UL 60079-11-2013 UL Standard for Safety Explosive Atmospheres C Part 11 Equipment Protection by Intrinsic Safety i (Sixth Edition Reprint with Revisions Through and Including Mar_1.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-11 Explosive Atmospheres Part 11: Equipment Protection by Intrinsic Safety i UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULU

2、L COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive Atmospheres Part 11: Equipment Protection by Intrinsic Safety “i”, UL 60079-11 Sixth Edition, Dated February 15, 2013 Summary of Topics This revision to ANSI

3、/UL 60079-11 is an adoption of IEC 60079-11, the Standard for Safety for Explosive Atmospheres Part 11: Equipment Protection by Intrinsic Safety i , is being issued to incorporate the following: Revisions to Update ANSI/UL 2481 References Clarication of Figure 2 Revisions for Non-Intrinsically Safe

4、Circuit Connections of Galvanically Separating Components 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 pages dated March 28, 2014 will not be issued by ISA

5、 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 new requirements are substantially in accordance with Proposal(s) on this subject dated August 16, 2013 an

6、d January 24, 2014. 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 warranty

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10、 storing an electronic Standard on the purchasers computer system. THE STANDARDS TECHNICAL PANEL FOR UL 60079-11 HAS DETERMINED THAT AS OF SEPTEMBER 1, 2018, EDITION 5 OF UL 60079-11 WILL BE WITHDRAWN AND MAY BE USED TO DETERMINE A PRODUCTS COMPLIANCE UNTIL THIS DATE. The following table summarizes

11、the active editions of UL 60079-11, and lists the established withdrawal date for each edition of this standard. MARCH 28, 2014 UL 60079-11 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Standard Edition Status of Edition (Active/Withdra

12、wn) Established Withdrawal Date for Each Standard Edition 5 Active September 1, 2018 6 Active Active until further notice Note: These editions may be used to determine compliance for new or modied products until the dates shown. When the Standards Technical Panel has determined that all existing pro

13、ducts shall be upgraded and assessed for compliance with a new standard edition, the edition number will be noted with an “*” in this table. MARCH 28, 2014 UL 60079-11 tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ISA The International

14、Society of Automation ANSI/ISA 60079-11 (12.02.01)-2014 Edition 6.2 Underwriters Laboratories Inc. ANSI/UL 60079-11 Sixth Edition Explosive Atmospheres Part 11: Equipment Protection by Intrinsic Safety i February 15, 2013 (Title Page Reprinted: March 28, 2014) ANSI/UL 60079-11-2014UL COPYRIGHTED MAT

15、ERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by ISA and Underwriters Laboratories Incorporated (UL). Comments or proposals for revisions on any part of this standard may be submitted to ISA or UL at

16、 any time. Revisions to this 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. ISBN 978-0-87664-08-14 Copy

17、right 2014 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 electronic retrieval system, without the prior written permission

18、 of ISA. All requests pertaining to this standard should be submitted to ISA. The most recent designation of ANSI/ISA 60079-11 as an American National Standard (ANSI) occurred on March 28, 2014. Copyright 2014 Underwriters Laboratories Inc. ULs Standards for Safety are copyrighted by UL. Neither a p

19、rinted nor electronic copy of a Standard should be altered 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 Sixth edition including revisions thro

20、ugh March 28, 2014. The most recent designation of ANSI/UL 60079-11 as an American National Standard (ANSI) occurred on March 28, 2014. ANSI 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 F

21、oreword are also excluded from the ANSI approval of IEC-based standards. Comments or proposals for revisions on any part of the Standard may 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:/

22、. 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 REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS General Notes 6 Preface (ISA) .7 National Differences . 11 FOREWORD . 12 1 Scope 14 2 Normative

23、 references .24 3 Terms and denitions 26 4 Grouping and classication of intrinsically safe apparatus and associated apparatus .30 5 Levels of protection and ignition compliance requirements of electrical apparatus 30 5.1 General 30 5.2 Level of protection ia .31 5.3 Level of protection ib .32 5.4 Le

24、vel of protection ic .32 5.5 Spark ignition compliance 33 5.6 Thermal ignition compliance 33 5.7 Simple apparatus 37 6 Apparatus construction .38 6.1 Enclosures .38 6.2 Facilities for connection of external circuits .40 6.3 Separation distances 46 6.4 Protection against polarity reversal 58 6.5 Eart

25、h conductors, connections and terminals .59 6.6 Encapsulation .60 7 Components on which intrinsic safety depends 61 7.1 Rating of components 61 7.2 Connectors for internal connections, plug-in cards and components .62 7.3 Fuses 62 7.4 Primary and secondary cells and batteries 64 7.5 Semiconductors .

26、68 7.5.3.1DV.1 Blocking Devices 69 7.6 Failure of components, connections and separations 70 7.7 Piezo-electric devices 71 7.8 Electrochemical cells for the detection of gases .72 8 Infallible components, infallible assemblies of components and infallible connections on which intrinsic safety depend

27、s .72 8.1 Level of Protection “ic” .72 8.2 Mains transformers 72 8.3 Transformers other than mains transformers 74 8.4 Infallible windings 75 8.5 Current-limiting resistors 76 8.6 Capacitors 76 8.7 Shunt safety assemblies .77 8.8 Wiring, printed circuit board tracks, and connections .78 8.9 Galvanic

28、ally separating components .80 9 Supplementary requirements for specic apparatus 81 9.1 Diode safety barriers .81 FEBRUARY 15, 2013 ANSI/ISA 60079-11 (12.02.01)-2012 ANSI/UL 60079-11 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 9.2 FISCO

29、 apparatus 82 9.3 Handlights and caplights .82 10 Type verications and type tests 82 10.1 Spark ignition test 82 10.2 Temperature tests 88 10.3 Dielectric strength tests .89 10.4 Determination of parameters of loosely specied components .90 10.5 Tests for cells and batteries .90 10.6 Mechanical test

30、s .92 10.7 Tests for intrinsically safe apparatus containing piezoelectric devices .93 10.8 Type tests for diode safety barriers and safety shunts 94 10.9 Cable pull test .94 10.10 Transformer tests .95 10.11 Optical isolators tests 95 10.12 Current carrying capacity of infallible printed circuit bo

31、ard connections .98 11 Routine verications and tests 98 11.1 Routine tests for diode safety barriers 98 11.2 Routine tests for infallible transformers 99 12 Marking 99 12.1 General .99 12.2 Marking of connection facilities 101 12.3 Warning markings .101 12.4 Examples of marking 101 13 Documentation

32、103 Annex A (normative) Assessment of intrinsically safe circuits A.1 Basic criteria .105 A.2 Assessment using reference curves and tables .105 A.3 Examples of simple circuits 106 A.4 Permitted reduction of effective capacitance when protected by a series resistance .130 Annex B (normative) Spark te

33、st apparatus for intrinsically safe circuits B.1 Test methods for spark ignition .132 B.1.1 Principle .132 B.1.2 Apparatus .132 B.1.3 Calibration of spark test apparatus .133 B.1.4 Preparation and cleaning of tungsten wires 134 B.1.5 Conditioning a new cadmium disc 134 B.1.6 Limitations of the appar

34、atus .135 B.1.7 Modications of test apparatus for use at higher currents 135 Annex C (informative) Measurement of creepage distances, clearances and separation distances through casting compound and through solid insulation C.1 Clearances and separation distances through casting compound and through

35、 solid insulation .141 C.2 Creepage distances .143 FEBRUARY 15, 2013 ANSI/ISA 60079-11 (12.02.01)-2012 ANSI/UL 60079-11 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex D (normative) Encapsulation D.1 Adherence .145 D.2 Temperature .14

36、5 Annex E (informative) Transient energy test E.1 Principle .151 E.2 Test .151 Annex F (normative) Alternative separation distances for assembled printed circuit boards and separation of components F.1 General 154 F.2 Control of pollution access .154 F.3 Distances for printed circuit boards and sepa

37、ration of components 155 F.3.1 Levels of protection ia and ib .155 F.3.2 Level of protection ”ic” 156 Annex G (normative) Fieldbus intrinsically safe concept (FISCO) Apparatus requirements G.1 Overview 158 G.2 Apparatus requirements .158 G.2.1 General .158 G.2.2 FISCO power supplies 158 G.3 FISCO el

38、d devices .159 G.3.1 General .159 G.3.2 Additional requirements of ia and ib FISCO eld devices 160 G.3.3 Additional requirement of ic FISCO eld devices 160 G.3.4 Terminator 160 G.3.5 Simple apparatus 161 G.4 Marking .161 G.4.1 Examples of marking .161 Annex H (informative) Ignition testing of semico

39、nductor limiting power supply circuits H.1 Overview 164 H.2 Test .165 Annex DVI (informative) Explanatory guide for the application of ic DVI.1 General .170B Bibliography SEPTEMBER 6, 2013 ANSI/ISA 60079-11 (12.02.01)-2012 ANSI/UL 60079-11 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUC

40、TION OR DISTRIBUTION WITHOUT PERMISSION FROM UL General Notes This is the common ISA and UL Standard for Explosive Atmospheres Part 11: Equipment Protection by Intrinsic Safety “i”. It is edition 6.2 of ANSI/ISA-60079-11 (superseding ANSI/ISA-60079-11-2013) and edition 6 of ANSI/UL 60079-11. This do

41、cument is a modication of the IEC document and includes US deviations encompassing both additions and deletions of information. ANSI/ISA 60079-11 and ANSI/UL 60079-11 contain identical requirements, and the identical publication dates. The presentation and format of the standards material may differ

42、 between the two published standards. This common standard was prepared by ISA and Underwriters Laboratories Inc. (UL). Note: Although 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

43、judge its suitability for their particular purpose. Level of harmonization This standard adopts the IEC text with deviations. 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 tex

44、t (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 shall be word for word except for editorial changes. Interpretations The interpretation by the SDO of an i

45、dentical 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 the literal text has been identied, a revision shall be proposed as soon as possible to each of the SDOs

46、 to more accurately reect the intent. UL Effective Date The effective date for UL is the date of publication. However, the fth edition of UL 60079-11 will also be effective until September 1, 2018. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI a

47、pproved standard. MARCH 28, 2014 ANSI/ISA 60079-11 (12.02.01)-2012 ANSI/UL 60079-11 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface (ISA) This ISA standard is based on the Sixth edition of IEC Publication 60079-11 including Corrigen

48、dum 1. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-11 to the fullest extent possible. This preface is included for informational purposes and is not part of ISA 60079-11. The document is a modication of the IEC document and includes U.S. d

49、eviations encompassing both additions and deletions of information. The entire text of IEC 60079-11:2011 is included in this document including Corrigendum 1. U.S. National Deviations are shown by strikeout through deleted text and underlining of added text. Tables, or portions of tables, that are to be deleted are shown as shaded; gures to be deleted are marked with the overlay X. Some