SIST EN 60079-2:2008
Explosive atmospheres -- Part 2: Equipment protection by pressurized enclosure p
Explosive atmospheres -- Part 2: Equipment protection by pressurized enclosure p
This part of IEC 60079 contains the specific requirements for the construction and testing of electrical apparatus with pressurized enclosures, of type of protection "p", intended for use in explosive gas atmospheres. It specifies requirements for pressurized enclosures containing a limited release of a flammable substance. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard takes precedence. This standard does not contain the requirements for: - pressurized enclosures where the containment system may release a) air with an oxygen content greater than normal, or b) oxygen in combination with inert gas in a proportion greater than 21 %; - pressurized rooms or analyser houses; see IEC 60079-13 and IEC 60079-16.
Explosionsfähige Atmosphäre - Teil 2: Geräteschutz durch Überdruckkapselung p
Atmosphères explosives -- Partie 2: Protection du matériel par enveloppe à surpression interne p
La présente partie de la CEI 60079 contient les exigences spécifiques pour la construction et les essais des matériels électriques avec enveloppes à surpression interne à mode de protection 'p', destinés à l'utilisation dans les atmosphères explosives gazeuses. Elle spécifie les exigences pour les enveloppes à surpression interne contenant un dégagement limité de substance inflammable. Le changement significatifs par rapport à l'édition précédente est l'introduction du 'Concept du niveau de protection des équipements'
Eksplozivne atmosfere - 2. del: Zaščita opreme z nadtlakom "p" (IEC 60079-2:2007)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60079-2:2008
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
SIST EN 60079-2:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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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
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EN 60079-2:2007 - 2 -
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.
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- 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).
__________
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EN 60079-2:2007 - 4 -
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.
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- 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.
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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.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
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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International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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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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60079-2 © IEC:2007 – 5 –
9 Supply of protective gas .43
9.1 Type of gas .43
9.2 Temperature.45
10 Pressurized equipment with an internal source of release.45
11 Release conditions .45
11.1 No release.45
11.2 Limited release of a gas or vapour.45
11.3 Limited release of a liquid.45
12 Design requirements for the containment system.47
12.1 General design requirements.47
12.2 Infallible containment system .47
12.3 Containment system with a limited release .47
13 Protective gas and pressurizing techniques .49
13.1 General .49
13.2 Pressurization with leakage compensation .51
13.3 Pressurization with dilution.51
14 Ignition-capable apparatus .53
15 Internal hot surfaces.53
16 Type verification and tests.55
16.1 Maximum overpressure test.55
16.2 Leakage test .55
16.3 Purging test for pressurized enclosures with no internal source of release
(pressurization technique may be leakage compensation or continuous flow)
and filling procedure test for static pressurization .55
16.4 Purging and dilution tests for a pressurized enclosure with an internal source
of release .57
16.5 Verification of minimum overpressure.61
16.6 Tests for an infallible containment system .61
16.7 Overpressure test for a containment system with a limited release .63
16.8 Verifying ability of the pressurized enclosure to limit internal pressure .63
17 Routine tests .65
17.1 Functional test.65
17.2 Leakage test .65
17.3 Tests for an infallible containment system .65
17.4 Test for a containment system with a limited release .65
18 Marking .65
18.1 Identifying as pressurized.65
18.2 Warnings.65
18.3 Supplementary marking.65
18.4 Internal source of release.67
18.5 Static pressurization.67
18.6 Pressurization systems.67
18.7 Warnings required in other clauses .67
18.8 Overpressure limited by user.67
18.9 Inert gas.69
19 Instructions.69
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60079-2 © IEC:2007 – 7 –
Annex A (normative) Purging and dilution tests.71
Annex B (informative) Examples of functional sequence diagram.75
Annex C (informative) Examples of the changes in pressure in ducts and enclosures .79
Annex D (informative) Information to be provided to the user .89
Annex E (normative) Classification of the type of release within enclosures .93
Annex F (informative) Examples for the use of the dilution area concept.95
Annex G (normative) Infallibility test for containment system.99
Annex H (informative) Introduction of an alternative risk assessment method
encompassing “equipment protection levels” for Ex equipment .101
Bibliography.111
Figure B.1 – State diagram of a leakage-compensation purge control system .75
Figure C.1 a) – Protective gas outlet without a spark and particle barrier .79
Figure C.1 b) – Protective gas outlet with a spark and particle barrier.81
Figure C.2 – Pressurized enclosures with leakage compensation, enclosures without
moving parts .83
Figure C.3 – Pressurized enclosures with leakage compensation, rotating electrical
machine with an internal cooling fan .85
Figure C.4 – Pressurized enclosure with a leakage compensation, rotating electrical
machine with an external cooling fan .87
Figure F.1 – Diagram showing the use of the dilution area concept to simplify the purge
and dilution test requirements .95
Figure F.2 – Diagram showing the use of the infallible containment system concept to
simplify the purging and dilution requirements around ICA.97
Figure F.3 – Diagram showing the use of internal partitions around the potential source
of release to simplify the purging and dilution requirements around ICA located outside
the partitions.97
Figure G.1 – Schematic diagram of the infallibility test described in 16.6.2 a) .99
Table 1 – Determination of protection type.23
Table 2 – Design criteria based upon type of protection.25
Table 3 – Safety devices based upon protection type.35
Table 4 – Protective gas requirements for a pressurized enclosure with a containment
system .49
Table 5 – Protection types permitted within the dilution area.53
Table B.1 – Truth table of a leakage-compensation purge control system .75
Table H.1 – Traditional relationship of EPLs to zones (no additional risk assessment) .105
Table H.2 – Description of risk of ignition protection provided .107
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60079-2 © IEC:2007 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 2: Equipment protection by pressurized enclosure "p"
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60079-2 has been prepared by technical committee 31: Explosive
atmospheres.
This fifth edition cancels and replaces the fourth edition published in 2001 and constitutes a
technical revision.
The significant changes with respect to the previous edition 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.
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60079-2 © IEC:2007 – 11 –
– 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.
The text of this standard is based on the following documents:
FDIS Report on voting
31/668/FDIS 31/681/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 standard is to be read in conjunction with IEC 60079-0:2004, Electrical apparatus for
explosive gas atmospheres – Part 0: General requirements.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60079 series, under the general title Explosive atmospheres can be
found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the new edition.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site 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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