EN ISO/IEC 80079-38:2016

SLOVENSKI STANDARD
01-april-2017
1DGRPHãþD
SIST EN 1710:2006+A1:2008
SIST EN 1710:2006+A1:2008/AC:2010
Eksplozivne atmosfere - 38. del: Oprema in komponente, namenjene za uporabo v
eksplozivnih atmosferah v podzemnih rudnikih (ISO/IEC 80079-38:2016)
Explosive atmospheres - Part 38: Equipment and components in explosive atmospheres
in underground mines (ISO/IEC 80079-38:2016)
Explosionsfähige Atmosphären - Teil 38: Geräte und Komponenten in explosionsfähigen
Atmosphären in untertägigen Bergwerken (ISO/IEC 80079-38:2016)
Atmosphères explosives - Partie 38: Appareils et composants destinés à être utilisés
dans les mines souterraines grisouteuses (ISO/IEC 80079-38:2016)
Ta slovenski standard je istoveten z: EN ISO/IEC 80079-38:2016
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
73.100.30 Oprema za vrtanje in Equipment for drilling and
izkopavanje mine excavation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO/IEC 80079-38
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2016
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 1710:2005+A1:2008
English Version
Explosive atmospheres - Part 38: Equipment and
components in explosive atmospheres in underground
mines (ISO/IEC 80079-38:2016)
Atmosphères explosives - Partie 38: Appareils et Explosionsfähige Atmosphären - Teil 38: Geräte und
composants destinés à être utilisés dans les mines Komponenten in explosionsfähigen Atmosphären in
souterraines grisouteuses (ISO/IEC 80079-38:2016) untertägigen Bergwerken (ISO/IEC 80079-38:2016)
This European Standard was approved by CEN on 18 February 2016.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/IEC 80079-38:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/34/EU . 4
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC . 6
Annex ZC (informative) Significant technical changes between this document and the
previous edition of this European Standard . 7

European foreword
This document (EN ISO/IEC 80079-38:2016) has been prepared by subcommittee 31M: Nonelectrical
equipment and protective systems for explosive atmospheres, of IEC technical committee 31:
Equipment for explosive atmospheres" in collaboration with Technical Committee CEN/TC 305
“Potentially explosive atmospheres - Explosion prevention and protection” the secretariat of which is
held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2017, and conflicting national standards shall be
withdrawn at the latest by June 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
The significant changes with respect to EN 1710+A1:2008 are included in Annex ZC “Significant changes
between this European Standard and EN 1710+A1:2008".
This document supersedes EN 1710:2005+A1:2008.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s) 2014/34/EU
and 2006/42/EC.
For relationship with EU Directives, see informative Annex ZA and ZB, which are integral parts of this
document.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO/IEC 80079-38:2016 has been approved by CEN as EN ISO/IEC 80079-38:2016 without
any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/34/EU
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association to provide a means of conforming to Essential
Requirements of the New Approach Directive 2014/34/EU
Once this standard is cited in the Official Journal of the European Union under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the clauses of
this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption
of conformity with the corresponding Essential Requirements of that Directive and associated EFTA
regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 2014/34/EU
Clause(s)/sub-clause(s) of this Essential Requirements (ERs)
Qualifying remarks/Notes
EN of Directive 2014/34/EU
4; 5 1.0.1 EN ISO 80079-36
4; 5 1.0.2
6.2; 6.3 1.0.3
4.1; 5.1.2; 5.1.3 1.0.4 EN ISO 80079-36
8 1.0.5 EN ISO 80079-36
7.2 1.0.6
4; 4.1; 5.3 1.1.1 EN ISO 80079-36, EN 60079-0
4.1; 4.3; 5.4; 5.5; 5.6; 5.7; 5.9 1.1.2 EN ISO 80079-36, EN 60079-0,
IEC 60204-1
4.1 1.1.3 EN ISO 80079-36, EN 60079-0
4.1 1.2.1
4 1.2.4
4 1.2.5
7.1 1.2.6 EN ISO 80079-36, EN 60079-0
1; 4.4; 5.3.1.7; 5.8 1.2.7 a) EN 60204-1, EN 60204-11 and
standards supporting Directive

98/37/EC deal with this subject
1; 4.1; 4.2.3; 4.4.3.1; 5.4.2; 5.5; 1.2.7 b)
5.6; 5.7; 5.9; 6.1; C.8; C.9; C.10
1; 4.2; 6.2 1.2.7 c) EN ISO 80079-36
1; 4.4.3; 5.8 1.2.7 d)
4.1; 4.2; 4.3; 5.3.1.7; 5.4.1; 5.4.2; 1.2.8
Clause(s)/sub-clause(s) of this Essential Requirements (ERs)
Qualifying remarks/Notes
EN of Directive 2014/34/EU
5.4.6
4.3; 4.4 1.2.9 EN ISO 80079-36, EN 60079-1
1; 4.1; 4.2.3; 4.4.3.1; 5.1; 5.4.2; 1.3.1
5.4.3; 5.5; 5.6; 5.7; 6.1; 7.2
4.1; 4.4.6.2; 5.3.2; 5.4.1; 5.4.5; 1.3.2 EN ISO 80079-36, EN 60079-0
6.6; C.6
4.1; 4.4.6; C.4; C.5 1.3.3 EN 60204-1, EN 60204-11
5.3.1.7; 5.4.2 1.3.4 EN 60204-1, EN 60204-11
1.4.1 External effects are the subject
of agreement between the
manufacturer and user.
4.1 1.4.2 Resistance to chemical attack is
subject to agreement between
the manufacturer and user.
5.4.1; 5.7.1; 5.8 1.5.1 to 1.5.8 EN ISO 80079-37 and standards
supporting the use of Work
Equipment Directive
(95/63/EC)
5.4.1 1.6.1 to 1.6.5
1 (not applicable) 2.0.1
1; 4; 5 2.0.2 EN ISO 80079-36, EN 60079-0
1; 4; 5 2.0.2.1 EN ISO 80079-36, EN 60079-0
7.1 2.0.2.2
1 (not applicable ) 2.0.2.3
1 (not applicable) 2.1
1 (not applicable) 2.2
1 (not applicable ) 2.3
WARNING — Other requirements and other EU Directives may be applicable to the product(s)
falling within the scope of this standard.
Annex ZB
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association to provide a means of conforming to Essential
Requirements of the New Approach Directive 2006/42/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and
has been implemented as a national standard in at least one Member State, compliance with the
normative clauses of this standard confers, within the limits of the scope of this standard, a
presumption of conformity with Essential Requirement 1.5.7 of that Directive and associated EFTA
regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s)
falling within the scope of this standard.
Annex ZC
(informative)
Significant technical changes between this document and the previous
edition of this European Standard
This European Standard replaces EN 1710+A1:2008.
Table ZC.1 — Significant technical changes between this document and EN 1710+A1:2008
Significant changes Clause Type
Minor Extension Major
and technical
editorial changes
changes
Normative references updated,
especially references on CEN/CENELEC
and their publications changed into all clauses X
references on international available
publications
Terms and definitions has been
3  X
amended.
Ignition hazard assessment added
(Clauses related to mining equipment 4 X
adopted from ISO 80079-36)
Requirements for electric cable
4.4.6  X
configurations expanded
Requirements for impellers and
5.3.1.4  X
impeller rings expanded
Requirements for brakes added 5.7  X
Requirements for optical fibres used on
machines and electromagnetic radiation 5.9  X
from components on machines added
Requirements for hydraulic and
6.3  X
pneumatic equipment added
Requirements for cable-reeled
6.4  X
equipment expanded
Marking of equipment changed in
8  X
accordance with ISO 80079-36
Annex C „Ignition sources“ added Annex C  X
Annex D „Guidance on potential risks
Annex D  X
for converter-fed motors“added
Annex E „ Tests for surface protective
coating for group I hand tools of EPL Mb Annex E  X
“added
Explanations:
A) Definitions
Minor and editorial changes clarification
decrease of technical requirements
minor technical change
editorial corrections
Changes in a standard classified as ‘Minor and editorial changes’ refer to changes regarding the
previous standard, which modify requirements in an editorial or a minor technical way. Also changes of
the wording to clarify technical requirements without any technical change are classified as ‘Minor and
editorial changes’.
A reduction in level of existing requirement is also classified as ‘Minor and editorial changes’
Extension addition of technical options
Changes in a standard classified as ‘extension’ refers to changes regarding the previous standard, which
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 ‘extensions’ 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
Changes in a standard classified as ‘Major technical change’ refer to changes regarding the previous
standard, which add new or increase the level of existing technical requirements, in a way that a
product in conformity with the preceding standard will not always be able to fulfil the requirements
given in the standard. ‘Major technical changes’ have to be considered for products in conformity with
the preceding edition. For every change classified as ‘Major Technical Change’ additional information is
provided in clause B) of the Annex ZC.
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’
None
see also ATEX Guide 10.3 and Annex ZA
ISO/IEC 80079-38
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 38: Equipment and components in explosive atmospheres in underground

mines
Atmosphères explosives –
Partie 38: Appareils et composants destinés à être utilisés dans les mines

souterraines grisouteuses
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.230; 29.260.20 ISBN 978-2-8322-3180-7

– 2 – ISO/IEC 80079-38:2016
 ISO/IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references. 9
3 Terms, definitions and abbreviated terms . 10
4 Requirements for equipment (machines) and components . 14
4.1 General . 14
4.2 Ignition hazard assessment . 15
4.2.1 Formal analysis . 15
4.2.2 Assessment for equipment-group I, EPL Mb . 15
4.2.3 Establishing the maximum surface temperature . 15
4.2.4 Dust deposits and other material in the gap of moving parts . 15
4.2.5 Ignition hazard assessment report . 16
4.2.6 Ignition sources . 16
4.3 Non-electrical equipment and components . 16
4.4 Electrical equipment and components . 16
4.4.1 General . 16
4.4.2 Electrical equipment protection . 17
4.4.3 Over-current protection . 17
4.4.4 Earth-fault protection . 18
4.4.5 Mechanical protection of live parts . 19
4.4.6 Electric cables that are part of the equipment . 19
5 Additional requirements for specific equipment and components . 20
5.1 Cutting and stripping equipment . 20
5.1.1 General . 20
5.1.2 Machines with cutting picks . 20
5.1.3 Stripping machines . 21
5.2 Rope haulages for level and inclined transport . 21
5.3 Fans . 21
5.3.1 Ventilating fans for use in underground parts of mine . 21
5.3.2 Other fans . 23
5.4 Internal combustion engines . 23
5.5 Air compressors . 24
5.6 Drilling equipment and components . 24
5.7 Brakes . 25
5.7.1 Brakes used only for stopping in emergency . 25
5.7.2 Service brakes (including friction brakes and fluid based retarders) . 25
5.7.3 Parking brakes . 25
5.8 Traction batteries, starter batteries and vehicle lighting batteries . 25
5.9 Optical fibres used on machines and electromagnetic radiation from
components on machines . 26
5.9.1 External pipes/optical fibres . 26
5.9.2 Radio-frequency radiation from equipment . 26
5.10 Gas monitoring systems . 26
6 Fire protection . 27
6.1 General . 27

ISO/IEC 80079-38:2016 – 3 –
 ISO/IEC 2016
6.2 Non-metallic materials . 27
6.3 Hydraulic and pneumatic equipment . 27
6.4 Requirements for cable-reeled equipment . 29
6.4.1 General . 29
6.4.2 Special requirements . 29
6.5 Fire prevention on electric cables that are part of the machine . 29
6.6 Conveyor belting . 29
7 Information for use . 30
7.1 Signals and warning notices . 30
7.2 Instructions . 30
7.2.1 Information on use . 30
7.2.2 Information on maintenance and repair . 30
8 Marking . 30
Annex A (informative) Example of an ignition hazard assessment for a conveyor belt
intended for use in a coal mine. 32
A.1 General . 32
A.2 EPL and intended use of the equipment . 32
A.3 Construction and description of the equipment . 32
A.4 Assessment . 33
Annex B (informative) Example of an ignition hazard assessment for a shearer loader
intended for use in a potentially explosive atmosphere of a coal mine . 36
B.1 General . 36
B.2 EPL and intended use of equipment . 36
B.3 Construction/description of the equipment with regard to ignition protection . 36
B.4 Ignition control and monitoring system . 37
B.5 Compliance with the basic methodology and requirements in ISO 80079-36 . 37
B.6 Ignition hazard assessment of the electrical parts of the equipment . 38
B.7 Ignition hazard assessment of non-electrical ignition sources . 38
B.8 Equipment marking . 38
Annex C (normative) Ignition sources . 42
C.1 Hot surfaces . 42
C.2 Flames and hot gases (including hot particles) . 42
C.3 Mechanically generated sparks . 43
C.4 Electrical equipment . 43
C.5 Stray electric currents . 43
C.6 Static electricity. 44
C.7 Lightning . 44
4 12
C.8 Radio frequency (RF) electromagnetic waves from 10 Hz to 3 × 10 Hz
(high frequency) . 44
11 15
C.9 Electromagnetic waves from 3 × 10 Hz to 3 × 10 Hz . 45
C.10 Ionizing radiation . 45
C.11 Ultrasonics . 45
C.12 Adiabatic compression and shock waves . 45
C.13 Exothermic reactions, including self-ignition of dusts . 46
Annex D (informative) Guidance on potential risks for converter-fed motors . 47
Annex E (normative) Tests for surface protective coating for group I hand tools
of EPL Mb . 48
E.1 Incendive impact tests in explosive mixture . 48
E.1.1 Verification of ignition of the raw light alloy material . 48

– 4 – ISO/IEC 80079-38:2016
 ISO/IEC 2016
E.1.2 Estimation of protective coating efficiency . 48
E.1.3 Evaluation of results . 49
E.2 Adhesion test of the protective coating . 49
Bibliography . 51

Figure B.1 – Layout and construction of the coal face shearer loader . 37
Figure E.1 – Rig for impact ignition test . 50

Table 1 – Combination of materials . 23
Table 2 – Limit values for hydraulic fluids . 28
Table A.1 – Example of an ignition hazard assessment for a mining conveyor, EPL Mb
(1 of 2) . 33
Table B.1 – Example of an ignition hazard assessment for a shearer loader, EPL Mb
(1 of 3) . 39

ISO/IEC 80079-38:2016 – 5 –
 ISO/IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 38: Equipment and components in explosive
atmospheres in underground mines

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 80079-38 has been prepared by subcommittee 31M: Non-
electrical equipment and protective systems for explosive atmospheres, of IEC technical
committee 31: Equipment for explosive atmospheres.
It is published as a double logo standard.
The text of this standard is based on the following documents of the IEC:
FDIS Report on voting
31M/105/FDIS 31M/111/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table. In ISO, the standard has been approved by 13 P members
out of 21 having cast a vote.
– 6 – ISO/IEC 80079-38:2016
 ISO/IEC 2016
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
"A list of all parts in the IEC 60079 series, under the general title Explosive atmospheres, as
well as the International Standard 80079 series, can be found on the IEC website."
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
ISO/IEC 80079-38:2016 – 7 –
 ISO/IEC 2016
INTRODUCTION
This part of ISO/IEC 80079 specifies requirements for the constructional features of
equipment and components that may be an individual item or form an assembly, to enable
them to be used in mines, or parts of mines, susceptible to explosive atmospheres of firedamp
and/or combustible dust.
Most of the electrical equipment used on mining machinery is certified as an individual item of
equipment, e.g. the motor, switchgear etc., and meets its own marking requirements. This
certification, however, does not deal with the interconnection of these items of equipment by
cables or the machine electrical power system as an entity. The equipment and components,
including their interconnections, should be assessed, from an ignition point of view, by the
manufacturer.
Both non-electrical equipment and the interconnection of electrical/non-electrical equipment
require an ignition hazard assessment.
Therefore, it is necessary that not just the equipment, but all its parts, is examined by the
manufacturer according to a formally documented ignition hazard assessment that establishes
and lists all the possible ignition sources of the equipment including the cables and electrical
supply system. The documentation shall list the measures that shall be introduced to keep
possible ignition sources from becoming effective.
The need for this International Standard arises because of major operational differences
between underground mining operations and those in other industries working with, or in,
explosive atmospheres. Examples of these differences are:
– the product being won from the underground strata may be combustible and may
continually release firedamp during the winning process;
– the ignitability of the atmosphere around equipment and components usually depends
upon the amount of dilution offered by an active ventilating system;
– the atmosphere in the general body of mine air in which machinery is working may change
from one that is potentially explosive to one that is explosive (for example, during an
outburst of firedamp);
– persons working in the mine are usually situated within the potentially explosive
atmosphere;
– there is a need to monitor constantly the mine atmosphere at strategic places to ensure
that power can be disconnected from all equipment except Ma equipment which is suitable
for use in a constantly explosive atmosphere;
– in gassy coal mines, an explosion of firedamp at a machine can raise a combustible dust
cloud that exacerbates the explosion;
– some mining machinery, especially that associated with winning the product, contains
cutting devices and drilling devices that are intended to cut into the combustible product
as part of their normal operation. This introduces an ignition risk from frictional heating or
frictional sparking from contact with strata containing high concentrations of quartz or iron
pyrites;
– long roadways in coal mines are equipped with mineral conveying systems carrying a
product that has a potential for raising a combustible dust cloud and the production of
firedamp.
To decide which equipment or its component parts should merit inclusion in this International
Standard, ignition data has been examined based on international experience.
When drafting this International standard, it has been assumed that equipment and
components are:
– 8 – ISO/IEC 80079-38:2016
 ISO/IEC 2016
– designed in accordance with good engineering practice, taking account of expected
shocks, vibrations and failure modes;
– of sound mechanical and electrical construction;
– made of materials with adequate strength and of suitable quality;
– free from defects; and
– kept in good repair and working order, e.g. so that the required dimensions remain within
permissible tolerance despite wear.

ISO/IEC 80079-38:2016 – 9 –
 ISO/IEC 2016
EXPLOSIVE ATMOSPHERES –
Part 38: Equipment and components in explosive
atmospheres in underground mines

1 Scope
This part of ISO/IEC 80079 specifies the explosion protection requirements for the design,
construction, assessment and information for use (maintenance, repair, marking) of
equipment that may be an individual item or form an assembly.
This includes machinery and components for use in mines susceptible to explosive
atmospheres of firedamp and/or combustible dust. The standard atmospheric conditions
(relating to the explosion characteristics of the atmosphere) under which it may be assumed
that equipment can 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.
This part of ISO/IEC 80079 applies for equipment and components according to EPL Mb to be
used in explosive atmospheres containing firedamp and/or combustible dust.
NOTE 1 In some countries, there might be differences according to the classification, e.g. Mb is similar to
category M2 in the European Union.
For equipment and components according to EPL Ma, the requirements of this standard and
of ISO 80079-36 and IEC 60079-0 apply.
NOTE 2 A standard with additional requirements for EPL Ma is under preparation.
It is necessary to take account of external conditions to the equipment which may affect the
hazard and the resultant protection measures. These measures may include ventilation, gas
detection or gas drainage.
This part of ISO/IEC 80079 also deals with the prevention of ignitions of explosive
atmospheres caused by burning (or smouldering) of combustible material such as fabric
fibres, plastic ”O”-rings, rubber seals, lubricating oils or greases used in the construction of
the equipment if such items could be an ignition source. For example, the mechanical failure
of rotating shaft bearings can result in frictional heating that ignites its plastic cage, plastic
seal or lubricating grease.
Detailed requirements and test procedures for the fire protection of conveyer belts are not
part of this part of ISO/IEC 80079.
2 Normative references
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.
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements

– 10 – ISO/IEC 80079-38:2016
 ISO/IEC 2016
IEC 60079-25, Explosive atmospheres – Part 25: Intrinsically safe electrical systems
IEC 60204-1, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 60204-11, Safety of machinery – Electrical equipment of machines – Part 11:
Requirements for HV equipment for voltages above 1 000 V a.c. or 1 500 V d.c. and not
exceeding 36 kV
IEC 60332-1 (all parts), Tests on electric and optical fibre cables under fire conditions
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 62061, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems
ISO 340, Conveyor belts – Laboratory scale flammability characteristics – Requirements and
test method
ISO 630-5, Structural steels – Part 5: Technical delivery conditions for structural steels with
improved atmospheric corrosion resistance
ISO 1940-1, Mechanical vibration – Balance quality requirements for rotors in a constant
(rigid) state – Part 1: Specification and verification of balance tolerances
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
ISO 13849-1, Safety of Machinery – Safety-related parts of control systems – Part 1: General
principles for design
ISO 14916, Thermal spraying – Determination of tensile adhesive strength
ISO 14935, Petroleum and related products – Determination of wick flame persistence of fire-
resistant fluids
ISO 15029-1, Petroleum and related products – Determination of spray ignition characteristics
of fire-resistant fluids – Part 1: Spray flame persistence – Hollow-cone nozzle method
ISO/TS 15029-2, Petroleum and related products – Determination of spray ignition
characteristics of fire-resistant fluids – Part 2: Spray test – Stabilized flame heat release
method
ISO 80079-36:2016, Explosive atmospheres – Part 36: Non-electrical equipment for explosive
atmospheres – Basic method and requirements
ISO 80079-37:2016, Explosive atmospheres – Part 37: Non-electrical equipment for explosive
atmospheres – Non-electrical type of protection constructional safety ‘c’, control of ignition
sources ‘b’, liquid immersion ‘k’
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC 60079-0,
ISO/IEC 80079-36, ISO/IEC 80079-37 and the following apply.

ISO/IEC 80079-38:2016 – 11 –
 ISO/IEC 2016
3.1
firedamp
flammable mixture of gases naturally occurring in a mine
Note 1 to entry: As firedamp consists mainly of methane, the terms firedamp and methane are used frequently in
mining practice as synonyms.
[SOURCE: IEC 60079-0:2011, 3.34, Note modified]
3.2
protection against firedamp explosions
explosion prevention and protection in underground parts of mines and those parts of surface
installations of such mines liable to be endangered by firedamp and or flammable dust
3.3
flammable substance
substance in the form of gas, vapour, liquid, solid, or mixtures of these, able to undergo an
exothermic reaction with air when ignited
3.4
component
any item essential to the safe functioning of equipment and protective systems but with no
autonomous function
3.5
equipment
machines, apparatus, fixed or mobile devices, control components and instrumentation
thereof and detection and prevention systems which, separately or jointly, are intended for the
generation, transfer, storage, measurement, control and conversion of energy, for the
processing of material, and which may be capable of causing an explosion through their own
source(s) of ignition
[SOURCE: ISO/IEC 80079-36:2016, 3.10]
3.6
explosion
sudden increase of pressure and temperature, due to oxidation or other exothermic reaction
[SOURCE: IEC 60050-426:2008, 426-02-13, modified, (removal of "(of an explosive
atmosphere)" from the title)]
3.7
explosive atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas,
vapour, dust, fibres, or flyings which, after ignition, permits self-sustaining propagation
[SOURCE: IEC 60079-0:2011, 3.30]
3.8
intended use
use of equipment, protective systems and devices in accordance with the equipment group
and equipment protection level (EPL), and taking into account all the information supplied by
the manufacturer which is required for the safe functioning of equipment, protective systems
and devices
– 12 – ISO/IEC 80079-38:2016
 ISO/IEC 2016
3.9
machinery
assembly, fitted with or intended to be fitted with a drive system consisting of linked parts or
components, at least one of which moves, and which are joined together for a specific
application
Note 1 to entry: The term "machinery" also covers an assembly of machines which, in order to achieve the same
end, are arranged and controlled so that they function as an integral whole.
[SOURCE: ISO 12100]
3.10
malfunction
equipment or components which do not perform their intended function with respect to
explosion protection
Note 1 to entry: For the purposes of this standard this can happen
...