prEN IEC 60079-2:2024
(Main)Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p"
Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p"
Explosionsgefährdete Bereiche - Teil 2: Geräteschutz durch Überdruckkapselung "p"
Atmosphères explosives - Partie 2: Protection de l’appareil par enveloppe à surpression interne "p"
Eksplozivne atmosfere - 2. del: Zaščita opreme z nadtlakom "p"
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2024
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 60079-2:2024
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.
31/1764/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-2 ED7
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-04-05 2024-06-28
SUPERSEDES DOCUMENTS:
31/1750/RR
IEC TC 31 : EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
SECRETARIAT: SECRETARY:
United Kingdom Mr Tom Stack
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, 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 online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses
to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC
clauses. (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:
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, or any part of it, for any other purpose without
permission in writing from IEC.
31/1764/CDV – 2 – IEC CDV 60079-2 © IEC:2024
1 CONTENTS
3 FOREWORD . 7
4 INTRODUCTION . 15
5 1 Scope . 16
6 2 Normative references . 23
7 3 Terms and definitions . 23
8 4 Levels of Protection . 26
9 5 Constructional requirements for pressurized enclosures . 29
10 5.1 Enclosure . 29
11 5.1.1 General . 29
12 5.1.2 Incorporating EPL Gc Ex Equipment or Ex Components . 29
13 5.2 Materials . 29
14 5.3 Doors and covers . 29
15 5.3.1 General . 29
16 5.3.2 Group I pressurized enclosures . 30
17 5.3.3 Group I pressurized enclosures with static pressurization . 30
18 5.3.4 Group II and Group III pressurized enclosures . 30
19 5.3.5 Group II and Group III pressurized enclosures with static pressurization. 30
20 5.3.6 Group II and Group III Level of Protection “pxb” . 30
21 5.3.7 Group II and Group III door and cover warning . 30
22 5.4 Mechanical strength . 30
23 6 Constructional requirements for pressurized equipment . 31
24 6.1 Group I and Group II Apertures, and partitions . 31
25 6.2 Group I and Group II Internal components, compartments, and enclosures . 31
26 6.3 Apertures for Static Pressurization . 31
27 6.4 Insulating materials for Group I equipment . 32
28 6.5 Spark and particle barriers . 32
29 6.6 Thermal protection sensors of electric machines . 32
30 6.7 Bypass or Override function . 32
31 7 Temperature limits . 33
32 7.1 General . 33
33 7.2 For Level of Protection “pxb” or Level of Protection “pyb” . 33
34 7.3 For Level of Protection “pzc” . 34
35 8 Safety devices and safety control functions of pressurization control systems
36 (except for static pressurization) . 34
37 8.1 General . 34
38 8.2 Provider of safety devices . 35
39 8.3 Pressurization Control Systems . 36
40 8.3.1 General . 36
41 8.3.2 For Level of Protection “pzc”. . 36
42 8.3.3 For Level of Protection “pyb”. . 36
43 8.3.4 For Level of Protection “pxb”. . 37
44 8.3.5 Evaluated as Ex associated equipment . 37
45 8.4 Group I and Group II Purging for Level of Protection “pxb” . 37
46 8.5 Group I or Group II − Purging criteria . 38
IEC CDV 60079-2 © IEC:2024 – 3 – 31/1764/CDV
47 8.6 Group III – Cleaning . 39
48 8.7 Requirements when a minimum flow rate required . 39
49 8.8 Safety devices to detect minimum pressurization overpressure . 39
50 8.9 Value of pressurization overpressure and maximum overpressure . 40
51 8.10 Pressurizing multiple enclosures . 41
52 8.11 Safety devices on doors and covers . 41
53 8.12 Equipment that may remain energized . 41
54 8.13 Equipment permitted within Level of Protection “pyb” . 41
55 9 Safety provisions and safety devices for static pressurization . 42
56 9.1 Suitability of safety devices for hazardous area . 42
57 9.2 Protective gas . 42
58 9.3 Internal sources of release . 42
59 9.4 Group I and Group II Filling procedure . 42
60 9.5 Group III Filling Procedure . 42
61 9.6 Safety devices . 42
62 9.7 Equipment that may remain energized . 42
63 9.8 Overpressure . 42
64 10 Supply of protective gas . 43
65 10.1 Backup supply . 43
66 10.2 Independent supplies . 43
67 10.3 Type of gas . 43
68 10.4 Temperature . 43
69 11 Pressurized equipment with an internal source of release . 44
70 11.1 General . 44
71 11.2 Release conditions . 46
72 11.2.1 No release . 46
73 11.2.2 Limited release of a gas or vapour . 46
74 11.2.3 Limited release of a liquid . 46
75 11.3 Design requirements for the containment system . 46
76 11.3.1 General design requirements . 46
77 11.3.2 Infallible containment system . 47
78 11.3.3 Containment system with a limited release . 47
79 11.4 Protective gas and pressurizing techniques when there is an internal source
80 of release. 48
81 11.4.1 General . 48
82 11.4.2 Pressurization with leakage compensation . 48
83 11.4.3 Pressurization with dilution flow . 49
84 11.5 Equipment in dilution volume . 49
85 11.6 Internal hot surfaces . 50
86 12 Cells and batteries within pressurized equipment. . 50
87 12.1 General Requirements . 50
88 12.2 Cells or Battery used for memory backup applications . 51
89 12.3 Other cell and battery types . 51
90 12.4 Cell and Battery Related Warnings . 51
91 12.4.1 General . 51
92 12.4.2 Relevant to EPL Mb, Gb or Db without other protection . 51
93 12.4.3 Relevant to EPL Gc or Dc without other protection . 51
94 12.4.4 Otherwise protected . 52
95 13 Type Verification and Tests . 52
31/1764/CDV – 4 – IEC CDV 60079-2 © IEC:2024
96 13.1 General . 52
97 13.2 Determining the maximum overpressure rating . 52
98 13.3 Maximum overpressure test . 52
99 13.4 Leakage test . 52
100 13.4.1 Other than static pressurization . 52
101 13.4.2 Static pressurization . 53
102 13.5 Purging and dilution flow tests . 53
103 13.5.1 General . 53
104 13.5.2 Criteria for compliance where the protective gas is air . 53
105 13.5.3 Criteria for compliance where the protective gas is inert . 54
106 13.6 Purging test for pressurized equipment with no internal source of release
107 and filling procedure test for static pressurization . 54
108 13.6.1 General . 54
109 13.6.2 Pressurized equipment where the protective gas is air . 54
110 13.6.3 Pressurized equipment where the protective gas is inert . 54
111 13.6.4 Pressurized equipment where the protective gas may be either air or an
112 inert gas with a density equal to air 10 % . 54
113 13.6.5 Filling procedure test for a pressurized equipment protected by static
114 pressurization . 54
115 13.7 Purging and dilution flow tests for a pressurized equipment with an internal
116 source of release . 55
117 13.7.1 Test gas . 55
118 13.7.2 Pressurized equipment where the flammable substance has less than a
119 volume fraction of 2 % oxygen and the protective gas is inert . 55
120 13.7.3 Pressurized equipment with pressurization by continuous flow,
121 containment system with less than a volume fraction of 21 % oxygen
122 and the protective gas is inert . 55
123 13.7.4 Pressurized equipment where the flammable substance is not a liquid,
124 pressurization by continuous flow and the protective gas is air . 56
125 13.8 Verification of minimum pressurization overpressure . 57
126 13.9 Tests for an infallible containment system . 57
127 13.9.1 Overpressure test . 57
128 13.9.2 Infallibility test . 57
129 13.10 Overpressure test for a containment system with a limited release . 57
130 13.11 Pressurization Control Systems . 57
131 14 Routine tests . 58
132 14.1 Functional test . 58
133 14.2 Leakage test . 58
134 14.3 Tests for an infallible containment system . 58
135 14.4 Test for a containment system with a limited release . 58
136 15 Marking . 58
137 15.1 General . 58
138 15.2 Identifying as pressurized . 58
139 15.3 Supplementary marking . 58
140 15.4 Internal source of release . 59
141 15.5 Static pressurization . 59
142 15.6 Pressurization control systems evaluated as Ex associated equipment . 59
143 15.7 Inert gas . 60
144 15.8 Internal flammable substance . 60
145 15.9 Warning markings . 60
IEC CDV 60079-2 © IEC:2024 – 5 – 31/1764/CDV
146 16 Schedule Drawings . 61
147 17 Instructions . 61
148 Annex A (informative) Design considerations for pressurized equipment that have
149 containment systems where the flammable material is a liquid. 63
150 A.1 General . 63
151 A.2 Classification of material state . 63
152 A.3 Design recommendations . 63
153 A.3.1 Flashing liquids . 63
154 A.3.2 Pooling liquids . 63
155 A.3.3 Leak Detection . 63
156 A.3.4 Isolation of flammable lines . 64
157 A.3.5 Drain & vent connections . 64
158 A.3.6 Flame detectors . 64
159 A.4 Dilution vs leakage compensation . 64
160 Annex B (informative) Examples of functional sequence diagram . 65
161 B.1 Information to User . 65
162 Annex C (Informative) Examples of the changes in pressure in ducts and enclosures . 67
163 Annex D (informative) Information to be provided to the user . 72
164 D.1 General . 72
165 D.2 Ducting of protective gas . 72
166 D.2.1 Location of inlet . 72
167 D.2.2 Ducting between pressurized equipment and inlet . 72
168 D.2.3 Outlets for protective gas . 72
169 D.2.4 Additional purge time to account for ducting . 73
170 D.2.5 Temperature of protective gas at the inlet . 73
171 D.3 Power for protective gas supply . 73
172 D.4 Static pressurization . 73
173 D.5 Pressurized Equipment with a containment system . 73
174 D.6 Pressurized Equipment maximum overpressure . 73
175 Annex E (normative) Classification of the type of release within pressurized
176 equipment . 74
177 E.1 General . 74
178 E.2 No normal release, no abnormal release . 74
179 E.3 No normal release, limited abnormal release . 74
180 E.4 Limited normal release . 74
181 Annex F (informative) Examples for the use of the dilution volume concept . 76
182 Annex G . 78
183 Bibliography . 81
185 Figure 1 – Determination of Level of Protection . 27
186 Figure 2 - Determination of protection level and protective gas for equipment with
187 internal release . 45
188 Figure B.1 – State diagram of a leakage-compensation pressurization control system . 66
189 Figure C.1 – Protective gas outlet . 68
190 Figure C.2 – Pressurized enclosures with leakage compensation, enclosures without
191 moving parts . 69
192 Figure C.3 – Pressurized enclosures with leakage compensation, rotating electric
193 machine with an internal cooling fan . 70
31/1764/CDV – 6 – IEC CDV 60079-2 © IEC:2024
194 Figure C.4 – Pressurized enclosure with a leakage compensation, rotating electric
195 machine with an external cooling fan . 71
196 Figure F.1 – Diagram showing the use of the dilution volume concept to simplify the
197 purge and dilution flow test requirements . 76
198 Figure F.2 – Diagram showing the use of the infallible containment system concept to
199 simplify the purging and dilution flow requirements around ICE . 77
200 Figure F.3 – Diagram showing the use of internal partitions around the potential source
201 of release to simplify the purging and dilution flow requirements around ICE located
202 outside the partitions . 77
203 Figure B.1 – State diagram of a leakage-compensation pressurization control system
204 Figure C.1 – Protective gas outlet . …
205 Figure C.2 – Pressurized enclosures with leakage compensation, enclosures without
206 moving parts . .
207 Figure C.3 – Pressurized enclosures with leakage compensation, rotating electric
208 machine with an internal cooling fan . ….
209 Figure C.4 – Pressurized enclosure with a leakage compensation, rotating electric
210 machine with an external cooling fan . .
211 Figure F.1 – Diagram showing the use of the dilution volume concept to simplify the
212 purge and dilution flow test requirements .
213 Figure F.2 – Diagram showing the use of the infallible containment system concept to
214 simplify the purging and dilution flow requirements around ICE .
215 Figure F.3 – Diagram showing the use of internal partitions around the potential source
216 of release to simplify the purging and dilution flow requirements around ICE located
217 outside the partitions .
219 Table 1 - Applicability of specific clauses of IEC 60079-0 . 16
220 Table 2 - Design criteria based upon Level of Protection. 28
221 Table 3 – Internal volumes that do not require purging. . 31
222 Table 4 – Conditions for the determination of maximum surface temperature in electric
223 machines . 33
224 Table 5 – Control functions based upon Level of Protection . 35
225 Table 6 - Purging test requirements . 38
226 Table 7 – Equipment Protection Levels permitted within the dilution volume based
227 upon the Level of Protection of the pressurized equipment . 50
228 Table 8 – Text of warning markings . 60
229 Table B.1 – Truth table of a leakage-compensation purge control system . 65
230 Table G.1 – Example of evaluation of pressurization control system elements for
231 control function .
IEC CDV 60079-2 © IEC:2024 – 7 – 31/1764/CDV
235 INTERNATIONAL ELECTROTECHNICAL COMMISSION
236 ____________
238 EXPLOSIVE ATMOSPHERES –
240 Part 2: Equipment protection by pressurization “p”
244 FOREWORD
245 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
246 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
247 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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253 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
254 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
255 consensus of opinion on the relevant subjects since each technical committee has representation from all
256 interested IEC National Committees.
257 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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260 misinterpretation by any end user.
261 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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263 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
264 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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267 6) All users should ensure that they have the latest edition of this publication.
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271 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
272 Publications.
273 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
274 indispensable for the correct application of this publication.
275 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
276 rights. IEC shall not be held responsible for identifying any or all such patent rights.
277 IEC 60079-2 has been prepared by maintenance team MT60079-2: Maintenance of IEC 60079-
278 2, of IEC technical committee 31: Explosive atmospheres. It is an International Standard.
279 This seventh edition cancels and replaces the sixth edition published in 2014, This edition
280 constitutes a technical revision.
281 Users of this document are advised that interpretation sheets clarifying the interpretation of this
282 document can be published. Interpretation sheets are available from the IEC webstore and can
283 be found in the “history” tab of the page for each document.
284 This edition includes the following significant technical changes with respect to the previous
285 edition:
31/1764/CDV – 8 – IEC CDV 60079-2 © IEC:2024
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Clarification in scope that use of gas detection to eliminate 1 1 x
purging is not within the scope of the document.
Added correlation table to 60079-0 1 x
Clarification in scope that other oxidizers present in flammable 1 1 x
material are not covered
Changed term dilution to dilution flow 3.3 3.3 x
Changed term dilution area to dilution volume 3.3 3.4 x
Added definition for diluted volume 3.5
Update to term hermetically sealed device to align with others 3.7 3.8 x
Clarification of what ignition-capable equipment (ICE) is 3.8 3.9 x
Added definition for pressurization overpressure - 3.13.1 x
Added definition for maximum overpressure - 3.13.2 x
Clarified definition for pressurization control system 3.14 3.15 x
Added definition for pressurized equipment - 3.17 x
Clarification in definition for purging that it applies to the 3.18 3.20 x
pressurized equipment
Various locations clarified based on newly defined terms Whole x
document
Replaced Table 1 and Table 4 with Figure 1 and Figure 2 4 &13.1 4 &11.1 x
Clarification that nR is not permitted for EPL Gc on “pyb” 4 4 C1
equipment.
Direction on enclosure requirements for “pyb” and “pzc” when - 5.1.2 C2
IP54 enclosure is required for EPL Gc equipment used
Addition of information for instructions about doors or covers 5.3.1 C3
Moved text found previously in section 5.3.3 about doors opening 5.3.3 5.3 x for C4 for
violently to a general location in 5.3 so it applies to all Groups. Group II Group I
and III
Addition of a warning on the enclosure of “pxb” that requires 5.3.5 5.3.6 C5
cool-down period
Clarification that safety device if overpressure can occur that 5.4 5.4 x
would cause deformation of enclosure needs to comply with
8.3.1.
Separated part of the clause into new a clause for items that
5.5 to 5.10 6 x
pertain the pressurized equipment, not just the pressurized
enclosure
Added equivalent geometries for vents of internal compartments
5.5.2 6.2 x
as well as clarified and extended volumes that do not need
purged
Clarified that the section on sealing was relevant to conduit and 5.8 13.1 x
cable for sealing at installation. Moved to testing section and
instruction section.
Modified the Specific Condition of Use that if the spark and 5.9 6.5 C6
particle barrier is not included that the protective vent shall
discharge to a non-hazardous area only
Added new section for electric machines 6.6 C7
Added new section for bypass or override function 6.7 C8
Moved detail that originally only applied to “pzc” so it would apply 6.3 7.1 C9
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
energized
IEC CDV 60079-2 © IEC:2024 – 9 – 31/1764/CDV
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Added new requirements for determining maximum surface 6.2 7.2 C10
temperatures of electric machines in “pxb” and “pyb” including a
new table
Added further details in table to better capture safety devices Table 3 Table 5 x
Removed option for manufacturer of equipment to identify 7.3 8.2 C11
missing safety devices with an “X” and give details in a Specific
Condition of Use
Moved away from term ‘single fault tolerant’ to focus on terms 7.2 8.1 C12
used in association with EPL Gb/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 give 7.2 8.2 C13
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 many locations Table 3 Table 5 x
including table 5 to cover pressurization control systems that
incorporate a chain of devices to support a safety function
Re-organized section to better capture details applicable to all 7.4 8.3 x
pressurization control systems and those certified as Ex
associated equipment.
Clarification that pressurized equipment shall be supplied with a 8.3.1 x
pressurization control system
Additional marking and instruction requirements for systems with 7.4.1 8.3.1 C14
a regulator that has a failure mode that could cause the
7.4.2
maximum pressure to be exceeded
7.4.3
Incorporated the details on the functional sequence diagram for 7.5 8.3.4 x
“pxb” into the section on “pxb” pressurization control systems
Added requirements for pressurization control systems evaluated 7.4 8.3.5 C15
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 7.8, now 8.5 are 7.7 8.4 C16
part of the criteria. Additionally, clarified what aspects need to be
considered for expected malfunctions
Table added to clarify Group I and Group II purging criteria and 7.8 8.5 x
changed requirements and needed warning labels
Added information for pressurization control systems that can 7.8 8.5 x
manage purge time based on total volume
Clarified in requirements and in warning text that after enclosure 7.9 8.6 C17
has been cleaned, pressurization overpressure is required before
power can be applied
Clarification for “pxb” that control function needs to be 7.10 8.7 C18
appropriate for normal operation and expected malfunctions
Clarification that flowmeters used to detect pressurization 7.11 8.8 C19
overpressure in pressurized equipment shall be at the outlet of
the pressurized enclosure unless there are additional provisions.
Also clarified for “pxb” what needs to be appropriate for normal
operation and expected malfunctions
Details on what the manufacturer needs to supply in the 7.12 8.9 C20
instructions, and pointing to the type test for maximum
overpressure test
Clarification that the initial enclosure and any additional 7.13 8.10 x
enclosures shall be purged before connecting supply
Added requirements to either provide the alternate supply with 9.1 10.1 C21
the equipment or have Specific Conditions of Use.
31/1764/CDV – 10 – IEC CDV 60079-2 © IEC:2024
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Combined old clauses 10 through 15 under single clause to have 10-15 11 x
a single section on pressurized equipment with internal source of
release
Figure replaces part of table 1. All details in table 1 that were Table 1 Figure 2 x
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 systems, the 12.1 11.3.1 C22
instructions shall include the maximum rate of process pressure
change
Changes in wording for Specific Conditions of Use 12.3 11.3.3 C23
Further details and considerations when liquids are released 13.1 11.4.1 C24
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 enclosures and - 13.1 C28
sample requirements
Added requirement to include any increase from limited normal 16.1 13.2 C29
release containment systems
Changes to criteria for passing overpressure test 16.2 13.3 C30
Added clarification on testing pressurized equipment using a 13.6.1 C31
pressurization control system that can manage purge time based
on total volume
Clarification that the minimum purging time specified by the 16.4.2 13.6.2 x
manufacturer shall not be less than the measured purge time
Additional considerations for equipment that has moving parts 16.6 13.8 C32
that can affect internal airflow
Change to pressure increase rate for overpressure test for 16.7.1 13.9.1 C33
containment systems
Added type tests for pressurization control systems 13.11 C34
Added requirement where the warnings shall be placed on the 18.1 15.9 C35
pressurized equipment
added new requirement for start-up and operation instructions of 18.3 15.3 C36
the pressurization control system
Added restriction marking for no additional oxidizers 18.4 15.4 C37
Clarified and add marking requirements for pressurization control 18.6 15.6 C38
systems evaluated as Ex associated equipment
New marking for systems that contain flammable substance 15.8 C39
Added new section for documentation (schedule drawings) with - 16 C40
specific requirements
Added needed references and new requirements to instruction 19 17 C41
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 in E.3 and E.4 Annex E Annex E x C42
Cell and battery requirements updated Annex G/H 12 C43
Annex A – informative annex for containment systems with liquid - Annex A x
IEC CDV 60079-2 © IEC:2024 – 11 – 31/1764/CDV
Type
Changes Clause in Clause in Minor and Extension Major
th th
6 edition 7 edition Editorial Technical
Changes Changes
Annex G – new – informative guidance on evaluation of safety Annex G x
control functions
287 Explanations:
288 A) Definitions
289 Minor and editorial changes clarification decrease of technical requirements minor
290 technical change editorial corrections
291 These are changes which modify requirements in an editorial or a minor technic
...
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