ANSI UL 60079-18-2012 UL Standard for Safety Explosive atmospheres - Part 18 Equipment protection by encapsulation “m” (Third Edition Reprint with Revisions Through and Including O.pdf

《ANSI UL 60079-18-2012 UL Standard for Safety Explosive atmospheres - Part 18 Equipment protection by encapsulation “m” (Third Edition Reprint with Revisions Through and Including O.pdf》由会员分享，可在线阅读，更多相关《ANSI UL 60079-18-2012 UL Standard for Safety Explosive atmospheres - Part 18 Equipment protection by encapsulation “m” (Third Edition Reprint with Revisions Through and Including O.pdf（52页珍藏版）》请在麦多课文档分享上搜索。

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-18 Explosive atmospheres Part 18: Equipment protection by encapsulation “m”UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL

2、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive atmospheres Part 18: Equipment protection by encapsulation “m”, UL 60079-18 Third Edition, Dated May 31, 2012 Summary of Topics This revision to ANSI/UL 60079-

3、18, the Standard for Safety for Explosive Atmospheres Part 18: Equipment Protection by Encapsulation “m”, is issued to note the September 14, 2012 ANSI approval date of ANSI/ISA 60079-18. As noted in the Commitment for Amendments statement located on the back side of the title page, UL and ISA are c

4、ommitted to updating this bi-national standard jointly. However, the revision pages dated October 5, 2012 will not be issued by ISA as revision pages but as an update to their standard. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical

5、 line in the margin. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warrant

6、y of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or

7、 any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of

8、 the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser i

9、s storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the preface. The prior text for requireme

10、nts that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. OCTOBER 5, 2012 UL 60079-18 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 5,

11、2012 UL 60079-18 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ISA The International Society of Automation ANSI/ISA 60079-18 (12.23.01)-2012 Third Edition Underwriters Laboratories Inc. ANSI/UL 60079-18 Third Editio

12、n Explosive atmospheres Part 18: Equipment protection by encapsulation “m” May 31, 2012 (Title Page Reprinted: October 5, 2012) ANSI/UL 60079-18-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is i

13、ssued jointly by the International Society of Automation (ISA) and Underwriters Laboratories Incorporated (UL). Comments or proposals for revisions on any part of the standard may be submitted to ISA or UL at any time. Revisions to this standard will be made only after processing according to the st

14、andards development procedures of ISA and UL. ISA and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. 978-937560-23-2 Copyright 2012 ISA These materials are subject to copyright claims of IEC, ANSI and ISA. All rights res

15、erved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ISA. All requests pertaining to this Standard should be submitted to ISA. The most recent desig

16、nation of ANSI/ISA 60079-18 as an American National Standard (ANSI) occurred on September 14, 2012. Copyright 2012 Underwriters Laboratories Inc. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and

17、 all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Third edition. The most recent designation of ANSI/UL 60079-18 as an American National Standard (ANSI) occurred on May 31, 2012. ANSI

18、 approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. The National Difference Page and IEC Foreword are also excluded from the ANSI approval of IEC-based standards. Comments or proposals for revisions on any part of the Standard may

19、 be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

20、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS General Notes 4 Preface (ISA) .5 National Differences 9 FOREWORD . 10 1 Scope 12 2 Normative references .12 3 Terms and denitions 14 4 General .16 4.1 Level of protection (Equipment protection level (EPL) .16 4.2 Additional requirement

21、s for level of protection “ma” 16 4.3 Rated voltage and prospective short circuit current 17 5 Requirements for compounds .17 5.1 General 17 5.2 Specication 17 5.3 Properties of the compound 18 6 Temperatures .18 6.1 General 18 6.2 Determination of the limiting temperature .19 6.3 Temperature limita

22、tion .19 7 Constructional requirements .19 7.1 General 19 7.2 Determination of faults .20 7.3 Free space in the encapsulation .22 7.4 Thickness of the compound 25 7.5 Switching contacts .28 7.6 External connections .29 7.7 Protection of bare live parts .30 7.8 Cells and batteries .30 7.9 Protective

23、devices .33 8 Type tests 36 8.1 Tests on the compound 36 8.2 Tests on the apparatus 37 9 Routine verications and tests .42 9.1 Visual inspections .42 9.2 Dielectric strength test .42 10 Marking 43 Annex A (informative) Basic requirements for compounds for “m” equipment Annex B (normative) Allocation

24、 of test samples Bibliography MAY 31, 2012 ANSI/ISA 60079-18 (12.23.01)-2012 ANSI/UL 60079-18 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL General Notes This is the common ISA and UL standard for Explosive atmospheres Part 18: Equipment

25、of protection by encapsulation “m”. It is the third edition of ISA-60079-18 and the third edition of UL 60079-18. This document is a modication of IEC 60079-18 (2009:05) Ed. 3.0, incorporating IEC 60079-18 Corr.1 (2009:06) Ed. 3.0, and includes US deviations encompassing both additions and deletions

26、 of information. ISA-60079-18 and UL 60079-18 contain identical requirements, and identical publication dates. The presentation and format of the standards material may differ between the two published standards. This common standard was prepared by ISA and Underwriters Laboratories Inc. (UL). Altho

27、ugh the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose. Level of harmonization This standard adopts the IEC text and corrigendum with d

28、eviations. The requirements are presented in different formats. The ISA version of the standard illustrates the national differences from the IEC text through the use of legislative text (strike-out and underline). The UL version of the standard illustrates national differences immediately following

29、 the IEC text. National differences between the UL version and the ISA version shall be word for word except for editorial changes. Interpretations The interpretation by the SDO of an identical or equivalent standard shall be based on the literal text to determine compliance with the standard in acc

30、ordance with the procedural rules of the SDO. If more than one interpretation of the literal text has been identied, a revision shall be proposed as soon as possible to each of the SDOs to more accurately reect the intent. UL Effective Date As of May 31, 2012, all products Listed or Recognized by UL

31、 must comply with the requirements in this standard. MAY 31, 2012 ANSI/ISA 60079-18 (12.23.01)-2012 ANSI/UL 60079-18 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface (ISA) This ISA standard is based on the third edition of IEC Public

32、ation 60079-18. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-18 to the fullest extent possible. This preface is included for informational purposes and is not part of ISA 60079-18. The document is a modication of the IEC document and includ

33、es U.S. deviations encompassing both additions and deletions of information. The signicant changes with respect to the previous edition are listed below: Incorporation of level of protection “mc” Equipment protection levels (EPL Ga, Da, Gb, Db, Gc, Dc) Incorporation of the dust requirements Incorpor

34、ation of switching contacts for level of protection “ma” Water absorption test methodology The standards referenced within this document may contain provisions which, through reference in this text, constitute requirements of this document. At the time of publication, the editions indicated were val

35、id. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the most recent editions of the standards indicated within this document. Members of IEC and ISO maintain registers of currently valid International S

36、tandards. ANSI maintains registers of currently valid U.S. National Standards. This document has been prepared as part of the service of ISA, toward a goal of uniformity in the eld of instrumentation. To be of real value, this document should not be static but should be subject to periodic review. T

37、oward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-8411; Fax (919) 549-8288; E-mail: standardsisa.org. The IS

38、A Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the benets to USA users of ISA stand

39、ards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavour to introduce SI-acceptable metric units in all new and revised standards, recommended practices, and technical

40、 reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing & Materials as IEEE/ASTM SI 10-97, and future revisions, will be the reference guide for denitions, symbols, abbreviations, an

41、d conversion factors. It is the policy of ISA to encourage and welcome the participation of all concerned individuals and interests in the development of ISA standards, recommended practices, and technical reports. Participation in the ISA standards-making process by an individual in no way constitu

42、tes endorsement by the employer of that individual, of ISA, or of any of the standards, recommended practices, and technical reports that ISA develops. MAY 31, 2012 ANSI/ISA 60079-18 (12.23.01)-2012 ANSI/UL 60079-18 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WIT

43、HOUT PERMISSION FROM UL CAUTION ISA DOES NOT TAKE ANY POSITION WITH RESPECT TO THE EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS ASSERTED IN CONNECTION WITH THIS DOCUMENT, AND ISA DISCLAIMS LIABILITY FOR THE INFRINGEMENT OF ANY PATENT RESULTING FROM THE USE OF THIS DOCUMENT. USERS ARE ADVISED THAT DETE

44、RMINATION OF THE VALIDITY OF ANY PATENT RIGHTS, AND THE RISK OF INFRINGEMENT OF SUCH RIGHTS, IS ENTIRELY THEIR OWN RESPONSIBILITY. PURSUANT TO ISAS PATENT POLICY, ONE OR MORE PATENT HOLDERS OR PATENT APPLICANTS MAY HAVE DISCLOSED PATENTS THAT COULD BE INFRINGED BY USE OF THIS DOCUMENT AND EXECUTED A

45、 LETTER OF ASSURANCE COMMITTING TO THE GRANTING OF A LICENSE ON A WORLDWIDE, NON-DISCRIMINATORY BASIS, WITH A FAIR AND REASONABLE ROYALTY RATE AND FAIR AND REASONABLE TERMS AND CONDITIONS. FOR MORE INFORMATION ON SUCH DISCLOSURES AND LETTERS OF ASSURANCE, CONTACT ISA OR VISIT WWW.ISA.ORG/STANDARDSPA

46、TENTS. OTHER PATENTS OR PATENT CLAIMS MAY EXIST FOR WHICH A DISCLOSURE OR LETTER OF ASSURANCE HAS NOT BEEN RECEIVED. ISA IS NOT RESPONSIBLE FOR IDENTIFYING PATENTS OR PATENT APPLICATIONS FOR WHICH A LICENSE MAY BE REQUIRED, FOR CONDUCTING INQUIRIES INTO THE LEGAL VALIDITY OR SCOPE OF PATENTS, OR DET

47、ERMINING WHETHER ANY LICENSING TERMS OR CONDITIONS PROVIDED IN CONNECTION WITH SUBMISSION OF A LETTER OF ASSURANCE, IF ANY, OR IN ANY LICENSING AGREEMENTS ARE REASONABLE OR NON-DISCRIMINATORY. ISA REQUESTS THAT ANYONE REVIEWING THIS DOCUMENT WHO IS AWARE OF ANY PATENTS THAT MAY IMPACT IMPLEMENTATION

48、 OF THE DOCUMENT NOTIFY THE ISA STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER. ADDITIONALLY, THE USE OF THIS DOCUMENT MAY INVOLVE HAZARDOUS MATERIALS, OPERATIONS OR EQUIPMENT. THE DOCUMENT CANNOT ANTICIPATE ALL POSSIBLE APPLICATIONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED W

49、ITH USE IN HAZARDOUS CONDITIONS. THE USER OF THIS DOCUMENT MUST EXERCISE SOUND PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USERS PARTICULAR CIRCUMSTANCES. THE USER MUST ALSO CONSIDER THE APPLICABILITY OF ANY GOVERNMENTAL REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH PRACTICES BEFORE IMPLEMENTING THIS DOCUMENT. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. THE