und Dämpfen - Prüfmethoden und Daten

Atmosphères explosives - Partie 20-1: Caractéristiques des substances pour le classement des gaz et des vapeurs - Méthodes et données d'essai

La CEI 60079-20-1:2010 donne des lignes directrices pour le classement des gaz et des vapeurs. Elle décrit une méthode d'essai destinée à mesurer les interstices expérimentaux maximaux de sécurité (IEMS) des mélanges de gaz ou de vapeurs et d'air dans des conditions normales de température et de pression de manière à permettre le choix d'un groupe approprié de matériels. Les valeurs des propriétés chimiques et physiques des substances données dans les tableaux sont destinées à aider les ingénieurs pour le choix des matériels utilisés dans des zones dangereuses. Cette première édition de la CEI 60079-20-1 annule et remplace la première édition de la CEI 60079-1-1 (2002), la deuxième édition de la CEI 60079-4 (1975), son amendement 1 (1995) et son complément: la CEI 60079-4A (1970), la première édition du CEI/TR 60079-12 (1978) et la première édition de la CEI 60079-20 (1996). Elle constitue une révision technique.

Eksplozivne atmosfere - 20-1. del: Lastnosti materiala - Razvrstitev plinov in hlapov, preskusne metode in podatki (IEC 60079-20-1:2010)

Ta del IEC 60079 zagotavlja vodilo za razvrstitvi plinov in hlapov. Opisuje preskusno metodo za merjenje maksimalnih preskusnih varnih vrzeli (MESG) za mešanice plin-zrak ali hlap-zrak pod običajnimi pogoji  temperature in pritiska, da je omogočena izbira primerne skupine opreme.  Metoda ne upošteva možnih učinkov ovir na varnih vrzelih. Ta standard prav tako opisuje preskusno metodo, namenjeno za uporabo pri določitvi temperature samovžiga kemično čistih hlapov ali plina v zraku pri atmosferskem tlaku.    Tabelirane vrednosti kemičnih in tehničnih lastnosti substanc so podane v pomoč inženirjem pri njihovi izbiri opreme za uporabo na nevarnih področjih. Pričakuje se, da bodo občasno objavljeni nadaljnji podatki, in sicer, ko bodo na voljo rezultati preskusov, opravljenih v več državah.    Področje uporabe teh podatkov je bilo izbrano s posebnim ozirom na uporabo opreme na nevarnih območjih, pri čemer so se upoštevale standardne meritvene metode.

General Information

• Status: Withdrawn
• Publication Date: 25-Feb-2010
• Withdrawal Date: 31-Jan-2013
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: CLC/TC 31 - Electrical apparatus for explosive atmospheres - General requirements
• Drafting Committee: IEC/TC 31 - Electrical apparatus for potentially explosive atmospheres
• Parallel Committee: IEC/TC 31 - Electrical apparatus for potentially explosive atmospheres
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 30-Apr-2022
• Completion Date: 30-Apr-2022
• 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 60079-20-1:2010 - Explosive atmospheres - Part 20-1: Material characteristics - Gas and vapour classification, test methods and data (IEC 60079-20-1:2010)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2010
Eksplozivne atmosfere - 20-1. del: Lastnosti materiala - Razvrstitev plinov in
hlapov, preskusne metode in podatki (IEC 60079-20-1:2010)
Explosive atmospheres - Part 20-1: Material characteristics - Gas and vapour
classification, test methods and data (IEC 60079-20-1:2010)
Explosionsfähige Atmosphären - Teil 20-1: Stoffliche Eigenschaften zur Klassifizierung
von Gasen und Dämpfen - Prüfmethoden und Daten (IEC 60079-20-1:2010)
Atmosphères explosives - Partie 20-1: Caractéristiques des matériaux pour le
classement des gaz et des vapeurs, méthodes et données d'essai (CEI 60079-20-
1:2010)
Ta slovenski standard je istoveten z: EN 60079-20-1:2010
ICS:
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.

EUROPEAN STANDARD
EN 60079-20-1
NORME EUROPÉENNE
February 2010
EUROPÄISCHE NORM
ICS 29.260.20
English version
Explosive atmospheres -
Part 20-1: Material characteristics for gas and vapour classification -
Test methods and data
(IEC 60079-20-1:2010)
Atmosphères explosives -  Explosionsfähige Atmosphären -
Partie 20-1: Caractéristiques Teil 20-1: Stoffliche Eigenschaften
des substances pour le classement zur Klassifizierung von Gasen
des gaz et des vapeurs - und Dämpfen -
Méthodes et données d'essai Prüfmethoden und Daten
(CEI 60079-20-1:2010) (IEC 60079-20-1:2010)

This European Standard was approved by CENELEC on 2010-02-01. 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, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-20-1:2010 E
Foreword
The text of document 31/837/FDIS, future edition 1 of IEC 60079-20-1, prepared by IEC TC 31,
Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60079-20-1 on 2010-02-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-02-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 94/9/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-20-1:2010 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60079-20-1:2010
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

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 60079-11 - Explosive atmospheres - EN 60079-11 -
Part 11: Equipment protection by intrinsic
safety "i"
IEC 60079-14 - Explosive atmospheres - EN 60079-14 -
Part 14: Electrical installations design,
selection and erection
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers only the
following essential requirements out of those given in Annex II of the EC Directive 94/9/EC:
– Essential Requirement 1.0.1
– Essential Requirement 1.2.1, 1.2.3, 1.2.9
− Essential Requirement 1.5.7
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive(s) concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
IEC 60079-20-1 ®
Edition 1.0 2010-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 20-1: Material characteristics for gas and vapour classification – Test
methods and data
Atmosphères explosives –
Partie 20-1: Caractéristiques des substances pour le classement des gaz et des
vapeurs – Méthodes et données d’essai

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XC
CODE PRIX
ICS 29.260.20 ISBN 2-8318-1076-2
– 2 – 60079-20-1 © IEC:2010
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Classification of gases and vapours.7
4.1 General .7
4.2 Classification according to the maximum experimental safe gaps (MESG).7
4.3 Classification according to the minimum igniting currents (MIC) .8
4.4 Classification according to MESG and MIC.8
4.5 Classification according to a similarity of chemical structure.8
4.6 Classification of mixtures of gases .8
5 Data for flammable gases and vapours, relating to the use of equipment.9
5.1 Determination of the properties .9
5.1.1 General .9
5.1.2 Equipment group .9
5.1.3 Flammable limits .9
5.1.4 Flash point FP .9
5.1.5 Temperature class.10
5.1.6 Minimum igniting current (MIC) .10
5.1.7 Auto-ignition temperature .10
5.2 Properties of particular gases and vapours.10
5.2.1 Coke oven gas .10
5.2.2 Ethyl nitrite .10
5.2.3 MESG of carbon monoxide .10
5.2.4 Methane, Group IIA .11
6 Method of test for the maximum experimental safe gap .11
6.1 Outline of method.11
6.2 Test apparatus .11
6.2.1 General .11
6.2.2 Mechanical strength .12
6.2.3 Interior chamber .12
6.2.4 Exterior chamber .12
6.2.5 Gap adjustment .12
6.2.6 Injection of mixture .12
6.2.7 Source of ignition .12
6.2.8 Materials of test apparatus .12
6.3 Procedure .12
6.3.1 Preparation of gas mixtures .12
6.3.2 Temperature and pressure .12
6.3.3 Gap adjustment .13
6.3.4 Ignition .13
6.3.5 Observation of the ignition process.13
6.4 Determination of maximum experimental safe gap (MESG) .13
6.4.1 Preliminary tests.13
6.4.2 Confirmatory tests .13
6.4.3 Reproducibility of maximum experimental safe gaps.13

60079-20-1 © IEC:2010 – 3 –
6.4.4 Tabulated values .13
6.5 Verification of the MESG determination method.14
7 Method of test for auto-ignition temperature .14
7.1 Outline of method.14
7.2 Apparatus.14
7.2.1 General .14
7.2.2 Test flask.14
7.2.3 Furnace.15
7.2.4 Thermocouples.15
7.2.5 Sampling syringes or pipettes.15
7.2.6 Timer.15
7.2.7 Mirror .15
7.3 Procedure .15
7.3.1 Sample injection .15
7.3.2 Observations .16
7.3.3 Subsequent tests.16
7.3.4 Confirmatory tests .16
7.4 Auto-ignition temperature .16
7.5 Validity of results.16
7.5.1 Repeatability .16
7.5.2 Reproducibility.
...