IEC 60079-18:2009
(Main)Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
IEC 60079-18:2009 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 where the rated voltage does not exceed 11 kV. The significant technical changes with respect to the previous edition are as follows:
- Incorporation of level of protection "mc"
- Equipment protection levels (EPL Ma, Ga, Da, Mb, Gb, Db, Gc, Dc)
- Incorporation of the dust requirements
- Incorporation of switching contacts for level of protection "ma".
The contents of the corrigendum of June 2009 have been included in this copy. This publication is to be read in conjunction with IEC 60079-0:2007.
Atmosphères explosives - Partie 18: Protection du matériel par encapsulage "m"
IEC 60079-18:2009 définit les exigences spécifiques à la construction, aux essais et au marquage des matériels électriques, des parties de matériels électriques et des composants Ex protégés par encapsulage de type "m" et destinés à une utilisation dans les atmosphères explosives gazeuses ou les atmosphères explosives poussiéreuses. La présente partie ne s'applique qu'aux matériels électriques protégés par encapsulage, aux parties de matériel électrique protégées par encapsulage et aux composants Ex protégés par encapsulage pour lesquels la tension assignée n'excède pas 11 kV. Les modifications techniques importantes par rapport à l'édition antérieure sont indiquées ci-dessous:
- Introduction du niveau de protection "mc"
- Niveaux de protection du matériel (EPL Ma, Ga, Da, Mb, Gb, Db, Gc, Dc)
- Introduction des exigences pour la poussière
- Introduction des contacts de commutation pour le niveau de protection "ma".
Le contenu du corrigendum de juin 2009 a été pris en considération dans cet exemplaire. Cette publication doit être lue conjointement avec la CE I 60079-0:2007.
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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»
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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 978-2-88910-046-0
– 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 .13
7.3.1 Group III “m” equipment.13
7.3.2 Group I and Group II “m” equipment .14
7.4 Thickness of the compound .15
7.4.1 “m” equipment .15
7.4.2 Windings for electrical machines .17
7.4.3 Rigid, multi-layer printed wiring boards with through connections .17
7.5 Switching contacts .18
7.5.1 Level of protection “ma”.18
7.5.2 Level of protection “mb”.18
7.5.3 Level of protection “mc” .18
7.6 External connections .19
7.6.1 General .19
7.6.2 Additional requirements for “ma” equipment .19
7.7 Protection of bare live parts.19
7.8 Cells and batteries .19
7.8.1 General .19
7.8.2 Prevention of gassing .19
7.8.3 Protection against inadmissible temperatures and damage to the cells .20
60079-18 © IEC:2009 – 3 –
7.8.4 Reverse current.20
7.8.5 Current limitation .20
7.8.6 Protection against the polarity inversion and deep discharge of the
cells .20
7.8.7 Charging of cells or batteries.21
7.8.8 Requirements for control safety devices for cells or batteries .21
7.9 Protective devices .21
7.9.1 General .21
7.9.2 Electrical protective devices .22
7.9.3 Thermal protective devices .23
7.9.4 Built-in protective devices.23
8 Type tests .23
8.1 Tests on the compound .23
8.1.1 Water absorption test .23
8.1.2 Dielectric strength test.24
8.2 Tests on the apparatus.24
8.2.1 Test sequence.24
8.2.2 Maximum temperature .24
8.2.3 Thermal endurance test.24
8.2.4 Dielectric strength test.25
8.2.5 Cable pull test .25
8.2.6 Pressure test for Group I and Group II electrical equipment.26
8.2.7 Test for resettable thermal protective device .26
8.2.8 Sealing test for build-in protective devices.27
9 Routine verifications and tests.27
9.1 Visual inspections .27
9.2 Dielectric strength test.27
10 Marking .27
Annex A (informative) Basic requirements for compounds for “m” equipment .29
Annex B (normative) Allocation of test samples .30
Bibliography.31
Figure 1 – Dimensional key for thickness through the compound .16
Figure 2 – Minimum distances for multi-layer printed wiring boards.18
Figure 3 – Fitting of blocking diodes .20
Figure A.1 − Basic requirements for compounds for “m” equipment.
...
IEC 60079-18 ®
Edition 3.0 2009-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 18: Equipment protection by encapsulation “m”
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
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Centre: csc@iec.ch.
IEC 60079-18 ®
Edition 3.0 2009-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 18: Equipment protection by encapsulation “m”
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8891-0046-0
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»
– 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 .13
7.3.1 Group III “m” equipment.13
7.3.2 Group I and Group II “m” equipment .14
7.4 Thickness of the compound .15
7.4.1 “m” equipment .15
7.4.2 Windings for electrical machines .17
7.4.3 Rigid, multi-layer printed wiring boards with through connections .17
7.5 Switching contacts .18
7.5.1 Level of protection “ma”.18
7.5.2 Level of protection “mb”.18
7.5.3 Level of protection “mc” .18
7.6 External connections .19
7.6.1 General .19
7.6.2 Additional requirements for “ma” equipment .19
7.7 Protection of bare live parts.19
7.8 Cells and batteries .19
7.8.1 General .19
7.8.2 Prevention of gassing .19
7.8.3 Protection against inadmissible temperatures and damage to the cells .20
60079-18 © IEC:2009 – 3 –
7.8.4 Reverse current.20
7.8.5 Current limitation .20
7.8.6 Protection against the polarity inversion and deep discharge of the
cells .20
7.8.7 Charging of cells or batteries.21
7.8.8 Requirements for control safety devices for cells or batteries .21
7.9 Protective devices .21
7.9.1 General .21
7.9.2 Electrical protective devices .22
7.9.3 Thermal protective devices .23
7.9.4 Built-in protective devices.23
8 Type tests .23
8.1 Tests on the compound .23
8.1.1 Water absorption test .23
8.1.2 Dielectric strength test.24
8.2 Tests on the apparatus.24
8.2.1 Test sequence.24
8.2.2 Maximum temperature .24
8.2.3 Thermal endurance test.24
8.2.4 Dielectric strength test.25
8.2.5 Cable pull test .25
8.2.6 Pressure test for Group I and Group II electrical equipment.26
8.2.7 Test for resettable thermal protective device .26
8.2.8 Sealing test for build-in protective devices.27
9 Routine verifications and tests.27
9.1 Visual inspections .27
9.2 Dielectric strength test.27
10 Marking .27
Annex A (informative) Basic requirements for compounds for “m” equipment .29
Annex B (normative) Allocation of test samples .30
Bibliography.31
Figure 1 – Dimensional key for thickness through the compound .16
Figure 2 – Minimum distances for multi-layer printed wiring boards.18
Figure 3 – Fitting of blocking diodes .20
Figure A.1 − Basic requirements for compounds for “m” equipment.29
Table 1 – Distances through the compound .13
Table 2 – Minimum thickness of compound adjacent to free space for Group III “m”
equipment.13
Table 3 – Minimum thickness of compound adjacent to free space for Group I and
Group II “m” equipment.14
Table 4 – Thickness of the compound.16
Table 5 – Minimum distances for multi-layer printed wiring boards.17
Table 6 – Test pressure .26
Table B.1 − Allocation of test samples .30
– 4 – 60079-18 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 18: Equipment protection by encapsulation “m”
FOREWORD
1) The International Electrotechnical Commission (I
...
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