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
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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
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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
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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
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