Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p" (IEC 60079-2:2014)

This part of IEC 60079 contains the specific requirements for the construction and testing of
electrical equipment with pressurized enclosures, of type of protection “p”, intended for use in
explosive gas atmospheres or explosive dust atmospheres. It also includes the 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 take precedence.
This standard does not include 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 where the oxygen is in a proportion greater than
21 %.
• pressurized rooms or analyser houses; see IEC 60079-13;
• pressurized enclosures used where “explosives” or pyrotechnics are present;
• pressurized enclosures used where hybrid mixtures of gas/vapour and combustible dust
are present;
• pressurized enclosures used where pyrophoric substances such as explosives or
propellants containing their own oxidizers are present
• pressurized enclosures with an internal source of release of combustible dust.
NOTE When the user acts in the role of the manufacturer, it is typically the user’s responsibility to ensure that all
relevant parts of this standard are applied to the manufacturing and testing of the equipment.

Explosionsgefährdete Bereiche - Teil 2: Geräteschutz durch Überdruckkapselung “ p“ (IEC 60079-2:2014)

Atmosphères explosives - Partie 2: Protection du matériel par enveloppe à surpression interne "p" (IEC 60079-2:2014)

NEW! IEC 60079-2:2014 est disponible sous forme de IEC Standards+ 60079-2:2014 qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente. L'IEC 60079-2:2014 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 ou les atmosphères de poussière explosives. Elle inclut également les exigences pour les enveloppes à surpression interne contenant un dégagement limité de substance inflammable. La présente Norme complète et modifie les exigences générales de l'IEC 60079-0. Lorsqu'une exigence de la présente Norme entre en conflit avec une exigence de l'IEC 60079-0, c'est l'exigence de la présente Norme qui prévaut. La présente Norme ne comprend pas les exigences pour: - les enveloppes à surpression interne lorsque le système de confinement peut dégager de l'air avec une teneur en oxygène supérieure à la normale, ou un mélange d'oxygène et de gaz inerte dans une proportion d'oxygène supérieure à 21 %; - les salles à surpression interne ou les bâtiments pour analyseurs; voir l'IEC 60079-13; - les enveloppes à surpression interne utilisées lorsque des "explosifs" ou des éléments pyrotechniques sont présents; - les enveloppes à surpression interne utilisées lorsque des mélanges hybrides de gaz/vapeur et de poussière combustible sont présents; - les enveloppes à surpression interne utilisées lorsque des substances pyrophoriques telles que des explosifs ou des charges de poudre contenant leurs propres oxydants sont présentes; - les enveloppes à surpression interne avec une source interne de dégagement de poussière combustible. Cette sixième édition annule et remplace la cinquième édition parue en 2007. Cette sixième édition annule et remplace la première édition de l'IEC 61241-4 parue en 2001. Cette sixième édition constitue une révision technique. L'importance des modifications entre l'IEC 60079-2, Édition 6.0, 2014 et l'IEC 60079-2, Édition 5.0, 2007, sont identifiés dans l'avant-propos du document. Mots clés: matériels électriques avec enveloppes à surpression interne, mode de protection "p", atmosphères explosives gazeuses, atmosphères de poussière explosives

Eksplozivne atmosfere - 2. del: Zaščita opreme z nadtlakom "p" (IEC 60079-2:2014)

Ta del standarda IEC 60079 vsebuje specifične zahteve za konstrukcijo in preskušanje električne opreme, zaščitene z nadtlakom »p«, ki je namenjena za uporabo v eksplozivnih plinskih atmosferah ali eksplozivnih prašnih atmosferah. Vključuje tudi zahteve za ohišja v nadtlaku z omejenim sproščanjem vnetljivih snovi.
Ta standard dopolnjuje in spreminja splošne zahteve standarda IEC 60079-0. Kadar je zahteva iz tega standarda v nasprotju z zahtevo iz standarda IEC 60079-0, ima prednost zahteva iz tega standarda.
Ta standard ne določa zahtev za:
• ohišja v nadtlaku, pri katerih zadrževalni sistem lahko sprosti
a) zrak z vsebnostjo kisika, višjo od običajne, ali
b) kisik v kombinaciji z inertnim plinom, pri čemer je vsebnost kisika višja od 21 %.
• zaprte prostore z nadtlakom ali prostore za analiziranje; glej standard IEC 60079-13;
• ohišja v nadtlaku, ki se uporabljajo ob prisotnosti »eksplozivov« ali pirotehnike;
• ohišja v nadtlaku, ki se uporabljajo ob prisotnosti hibridnih mešanic plina/hlapov in gorljivega prahu;
• ohišja v nadtlaku, ki se uporabljajo ob prisotnosti pirofornih snovi, kot so eksplozivi ali pogonska goriva, ki vsebujejo svoje oksidante;
• ohišja v nadtlaku, ki vsebujejo notranji vir sproščanja gorljivega prahu.
OPOMBA Ko je uporabnik v vlogi izdelovalca, je običajno uporabnik odgovoren, da zagotovi uveljavitev vseh ustreznih delov tega standarda pri izdelavi in preskušanju opreme.

General Information

Status
Published
Publication Date
15-Mar-2015
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Jan-2015
Due Date
23-Mar-2015
Completion Date
16-Mar-2015

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosionsgefährdete Bereiche - Teil 2: Geräteschutz durch Überdruckkapselung “ p“ (IEC 60079-2:2014)Atmosphères explosives - Partie 2: Protection du matériel par enveloppe à surpression interne "p" (IEC 60079-2:2014)Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p" (IEC 60079-2:2014)29.260.20Electrical apparatus for explosive atmospheresICS:Ta slovenski standard je istoveten z:EN 60079-2:2014SIST EN 60079-2:2015en01-april-2015SIST EN 60079-2:2015SLOVENSKI

STANDARDSIST EN 61241-4:2007SIST EN 60079-2:20081DGRPHãþD
SIST EN 60079-2:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 60079-2
December 2014 ICS 29.260.20
Supersedes
EN 60079-2:2007, EN 61241-4:2006
English Version

Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p" (IEC 60079-2:2014)

Atmosphères explosives - Partie 2: Protection du matériel par enveloppe à surpression interne "p" (IEC 60079-2:2014)

Explosionsgefährdete Bereiche - Teil 2: Geräteschutz durch Überdruckkapselung "p" (IEC 60079-2:2014) This European Standard was approved by CENELEC on 2014-08-25. 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 © 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60079-2:2014 E SIST EN 60079-2:2015

EN 60079-2:2014 - 2 - Foreword The text of document 31/1119/FDIS, future edition 6 of IEC 60079-2, prepared by IEC/TC 31 "Equipment for explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60079-2:2014. The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-06-19 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-08-25

This document supersedes EN 60079-2:2007 and EN 61241-4:2006. The State of the Art is included in Annex ZY “Significant changes between this European Standard and EN 60079-2:2007”. For the significant changes with respect to EN 60079-2:2007, see Annex ZY. This standard is to be read in conjunction with EN 60079-0. 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. This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this document. Endorsement notice The text of the International Standard IEC 60079-2:2014 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: IEC 60051 NOTE Harmonized in EN 60051 series. IEC 60079-1 NOTE Harmonized as EN 60079-1. IEC 60079-5 NOTE Harmonized as EN 60079-5. IEC 60079-6 NOTE Harmonized as EN 60079-6. SIST EN 60079-2:2015

- 3 - EN 60079-2:2014 IEC 60079-7 NOTE Harmonized as EN 60079-7. IEC 60079-13 NOTE Harmonized as EN 60079-13. IEC 60079-18 NOTE Harmonized as EN 60079-18. IEC 60079-20-1 NOTE Harmonized as EN 60079-20-1. IEC 60079-26 NOTE Harmonized as EN 60079-26. IEC 60079-28 NOTE Harmonized as EN 60079-28. IEC 61511 NOTE Harmonized in EN 61511 series.

SIST EN 60079-2:2015
EN 60079-2:2014 - 4 - 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 60034-5 -

Rotating electrical machines - Part 5: Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification EN 60034-5 -

IEC 60050 series
International Electrotechnical Vocabulary
- - IEC 60079-0
Explosive atmospheres - Part 0: Equipment - General requirements EN 60079-0 -
IEC 60079-11 -

Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" EN 60079-11 -

IEC 60079-15 -

Explosive atmospheres - Part 15: Equipment protection by type of protection "n" EN 60079-15 -

IEC 60112 -

Method for the determination of the proof and the comparative tracking indices of solid insulating materials EN 60112 -

IEC 60127 series
Miniature fuses
EN 60127 series
IEC 60529 -
Degrees of protection provided by enclosures (IP Code) EN 60529 -
IEC 60664-1 -

Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests EN 60664-1 -

SIST EN 60079-2:2015
- 5 - EN 60079-2:2014 Annex ZZ (informative)

Coverage of Essential Requirements of EU 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 EU 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 1.2.4 (partly), 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 2.2.2.1 to 2.2.2.4; – ER 2.3.1, ER 2.3.1.1, ER 2.3.1.2; – ER 2.3.2.1 to 2.3.2.3. Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive[s] concerned. WARNING: Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard. SIST EN 60079-2:2015

EN 60079-2:2014 - 6 - Annex ZY (informative)

Significant changes between this European Standard and EN 60079-2:2007 This European Standard supersedes EN 60079-2:2007. The significant changes with respect to EN 60079-2:2007 are as listed below. Table ZY.1

Type Changes Clause Minor and editorial changes Extension Major technical changes Scope

Expanded to include combustible dust 1
Protective Gas
Replaced “apparatus” with “equipment” 3
Protective Gas

Revised to show that purging is not required for explosive dust atmospheres 3.16 X

Level of Protection “pxb”
Term and definitions revised to reflect EPL and level of protection 3.21 X
Level of Protection “pyb”
Term and definitions revised to reflect EPL and level of protection 3.22 X
Level of Protection “pzc”
Term and definitions revised to reflect EPL and level of protection 3.23 X
Lower Flammable Limit
Term and definition revised to agree with 60079-0 3.26 X
Upper Flammable Limit
Term and definition revised to agree with 60079-0 3.27 X
Table 1 – Determination of protection level
Revised to use EPL terminology Table 1 X
Table 2 – Design Criteria based upon level of protection
Revised to use EPL terminology Table 2 X
Enclosure
Requirements relaxed for specific designs 5.1
Group II and Group III pressurized enclosures
Text revised to use EPL terminology 5.3.3 X
Group II and Group III Level of Protection “pxb”
Added that warning also applies for explosive dust atmospheres 5.3.5
SIST EN 60079-2:2015
- 7 - EN 60079-2:2014

Type Changes Clause Minor and editorial changes Extension Major technical changes Group II and Group III door and cover warning

Added that warning also applies for explosive dust atmospheres 5.3.6
Group II and Group III door and cover warning
Revised warning from atmosphere “may be present” to “is present” 5.3.6 X
Mechanical Strength
Removed reference to 60079-0 by clause number for “X” condition 5.4 X
Spark and particle barriers
Removed reference to 60079-0 by clause number for “X” condition 5.9 X
Cells and batteries
Added requirements for cells and batteries 5.10
C1 For Level of Protection “pxb” or Level of Protection “pyb”
Revised Table to use terminology consistent with EPLs 6.2 X
Suitability of safety devices for hazardous area
Word “explosion” changed to “ignition” to reflect UFL/LFL terms 7.1 X
Integrity of safety devices
Added requirement for detecting fan failure 7.2
C2 Table 3 – Safety devices based upon Level of Protection
Revised column labels to use Level of Protection terminology Table 3 X
Provider of safety devices
Remove reference to 60079-0 by clause number for “X” condition 7.3 X
Pressurization System evaluated as associated equipment
Added requirements for pressurization systems 7.4
C3 Sequence diagram for Level of Protection “pxb”
Revised text to use Level of Protection terminology 7.5 X
Group I and Group II purging automated for Level of Protection “pxb”
Revised text to use Level of Protection terminology 7.7 X
Group I and Group II purging automated for Level of Protection “pxb”
Added text specifying that for “pxb”, control must be automated 7.7
C4 Group I or Group II – purging criteria
Revised text to use Level of Protection terminology 7.8 X
Group
III – cleaning
Added text for cleaning enclosures used in explosive dust atmospheres 7.9
Safety devices to detect minimum overpressure
Add word “minimum” to clause title to be consistent with text 7.11 X
SIST EN 60079-2:2015
EN 60079-2:2014 - 8 -

Type Changes Clause Minor and editorial changes Extension Major technical changes Safety devices to detect minimum overpressure

Revised text to use Level of Protection terminology 7.11 d) X
Value of minimum overpressure
Added word “minimum” to clause title to be consistent with text 7.12 X
Value of minimum overpressure
Revised text to use Level of Protection terminology 7.12 X
Value of minimum overpressure
Added text to reflect a note in Annex C 7.12
Pressurizing multiple enclosures
Revised text to use Level of Protection terminology 7.13 X
Safety devices on doors and covers
Revised text to use Level of Protection terminology 7.14 X
Equipment that may remain energized
Revised text to use EPL and level of protection terminology 7.15 X
Equipment permitted within Level of Protection “pyb”
Revised text to use EPL and level of protection terminology 7.16 X
Group I and Group II Filling procedure
Allow filling in a hazardous location if tested as non-hazardous 8.4
Group III Filling Procedure
Added static pressurization filling procedure for combustible dust 8.5
Safety devices
Revised text to use Level of Protection terminology 8.6
Equipment that may remain energized
Revised text to use EPL terminology 8.7 X
Overpressure
Removed reference to 60079-0 by clause number 8.8 X
Backup supply
Added requirements for a backup supply of protective gas 9.1
C5 Independent supplies
Provided requirements for independence of pressurization 9.2
C6 Release Conditions
Removed reference to 60079-0 by clause number for “X” condition 11.1.2 X
Containment system with a limited release
Removed reference to 60079-0 by clause number for “X” condition 12.3 X
13.3.3
Limited release of a gas or vapour
Revised text to reflect UFL/LFL terms 13.3.3 X
Ignition-capable equipment
Revised text to use Level of Protection terminology 14 X
Type verification and tests
Edition 5 clauses 16.1 to 16.7 moved to Edition 6 clauses 16.2 to 16.8 16 X
SIST EN 60079-2:2015
- 9 - EN 60079-2:2014

Type Changes Clause Minor and editorial changes Extension Major technical changes Determining the maximum overpressure rating

Added requirements to determine maximum overpressure 16.1
C7 Maximum overpressure test
Moved Maximum overpressure test to 16.2 16.2
C7 Maximum overpressure test
Moved Maximum overpressure test to 16.2 16.3.2
Tests for an infallible containment system
Clarify the rating used for the test 16.7.1
C8 Tests for an infallible containment system
Modified test for infallible containment 16.7.2

C9 bdition 5 − serifying ability of the pressurized enclosure to limit internal pressure

Eliminated test 16.8
C7 Functional test
Clarified that applies only to safety devices provided with enclosures 17.1 X
Tests for an infallible containment system
Waived helium leak tests for liquid systems 17.3
Supplementary marking
Allowed continued use of type of protection marking 18.3
Pressurization systems
Clarified use of Ex [p] and [Ex p] marking 18.6 X
Warnings required in other clauses
Added table number 18.7 X
Warnings required in other clauses
Added warning from 7.9 18.7
Warnings required in other clauses
Added warnings from Annex G and Annex H 18.7
C1 Instructions
Added requirements for Group III 19
Edition 5 Annex G –
Infallibility test for containment system
Deleted and replaced Annex G X
Edition 5 Annex H –

Introduction of an alternative risk assessment method encompassing “equipment protection levels”

Deleted and replaced Annex H X
Annex G –

Internal Cells and Batteries for Level of Protection “pxb” and Level of Protection “pyb”

Added requirements for cells and Batteries
Annex H –
Internal Cells and Batteries for Level of Protection “pzc”
Added requirements for cells and Batteries
SIST EN 60079-2:2015

EN 60079-2:2014 - 10 - NOTE The technical changes referred to include the significance of technical changes in the revised EN standard, but they do not form an exhaustive list of all modifications from the previous version. More guidance may be found by referring to the Redline Version of the standard. Explanations: A) Definitions minor and editorial changes – clarification

– decrease of technical requirements
– minor technical change
– editorial corrections

These are changes that 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 level of existing requirement. extension

addition of technical options These are changes that add new or modify existing technical requirements, in a way that new options are given, but without increasing requirements for equipment that was fully compliant with the previous standard. Therefore, these will not have to be considered for products in conformity with the preceding edition. major technical changes

– addition of technical requirements – increase of

technical requirements These are changes to technical requirements (addition, increase of the level or removal) made in a way that a product 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 products in conformity with the preceding edition. For these changes, additional information is provided in clause B) below. NOTE These changes represent current technological knowledge. However, these changes should not normally have an influence on equipment already placed on the market. B) Information about the background of ‘major technical changes’ C1 – Added annexes with requirements for using cells and batteries.

C2 –

Added requirement that fan failure cannot be based upon loss of power to the fan. C3 – Added requirements for equipment evaluated as a pressurization system to provide uniformity in the testing of such equipment.

C4 – Although, in Edition 5, the title of clause 7.6 stated automated purging, the word automated was not in the requirement.

It is intended that all “pxb” equipment have an automated purging system to prevent energizing of ignition capable circuits until the purge cycle has been properly completed.

This requires verifying that the flow is at least the minimum required for the purge time as well as verifying that the minimum overpressure exists within the enclosure.

C5 – If a backup supply of protective gas is provided, then both the primary and the backup supply needs to be capable of maintaining the required pressurization.

SIST EN 60079-2:2015

- 11 - EN 60079-2:2014 C6 – If a pressurized enclosure is used within a larger pressurized enclosure the protective gas supplies need to be independent.

C7 – The previous text in 16.1 of Edition 5, assumed that the enclosures had a maximum overpressure rating, but this is rarely the case. Some test houses relied upon the test in 16.8 to determine the maximum overpressure. Various methods were used to simulate regulator failure such as removing the regulator, but this also removed the orifices that would limit the flow. Based upon test house experience, the danger of flying fragments from the enclosure is acceptably small as either the enclosure or the gaskets will deform to relieve the internal pressure. A decision was taken to eliminate the overpressure test based upon the failed regulator. In addition, the definition of maximum overpressure is now based upon the value obtained when the pressurized enclosure is operated within its ratings. This maximum overpressure will generally occur when the equipment is in rapid purge mode with the maximum rated pressure applied to the inlet of the regulator. The Edition 5 text of 16.1 was modified and moved to 16.2.

C8 – The term overpressure in most cases implies operation outside of the normal ratings. Text was clarified to use the term “maximum operating pressure” rather than maximum internal overpressure. Test was 16.6.1 in Edition 5.

C9 –

The test was modified to use helium leak detection rather than rely on maintaining a vacuum since this would depend upon the capability of the vacuum system. Test was 16.6.2 in Edition 5.

SIST EN 60079-2:2015
SIST EN 60079-2:2015

IEC 60079-2 Edition 6.0 2014-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres –

Part 2: Equipment protection by pressurized enclosure "p"
Atmosphères explosives –
Partie 2: Protection du matériel par enveloppe à surpression interne "p"

INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XB ICS 29.260.20 PRICE CODE CODE PRIX ISBN 978-2-8322-1746-7

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®

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. SIST EN 60079-2:2015

– 2 – IEC 60079-2:2014 © 2014 CONTENTS FOREWORD ........................................................................................................................... 7 INTRODUCTION ................................................................................................................... 14 1 Scope ............................................................................................................................ 15 2 Normative references .................................................................................................... 15 3 Terms and definitions .................................................................................................... 16 4 Protection levels ............................................................................................................ 18 5 Constructional requirements for pressurized enclosures ................................................ 21 5.1 Enclosure ............................................................................................................. 21 5.2 Materials ............................................................................................................... 21 5.3 Doors and covers .................................................................................................. 21 5.3.1 Group I pressurized enclosures ..................................................................... 21 5.3.2 Group I pressurized enclosures with static pressurization .............................. 21 5.3.3 Group II and Group III pressurized enclosures ............................................... 21 5.3.4 Group II and Group III pressurized enclosures with static pressurization ........ 22 5.3.5 Group II and Group III Level of Protection “pxb” ............................................. 22 5.3.6 Group II and Group III Door and Cover warning ............................................. 22 5.4 Mechanical strength .............................................................................................. 22 5.5 Group I and Group II Apertures, partitions, compartments and internal components .......................................................................................................... 22 5.6 Apertures for Static Pressurization ........................................................................ 23 5.7 Insulating materials for Group I equipment ............................................................ 23 5.8 Sealing ................................................................................................................. 23 5.9 Spark and particle barriers .................................................................................... 23 5.10 Cells and batteries ................................................................................................ 24 6 Temperature limits ......................................................................................................... 24 6.1 General ................................................................................................................. 24 6.2 For Level of Protection “pxb” or Level of Protection “pyb” ...................................... 24 6.3 For Level of Protection “pzc” ................................................................................. 24 7 Safety provisions and safety devices (except for static pressurization) .......................... 24 7.1 Suitability of safety devices for hazardous area .................................................... 24 7.2 Integrity of safety devices ..................................................................................... 24 7.3 Provider of safety devices ..................................................................................... 25 7.4 Pressurization System evaluated as associated equipment ................................... 25 7.4.1 Pressurization systems for Level of Protection ”pzc”. ..................................... 25 7.4.2 Pressurization systems for Level of Protection ”pyb”. ..................................... 26 7.4.3 Pressurization systems for Level of Protection ”pxb”. ..................................... 26 7.5 Sequence diagram for Level of Protection “pxb” .................................................... 26 7.6 Ratings for safety devices ..................................................................................... 26 7.7 Group I and Group II Purging automated for Level of Protection “pxb” ................... 26 7.8 Group I or Group II − Purging criteria .................................................................... 27 7.9 Group III – Cleaning .............................................................................................. 27 7.10 Requirements when a minimum flow rate required ................................................ 27 7.11 Safety devices to detect minimum overpressure .................................................... 27 7.12 Value of minimum overpressure ............................................................................ 28 7.13 Pressurizing multiple enclosures ........................................................................... 29 7.14 Safety devices on doors and covers ...................................................................... 29 SIST EN 60079-2:2015

IEC 60079-2:2014 © 2014 – 3 –7.15 Equipment that may remain energized .................................................................. 29 7.16 Equipment permitted within Level of Protection “pyb” ............................................ 29 8 Safety provisions and safety devices for static pressurization ........................................ 30 8.1 Suitability of safety devices for hazardous area .................................................... 30 8.2 Protective gas ....................................................................................................... 30 8.3 Internal sources of release .................................................................................... 30 8.4 Group I and Group II Filling procedure .................................................................. 30 8.5 Group III Filling Procedure .................................................................................... 30 8.6 Safety devices ...................................................................................................... 30 8.7 Equipment that may remain energized .................................................................. 30 8.8 Overpressure ........................................................................................................ 30 9 Supply of protective gas ................................................................................................ 31 9.1 Backup supply ...................................................................................................... 31 9.2 Independent supplies ............................................................................................ 31 9.3 Type of gas ........................................................................................................... 31 9.4 Temperature ......................................................................................................... 31 10 Pressurized equipment with an internal source of release .............................................. 31 11 Release conditions ........................................................................................................ 31 11.1 No release ............................................................................................................ 31 11.2 Limited release of a gas or vapour ........................................................................ 32 11.3 Limited release of a liquid ..................................................................................... 32 12 Design requirements for the containment system ........................................................... 32 12.1 General design requirements ................................................................................ 32 12.2 Infallible containment system ................................................................................ 32 12.3 Containment system with a limited release ............................................................ 33 13 Protective gas and pressurizing techniques when there is an internal source of release .......................................................................................................................... 33 13.1 General ................................................................................................................. 33 13.2 Pressurization with leakage compensation ............................................................ 34 13.2.1 No release ..................................................................................................... 34 13.2.2 Limited release of a gas or liquid ................................................................... 34 13.3 Pressurization with dilution ................................................................................... 34 13.3.1 General ......................................................................................................... 34 13.3.2 No release ..................................................................................................... 34 13.3.3 Limited release of a gas or vapour ................................................................. 35 13.3.4 Limited release of a liquid .............................................................................. 35 14 Ignition-capable equipment ............................................................................................ 35 15 Internal hot surfaces ...................................................................................................... 35 16 Type verification and tests ............................................................................................. 36 16.1 Determining the maximum overpressure rating ........

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