SIST EN 60079-18:2015
(Main)Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079-18:2014)
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079-18:2014)
This part of IEC 60079 gives the specific requirements for the construction, testing and
marking of electrical equipment, parts of electrical equipment and Ex components with the
type of protection encapsulation “m” intended for use in explosive gas atmospheres or
explosive dust atmospheres.
This part applies only for encapsulated electrical equipment, encapsulated parts of electrical
equipment and encapsulated Ex components (hereinafter always referred to as “m”
equipment) where the rated voltage does not exceed 11 kV.
The application of electrical equipment in atmospheres, which may contain explosive gas as
well as combustible dust simultaneously, may require additional protective measures.
This standard does not apply to dusts of explosives, which do not require atmospheric oxygen
for combustion, or to pyrophoric substances
This standard does not take account of any risk due to an emission of flammable or toxic gas
from the dust.
This standard supplements and modifies the general requirements of IEC 60079-0. Where a
requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of
this standard takes precedence.
Explosionsgefährdete Bereiche - Teil 18: Geräteschutz durch Vergusskapselung "m" (IEC 60079-18:2014)
Atmosphères explosives - Partie 18: Protection du matériel par encapsulage "m" (IEC 60079-18:2014)
Eksplozivne atmosfere - 18. del: Zaščita opreme z zalivanjem z zalivno maso "m" (IEC 60079-18:2014)
Ta del standarda IEC 60079 vsebuje posebne zahteve za konstrukcijo, preskušanje in označevanje električne opreme, delov električne opreme in komponent Ex s tipom zaščitne enkapsulacije »m«, ki je namenjena za uporabo v eksplozivnih plinskih atmosferah ali eksplozivnih prašnih atmosferah.
Ta del se uporablja samo za enkapsulirano električno opremo, enkapsulirane dele električne opreme in enkapsulirane komponente Ex (v nadaljnjem besedilu vedno imenovane oprema »m«), pri katerih nazivna napetost ne presega 11 kV.
Uporaba električne opreme v atmosferah, ki lahko hkrati vsebujejo eksploziven plin in gorljivi prah, lahko zahteva dodatne zaščitne ukrepe.
Ta standard se ne uporablja za prah eksplozivov, ki za zgorevanje ne potrebujejo atmosferskega kisika, ali za piroforne snovi.
Ta standard ne upošteva nobenega tveganja zaradi emisije vnetljivega ali strupenega plina iz prahu.
Ta standard dopolnjuje in spreminja splošne zahteve standarda IEC 60079-0. Kadar je zahteva iz tega standarda v nasprotju z zahtevo iz standarda IEC 60079-0, ima prednost zahteva iz tega standarda.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60079-18:2015
01-julij-2015
(NVSOR]LYQHDWPRVIHUHGHO =DãþLWDRSUHPH]]DOLYDQMHP]]DOLYQRPDVR
P ,(&
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079
-18:2014)
Explosionsgefährdete Bereiche - Teil 18: Geräteschutz durch Vergusskapselung
"m" (IEC 60079-18:2014)
Atmosphères explosives - Partie 18: Protection du matériel par encapsulage "m" (IEC
60079-18:2014)
Ta slovenski standard je istoveten z: EN 60079-18:2015
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 60079-18:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60079-18:2015
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SIST EN 60079-18:2015
EUROPEAN STANDARD EN 60079-18
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2015
ICS 29.260.20 Supersedes EN 60079-18:2009
English Version
Explosive atmospheres - Part 18: Equipment protection by
encapsulation "m"
(IEC 60079-18:2014)
Atmosphères explosives - Partie 18: Protection du matériel Explosionsgefährdete Bereiche - Teil 18: Geräteschutz
par encapsulage "m" durch Vergusskapselung "m"
(IEC 60079-18:2014) (IEC 60079-18:2014)
This European Standard was approved by CENELEC on 2015-01-15. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60079-18:2015 E
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SIST EN 60079-18:2015
EN 60079-18:2015 - 2 -
Foreword
The text of document 31/1152/FDIS, future edition 4 of IEC 60079-18, prepared by IEC/TC 31 "Equipment
for explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN 60079-18:2015.
The following dates are fixed:
(dop) 2015-10-24
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2018-01-16
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60079-18:2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and
the European Free Trade Association, and supports essential requirements of EU Directive.
For the relationship with EU Directive see informative Annex ZZ, which is an integral part of this document.
Endorsement notice
The text of the International Standard IEC 60079-18:2014 was approved by CENELEC as a European
Standard without any modification.
IEC 60079-1 NOTE Harmonized as EN 60079-1.
IEC 60079-2 NOTE Harmonized as EN 60079-5.
IEC 60079-5 NOTE Harmonized as EN 60079-5.
IEC 60079-6 NOTE Harmonized as EN 60079-6.
IEC 60079-10-1 NOTE Harmonized as EN 60079-10-1.
IEC 60079-10-2 NOTE Harmonized as EN 60079-10-2.
IEC 60079-14 NOTE Harmonized as EN 60079-14.
IEC 60079-28 NOTE Harmonized as EN 60079-28.
IEC 60086-1 NOTE Harmonized as EN 60086-1.
IEC 60622 NOTE Harmonized as EN 60622.
IEC 60604-1 NOTE Harmonized as EN 60604-1.
IEC 60747-5-5 NOTE Harmonized as EN 60747-5-5.
IEC 61951-1 NOTE Harmonized as EN 61951-1.
IEC 61951-2 NOTE Harmonized as EN 61951-2.
ISO 13849-1 NOTE Harmonized as EN ISO 13849-1.
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SIST EN 60079-18:2015
- 3 - EN 60079-18:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60079-0 (mod) - Explosive atmospheres -- Part 0: Equipment - EN 60079-0 -
General requirements
+A11 2013
IEC 60079-7 - Explosive atmospheres -- Part 7: Equipment EN 60079-7 -
protection by increased safety "e"
IEC 60079-11 - Explosive atmospheres -- Part 11: Equipment EN 60079-11 -
protection by intrinsic safety "i"
IEC 60079-15 - Explosive atmospheres -- Part 15: Equipment EN 60079-15 -
protection by type of protection "n"
IEC 60079-26 - Explosive atmospheres -- Part 26: Equipment EN 60079-26 -
with equipment protection level (EPL) Ga
IEC 60079-31 - Explosive atmospheres -- Part 31: Equipment EN 60079-31 -
dust ignition protection by enclosure "t"
IEC 60127 series Miniature fuses -- Part 1: Definitions for EN 60127 series
miniature fuses and general requirements for
miniature fuse-links
IEC 60243-1 - Electric strength of insulating materials - Test EN 60243-1 -
methods -- Part 1: Tests at power frequencies
IEC 60691 - Thermal-links - Requirements and application EN 60691 -
guide
IEC 60730-2-9 (mod) - Automatic electrical controls for household EN 60730-2-9 -
and similar use - Part 2-9: Particular
requirements for temperature sensing
controls
+AA
IEC 60738-1 - Thermistors - Directly heated positive EN 60738-1 -
temperature coefficient -- Part 1: Generic
specification
IEC 61140 - Protection against electric shock - Common EN 61140 -
aspects for installation and equipment
IEC 61558-1 - Safety of power transformers, power supplies, EN 61558-1 -
reactors and similar products -- Part 1:
General requirements and tests
+EN 61558- 2006
1:2005/corrigendum
Aug. 2006
IEC 61558-2-6 - Safety of transformers, reactors, power EN 61558-2-6 -
supply units and similar products for supply
voltages up to 1 100 V -- Part 2-6: Particular
requirements and tests for safety isolating
transformers and power supply units
incorporating safety isolating transformers
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SIST EN 60079-18:2015
EN 60079-18:2015 - 4 -
IEC 62326-4-1 - Printed boards -- Part 4: Rigid multilayer EN 62326-4-1 -
printed boards with interlayer connections -
Sectional specification -- Section 1: Capability
Detail Specification - Performance levels A, B
and C
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SIST EN 60079-18:2015
- 5 - EN 60079-18:2015
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers only
the following essential requirements out of those given in Annex II of the EC Directive 94/9/EC:
– ER 1.0.1, ER 1.0.2 (partly), ER 1.0.4 (partly), ER 1.0.5 (partly)
– ER 1.1 (partly)
– ER 1.2.4, ER 1.2.8 (partly)
– ER 1.3.1 (partly) ER 1.3.3 (partly), ER 1.3.4 (partly)
– ER 1.4.1 (partly), ER 1.4.2 (partly)
– ER 1.5.1, ER 1.5.2
– ER 1.6.4 (partly),
– ER 2.0.1 (partly)
– ER 2.0.2.1 (partly), ER 2.0.2.3 (partly)
– ER 2.1.1.1 (partly), ER 2.1.1.2 (partly)
– ER 2.1.2.1 (partly), ER 2.1.2.2 (partly) ER 2.1.2.3 (partly)
– ER 2.2.1.1 (partly), ER 2.2.1.2 (partly)
– ER 2.2.2.1 (partly), ER 2.2.2.2 (partly)
– ER 2.3.1.1, ER 2.3.1.2
– ER 2.3.2.1, ER 2.3.2.2
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive[s] concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products
falling within the scope of this standard.
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SIST EN 60079-18:2015
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SIST EN 60079-18:2015
IEC 60079-18
®
Edition 4.0 2014-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 18: Equipment protection by encapsulation “m”
Atmosphères explosives –
Partie 18: Protection du matériel par encapsulage "m"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 29.260.20 ISBN 978-2-8322-1994-2
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60079-18:2015
– 2 – IEC 60079-18:2014 IEC 2014
CONTENTS
FOREWORD . 5
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General . 10
4.1 Level of protection (equipment protection level (EPL)) . 10
4.2 Additional requirements for levels of protection “ma” and “mb” . 10
4.3 Additional requirements for level of protection “ma” . 10
4.4 Rated voltage and prospective short circuit current . 11
5 Requirements for compounds . 11
5.1 General . 11
5.2 Specification . 11
5.3 Properties of the compound . 11
5.3.1 Water absorption . 11
5.3.2 Dielectric strength . 11
6 Temperatures . 12
6.1 General . 12
6.2 Determination of the limiting temperatures . 12
6.2.1 Maximum surface temperature . 12
6.2.2 Temperature of the compound . 12
6.3 Temperature limitation . 12
7 Constructional requirements . 12
7.1 General . 12
7.2 Determination of faults . 13
7.2.1 Fault examination . 13
7.2.2 Components considered as not subject to fail . 13
7.2.3 Isolating components . 14
7.2.4 Infallible separation distances . 14
7.3 Free space in the encapsulation . 15
7.3.1 Group III “m” equipment . 15
7.3.2 Group I and Group II “m” equipment . 16
7.4 Thickness of the compound. 17
7.4.1 “m” equipment . 17
7.4.2 Windings for electrical machines . 19
7.4.3 Rigid, multi-layer printed wiring boards with through connections . 19
7.5 Switching contacts . 20
7.5.1 General . 20
7.5.2 Level of protection “ma” . 21
7.5.3 Level of protection “mb” . 21
7.5.4 Level of protection “mc” . 21
7.6 External connections . 21
7.6.1 General . 21
7.6.2 Additional requirements for “ma” equipment . 21
7.7 Protection of bare live parts . 21
7.8 Cells and batteries . 21
7.8.1 General . 21
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SIST EN 60079-18:2015
IEC 60079-18:2014 IEC 2014 – 3 –
7.8.2 Prevention of gassing . 22
7.8.3 Protection against inadmissible temperatures and damage to the cells
or batteries . 22
7.8.4 Reverse current . 22
7.8.5 Current limitation . 23
7.8.6 Protection against the polarity inversion and deep discharge of the cells . 23
7.8.7 Charging of cells or batteries . 23
7.8.8 Requirements for control safety devices for cells or batteries. 24
7.9 Protective devices . 24
7.9.1 General . 24
7.9.2 Electrical protective devices . 25
7.9.3 Thermal protective devices . 25
7.9.4 Built-in protective devices . 26
8 Type tests . 26
8.1 Tests on the compound . 26
8.1.1 Water absorption test . 26
8.1.2 Dielectric strength test . 26
8.2 Tests on the apparatus . 26
8.2.1 Test sequence . 26
8.2.2 Maximum temperature . 27
8.2.3 Thermal endurance test . 27
8.2.4 Dielectric strength test . 28
8.2.5 Cable pull test . 28
8.2.6 Pressure test for Group I and Group II electrical equipment . 29
8.2.7 Test for resettable thermal protective device. 30
8.2.8 Sealing test for built-in protective devices . 30
9 Routine verifications and tests . 30
9.1 Visual inspections . 30
9.2 Dielectric strength test . 30
10 Marking . 31
Annex A (informative) Basic requirements for compounds for “m” equipment . 32
Annex B (informative) Allocation of test samples . 33
Bibliography . 34
Figure 1 – Dimensional key for thickness through the compound . 18
Figure 2 – Minimum distances for multi-layer printed wiring boards . 20
Figure 3 – Fitting of blocking diodes . 23
Figure A.1 − Basic requirements for compounds for “m” equipment . 32
Table 1 – Distances through the compound . 15
Table 2 – Minimum thickness of compound adjacent to free space for Group III “m”
equipment . 16
Table 3 – Minimum tickness of compound adjacent to free space for Group I and Group
II “m” equipment . 17
Table 4 – Thickness of the compound . 19
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SIST EN 60079-18:2015
– 4 – IEC 60079-18:2014 IEC 2014
Table 5 – Minimum distances for multi-layer printed wiring boards . 20
Table 6 – Test pressure . 29
Table B.1 − Allocation of test samples . 33
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SIST EN 60079-18:2015
IEC 60079-18:2014 IEC 2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 18: Equipment protection by encapsulation “m”
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.
Standard IEC 60079-18 has been prepared by IEC technical committee 31: Equipment for
explosive atmospheres.
This fourth edition cancels and replaces the third edition of IEC 60079-18 (2009), and
constitutes a technical revision.
This International Standard is to be used in conjunction with IEC 60079-0, Explosive
atmospheres – Part 0: Equipment-General requirements.
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SIST EN 60079-18:2015
– 6 – IEC 60079-18:2014 IEC 2014
This edition includes the following significant technical changes with respect to the previous
edition:
Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
Definitions deleted and moved to IEC 60079-0 3 X
Heading modified /added to clarify which requirements are 4 X
additional requirements for “ma” level of protection only
Thermal conductivity added 5.2 X
Note added that it is not a requirement of this standard that 5.3.2 X
conformity to the manufacturer`s specification of the
compound needs to be verified
Clarification added 6.2.2 X
Clarification added 7.1 X
For the determination of faults options added and 7.2 X
clarification given
Additional information included in Figure 1 7.4.1 X
“Varnish and similar coatings are not considered to be solid 7.4.2 X
insulation.” was added in this section and deleted in the
definition on 3.8
For rigid, multi-layer printed wiring boards with through 7.4.3.1 X
connections additional standards added
Protection against inadmissible temperatures and damage 7.8.3 C1
to the cells
Electrical protective devices clarified and additional 7.9.2 X
possibilities added
Thermal protective devices clarified and additional 7.9.3 X
possibilities added
2/3 voltage limitation deleted 7.9.3 X
Determination of the maximum temperature for “Da” fixed 8.2.2 C2
Stabilization of the temperature 8.2.2 C3
Thermal endurance to heat 8.2.3.1 X
Temperature fixed as reference service temperatures and 8.2.3.1.1 X
tests given as alternatives
For the dielectric strength test procedure alternative 8.2.4.1 X
possibilities added
Alternative test methods for the required pressure test for 8.2.6 X
Group I and Group II electrical equipment added
Sealing test for build-in protective devices 8.2.8 X
For the dielectric strength test procedure alternative 9.2 X
possibilities added
Marking 10 X X
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SIST EN 60079-18:2015
IEC 60079-18:2014 IEC 2014 – 7 –
Explanation of the Types of Significant Changes:
A) Definitions
1. Minor and editorial changes:
• Clarification
• Decrease of technical requirements
• Minor technical change
• Editorial corrections
These are changes which modify requirements in an editorial or a minor technical way. They include changes of
the wording to clarify technical requirements without any technical change, or a reduction in level of existing
requirement.
2. Extension:
• Addition of technical options
These are changes 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 will not have to be considered for products in conformity with the preceding edition.
3. Major technical changes:
• addition of technical requirements
• increase of technical requirements
These are changes to technical requirements (addition, increase of the level or removal) made in a way that a
product in conformity with the preceding edition will not always be able to fulfil the requirements given in the
later edition. These changes have to be considered for products in conformity with the preceding edition. For
these changes additional information is provided in item B) below.
Note These changes represent current technological knowledge. However, these changes should not normally
have an influence on equipment already placed on the market.
B) Information about the background of ‘Major technical changes’
C1 Clause 7.8.3 modified and additional requirements added for cells or batteries
C2 The flexibility given in IEC 60079-0 is replaced by a min. requirement. For level of protection “ma”
equipment, designed for EPL “Da” the maximum surface temperature shall be determined with the equipment
mounted in accordance with the manufacturer`s instructions, and surrounded on all available surfaces by dust
with a layer thickness of at least 200 mm
C3 The increase of the temperature during the test can be a very slow process. The final temperature shall be
considered to have been reached when the rate of rise of temperature does not exceed 1 K/24 h
The text of this s
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