prEN IEC 60079-2:2026

SLOVENSKI STANDARD
01-marec-2026
Eksplozivne atmosfere - 2. del: Zaščita opreme z nadtlakom "p"
Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p"
Explosionsgefährdete Bereiche - Teil 2: Geräteschutz durch Überdruckkapselung "p"
Atmosphères explosives - Partie 2: Protection du matériel par enveloppe à surpression
interne "p"
Ta slovenski standard je istoveten z: prEN IEC 60079-2:2026
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

31/1947/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-2 ED7
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-09 2026-03-06
SUPERSEDES DOCUMENTS:
31/1764/CDV, 31/1942/RVC
IEC TC 31 : EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
SECRETARIAT: SECRETARY:
United Kingdom Mr Tom Stack
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
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is drawn to the fact that this Committee Draft for Vote (CDV) is
submitted for parallel voting.
The CENELEC members are invited to vote through the CENELEC
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This document is still under study and subject to change. It should not be used for reference purposes.
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included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses. (SEE
AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Explosive atmospheres – Part 2: Equipment protection by pressurized enclosure "p"

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
The MT has requested a second CDV, with the instruction that comments should be limited to confirming that no unintended
issues have been introduced during the updates made in response to the first CDV.
No new technical comments should be submitted at this stage; any new technical input will be held for consideration in the
next edition. The rationale for this is that, should anything have been overlooked or inadvertently affected during the lates t
revisions, addressing it at the CDV stage is significantly more efficient.

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, o r any part of it, for any other purpose without
permission in writing from IEC.

IEC CDV 60079-2 © IEC 2026
CONTENTS
FOREWORD . 6
1 Scope . 16
2 Normative references . 21
3 Terms and definitions . 21
4 Levels of Protection . 24
5 Constructional requirements for pressurized enclosures . 27
5.1 Enclosure . 27
5.1.1 General . 27
5.1.2 Incorporating EPL Gc Ex Equipment or Ex Components . 27
5.2 Materials . 27
5.3 Doors and covers . 27
5.3.1 General . 27
5.3.2 Group I pressurized enclosures . 28
5.3.3 Group I pressurized enclosures with static pressurization . 28
5.3.4 Group II and Group III pressurized enclosures . 28
5.3.5 Group II and Group III pressurized enclosures with static pressurization . 28
5.3.6 Group II and Group III Level of Protection "pxb". 28
5.3.7 Group II and Group III door and cover warning . 28
5.4 Mechanical strength . 28
6 Constructional requirements for pressurized equipment . 28
6.1 Group I and Group II apertures, and partitions . 28
6.2 Group I and Group II internal components, compartments, and enclosures . 29
6.3 Apertures for static pressurization . 29
6.4 Insulating materials for Group I equipment . 29
6.5 Spark and particle barriers . 30
6.6 Bypass or override function . 30
7 Temperature limits . 30
7.1 General . 30
7.2 For Level of Protection “pxb” or Level of Protection “pyb” . 30
7.3 For Level of Protection "pzc" . 31
8 Safety devices and control functions of pressurization control systems (except for
static pressurization) . 31
8.1 General . 31
8.2 Provider of safety devices . 33
8.3 Pressurization Control Systems . 33
8.3.1 General . 33
8.3.2 For Level of Protection "pzc" . 33
8.3.3 For Level of Protection "pyb" . 34
8.3.4 For Level of Protection "pxb" . 34
8.3.5 Evaluated as Ex associated equipment . 34
8.4 Group I and Group II Purging for Level of Protection "pxb" . 35
8.5 Group I or Group II − Purging criteria . 35
8.6 Group III – Cleaning . 36
8.7 Requirements when a minimum flow rate required . 36
IEC CDV 60079-2 © IEC 2026
8.8 Safety devices to detect minimum pressurization overpressure . 37
8.9 Value of pressurization overpressure and maximum overpressure . 37
8.10 Pressurizing multiple enclosures . 38
8.11 Safety devices on doors and covers . 38
8.12 Equipment that may remain powered . 39
8.13 Equipment permitted within Level of Protection "pyb" . 39
9 Safety provisions and safety devices for static pressurization . 39
9.1 Suitability of safety devices for hazardous area . 39
9.2 Protective gas . 39
9.3 Internal sources of release . 39
9.4 Group I and Group II Filling procedure . 39
9.5 Group III Filling Procedure . 40
9.6 Safety devices . 40
9.7 Equipment that may remain powered . 40
9.8 Overpressure . 40
10 Supply of protective gas . 40
10.1 Backup supply . 40
10.2 Independent supplies . 41
10.3 Types of gas . 41
10.4 Temperature . 41
11 Pressurized equipment with an internal source of release . 41
11.1 General . 41
11.2 Release conditions. 43
11.2.1 No release . 43
11.2.2 Limited release of a gas or vapour . 43
11.2.3 Limited release of a liquid . 43
11.3 Design requirements for the containment system . 43
11.3.1 General design requirements . 43
11.3.2 Infallible containment system . 44
11.3.3 Containment system with a limited release . 44
11.3.4 Limiting of flammable substance flow . 45
11.3.5 Containment systems with a flame . 45
11.4 Protective gas and pressurizing techniques when there is an internal source
of release . 45
11.4.1 General . 45
11.4.2 Pressurization with leakage compensation . 46
11.4.3 Pressurization with dilution flow . 46
11.5 Equipment in undiluted volume . 47
11.6 Internal hot surfaces . 47
12 Cells and batteries within pressurized equipment . 48
12.1 General Requirements . 48
12.2 Cells or batteries used for memory backup applications . 48
12.3 Other cell and battery types . 48
12.4 Cell and battery related warnings . 48
12.4.1 General . 48
12.4.2 Relevant to EPL Mb, Gb or Db without other protection . 48
12.4.3 Relevant to EPL Gc or Dc without other protection . 49
IEC CDV 60079-2 © IEC 2026
12.4.4 Otherwise protected. 49
13 Type Verification and Tests . 49
13.1 General . 49
13.2 Verification of the maximum overpressure rating . 49
13.3 Maximum overpressure test . 49
13.4 Leakage test . 50
13.4.1 Other than static pressurization . 50
13.4.2 Static pressurization . 50
13.5 Purging and dilution flow tests . 50
13.5.1 General . 50
13.5.2 Criteria for compliance where the protective gas is air . 51
13.5.3 Criteria for compliance where the protective gas is inert . 51
13.6 Purging test for pressurized equipment with no internal source of release
and filling procedure test for static pressurization . 51
13.6.1 General . 51
13.6.2 Pressurized equipment where the protective gas is air . 51
13.6.3 Pressurized equipment where the protective gas is inert . 51
13.6.4 Pressurized equipment where the protective gas may be either air or an
inert gas with a density equal to air 10 % . 52
13.6.5 Filling procedure test for a pressurized equipment protected by static
pressurization . 52
13.7 Purging and dilution flow tests for a pressurized equipment with an internal
source of release . 52
13.7.1 Test gas . 52
13.7.2 Pressurized equipment where the flammable substance has less than a
volume fraction of 2 % oxygen and the protective gas is inert . 52
13.7.3 Pressurized equipment with pressurization by continuous flow,
containment system with less than a volume fraction of 21 % oxygen
and the protective gas is inert . 52
13.7.4 Pressurized equipment where the flammable substance is not a liquid,
pressurization by continuous flow and the protective gas is air . 53
13.8 Verification of minimum pressurization overpressure . 54
13.9 Tests for an infallible containment system . 54
13.9.1 Overpressure test . 54
13.9.2 Infallibility test . 54
13.10 Overpressure test for a containment system with a limited release . 54
13.11 Pressurization Control Systems . 55
14 Routine tests . 55
14.1 Functional test . 55
14.2 Leakage test . 55
14.3 Tests for an infallible containment system . 55
14.4 Test for a containment system with a limited release . 55
15 Marking . 55
15.1 General . 55
15.2 Identifying as pressurized . 55
15.3 Supplementary marking . 55
15.4 Internal source of release . 56
15.5 Static pressurization . 56
IEC CDV 60079-2 © IEC 2026
15.6 Pressurization control systems evaluated as Ex associated equipment . 56
15.7 Inert gas . 57
15.8 Internal flammable substance . 57
15.9 Warning markings . 57
15.10 Examples of marking . 58
16 Schedule drawings . 60
17 Instructions . 61
Annex A (informative) Design considerations for pressurized equipment that have
containment systems where the flammable material is a liquid . 63
A.1 General . 63
A.2 Classification of material state . 63
A.3 Design recommendations . 63
A.3.1 Flashing liquids . 63
A.3.2 Pooling liquids . 63
A.3.3 Leak Detection . 63
A.3.4 Isolation of flammable lines . 64
A.3.5 Drain & vent connections . 64
A.3.6 Flame detectors . 64
A.4 Dilution vs leakage compensation . 64
Annex B (informative) Examples of functional sequence diagram . 65
B.1 Information to User . 65
Annex C (informative) Examples of the changes in pressure in ducts and enclosures . 67
Annex D (informative)  Information intended to be provided to the user . 72
D.1 General . 72
D.2 Ducting of protective gas . 72
D.2.1 Location of inlet . 72
D.2.2 Ducting between pressurized equipment and inlet . 72
D.2.3 Outlets for protective gas . 72
D.2.4 Additional purge time to account for ducting . 73
D.2.5 Temperature of protective gas at the inlet . 73
D.3 Power for protective gas supply . 73
D.4 Static pressurization . 73
D.5 Pressurized Equipment with a containment system . 73
D.6 Pressurized Equipment maximum overpressure . 73
Annex E (normative) Classification of the type of release within pressurized equipment . 74
E.1 General . 74
E.2 No normal release, no abnormal release . 74
E.3 No normal release, limited abnormal release. 74
E.4 Limited normal release . 74
Annex F (informative)  Examples for the use of the diluted volume concept . 75
Annex G (informative) Evaluation of control functions and expected malfunctions . 78
Bibliography . 81

Figure 1 – Determination of Level of Protection. 25
Figure 2 – Determination of protection level and protective gas for equipment with
internal release . 42
IEC CDV 60079-2 © IEC 2026
Figure 3 Marking example 1 . 59
Figure 4 Marking example 2 . 59
Figure 5 Marking example 3 . 59
Figure 6 Marking example 4 . 59
Figure 7 Marking example 5 . 60
Figure 8 Marking example 6 . 60
Figure 9 Marking example 7 . 60
Figure 10 Marking example 8 . 60
Figure B.1 – State diagram of a leakage-compensation pressurization control system . 66
Figure C.1 – Protective gas outlet . 69
Figure C.2 – Pressurized enclosures with leakage compensation, enclosures without
moving parts . 69
Figure C.3 – Pressurized enclosures with leakage compensation, rotating electric
machine with an internal cooling fan . 70
Figure C.4 – Pressurized enclosure with a leakage compensation, rotating electric
machine with an external cooling fan . 71
Figure F.1 – Diagram showing the use of the diluted volume concept to simplify the
purge and dilution flow test requirements . 75
Figure F.2 – Diagram showing the use of the infallible containment system concept to
simplify the purging and dilution flow requirements around ICE . 76
Figure F.3 – Diagram showing the use of internal partitions around the potential source
of release to simplify the purging and dilution flow requirements around ICE located
outside the partitions . 76

Table 1 – Applicability of specific clauses of IEC 60079-0 . 17
Table 2 – Design criteria based upon Level of Protection . 26
Table 3 – Internal volumes that do not require purging . 29
Table 4 – Conditions for the determination of maximum surface temperature in electric
machines . 31
Table 5 – Control functions based upon Level of Protection . 32
Table 6 – Purging test requirements . 35
Table 7 – Equipment Protection Levels permitted within the undiluted volume based
upon the Level of Protection of the pressurized equipment . 47
Table 8 – Text of warning markings . 57
Table B.1 – Truth table of a leakage-compensation purge control system . 65
Table G.1 – Example of evaluation of pressurization control system elements for
control function . 79

IEC CDV 60079-2 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 2: Equipment protection by pressurization "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
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60079-2 has been prepared by IEC technical committee 31: Explosive atmospheres. It is
an International Standard.
This seventh edition cancels and replaces the sixth edition published in 2014. This edition
constitutes a technical revision.
Users of this document are advised that interpretation sheets clarifying the interpretation of this
document can be published. Interpretation sheets are available from the IEC webstore and can
be found in the "history" tab of the page for each document.
IEC CDV 60079-2 © IEC 2026
This edition includes the following significant technical changes with respect to the previous
edition:
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Whole document as needed, changed from  x
“electrical equipment” to “equipment” to make it
clear that the protection concept can be used for
non-electrical equipment as well
Whole document as needed, changed “energized”
to “powered” to cover non-electrical energy
sources
Clarification in scope that use of gas detection to 1 1 x
eliminate purging is not within the scope of the
document.
Added correlation table to 60079-0 1 x
Clarification in scope that other oxidizers present 1 1 x
in flammable material are not covered
Added normative reference to ISO 80079-36 for 2 2 x
non-electrical equipment to support move to
“equipment”
Added reference to IEC60050-151 and IEC 2 2 x
60050-426 for proper associated reference to IEV
sections.
Changed term dilution to dilution flow 3.3 3.3 x
Changed term dilution area to undiluted volume 3.4 3.5 x
Added definition for diluted volume 3.4 x
Update to term hermetically sealed device to align 3.7 3.8 x
with others
Clarification of what ignition-capable equipment 3.8 3.9 x
(ICE) is
Added definition for pressurization overpressure - 3.13.1 x
Added definition for maximum overpressure - 3.13.2 x
Clarified definition for pressurization control 3.14 3.15 x
system
Added definition for pressurized equipment - 3.17 x
Clarification in definition for purging that it applies 3.18 3.20 x
to the pressurized equipment
Various locations clarified based on newly defined Whole x
terms document
Replaced Table 1 and Table 4 with Figure 1 and 4 &13.1 4 &11.1 x
Figure 2
Clarification that nR ad other sealed Types of 4 4  C1
protection (nC, enclosed break dc) is not
permitted for EPL Gc on "pyb" equipment.
Direction on enclosure requirements for "pyb" and
- 5.1.2 B1
"pzc" when degree of protection (IP Code) rating
of IP54 enclosure is required for EPL Gc
equipment used
Addition of information for instructions about 5.3.1  C3
doors or covers
Moved text found previously in section 5.3.3 5.3.3 5.3.1 x for Group C4 for
about doors opening violently to a general II and III Group I
location in 5.3 so it applies to all Groups.
IEC CDV 60079-2 © IEC 2026
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Clarification that the Addition of a warning on the 5.3.5 5.3.6 X
enclosure from 60079-0 of "pxb" that requires
cool-down period
Clarification that safety device if overpressure can 5.4 5.4 x
occur that would cause deformation of enclosure
needs to comply with 8.3.1.
Separated part of the clause into new a clause for 5.5 to 5.10 6 x
items that pertain the pressurized equipment, not
just the pressurized enclosure
Added equivalent geometries for vents of internal 5.5.2 6.2 x
compartments as well as clarified and extended
volumes that do not need purged
Clarified that the section on sealing was relevant 5.8 13.1 x
to conduit and cable for sealing at installation.
Moved to testing section and instruction section.
Modified the Specific Condition of Use that if the 5.9 6.5  C6
spark and particle barrier is not included that the
protective vent shall discharge to a non-
hazardous area only
Added new section for bypass or override function 6.6  C8
Temperature limit related text moved 6 7 x
Moved detail that originally only applied to "pzc" 6.3 7.1  C9
so it would apply to all levels of protection that
the maximum surface temperature of the
pressurized equipment shall account for internal
equipment that has its own explosion protection
that may remain powered
Added new requirements for determining 6.2 0  C10
maximum surface temperatures of electric
machines in "pxb" and "pyb" including a new table
Retitled safety provisions and safety devices, 7 8 x
moved to re-numbered section
Added further details in table to better capture Table 3 Table 5 x
safety devices and control functions
New requirement that safety devices shall be 7.1 8.1  C2
used within their ratings
Removed option for manufacturer of equipment to 7.3 8.2  C11
identify missing safety devices with an "X" and
give details in a Specific Condition of Use
Moved away from term 'single fault tolerant' to 7.2 8.1  C12
focus on terms used in association with EPL Gb
or Db, "normal use and expected malfunctions.
Based on this, "pxb" has been clarified which
safety devices or control functions need to
consider 'expected malfunctions.
Added requirements that the instructions need to 7.2 8.2  C13
give information on the safety devices and control
functions, how to verify proper operation and that
verification is needed prior to putting pressurized
equipment into service.
Changed "safety device" to "control function" in Table 3 Table 5 x
many locations including table 5 to cover
pressurization control systems that incorporate a
chain of devices to support a control function
IEC CDV 60079-2 © IEC 2026
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Re-organized section to better capture details 7.4 8.3 x
applicable to all pressurization control systems
and those evaluated as Ex associated equipment.
Clarification that pressurized equipment shall be 8.3.1 x
supplied with a pressurization control system
Additional marking and instruction requirements
7.4.1 8.3.1  C14
for systems with a regulator that has a failure
7.4.2
mode that could cause the maximum pressure to
be exceeded
7.4.3
Clarification that for automatic systems that 8.3.2c X
manage purge time for pzc and pyb, the timer is a
8.3.3d
safety device
Incorporated the details on the functional 7.5 8.3.4 x
sequence diagram for "pxb" into the section on
"pxb" pressurization control systems
Added requirements for pressurization control 7.4 8.3.5  C15
systems evaluated as Ex associated equipment
that they require a "X" following of the certificate
number and additional information required
Identification that the purge requirements in old 7.7 8.4  C16
7.8, now 8.5 are part of the criteria. Additionally,
clarified what aspects need to be considered for
expected malfunctions
Table added to clarify Group I and Group II 7.8 8.5 x
purging criteria and changed requirements and
needed warning labels
Added information for pressurization control
7.8 8.5 x
systems that can manage purge time based on
total volume
Clarified in requirements and in warning text that 7.9 8.6  C17
after enclosure has been cleaned, pressurization
overpressure is required before power can be
applied
Clarification for "pxb" that control function needs 7.10 8.7  C18
to be appropriate for normal operation and
expected malfunctions
Clarification that flowmeters used to detect 7.11 8.8  C19
pressurization overpressure in pressurized
equipment shall be at the outlet of the pressurized
enclosure
Also clarified for "pxb" what needs to be
appropriate for normal operation and expected
malfunctions
Details on what the manufacturer needs to supply 7.12 8.9  C20
in the instructions, and pointing to the type test
for maximum overpressure test
Clarification that the initial enclosure and any 7.13 8.10 x
additional enclosures shall be purged before
connecting supply
Added requirements to either provide the 9.1 10.1  C21
alternate supply with the equipment or have
Specific Conditions of Use.
Combined old clauses 10 through 15 under single 10-15 11 x
clause to have a single section on pressurized
equipment with internal source of release
IEC CDV 60079-2 © IEC 2026
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Figure replaces part of Table 1. All details in table Table 1 Figure 2 x
1 that were involved with equipment that
contained a source of release now detailed in
Figure 2. The requirement for "pyb" when there is
an internal source of release of gas or vapor, the
external EPL required Gc and the pressurized
enclosure did not contain ICE has been reduced
to "pzc"
For pressurized equipment with containment 12.1 11.3.1  C22
systems, the instructions shall include the
maximum rate of process pressure change
Changes in wording for Specific Conditions of Use 12.3 11.3.3  C23
New Requirements for limiting flammable 11.3.4  C44
substance flow
New requirements for containment systems with a 11.3.5  C45
flame
Further details and considerations when liquids 13.1 11.4.1  C24
are released
Expanded the requirements 13.3.4 11.4.3.4  C25
Possible further documentation requirements 14 11.5  C26
Added requirement for alarm actuation 15 11.6  C27
Clarification on order of tests for Pressurized - 13.1  C28
enclosures and sample requirements
Added requirement to include any increase from 16.1 13.2  C29
limited normal release containment systems
Changes to criteria for passing overpressure test 16.2 13.3  C30
Added clarification on testing pressurized 13.6.1  C31
equipment using a pressurization control system
that can manage purge time based on total
volume
Clarification that the minimum purging time 16.4.2 13.6.2 x
specified by the manufacturer shall not be less
than the measured purge time
Additional considerations for equipment that has 16.6 13.8  C32
moving parts that can affect internal airflow
Change to pressure increase rate for 16.7.1 13.9.1  C33
overpressure test for containment systems
Added type tests for pressurization control 13.11  C34
systems
Added requirement where the warnings shall be 18.1 15.9  C35
placed on the pressurized equipment
Added new requirements for marking of 15.3  C46
pressurized equipment that uses pressurization
15.10
controllers that are evaluated as Ex associated
equipment and provided examples.
added new requirement for start-up and operation 18.3 15.3  C36
instructions of the pressurization control system
Added restriction marking for no additional 18.4 15.4  C37
oxidizers
Clarified and add marking requirements for 18.6 15.6  C38
pressurization control systems evaluated as Ex
associated equipment
IEC CDV 60079-2 © IEC 2026
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
New marking for systems that contain flammable 15.8  C39
substance
Added new section for documentation (schedule - 16  C40
drawings) with specific requirements
Added needed references and new requirements 19 1  C41
to instruction section and further details of what
needs to be included in the instructions
Annex A moved to type test section Annex A 13.5 x
Clarification of Figure F.1 through Figure F.3 Annex F Annex F x
Extensions and Further requirement details i
...