EN 60079-18:2009

SLOVENSKI STANDARD
01-marec-2010
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Explosive atmospheres -- Part 18: Equipment protection by encapsulation m
Explosionsfähige Atmosphäre -- Teil 18: Geräteschutz durch Vergusskapselung m
Atmosphères explosives -- Partie 18: Protection du matériel par encapsulage m
Ta slovenski standard je istoveten z: EN 60079-18:2009
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60079-18
NORME EUROPÉENNE
December 2009
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 60079-18:2004 + corr. April 2006 and EN 61241-18:2004

English version
Explosive atmospheres -
Part 18: Equipment protection by encapsulation "m"
(IEC 60079-18:2009 + corrigendum 2009)

Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 18: Protection du matériel Teil 18: Geräteschutz
par encapsulage "m" durch Vergusskapselung "m"
(CEI 60079-18:2009 + corrigendum 2009) (IEC 60079-18:2009 + Corrigendum 2009)

This European Standard was approved by CENELEC on 2009-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-18:2009 E
Foreword
The text of document 31/784/FDIS, future edition 3 of IEC 60079-18, prepared by IEC TC 31, Equipment
for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60079-18 on 2009-10-01.
This European Standard supersedes EN 60079-18:2004 + corrigendum April 2006 and
EN 61241-18:2004.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-10-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive ATEX (94/9/EC). See Annex ZZ.
CENELEC/TC 31 as the responsible committee has concluded that this new edition of EN 60079-18 does
not contain substantial changes regarding the ESRs.
The State of the Art is included in Annex ZY “Significant changes between this European Standard and
EN 60079-18:2004".
Annexes ZA, ZY and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-18:2009 + corrigendum June 2009 was approved by
CENELEC as a European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60079-1 NOTE  Harmonized as EN 60079-1:2007 (not modified).
IEC 60079-2 NOTE  Harmonized as EN 60079-2:2007 (not modified).
IEC 60079-5 NOTE  Harmonized as EN 60079-5:2007 (not modified).
IEC 60079-6 NOTE  Harmonized as EN 60079-6:2007 (not modified).
IEC 60079-10 NOTE  Harmonized as EN 60079-10:2003 (not modified).
IEC 60079-14 NOTE  Harmonized as EN 60079-14:2008 (not modified).
IEC 60079-26 NOTE  Harmonized as EN 60079-26:2007 (not modified).
IEC 60079-28 NOTE  Harmonized as EN 60079-28:2007 (not modified).
IEC 60086-1 NOTE  Harmonized as EN 60086-1:2007 (not modified).
IEC 60622 NOTE  Harmonized as EN 60622:2003 (not modified).
IEC 60664-1 NOTE  Harmonized as EN 60664-1:2007 (not modified).
IEC 61241-10 NOTE  Harmonized as EN 61241-10:2004 (not modified).
IEC 61951-1 NOTE  Harmonized as EN 61951-1:2003 (not modified).

- 3 - EN 60079-18:2009
IEC 61951-2 NOTE  Harmonized as EN 61951-2:2003 (not modified).
IEC 61960-1 NOTE  Harmonized as EN 61960-1:2001 (not modified).
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 60079-0 - Explosive atmospheres - EN 60079-0 2009
Part 0: Equipment - General requirements

1) 2)
IEC 60079-7 - Explosive atmospheres - EN 60079-7 2007
Part 7: Equipment protection by increased
safety "e"
1) 2)
IEC 60079-11 - Explosive atmospheres - EN 60079-11 2007
Part 11: Equipment protection by intrinsic
safety "i"
1) 3)
IEC 60079-15 - Explosive atmospheres - EN 60079-15 200X
Part 15: Equipment protection by type of
protection "n"
1) 2)
IEC 60079-26 - Explosive atmospheres - EN 60079-26 2007
Part 26: Equipment with equipment protection
level (EPL) Ga
1) 2)
IEC 60079-31 - Explosive atmospheres - EN 60079-31 2009
Part 31: Equipment dust ignition protection by
enclosure "t"
IEC 60127 Series Miniature fuses EN 60127 Series

1) 2)
IEC 60243-1 - Electrical strength of insulating materials - EN 60243-1 1998
Test methods -
Part 1: Tests at power frequencies

1) 2)
IEC 60691 - Thermal-links - Requirements and application EN 60691 2003
guide
1)
IEC 60730-2-9 - Automatic electrical controls for household - -
(mod) and similar use -
Part 2-9: Particular requirements for
temperature sensing controls
1) 2)
IEC 60738-1 - Thermistors - Directly heated positive EN 60738-1 2006
temperature coefficient -
Part 1: Generic specification
1) 2)
IEC 61241-11 - Electrical apparatus for use in the presence of EN 61241-11 2006
combustible dust -
Part 11: Protection by intrinsic safety 'iD'

1)
Undated reference.
2)
Valid edition at date of issue.
3)
To be ratified.
- 5 - EN 60079-18:2009
Publication Year Title EN/HD Year

1) 2)
IEC 61558-2-6 - Safety of power transformers, power supply EN 61558-2-6 2009
units and similar -
Part 2-6: Particular requirements for safety
isolating transformers for general use

1) 2)
IEC 62326-4-1 - Printed boards - EN 62326-4-1 1997
Part 4: Rigid multilayer printed boards with
interlayer connections - Sectional
specification - Section 1: Capability Detail
Specification - Performance levels A, B and C

1)
ISO 62 - Plastics - Determination of water absorption - -

1)
ANSI/UL 248-1 - Standard for low-voltage fuses - - -
Part 1: General requirements
1)
ANSI/UL 746B - Standard for polymeric materials - Long-term - -
property evaluations
Annex ZY
(informative)
Significant changes between this European Standard and EN 60079-18:2004
The significant changes with respect to EN 60079-18:2004 are as listed below.
Type
Minor and Extension Substantial
editorial change
changes regarding
a
ESR´s
Incorporation of level of protection "mc" X
Equipment protection levels (EPL Ma, Ga, Da, Mb, Gb, Db,
X
Gc, Dc)
Incorporation of the dust requirements X
Incorporation of switching contacts for level of protection
X
"ma"
a
ESR = Essential Health and Safety Requirements (Annex II of Directive 94/9/EC)

General conclusion on the change of the State of the Art by this standard
CENELEC/TC 31 as the responsible committee has concluded that this new edition of EN 60079-18 does
not contain substantial changes regarding the ESRs.

- 7 - EN 60079-18:2009
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 1.0.5 (partly)
– ER 1.1 (partly)
– ER 1.2.4, ER 1.2.8
– ER 1.3.1
– 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 2.1.2.3 (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 concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
__________
IEC 60079-18 ®
Edition 3.0 2009-05
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
V
CODE PRIX
ICS 29.260.20 ISBN 2-8318-1036-2
– 2 – 60079-18 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 General .9
4.1 Level of protection (Equipment protection level (EPL)) .9
4.2 Additional requirements for level of protection “ma”.9
4.3 Rated voltage and prospective short circuit current .9
5 Requirements for compounds .9
5.1 General .9
5.2 Specification .9
5.3 Properties of the compound.10
5.3.1 Water absorption .10
5.3.2 Dielectric strength .10
6 Temperatures .10
6.1 General .10
6.2 Determination of the limiting temperature .10
6.2.1 Maximum surface temperature.10
6.2.2 Temperature of the compound .10
6.3 Temperature limitation.10
7 Constructional requirements .11
7.1 General .11
7.2 Determination of faults .11
7.2.1 Fault examination .11
7.2.2 Components considered as not subject to fail .12
7.2.3 Isolating components.12
7.2.4 Infallible separation distances.12
7.3 Free space in the encapsulation .
...