prEN ISO/IEC 80079-41
(Main)Explosive atmospheres - Part 41: Reciprocating internal combustion engines (ISO/IEC DIS 80079-41:2025)
Explosive atmospheres - Part 41: Reciprocating internal combustion engines (ISO/IEC DIS 80079-41:2025)
This part of ISO/IEC 80079 specifies the technical requirements for design, construction, conversion, testing, marking and the information required for use to avoid or minimise the possibility of ignition which could from reciprocating internal combustion engine intended for use in explosive atmospheres including:
– Group I EPL Mb for use in underground workings susceptible to firedamp or combustible dust,
– Group II EPL Gb and EPL Gc for use in explosive atmospheres of flammable gas and vapour, and
– Group III EPL Db and EPL Dc for use in explosive atmospheres of combustible dust.
– For EPL Gc and Dc engines, only normal operating conditions need to be taken into account. Malfunctions need not be considered (see B.2.1).
This document includes those tests of the engine and its ancillary devices that are required to verify compliance with this document.
This document applies to both reciprocating internal combustion engines with compression ignition for EPL Mb, Gb, Gc, Db, Dc and gaseous fuelled spark ignition engines for EPL Gc. See Annex G.
This document does not define requirements relating to the driven machinery and equipment.
This document does not apply to
– explosive mixtures of vapours and gases, which tend to self-decompose (for example carbon disulphide (CS2), ethylene oxide (C2H4O), acetylene (C2H2)) or which are chemically unstable;
• hydrogen fueled engines, including blends;
• engines used in areas for the processing, manufacture or storage of explosives;
• gasoline and other spark ignited engines where the fuel is injected into the combustion chamber as a liquid; or
• electrical ignition spark systems.
Note 1 Spark ignition systems used with equipment covered by ISO/IEC 80079-41 is covered by IEC 60079-45
This document solely deals with explosion protection requirements. Requirements on gaseous or particulate exhaust emissions are not covered by this standard.
General safety requirements are not included in this International Standard.
This document does not specify requirements for safety, other than those directly related to the possibility of ignition of flammable mixtures in the surrounding atmosphere which can lead to an explosion.
The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it can be assumed that the engine may be operated are:
• temperature –20 °C to +60 °C
• pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and
• air with normal oxygen content, typically 21% v/v.
An engine for use outside of the standard atmospheric conditions is to be designed, constructed tested and marked for those conditions. The ignition hazard assessment, ignition, protection provided, additional testing (if necessary) manufacturer’s technical documentation and instructions to the user are intended toclearly demonstrate the engine’s suitability for the conditions.
NOTE 2 changes in temperature and pressure have an influence on the characteristics of the explosive atmosphere including ignitability
NOTE 3 IEC TS 60079-43 gives information for equipment used in explosive atmospheres in environmental conditions which include ambient temperatures below –20 °C and additional adverse conditions, including maritime applications.
NOTE 4 Reciprocating internal combustion engines are not considered as pressure vessels.
This document supplements and modifies the general requirements of IEC 60079-0:2017 and ISO 80079-36. Where a requirement of this document conflicts with a requirement of IEC 60079-0:2017 and ISO 80079-36 as far as applicable for Ex engines, the requirement of this standard takes precedence.
NOTE 5 On-going inspection, maintenance and repair aspects play an important role in control of hazardous area installations and the user’s attention is drawn to IEC 60079-17, IEC 60079-19 and IEC 60079-14 and manufacturer’s instructions for further information concerning these aspects.
Explosionsfähige Atmosphären - Teil 41: Hubkolben-Verbrennungsmotoren (ISO/IEC DIS 80079:41:2025)
Atmosphères explosives - Partie 41: Moteurs alternatifs à combustion interne (ISO/IEC DIS 80079-41:2025)
Eksplozivne atmosfere - 41. del: Batni motorji z notranjim zgorevanjem (ISO/IEC DIS 80079:41:2025)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Eksplozivne atmosfere - 41. del: Batni motorji z notranjim zgorevanjem (ISO/IEC
DIS 80079:41:2025)
Explosive atmospheres - Part 41: Reciprocating internal combustion engines (ISO/IEC
DIS 80079-41:2025)
Explosionsfähige Atmosphären - Teil 41: Hubkolben-Verbrennungsmotoren (ISO/IEC
DIS 80079:41:2025)
Atmosphères explosives - Partie 41: Moteurs alternatifs à combustion interne (ISO/IEC
DIS 80079-41:2025)
Ta slovenski standard je istoveten z: prEN ISO/IEC 80079-41
ICS:
27.020 Motorji z notranjim Internal combustion engines
zgorevanjem
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.
DRAFT
International
Standard
ISO/IEC
DIS
80079-41
ISO/TMBG
Explosive atmospheres —
Secretariat: ISO
Part 41:
Voting begins on:
Reciprocating internal combustion 2025-04-04
engines
Voting terminates on:
2025-06-27
Atmosphères explosives —
Partie 41: Moteurs alternatifs à combustion interne
ICS: 29.260.20; 27.020
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Reference number
© ISO/IEC 2025
ISO/IEC DIS 80079-41:2025(en)
DRAFT
ISO/IEC DIS 80079-41:2025(en)
International
Standard
ISO/IEC
DIS
80079-41
ISO/TMBG
Explosive atmospheres —
Secretariat: ISO
Part 41:
Voting begins on:
Reciprocating internal combustion
2025-04-04
engines
Voting terminates on:
2025-06-27
Atmosphères explosives —
Partie 41: Moteurs alternatifs à combustion interne
ICS: ISO ics
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
This document is circulated as received from the committee secretariat.
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This draft is submitted to a parallel vote in ISO and in IEC.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO/IEC 2025
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Published in Switzerland Reference number
© ISO/IEC 2025
ISO/IEC DIS 80079-41:2025(en)
© ISO/IEC 2025 – All rights reserved
ii
ISO/IEC DIS 80079-41:2025(en)
31M/252/CDV 2 ISO/IEC 80079-41 ED1 © ISO/IEC 2025
2 INTERNATIONAL ELECTROTECHNICAL COMMISSION
3 ____________
5 EXPLOSIVE ATMOSPHERES –
7 Part 41: Reciprocating internal combustion engines
9 FOREWORD
10 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
11 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
12 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
13 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
14 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
15 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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17 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
18 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
19 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
20 consensus of opinion on the relevant subjects since each technical committee has representation from all
21 interested IEC National Committees.
22 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
23 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
24 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
25 misinterpretation by any end user.
26 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
27 transparently to the maximum extent possible in their national and regional publications. Any divergence between
28 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
29 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
30 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
31 services carried out by independent certification bodies.
32 6) All users should ensure that they have the latest edition of this publication.
33 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
34 members of its technical committees and IEC National Committees for any personal injury, property damage or
35 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
36 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
37 Publications.
38 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
39 indispensable for the correct application of this publication.
40 9) IEC and ISO draw attention to the possibility that the implementation of this document may involve the use of (a)
41 patent(s). IEC and ISO take no position concerning the evidence, validity or applicability of any claimed patent
42 rights in respect thereof. As of the date of publication of this document, IEC and ISO had not received notice of
43 (a) patent(s), which may be required to implement this document. However, implementers are cautioned that this
44 may not represent the latest information, which may be obtained from the patent database available at
45 https://patents.iec.ch and www.iso.org/patents. IEC and ISO shall not be held responsible for identifying any or
46 all such patent rights.
47 ISO/IEC 80079-41 has been prepared by ISO/IEC subcommittee 31M: Non-electrical equipment
48 and protective systems for explosive atmospheres, of IEC technical committee XX: Equipment
49 for explosive atmospheres. It is an International Standard.
50 It is published as a double logo International Standard.
51 The text of this International Standard is based on the following documents of IEC:
FDIS Report on voting
31M/XX/FDIS 31M/XX/RVD
[Type here]
© ISO/IEC 2025 – All rights reserved
ISO/IEC DIS 80079-41:2025(en)
ISO/IEC 80079-41 ED1 © ISO/IEC 2025 3 31M/252/CDV
53 Full information on the voting for its approval can be found in the report on voting indicated in
54 the above table. In ISO, the document was approved by XXX P members out of YYY having
55 cast a vote.
56 The language used for the development of this International Standard is English.
57 A list of all parts in the ISO/IEC 80079 series, published under the general title Explosive
58 atmospheres, can be found on the IEC website.
59 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
60 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
61 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
62 described in greater detail at www.iec.ch/publications.
63 The committee has decided that the contents of this document will remain unchanged until the
64 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
65 specific document. At this date, the document will be
66 • reconfirmed,
67 • withdrawn,
68 • replaced by a revised edition, or
69 • amended.
© ISO/IEC 2025 – All rights reserved
ISO/IEC DIS 80079-41:2025(en)
31M/252/CDV 4 ISO/IEC 80079-41 ED1 © ISO/IEC 2025
72 EXPLOSIVE ATMOSPHERES –
74 Part 41: Reciprocating internal combustion engines
78 1 Scope
79 This part of ISO/IEC 80079 specifies the technical requirements for design, construction,
80 conversion, testing, marking, and the information required for use to avoid or minimise the
81 possibility of ignition which could result from a from reciprocating internal combustion engine
82 intended for use in explosive atmospheres including:
83 – Group I EPL Mb for use in underground workings susceptible to firedamp or combustible
84 dust,
85 – Group II EPL Gb and EPL Gc for use in explosive atmospheres of flammable gas and
86 vapour, and
87 – Group III EPL Db and EPL Dc for use in explosive atmospheres of combustible dust.
88 – For EPL Gc and Dc engines, only normal operating conditions need to be considered.
89 Malfunctions need not be considered (see B.2.1).
90 This document includes those tests of the engine and its ancillary devices that are required to
91 verify compliance with this document.
92 This document applies to reciprocating internal combustion engines with compression ignition
93 for EPL Mb, Gb, Gc, Db, Dc and gaseous fuelled spark ignition engines for EPL Gc. See
94 Annex G.
95 This document does not define requirements relating to the driven machinery and equipment.
96 This document does not apply to
97 • explosive mixtures of vapours and gases, which tend to self-decompose (for example
98 carbon disulphide (CS2), ethylene oxide (C2H4O), acetylene (C2H2)) or which are
99 chemically unstable;
100 • hydrogen fuelled engines, including blends;
101 • engines used in areas for the processing, manufacture or storage of explosives;
102 • gasoline and other spark ignited engines where the fuel is injected into the combustion
103 chamber as a liquid; or
104 • electrical ignition spark systems.
105 Note 1 Spark ignition systems used with equipment covered by ISO/IEC 80079-41 is covered by IEC 60079-45
106 This document solely deals with explosion protection requirements. Requirements on gaseous
107 or particulate exhaust emissions are not covered by this standard.
108 General safety requirements are not included in this International Standard.
109 NOTE 1 General safety requirements are covered for the EU in EN 1679-1:1998+A1:2011.
110 This document does not specify requirements for safety, other than those directly related to the
111 possibility of ignition of flammable mixtures in the surrounding atmosphere which can lead to
112 an explosion.
[Type here]
© ISO/IEC 2025 – All rights reserved
ISO/IEC DIS 80079-41:2025(en)
ISO/IEC 80079-41 ED1 © ISO/IEC 2025 5 31M/252/CDV
113 This document supplements and modifies the general requirements of IEC 60079-0 and
114 ISO 80079-36. Where a requirement of this document conflicts with a requirement of
115 IEC 60079-0 and ISO 80079-36 as is applicable for Ex engines, the requirement of this standard
116 takes precedence.
117 The standard atmospheric conditions (relating to the explosion characteristics of the
118 atmosphere) under which it may be assumed that the engine can be operated are:
119 • temperature –20 °C to +60 °C
120 • pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and
121 • air with normal oxygen content, typically 21% v/v.
122 Additional consideration and additional testing may be required for Ex engines operating outside the standard
123 atmospheric conditions.The ignition hazard assessment, ignition, protection provided, additional testing, (if
124 necessary) manufacturer’s technical documentation and instructions to the user are intended to clearly demonstrate
125 the engine’s suitability for the conditions. NOTE 2 Changes in temperature and pressure have an influence on the
126 characteristics of the explosive atmosphere including ignitability
127 NOTE 3 IEC TS 60079-43 gives information for equipment used in explosive atmospheres in environmental
128 conditions which include ambient temperatures below –20 °C and additional adverse conditions, including maritime
129 applications.
130 NOTE 4 Reciprocating internal combustion engines are not considered as pressure vessels.
131 NOTE 5 On-going inspection, maintenance and repair aspects play an important role in control of hazardous area
132 installations and the user’s attention is drawn to IEC 60079-17, IEC 60079-19 and IEC 60079-14 and manufacturer’s
133 instructions for further information concerning th
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