1、 UL 60079-2 STANDARD FOR SAFETY Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosure “p” UL Standard for Safety for Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosure “p”, UL 60079-2 Fifth Edition, Dated August 27, 2010 Summary of Topics Adoption o
2、f ANSI/ISA 60079-2, Standard for Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosures “p” as ANSI/UL 60079-2. This Standard is being issued to update the title page to reflect the reaffirmation of its ANSI approval. No changes in requirements have been made. Although this i
3、s the first-time publication of this Standard by UL, it is being published as the Fifth edition in order to align ULs edition number with that of the ISA and IEC Standards. Please note that as this is a simple reaffirmation of an existing ISA standard, National Differences are shown in ISAs format.
4、All future revisions for this standard will be published using ULs National Differences. These requirements are substantially in accordance with Proposal(s) on this subject dated September 12, 2014. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
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9、ect, except for those paragraphs, sections, tables, figures, and/or other elements of the Standard having future effective dates 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
10、by a “SUPERSEDED REQUIREMENTS“ notice. ISA - International Society of Automation ANSI/ISA 60079-2-2010 (R2015) Fifth Edition Underwriters Laboratories Inc. ANSI/UL 60079-2 Fifth Edition Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosure “p” August 27, 2010 (Title Page Repr
11、inted: January 16, 2015) ANSI/ISA/UL 60079-2-2010 (R2015) Commitment for Amendments This standard is issued jointly by 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. ISBN 978-1-941546-31-4 Copyr
12、ight 2015 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
13、 of ISA. All requests pertaining to this standard should be submitted to ISA. 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, owner
14、ships, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through January 16, 2015. The most recent designation of ANSI/ISA/UL 60079-2 as a Reaffirmed American National Standard (
15、ANS) occurred on January 16, 2015. 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 the ANSI approval of IEC-based standards. Comments or proposals for revi
16、sions 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:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard s
17、hould 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. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503. 1 ANSI/ISA-60079-2 (12.04.01)-2010 (R2015
18、) ANSI/UL 60079-2 August 27, 2010 General Notes This UL Standard is based on IEC Publication IEC 60079-2: 5th edition Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosure “p”, and is copyrighted by the IEC. Efforts have been made to synchronize the UL edition number with tha
19、t of the corresponding IEC standard 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. This is the common ISA and UL standard for Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosure
20、“p”. It is the Fifth edition of ANSI/ISA-60079-2 (superseding ANSI/ISA-12.24.01)-2004 and the Fifth edition of ANSI/UL 60079-2. The document is a modification of the IEC document and includes U.S. national differences encompassing both additions and deletions of information. As the publication of th
21、is standard by UL is being done as a result of a simple reaffirmation of ISAs currently published standard, National Differences are shown using ISAs format. All future publications of this standard will show National Differences using ULs format. This common standard was prepared by the (ISA) - The
22、 International Society of Automation on August 27, 2010 but is now being maintained by 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
23、 to judge its suitability for their particular purpose. Level of harmonization This standard adopts the IEC text with national differences. The requirements in this Standard are not presented in different formats by UL and ISA as this is a simple reaffirmation of an existing ISA standard. Therefore,
24、 the UL version of the standard is being published as the ISA version of the standard which illustrates the national differences from the IEC text through the use of legislative text (strike-out and underline). Interpretations The interpretation by the SDO of an identical or equivalent standard shal
25、l 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 identified, a revision shall be proposed as soon as possible to each of the SDOs to more accurately reflect the in
26、tent. UL Effective Date The requirements in this standard are in effect. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. August 27, 2010 ANSI/ISA-60079-2 (12.04.01)-2010 (R2015) ANSI/UL 60079-2 2 Preface (ISA) This ISA standard
27、is based on IEC Publication 60079-2. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-2 to the fullest extent possible. This preface is included for informational purposes and is not part of ANSI/ISA-60079-2. The document is a modification of t
28、he 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 time of publication, the editions indica
29、ted 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 maintain registers of currently valid Int
30、ernational 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 field of instrumentation. To be of real value, this document should not be static but should be subject to perio
31、dic review. The ISA 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 benefits to US
32、A users of ISA standards 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 prac
33、tices, 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 any IEC National Committee interested in the subject dealt with may participate in this preparatory work.
34、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 accordance with conditions determined by agreement between the two organizations. 2) The
35、 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 all interested IEC National Committees. 3) IEC Publications have the form of recommendatio
36、ns 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 responsible for the way in which they are used or for any misinterpretation by any end us
37、er. 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 divergence between any IEC Publication and the corresponding national or regional publication
38、 shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No
39、liability shall attach to IEC or its directors, employees, servants or agents including individual experts 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 (
40、including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication 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 applicatio
41、n of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. 7 ANSI/ISA-60079-2 (12.04.01)-2010 (R2015) ANSI/UL 60079-2 August 27
42、, 2010 International Standard IEC 60079-2 has been prepared by technical committee 31: Explosive atmospheres. This fifth edition cancels and replaces the fourth edition published in 2001 and constitutes a technical revision. The significant changes with respect to the previous edition are listed bel
43、ow: Introduction of the “Equipment protection level concept” - See Annex H. - 3.13 Eliminate reference to “room” in the definition of pressurization. - 5.3.3 Restrict to type px. - 5.3.3 Add warning for type pz and type py for any cover removable without the use of a tool. - 7.6 Move wording “For ty
44、pe px” to beginning of subclause to clarify 7.6 only applies to type px. - 7.7 c) Clarify that the instruction label should specify purge time and pressure/flow. - 18.7 Collect marking requirements throughout the document in the “Marking” clause. The text of this standard is based on the following d
45、ocuments: FDIS Report on voting 31/668/FDIS 31/681/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This standard is to be read in conjunction with IEC 60079-0:2004, Electrical apparatus for explosive gas atmosphe
46、res - Part 0: General requirements. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 60079 series, under the general title Explosive atmospheres can be found on the IEC website. Future standards in this series will carry the new general
47、title as cited above. Titles of existing standards in this series will be updated at the time of the new edition. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the
48、 data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; August 27, 2010 ANSI/ISA-60079-2 (12.04.01)-2010 (R2015) ANSI/UL 60079-2 8 replaced by a revised edition, or amended. 9 ANSI/ISA-60079-2 (12.04.01)-2010 (R2015) ANSI/UL 60079-2 August 27, 2010 IN
49、TRODUCTION This part of IEC 60079 standard gives requirements for the design, construction, testing and marking of electrical apparatus for use in potentially explosive atmospheres in which a) a protective gas maintained at a pressure above that of the external atmosphere is used to guard against the formation of an explosive gas atmosphere within enclosures which do not contain an internal source of release of flammable gas or vapour and, where necessary; b) a protective gas is provided in suffic
