UL 60079-7-2008 UL Standard for Safety Explosive Atmospheres - Part 7 Equipment protection by increased safety e (Fourth Edition Reprint with Revisions through and Including May .pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-7 Explosive Atmospheres Part 7: Equipment protection by increased safety e 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 7: Equipment protection by increased safety e , UL 60079-7 Fourth Edition, Dated October 15, 2008 Summary of Topics This revision to ANSI/UL 6

3、0079-7 is being issued to reect the reaffirmation of ANSI approval. No changes in requirements have been made. As noted in the Commitment for Amendments statement located on the back side of the title page, UL and ISA are committed to updating this bi-national standard jointly. However, the revision

4、 pages dated May 31, 2013 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 line in the margin. The revised requirements are substantially in accordance wi

5、th Proposal(s) on this subject dated November 30, 2012. 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

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10、eface. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. MAY 31, 2013 UL 60079-7 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT

11、 PERMISSION FROM UL MAY 31, 2013 UL 60079-7 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ISA The Instrumentation, Systems, and Automation Society ANSI/ISA 60079-7 (12.16.01)-2008 (R2013) Second Edition Underwriters

12、 Laboratories Inc. UL 60079-7 Fourth Edition Explosive Atmospheres Part 7: Equipment protection by increased safety e October 15, 2008 (Title Page Reprinted: May 31, 2013) ANSI/UL 60079-7-2008 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F

13、ROM UL Commitment for Amendments This Standard is issued jointly by The Instrumentation, Systems, and Automation Society (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

14、 standard will be made only after processing according to the standards 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. UL and ISA are separate and independent entities and ea

15、ch is solely responsible for its operations and business activities. The UL trade names and trademarks depicted in this document are the sole property of Underwriters Laboratories Inc. (UL). The ISA trade names and trademarks depicted in this document are the sole property of ISA The Instrumentation

16、, Systems and Automation Society. ISBN 978-0-876640-23-4 Copyright 2013 ISA These materials are subject to copyright claims of IEC, ANSI, and ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced in any form, including an ele

17、ctronic retrieval system, without the prior written permission of ISA. All requests pertaining to this Standard should be submitted to ISA. Copyright 2013 Underwriters Laboratories Inc. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be alte

18、red in any way. All of ULs Standards and 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 Fourth Edition including revisions through May 31, 2013. The most recent designation of ANSI/

19、ISA 600797 and ANSI/UL 60079-7 as a Reaffirmed American National Standard (ANS) occurred on May 31, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. The National Difference Page and IEC Foreword are also excluded from t

20、he ANSI approval of IEC-based standards. Any other portions of this ANSI/UL standard that were not processed in accordance with ANSI/UL requirements are noted at the beginning of the impacted sections. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time

21、. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. 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 all copyrights

22、, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS General Notes 6 Preface (ISA) .7 National Differences . 11 FOREWORD . 12 1 Scope 1

23、4 2 Normative references .14 3 Terms and denitions 20 4 Constructional requirements for all electrical apparatus .23 4.1 General 23 4.2 Electrical connections 23 4.3 Clearances .28 4.4 Creepage distances .33 4.5 Solid electrical insulating materials 35 4.6 Windings .35 4.7 Temperature limitations 36

24、 4.8 Wiring internal to apparatus .38 4.9 Degrees of protection provided by enclosures .38 4.10 Fasteners .39 5 Supplementary requirements for specic electrical apparatus 39 5.1 General 39 5.2 Rotating electrical machines 40 5.3 Luminaires 47 5.4 Caplights and handlights .53 5.5 Measuring instrument

25、s and instrument transformers .54 5.6 Transformers other than instrument transformers 55 5.7 Batteries .55 5.8 General purpose connection and junction boxes 62 5.9 Resistance heaters (other than trace heaters) .62 5.10 Other electrical apparatus .66 6 Type verications and type tests .66 6.1 Dielectr

26、ic strength .66 6.2 Rotating electrical machines 67 6.3 Luminaires designed for mains supply .69 6.4 Measuring instruments and instrument transformers .72 6.5 Transformers other than instrument transformers 72 6.6 Secondary batteries .73 6.7 General purpose connection and junction boxes 76 6.8 Resis

27、tance heating devices and resistance heating units .77 6.9 Terminal insulating material tests 78 7 Routine verications and routine tests 80 7.1 Dielectric tests 80 7.2 Dielectric tests for batteries .80 7.3 Inter-turn overvoltage tests .80 8 Ex component certicates .80 8.1 General 80 8.2 Terminals .

28、80 OCTOBER 15, 2008 ANSI/ISA 12.16.01-2008 UL 60079-7 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 9 Marking and instructions .81 9.1 General marking 81 9.2 Instructions for use 82 9.3 Warning markings .84 Annex A (normative) Cage motors

29、 Methods of test and of calculation Annex B (normative) Type tests for specic forms of resistance heating devices or resistance heating units (other than trace heater) B.1 Resistance heating devices subjected to mechanical stresses .88 B.2 Resistance heating devices or units intended for immersion .

30、88 B.3 Resistance heating devices or units having hygroscopic insulating material .88 B.4 Verication of limiting temperature of resistance heating devices (other than trace heaters) .88 Annex C (informative) Cage motors Thermal protection in service Annex D (informative) Resistance heating devices a

31、nd units Additional electrical protection D.1 Objective .91 D.2 Method of protection .91 Annex E (informative) Combinations of terminals and conductors for general purpose connection and junction boxes E.1 General .92 E.2 Maximum dissipated power method 92 E.3 Dened arrangement method 92 Annex F (in

32、formative) Dimensions of copper conductors Annex G (informative) Potential stator winding discharge risk assessment Ignition risk factors Annex H (normative) Test procedure for T8, T10 and T12 lamps H.1 Asymmetric pulse test 96 H.1.1 General 96 H.1.2 Test procedure 96 H.2 Asymmetric power test .99 H

33、.2.1 General 99 H.2.2 Test procedure 99 OCTOBER 15, 2008 ANSI/ISA 12.16.01-2008 UL 60079-7 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex I (informative) Introduction of an alternative risk assessment method encompassing Equipment Pr

34、otection Levels for Ex Equipment I.1 Historical Background 102 I.2 Introduction .103 I.2.1 Coal Mining (Group I): .103 I.2.2 Gases (Group II): .103 I.2.3 Dusts (Group III): 104 I.3 Risk of ignition protection afforded .105 I.4 Implementation 105 Bibliography OCTOBER 15, 2008 ANSI/ISA 12.16.01-2008 U

35、L 60079-7 5UL 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 7: Equipment protection by increased safety e . It is the fourth edition of ANSI/ISA 60079-7 and t

36、he fourth edition of ANSI/UL 60079-7. The document is a modication of the IEC document and includes U.S. deviations encompassing both additions and deletions of information. ANSI/ISA 60079-7 and ANSI/UL 60079-7 contain identical requirements, and identical publication dates. The presentation and for

37、mat of the standards material may differ between the two published standards. This common Standard was prepared by ISA The Instrumentation, Systems, and Automation Society and Underwriters Laboratories Inc. (UL). Note: Although the intended primary application of this Standard is stated in its Scope

38、, 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 with national differences. The requirements are presented in different formats. The ISA version of

39、 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 the IEC text. National differences between the UL version and the ISA version sha

40、ll 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 accordance with the procedural rules of the SDO. If more than one interpretation of t

41、he 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 The requirements in this standard are effective October 15, 2011 A UL effective date is one established by Underwriters Laboratories Inc. and

42、 is not part of the ANSI approved standard. MAY 31, 2013 ANSI/ISA 12.16.01-2008 UL 60079-7 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface (ISA) This ISA standard is based on IEC Publication 60079-7. It is the intention of the ISA12

43、 Committee to develop an ANSI Standard that is harmonized with IEC 60079-7 to the fullest extent possible. This preface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-60079-7 (12.16.01)-2008 (R2013). The standards referenced within this docume

44、nt may contain provisions which, through reference in this text, constitute requirements of this document. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibil

45、ity of applying the most recent editions of the standards indicated within this document. Members of IEC and ISO maintain registers of currently valid International Standards. ANSI maintains registers of currently valid U.S. National Standards. This document has been prepared as part of the service

46、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. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practi

47、ces 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 ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the Inter

48、national 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 standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other coun

49、tries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and revised standards, recommended practices, and technical 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