ANSI UL 60079-1-2009 UL Standard for Safety Explosive Atmospheres C Part 1 Equipment Protection by Flameproof Enclosures d (Sixth Edition Reprint with Revisions Through and Includi.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-1 Explosive Atmospheres Part 1: Equipment Protection by Flameproof Enclosures “d”UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM

2、 ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive Atmospheres Part 1: Equipment Protection by Flameproof Enclosures “d”, UL 60079-1 Sixth Edition, Dated April 10, 2009 Summary of Topics This revision to

3、ANSI/UL 60079-1 is being issued to update the title page 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 stand

4、ard jointly. However, the revision pages dated August 9, 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. These revisions are sub

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10、as indicated in the preface. 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that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. AUGUST 9, 2013 UL 60079-1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION

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12、rwriters Laboratories Inc. ANSI/UL 60079-1 Sixth Edition Explosive Atmospheres Part 1: Equipment Protection by Flameproof Enclosures “d” April 10, 2009 (Title Page Reprinted: August 9, 2013) ANSI/UL 60079-1-2009 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION W

13、ITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued 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 t

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21、EPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS General Notes 6 Preface (ISA) .7 National Differences . 11 FOREWORD . 12 1 Scope 15 2 Normative references .15 3 Terms and denitions 19 4 Equipment grouping and temperature classication 20 5 Flameproof joints 21 5.1 General requirements

22、 21 5.2 Non-threaded joints 22 5.3 Threaded joints .33 5.4 Gaskets (including O-rings) .33 5.5 Equipment using capillaries .38 6 Cemented joints .38 6.1 General 38 6.2 Mechanical strength .38 6.3 Width of cemented joints .38 7 Operating rods 38 8 Supplementary requirements for shafts and bearings .3

23、9 8.1 Joints of shafts 39 8.2 Bearings .42 9 Light-transmitting parts .43 10 Breathing and draining devices which form part of a ameproof enclosure .43 10.1 Openings for breathing or draining .43 10.2 Composition limits 44 10.3 Dimensions 44 10.4 Elements with measurable paths .44 10.5 Elements with

24、 non-measurable paths .44 10.6 Removable devices .44 10.7 Mounting arrangements of the elements 45 10.8 Mechanical strength 45 10.9 Breathing devices and draining devices when used as Ex components .45 11 Fasteners, associated holes and blanking elements .50 12 Materials and mechanical strength of e

25、nclosures Materials inside the enclosures .55 13 Entries for ameproof enclosures .56 13.1 Cable glands 57 13.2 Conduit sealing devices .58 13.3 Plugs and sockets and cable couplers 59 13.4 Bushings 60 14 Verication and tests 60 15 Type tests .61 15.1 Tests of ability of the enclosure to withstand pr

26、essure 61 15.2 Test for non-transmission of an internal ignition 66 15.3 (Reserved for future use) 71 15.4 Tests of ameproof enclosures with breathing and draining devices 71 APRIL 10, 2009 ANSI/ISA 60079-1 (12.22.01)-2009 ANSI/UL 60079-1 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT

27、ION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 16 Routine tests .73 17 Switchgear for group I .74 17.1 Means of isolation 74 17.2 Doors or covers 75 18 Lampholders and Iamp caps .75 18.1 Device preventing lamps working loose .75 18.2 Holders and caps for lamps with cylindrical caps .76 18.3 Holders

28、for lamps with threaded caps .76 19 Non-metallic enclosures and non-metallic parts of enclosures 76 19.1 (Reserved for future use) 76 19.2 Special constructional requirements 76 19.3 Supplementary requirements for type tests 77 20 Marking 78 20.1 General .78 20.2 Caution and warning markings .78 20.

29、3 Informative markings 79 Annex A (normative) Additional requirements for crimped ribbon elements and multiple screen elements of breathing and draining devices Annex B (normative) Additional requirements for elements, with non-measurable paths, of breathing and draining devices B.1 Sintered metal e

30、lements 81 B.2 Pressed metal wire elements 81 B.3 Metal foam elements .82 Annex C (normative) Additional requirements for ameproof entry devices C.1 General .83 C.2 Constructional requirements .83 C.2.1 Sealing methods 83 C.2.2 Threads 85 C.2.3 Constructional requirements for Ex blanking elements .8

31、5 C.2.4 Constructional requirements for Ex thread adapters .86 C.3 Type tests 86 C.3.1 Sealing test .86 C.3.2 Test of mechanical strength 88 C.3.3 Type tests for Ex blanking elements .89 C.3.4 Type tests for Ex thread adapters .90 Annex D (normative) Empty ameproof enclosures as Ex components D.1 Ge

32、neral .93 D.2 Introductory remarks .93 D.3 Ex component enclosure requirements .93 D.4 Utilization of an Ex component enclosure certicate to prepare an equipment certicate 96 D.4.1 Procedure 96 D.4.2 Application of the schedule of limitations .97 APRIL 10, 2009 ANSI/ISA 60079-1 (12.22.01)-2009 ANSI/

33、UL 60079-1 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex E (normative) Cells and batteries used in ameproof “d” enclosures E.1 Introductory remarks .98 E.2 Acceptable electrochemical systems .98 E.3 General requirements for cells (o

34、r batteries) inside ameproof enclosures 99 E.4 Arrangement of safety devices .99 E.4.1 Prevention of excessive temperature and cell damage .99 E.4.2 Prevention of cell polarity reversal or reverse charging by another cell in the same battery 100 E.4.3 Prevention of inadvertent charging of a battery

35、by other voltage sources in the enclosure 101 E.5 Recharging of secondary cells inside ameproof enclosures .102 E.6 Rating of protection diodes and reliability of protection devices .103 Annex F (informative) Mechanical properties for screws and nuts Annex G (informative) Introduction of an alternat

36、ive risk assessment method encompassing “equipment protection levels for Ex equipment G.0 Introduction 105 G.1 Historical background .105 G.2 General .106 G.2.1 Coal mining (group I) .106 G.2.2 Gases (group II) .106 G.2.3 Dusts (group III) 107 G.3 Risk of ignition protection afforded 108 G.4 Impleme

37、ntation .108 Bibliography APRIL 10, 2009 ANSI/ISA 60079-1 (12.22.01)-2009 ANSI/UL 60079-1 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 1: Equipment Prote

38、ction by Flameproof Enclosures “d”. It is the sixth edition of ANSI/ISA-60079-1 (superceding ANSI/ISA-12.22.01)-2005 and the Sixth edition of ANSI/UL 60079-1. The document is a modication of the IEC document and includes U.S. deviations encompassing both additions and deletions of information. ANSI/

39、ISA-60079-1 and ANSI/UL 60079-1 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 the International Society of Automation (ISA) and Underwriters L

40、aboratories Inc. (UL). 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 judge its suitability for their particular purpose. Level of harmonization This standard adopts the IEC

41、 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 text (strike-out and underline). The UL version of the standard illustrates national differences immediate

42、ly 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 identical or equivalent standard shall be based on the literal text to determine compliance with the sta

43、ndard 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 to more accurately reect the intent. UL Effective Date The requirements in this standard are effective

44、 April 10, 2009. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. AUGUST 9, 2013 ANSI/ISA 60079-1 (12.22.01)-2009 ANSI/UL 60079-1 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

45、 FROM UL Preface (ISA) This ISA standard is based on IEC Publication 60079-1. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-1 to the fullest extent possible. This preface is included for informational purposes and is not part of ANSI/ISA-600

46、79-1. The document is a modication of the IEC document and includes U.S. deviations encompassing both additions and deletions of information. The standards referenced within this document may contain provisions which, through reference in this text, constitute requirements of this document. At the t

47、ime 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 possibility of applying the most recent editions of the standards indicated within this document. Members of IEC and ISO ma

48、intain 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 of ISA toward a goal of uniformity in the eld of instrumentation. To be of real value, this document should not be

49、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 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 ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units