1、 IEC 60079-33 Edition 1.0 2012-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 33: Equipment protection by special protection “s” Atmosphres explosives Partie 33: Protection du matriel par protection spciale “s“ IEC60079-33:2012 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyr
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15、chnique International (VEI) en ligne. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60079-33 Edition 1.0 2012-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Pa
16、rt 33: Equipment protection by special protection “s” Atmosphres explosives Partie 33: Protection du matriel par protection spciale “s“ INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE W ICS 29.260.20 PRICE CODE CODE PRIX ISBN 978-2-83220-359-0 Registered trademar
17、k of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 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 agr. 2 60
18、079-33 IEC:2012 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 9 2 Normative references . 9 3 Terms and definitions . 10 4 General 11 4.1 Application 11 4.2 Equipment group and temperature classification 11 4.3 Level of protection (equipment protection level (EPL) . 11 4.4 Manufacturers justificat
19、ion 12 4.5 Verification 12 5 Independent verifier 12 5.1 General . 12 5.2 Competence 12 5.3 Duties 13 5.4 Acceptance . 13 5.5 Independence 13 6 Design and construction . 13 6.1 Principles of an integrated approach to explosion safety . 13 6.2 Design and construction 14 6.3 Overloading of equipment 1
20、4 6.4 Potential ignition sources 14 6.4.1 Hazards arising from different ignition sources 14 6.4.2 Hazards arising from overheating 14 6.4.3 Hazards arising from pressure compensation operations . 14 6.5 Requirements in respect of safety-related devices . 14 7 Application of equipment protection lev
21、els (EPL) 15 7.1 Equipment with EPL Ma 15 7.2 Equipment with EPL Mb 15 7.3 Equipment with EPL Ga . 16 7.4 Equipment with EPL Gb . 17 7.5 Equipment with EPL Gc . 17 7.6 Equipment with EPL Da . 17 7.7 Equipment with EPL Db . 18 7.8 Equipment with EPL Dc . 18 8 Preparation of assessment and test specif
22、ication . 18 8.1 General . 18 8.2 Assessment and test specification . 19 8.3 Assessment and testing. 19 8.4 Reporting results of the assessment and test specification 19 9 Ignition hazard assessment 19 9.1 General . 19 9.2 Protective measures 19 9.3 Explanation of the ignition hazard assessment proc
23、edure 20 9.4 Examples of ignition hazard assessment . 20 10 Application of special protection “s” 20 60079-33 IEC:2012 3 10.1 General . 20 10.2 Justification for the application of special protection “s” . 20 10.2.1 Application 20 10.2.2 Equipment substantially meeting the requirements for the recog
24、nized types of protection . 21 10.2.3 Equipment outside the scope of recognized types of protection . 21 10.2.4 Protection technique with no alignment to the recognized types of protection 21 10.2.5 Enhanced EPL through additional means of protection 22 10.2.6 Combination of approaches . 22 10.3 Ada
25、ption of recognized types of protection 22 10.4 Other innovative means of ensuring safety 22 10.5 Connection of conductor and cables 22 11 Type verification and tests 23 11.1 General . 23 11.2 Temperature measurement test . 23 12 Routine verification and test . 23 13 Documentation . 23 14 Ex compone
26、nts . 23 15 Marking 23 15.1 General . 23 15.2 Marking for Ex “s” only 23 15.3 Marking for Ex “s” with other recognized types of protection 23 16 Certificate information 24 16.1 Certificate for Ex “s” only . 24 16.2 Certificate for Ex “s” with other recognized types of protection 24 16.3 Specific con
27、ditions of use 24 16.4 Schedule of limitations 24 17 Instructions . 24 Annex A (informative) Explanation of the ignition hazard assessment procedure 25 Annex B (informative) Examples of ignition hazard assessment . 31 Bibliography 37 Figure A.1 Relationship between ignitions source definitions . 26
28、Table A.1 Recommended documentation of initial assessment of equipment related ignition sources. 27 Table A.2 Example for reporting identification of ignition hazards (step 1) and first assessment (step 2) 28 Table A.3 Example for reporting determination of preventive or protective measures (step 3)
29、 and concluding estimation and EPL assignment (step 4) . 29 Table B.1 Common cases demonstrating the use of the reporting method Electrostatic discharge 33 Table B.2 Ignition hazard assessment report for a linear motor with permanent magnets in the table-track, EPL Gb, in addition to the basic requi
30、rements of IEC 60079-0 (for example material characteristics, electrostatic, earthing) 35 4 60079-33 IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 33: Equipment protection by special protection “s” FOREWORD 1) The International Electrotechnical Commission (IEC) is a
31、 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 ot
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37、lication 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 i
38、s 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 te
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40、EC 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 sub
41、ject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-33 has been prepared by IEC technical committee 31: Equipment for explosive atmospheres. The text of this standard is based on the following documents: FDIS Report
42、 on voting 31/997/FDIS 31/1011/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. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60079 series, pub
43、lished under the general title Explosive atmospheres, can be found on the IEC website. 60079-33 IEC:2012 5 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
44、 the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 60079-33 IEC:2012 INTRODUCTION This part of IEC 60079 was created in response to a request from the IECEx certification system to provide a set of requirements to be
45、used for certification within the IECEx product certification scheme when the standards for existing types of protection were not applicable. The present standard refers to the use of one or more independent verifiers, in accordance with ISO/IEC rules on the writing of standards that mitigate agains
46、t specifying particular forms of conformity assessment. The IECEx system will specify how the term “independent verifier“ will be interpreted for the purposes of the scheme. For example, it may specify that in the case of three independent verifiers they shall all be certification body members of th
47、e scheme, each accepted specifically for the purpose of assessing special protection applications and each from a separate member country of the system. The purpose of IEC 60079-33 special protection “s” for any equipment protection level (EPL) is to allow design, assessment and testing of equipment
48、 or parts of equipment that cannot be fully assessed within a recognized type of protection or combination of recognized types of protection because of functional or operational limitations and where the desired equipment protection level can be achieved by the use of this standard. Special protecti
49、on “s” allows a design concept that cannot comply in full with recognized types of protection, or where the design concept is not covered by recognized types of protection. When specification for the equipment includes aspects as given above, additional information and data may be required from technical research, evaluation of existing data and information. Manufacturers should first consider the possibilities for design to the recog
