1、BSI Standards PublicationExplosive atmospheresPart 18: Equipment protection by encapsulation “m”BS EN 60079-18:2015BS EN 60079-18:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 60079-18:2015. It is identical to IEC 60079-18:2014. It supersedes BS EN 60079-
2、18:2009 which is withdrawn.BSI, as a member of CENELEC, is obliged to publish EN 60079-18 as a British Standard. However, attention is drawn to the fact that the UK committee voted against its approval as a European Standard.This was due to an internal inconsistency in clause 7.2.Clause 7.2.1 states
3、 that faults are not taken into account for “mc”, whereas the last sentence of 7.2.4.2 specifies absolute requirements for “mc” to avoid faults, making the requirements for some “mc” circuits more arduous than the same circuit for “ma” or “mb”.As this is not new text for this edition, it is assumed
4、that in many cases this has been resolved by the manufacturer and certifier reading 7.2.1 and then assuming, for “mc” equipment, that there is no need to read further into 7.2, therefore ignoring 7.2.4.2.As it is not possible to satisfy both 7.2.1 and 7.2.4.2 at the same time, it is the opinion of t
5、he UK committee that 7.2.4.2 is not intended to be observed for “mc” equipment, and they have requested that IEC issue a formal corrigendum to that effect.It is believed that the “mc” column of Table 1 was erroneously copied from 60079-15 and the purpose changed. In 60079-15, the table referred to s
6、egregation under 0.4 mm of compound in an IP54 enclosure for Ex nA equipment. That is to say that a 0.4 mm layer of encapsulant was considered to be better than conformal coating in terms of environmental protection. It was not related to the ability of the encapsulation to withstand an internal fau
7、lt. The table was not applied to Ex n encapsulation and therefore should not have been applied to Ex mc.The UK participation in its preparation was entrusted to Technical Committee EXL/31, Equipment for explosive atmospheres.A list of organizations represented on this committee can be obtained on re
8、quest to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 80686 5ICS 29.260.20Compliance with a Briti
9、sh Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2015.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60079-
10、18 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) Atmosphres explosives - Partie 18: Protection du matriel par encapsulage “m“ (IEC 60079-18:2014) Explosionsgefhrdete Bereiche - Teil
11、18: Gerteschutz durch Vergusskapselung “m“ (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 standar
12、d 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
13、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, Croati
14、a, 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
15、 and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and b
16、y any means reserved worldwide for CENELEC Members. Ref. No. EN 60079-18:2015 E BS EN 60079-18:2015EN 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 paralle
17、l vote and approved by CENELEC as EN 60079-18:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-10-24 latest date by which the national standards conflicting wit
18、h the document have to be withdrawn (dow) 2018-01-16 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 paten
19、t 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 docum
20、ent. 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
21、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
22、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. BS EN 60079-18:2015 2 BS EN 60079-18:2015EN 60079-18:2015- 3 - EN 60079-18:2015 A
23、nnex 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 appl
24、ies. 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 t
25、he 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 - General requirements EN 60079-0 - +A11 2013 IEC 60079-7 - Explosive atmospheres - Part 7: Equipment protection by increased
26、safety “e“ EN 60079-7 - IEC 60079-11 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety “i“ EN 60079-11 - IEC 60079-15 - Explosive atmospheres - Part 15: Equipment protection by type of protection “n“ EN 60079-15 - IEC 60079-26 - Explosive atmospheres - Part 26: Equipment wi
27、th equipment protection level (EPL) Ga EN 60079-26 - IEC 60079-31 - Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure “t“ EN 60079-31 - IEC 60127 series Miniature fuses - Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links EN 60127
28、 series IEC 60243-1 - Electric strength of insulating materials - Test methods - Part 1: Tests at power frequencies EN 60243-1 - IEC 60691 - Thermal-links - Requirements and application guide EN 60691 - IEC 60730-2-9 (mod) - Automatic electrical controls for household and similar use - Part 2-9: Par
29、ticular requirements for temperature sensing controls EN 60730-2-9 - +AA IEC 60738-1 - Thermistors - Directly heated positive temperature coefficient - Part 1: Generic specification EN 60738-1 - IEC 61140 - Protection against electric shock - Common aspects for installation and equipment EN 61140 -
30、IEC 61558-1 - Safety of power transformers, power supplies, reactors and similar products - Part 1: General requirements and tests EN 61558-1 - +EN 61558-1:2005/corrigendum Aug. 2006 2006 IEC 61558-2-6 - Safety of transformers, reactors, power supply units and similar products for supply voltages up
31、 to 1 100 V - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers EN 61558-2-6 - BS EN 60079-18:2015 3 BS EN 60079-18:2015EN 60079-18:2015EN 60079-18:2015 - 4 - IEC 62326-4-1 - Printed boards - Part 4: Rigid
32、 multilayer printed boards with interlayer connections - Sectional specification - Section 1: Capability Detail Specification - Performance levels A, B and C EN 62326-4-1 - BS EN 60079-18:2015 4 BS EN 60079-18:2015EN 60079-18:2015- 5 - EN 60079-18:2015 Annex ZZ (informative) Coverage of Essential Re
33、quirements 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 Directi
34、ve 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.
35、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 conform
36、ity with the specified essential requirements of the Directives concerned. WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard. BS EN 60079-18:2015 5 BS EN 60079-18:2015EN 60079-18:2015 2 IEC 60079-18:2014 IEC 2014 CONTENTS
37、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 an
38、d 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 Maxim
39、um 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 Inf
40、allible 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
41、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 o
42、f bare live parts 21 7.8 Cells and batteries 21 7.8.1 General . 21 BS EN 60079-18:2015BS EN 60079-18:2015IEC 60079-18:2014 IEC 2014 6 9121213141414141515151515151516161616161616161717171818191920212123232424252525252525252525IEC 60079-18:2014 IEC 2014 3 7.8.2 Prevention of gassing 22 7.8.3 Protectio
43、n 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 de
44、vices 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 te
45、st . 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 pr
46、otective 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 o
47、f 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
48、 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 BS EN 60079-18:2015BS EN 60079-18:2015IEC 6007
49、9-18:2014 IEC 2014 7 26262627272728282829293030303030303031313232333434343434353637382224273619202123 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 BS EN 60079-18:2015BS EN 60079-18:2015IEC 60079-18:2014 IEC 2014 8 243337IEC 60079-18:2014 IEC 2014 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSP
