1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-31 Explosive Atmospheres Part 31: Equipment Dust Ignition Protection by Enclosure “t”UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
2、FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive Atmospheres Part 31: Equipment Dust Ignition Protection by Enclosure “t” UL 60079-31 Second Edition, Dated June 12, 2015 Summary of Topics Adoption o
3、f IEC 60079-31, Explosive Atmospheres Part 31: Equipment Dust Ignition Protection by Enclosure “t” (second edition issued November 2013) as a new IEC-based UL standard, UL 60079-31 (IEC 60079-31:2013), with US National Differences. Although this is the rst-time publication of this Standard by UL and
4、 ISA, it is being published as the Second edition in order to align ULs and ISAs edition numbers with that of the IEC Standard. As a result, one or more UL edition numbers have been skipped to match that of the IEC edition number. The new revised requirements are substantially in accordance with Pro
5、posal(s) on this subject dated January 23, 2015 and April 3, 2015. 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. U
6、L provides this Standard as is without warranty 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
7、 loss of prots, lost savings, loss of data, or 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 pai
8、d for this Standard, regardless of the form of 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 e
9、rror or deviation introduced while purchaser is 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 indicate
10、d 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. JUNE 12, 2015 UL 60079-31 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIB
11、UTION WITHOUT PERMISSION FROM UL JUNE 12, 2015 UL 60079-31 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 60079-31 Second Edition Underwriters Laboratories Inc. UL
12、 60079-31 Second Edition Explosive Atmospheres Part 31: Equipment Dust Ignition Protection by Enclosure “t” June 12, 2015 ANSI/UL 60079-31-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued
13、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 UL at any time. Revisions to this standard will be made only after processing according to the standards devel
14、opment procedures of 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. 978-1-941546-54-3 Copyright 2015 ISA These materials are subject to copyright claims of IEC, ANSI and ISA. All rights reserved. Not for resa
15、le. 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 designation of ANSI/ISA
16、60079-31 as an American National Standard (ANSI) occurred on June 12, 2015. Copyright 2015 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 all copyrights, ownersh
17、ips, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Second Edition. The most recent designation of ANSI/UL 60079-31 as an American National Standard (ANSI) occurred on June 12, 2015. ANSI approval for a standa
18、rd 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. Any other portions of this ANSI/UL standard that were not processed in accordance with AN
19、SI/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. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/.
20、 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 4 National Differences 6 FOREWORD 7 1 Scope .10 2 Normative references .10 3 Terms
21、 and denitions 11 4 General .11 4.1 Levels of protection 11 4.2 Equipment groups and ingress protection 12 4.3 Requirements for electrical equipment with level of protection “ta” .12 4.4 Requirements for electrical equipment with Level of Protection “tb” and “tc” 14 5 Construction .15 5.1 Joints 15
22、5.2 Cable glands .17 5.3 Entries .17 6 Verication and tests .18 6.1 Type tests 18 6.2 Routine tests .20 7 Marking .20 Bibliography JUNE 12, 2015 ANSI/ISA 60079-31 UL 60079-31 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL General Notes Thi
23、s UL Standard is based on IEC Publication 60079-31: second edition Explosive Atmospheres Part 31: Equipment Dust Ignition Protection by Enclosure “t”. IEC publication 60079-31 is copyrighted by the IEC. Efforts have been made to synchronize the UL edition number with that of the corresponding IEC st
24、andard with which this standard is harmonized. As a result, one or more UL edition numbers have been skipped to match that of the IEC edition number. 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
25、the users of the Standard to judge its suitability for their particular purpose. UL Effective Date The effective date for UL 60079-31 (IEC 60079-31:2013), Second edition is June 12, 2015. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved st
26、andard. The following people served as members of the STP 60079 and participated in the review of this document: NAME COMPANY T. Schnaare, Chair Rosemount Inc T. Adam Ametek Drexelbrook R. Allen Honeywell Inc D. Ankele UL LLC R. Baran Koehler Bright Star LLC S. Bihler Atec Training any IEC National
27、Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in
28、 accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from a
29、ll interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held
30、responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any dive
31、rgence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certication bodies provide conformity assessment services and, in some areas, access to IEC ma
32、rks of conformity. IEC is not responsible for any services carried out by independent certication bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts
33、 and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publ
34、ication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publ
35、ication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-31 has been prepared by IEC technical committee 31: Equipment for explosive atmospheres. This second edition cancels and replaces the rst edition published in 2008. This edition constitutes a technical revision. JUNE 12, 2015 ANSI/ISA 60079-31 UL 60079-31 7
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