EN 60079-2:2007

SLOVENSKI STANDARD
01-marec-2008
1DGRPHãþD
SIST EN 60079-2:2005
(NVSOR]LYQHDWPRVIHUHGHO=DãþLWDRSUHPH]QDGWODNRPS,(&
Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p"
Explosionsfähige Atmosphäre - Teil 2: Geräteschutz durch Überdruckkapselung "p"
Atmospheres explosives - Partie 2: Protection du matériel par enveloppe a surpression
interne "p"
Ta slovenski standard je istoveten z: EN 60079-2:2007
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 60079-2
NORME EUROPÉENNE
November 2007
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 60079-2:2004

English version
Explosive atmospheres -
Part 2: Equipment protection by pressurized enclosure "p"
(IEC 60079-2:2007)
Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 2: Protection du matériel Teil 2: Geräteschutz
par enveloppe à surpression interne "p" durch Überdruckkapselung "p"
(CEI 60079-2:2007) (IEC 60079-2:2007)

This European Standard was approved by CENELEC on 2007-11-01. 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, 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: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-2:2007 E
Foreword
The text of document 31/668/FDIS, future edition 5 of IEC 60079-2, prepared by IEC TC 31, Equipment
for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60079-2 on 2007-11-01.
This European Standard supersedes EN 60079-2:2004 + corrigendum April 2006.
The significant changes with respect to EN 60079-2:2004 are listed below:
– introduction of the “Equipment protection level concept” – See Annex H;
– 3.13 eliminate reference to “room” in the definition of pressurization;
– 5.3.3 restrict to type px;
– 5.3.3 add warning for type pz and type py for any cover removable without the use of a tool;
– 7.6 move wording “For type px” to beginning of subclause to clarify 7.6 only applies to type px;
– 7.7 c) clarify that the instruction label should specify purge time and pressure/flow;
– 18.7 collect marking requirements throughout the document in the “Marking” clause.
This European Standard is to be read in conjunction with EN 60079-0:2006.
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) 2008-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-11-01
This European Standard was prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and supports the essential requirements of
Directive 94/9/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
- 3 - EN 60079-2:2007
Endorsement notice
The text of the International Standard IEC 60079-2:2007 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
Harmonized in EN 60051 series (not modified).
IEC 60051 NOTE
IEC 60079-1 NOTE Harmonized as EN 60079-1:2007 (not modified).
IEC 60079-5 NOTE Harmonized as EN 60079-5:2007 (not modified).
IEC 60079-6 NOTE Harmonized as EN 60079-6:2007 (not modified).
IEC 60079-7 NOTE Harmonized as EN 60079-7:2007 (not modified).
Harmonized as EN 60079-11:2007 (not modified).
IEC 60079-11 NOTE
Harmonized as EN 60079-15:2005 (not modified).
IEC 60079-15 NOTE
IEC 60079-18 NOTE Harmonized as EN 60079-18:2004 (not modified).
IEC 60079-26 NOTE Harmonized as EN 60079-26:2007 (not modified).
IEC 60079-28 NOTE Harmonized as EN 60079-28:2007 (not modified).
__________
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

1) 2)
IEC 60034-5 – Rotating electrical machines - EN 60034-5 2001
Part 5: Degrees of protection provided by the
integral design of rotating electrical machines
(IP code) - Classification
1)
IEC 60050-151 – International Electrotechnical Vocabulary - – –
Part 151: Electrical and magnetic devices

1)
IEC 60050-426 – International Electrotechnical Vocabulary - – –
Chapter 426: Electrical apparatus for
explosive atmospheres
IEC 60079-0 2004 Electrical apparatus for explosive gas EN 60079-0 2006
(mod) atmospheres -
Part 0: General requirements
1) 2)
IEC 60112 – Method for the determination of the proof EN 60112 2003
and the comparative tracking indices of solid
insulating materials
1) 2)
IEC 60529 – Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993

3)
IEC 60664-1 1992 Insulation coordination for equipment within EN 60664-1 2003
low-voltage systems -
Part 1: Principles, requirements and tests

1)
Undated reference.
2)
Valid edition at date of issue.
3)
EN 60664-1:2003, which includes A1:2000 + A2:2002 to IEC 60664-1:1992, is superseded by EN 60664-1:2007,
which is based on IEC 60664-1:2007.

- 5 - EN 60079-2:2007
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:
– ER 1.0.1 to ER 1.0.6;
– ER 1.2.1, ER 1.2.2 (partly), ER 1.2.3, ER 1.2.6 to ER 1.2.8;
– ER 1.3.1, ER 1.3.5;
– ER 1.4.1 (partly);
– ER 1.5.1 to ER 1.5.8;
– ER 1.6.2 (partly), ER 1.6.3 to ER 1.6.5;
– ER 2.0.2.1, ER 2.0.2.2;
– ER 2.2.1, ER 2.2.1.1 to ER 2.2.1.3;
– ER 2.3.1, ER 2.3.1.1, ER 2.3.1.2.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
___________
NORME CEI
INTERNATIONALE
IEC
60079-2
INTERNATIONAL
Cinquième édition
STANDARD
Fifth edition
2007-02
Atmosphères explosives –
Partie 2:
Protection du matériel par enveloppe à
surpression interne «p»
Explosive atmospheres –
Part 2:
Equipment protection by pressurized
enclosure «p»
© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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PRICE CODE
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For price, see current catalogue

60079-2 © IEC:2007 – 3 –
CONTENTS
FOREWORD.9
INTRODUCTION.13

1 Scope.15
2 Normative references .15
3 Terms and definitions .17
4 Protection types .21
5 Constructional requirements for pressurized enclosures .27
5.1 Enclosure .27
5.2 Materials .27
5.3 Doors and covers .27
5.4 Mechanical strength .29
5.5 Apertures, partitions, compartments and internal components .29
5.6 Insulating materials .31
5.7 Sealing.31
5.8 Spark and particle barriers .31
5.9 Internal batteries .31
6 Temperature limits.33
6.1 General .33
6.2 For type px or type py.33
6.3 For type pz.33
7 Safety provisions and safety devices (except for static pressurization) .33
7.1 Suitability of safety devices for hazardous area.33
7.2 Integrity of safety devices.33
7.3 Provider of safety devices .35
7.4 Sequence diagram for type px .35
7.5 Ratings for safety devices .35
7.6 Purging automated for type px.35
7.7 Purging criteria.37
7.8 Requirements when a minimum flow rate required.37
7.9 Safety devices to detect overpressure .37
7.10 Value of overpressure .39
7.11 Pressurizing multiple enclosures .41
7.12 Safety devices on doors and covers .41
7.13 Protection types that may remain energized .41
7.14 Protection types permitted within type py.41
8 Safety provisions and safety devices for static pressurization.41
8.1 Suitability of safety devices for hazardous area.41
8.2 Protective gas .43
8.3 Internal sources of release .43
8.4 Filling procedure .43
8.5 Safety devices.43
8.6 Protection types that may remain energized .43
8.7 Overpressure .43

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