1、 IEC 60079-6 Edition 4.0 2015-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 6: Equipment protection by liquid immersion “o“ Atmosphres explosives Partie 6: Protection du matriel par immersion dans le liquide “o“ IEC 60079-6:2015-02(en-fr) THIS PUBLICATION IS COPYRIGHT PRO
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19、mentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60079-6 Edition 4.0 2015-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 6: Equipment protection by liquid immersion “o“ Atmosphres explosives Partie 6: Protection du matriel par im
20、mersion dans le liquide “o“ INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.260.20 ISBN 978-2-8322-2251-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure
21、 that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60079-6:2015 IEC 2015 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references. 6 3 Terms and definitions 7 4 Constructional requir
22、ements 8 4.1 General . 8 4.2 Levels of protection and requirements of electrical equipment 8 4.2.1 Level of Protection . 8 4.2.2 Requirements for Level of Protection “ob” . 9 4.2.3 Requirements for Level of Protection “oc” . 9 4.3 Switching device . 9 4.4 Creepage and clearance . 9 4.5 Liquid contai
23、nment enclosures. 10 4.5.1 General . 10 4.5.2 Sealed enclosures . 10 4.5.3 Unsealed enclosures 10 4.5.4 Outlet of breathing device or pressure relief device . 10 4.5.5 Enclosures intended to be opened 10 4.5.6 Determination of the maximum/minimum criteria of the protective liquid 10 4.6 Immersion de
24、pth . 11 4.7 Protective liquid level indication . 11 4.7.1 General . 11 4.7.2 Remote-indicating protective liquid level indicator . 12 4.7.3 Safety devices for Level of Protection “ob” 12 4.8 Temperature limitations . 12 4.8.1 General . 12 4.8.2 Maximum Surface Temperature 12 4.8.3 Flashpoint of the
25、 protective liquid . 12 4.9 Field wiring connections to liquid immersion equipment 12 4.10 Constructional elements of enclosures 12 4.10.1 Operating rods, shafts etc. . 12 4.10.2 Devices for draining of liquid 13 5 Protective Liquid 13 5.1 Protective liquid specification 13 5.2 Detailed alternative
26、specification . 13 5.3 Group I equipment 13 5.4 Liquid contamination and gassing that may result from arcing 13 5.5 Total volume of the protective liquid. 14 6 Verifications and tests . 14 6.1 Type tests . 14 6.1.1 Overpressure test on sealed enclosures . 14 6.1.2 Reduced pressure test on sealed enc
27、losures 14 6.1.3 Overpressure test on unsealed enclosures . 14 6.1.4 Maximum temperature 14 6.1.5 Switching Tests 15 6.2 Routine tests . 15 IEC 60079-6:2015 IEC 2015 3 6.2.1 Sealed enclosures . 15 6.2.2 Unsealed enclosures 15 7 Marking . 15 8 Instructions 16 Annex A (normative) Selection and erectio
28、n requirements 17 Annex B (normative) Maintenance requirements . 18 Annex C (normative) Repair and Overhaul requirements . 19 Bibliography . 20 Table 1 Working voltage . 9 Table 2 Depth of immersion . 11 Table B.1 Inspection requirements . 18 4 IEC 60079-6:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICA
29、L COMMISSION _ EXPLOSIVE ATMOSPHERES Part 6: Equipment protection by liquid immersion “o“ 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 i
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37、ion 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 dir
38、ect 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 indispens
39、able 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. International Standard IEC 60079-6 ha
40、s been prepared by IEC technical committee 31: Equipment for explosive atmospheres. This fourth edition cancels and replaces the third edition, published in 2007. This edition constitutes a technical revision. The significant changes with respect to the previous edition are listed below: Edition 4 r
41、epresents a major technical revision of the requirements for oil immersion “o” and should be considered as introducing all new requirements. The normal “Table of Significant Changes” has not been included for this reason. In particular: The requirements for oil immersion “o” have been redefined into
42、 liquid immersion , levels of protection “ob” and “oc” as recommended by the responses to 31/715/DC The ability to protect sparking contacts has been added to both “ob” and “oc” Additional requirements have been introduced for the protective liquid. IEC 60079-6:2015 IEC 2015 5 This part of IEC 60079
43、 is to be used in conjunction with IEC 60079-0, Explosive atmospheres Part 0: Equipment General requirements. The text of this standard is based on the following documents: FDIS Report on voting 31/1157/FDIS 31/1172/RVD Full information on the voting for the approval of this standard can be found in
44、 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, under the general title Explosive atmospheres, can be found on the IEC website. The committee has decided that the con
45、tents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC 60079-6:
46、2015 IEC 2015 EXPLOSIVE ATMOSPHERES Part 6: Equipment protection by liquid immersion “o“ 1 Scope This part of IEC 60079 specifies the requirements for the design, construction, testing and marking of Ex Equipment and Ex Components with type of protection liquid immersion “o” intended for use in expl
47、osive gas atmospheres. Ex Equipment and Ex Components of type of protection liquid immersion “o” are either: Level of Protection “ob” (EPL “Mb” or “Gb”) Level of Protection “oc” (EPL “Gc”) For Level of Protection “ob”, this standard applies where the rated voltage does not exceed 11 kV r.m.s. a.c. o
48、r d.c. For Level of Protection “oc”, this standard applies where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c. NOTE Requirements for higher voltages are under consideration. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this stan
49、dard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. 2 Normative references 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. IEC 6
