1、 AMERICAN NATIONAL STANDARD ANSI/ISA-60079-15 (12.12.02)-2012 Supercedes ANSI/ISA-60079-15 (12.12.02)-2009 Explosive atmospheres Part 15: Equipment protection by type of protection “n“ (Edition 4) Approved 15 February 2013 Commitment for Amendments This standard is issued jointly by ISA and Underwri
2、ters 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 standard will be made only after processing according to the standards development procedures of ISA and UL. ISA and UL will issue revisio
3、ns to this standard by means of a new edition or revised or additional pages bearing their date of issue. ISBN: 978-1-937560-65-2 Copyright 2012 By 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.
4、 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. Copyright 2013 Underwriters Laboratories Incorporated Revisions of this standard wil
5、l be made by issuing revised or additional pages bearing their date of issue. A UL standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements. The most recent designation
6、 of ANSI/ISA-60079-15 and ANSI/UL 60079-15 as an American National Standard occurred on 15 February 2013. This ANSI/UL Standard for Safety, which consists of the fourth edition, is under continuous maintenance, whereby each revision is ANSI approved upon publication. Comments or proposals for revisi
7、ons 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:/. ISA Underwriters Laboratories Inc. ANSI/ISA-60079-15 ANSI/UL 60079-15 Fourth Edition Fourth Edition Exp
8、losive atmospheres Part 15: Equipment protection by type of protection “n“ (Edition 4) This page intentionally left blank.15 February 2013 ANSI/ISA-60079-15 ANSI/UL 60079-15 5 General Notes This is the common ISA and UL standard for Explosive atmospheres Part 15: Equipment protection by type of prot
9、ection “n“. It is the fourth edition of ANSI/ISA-60079-15 (superceding ANSI/ISA-60079-15 (12.12.02)-2009 and the fourth edition of ANSI/UL 60079-15. ANSI/ISA-60079-15 and ANSI/UL 60079-15 contain identical requirements, and identical publication dates. The presentation and format of the standards ma
10、terial may differ between the two published standards. This common standard was prepared by the International Society of Automation (ISA) and Underwriters Laboratories Inc. (UL). Although the intended primary application of this standard is stated in its scope, it is important to note that it remain
11、s 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 deviations. The requirements are presented in different formats. The ISA version of the standard illus trates the national difference
12、s 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 shall be word for word except for editorial changes.
13、 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 the literal text has been identified, a revision s
14、hall be proposed as soon as possible to each of the SDOs to more accurately reflect the intent . UL Effective Date The effective dates for these new, revised or deleted requirements are being determined. This page intentionally left blank. 15 February 2013 ANSI/ISA-60079-15 ANSI/UL 60079-15 7 Prefac
15、e (ISA) This ISA standard is based on the 4th edition of IEC Publication 60079-15. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-15 to the fullest extent possible. This preface is included for informational purposes and is not part of ANSI/I
16、SA-60079-15. The document is a modification of the IEC document and includes U.S. deviations encompassing both additions and deletions of information. The significant changes with respect to the previous edition are listed below: addition of equipment protection levels; removal of the requirements f
17、or energy-limited “nL” and associated energy limited apparatus “nL”; removal of the requirements for encapsulated devices “nC”; requirements for electrical connections expanded and clarified requirements for luminaire ballasts expanded and clarified; requirements for evaluation and testing of motor
18、rotors clarified; 15 kV limit for equipment protection by type of protection “n“ added; spacing requirement for voltages above 10 kV modified; requirements for restricted breathing enclosures modified; modification to requirements for motor rotors and stators; addition of Annex A (informative); unda
19、ted references to IEC 60079-0 included. The standards referenced within this document may contain provisions which, through reference in this text, constitute requirements of this document. At the time of publicat ion, the editions indicated were valid. All standards are subject to revision, and par
20、ties 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 International Standards. ANSI maintains registers of currently va
21、lid U.S. National Standards. This document has been prepared as part of the service of the International Society of Automation (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 periodic review. Toward t
22、his 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 Stand
23、ards 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 USA users of ISA standards
24、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 practices, and technical repo
25、rts to the greatest extent possible. IEEE/ASTM SI 10, American National Standard for Metric Practice, and future revisions, will be the reference guide for definitions, symbols, abbreviations, and conversion factors. 15 February 2013 ANSI/ISA-60079-15 ANSI/UL 60079-15 8 It is the policy of ISA to en
26、courage and welcome the participation of all concerned individuals and interests in the development of ISA standards, recommended practices, and technical reports. Participation in the ISA standards-making process by an individual in no way constitutes endorsement by the employer of that individual,
27、 of ISA, or of any of the standards, recommended practices, and technical reports that ISA develops. CAUTION ISA DOES NOT TAKE ANY POSITION WITH RESPECT TO THE EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS ASSERTED IN CONNECTION WITH THIS DOCUMENT, AND ISA DISCLAIMS LIABILITY FOR THE INFRINGEMENT OF AN
28、Y PATENT RESULTING FROM THE USE OF THIS DOCUMENT. USERS ARE ADVISED THAT DETERMINATION OF THE VALIDITY OF ANY PATENT RIGHTS, AND THE RISK OF INFRINGEMENT OF SUCH RIGHTS, IS ENTIRELY THEIR OWN RESPONSIBILITY. PURSUANT TO ISAS PATENT POLICY, ONE OR MORE PATENT HOLDERS OR PATENT APPLICANTS MAY HAVE DIS
29、CLOSED PATENTS THAT COULD BE INFRINGED BY USE OF THIS DOCUMENT AND EXECUTED A LETTER OF ASSURANCE COMMITTING TO THE GRANTING OF A LICENSE ON A WORLDWIDE, NON-DISCRIMINATORY BASIS, WITH A FAIR AND REASONABLE ROYALTY RATE AND FAIR AND REASONABLE TERMS AND CONDITIONS. FOR MORE INFORMATION ON SUCH DISCL
30、OSURES AND LETTERS OF ASSURANCE, CONTACT ISA OR VISIT WWW.ISA.ORG/STANDARDSPATENTS. OTHER PATENTS OR PATENT CLAIMS MAY EXIST FOR WHICH A DISCLOSURE OR LETTER OF ASSURANCE HAS NOT BEEN RECEIVED. ISA IS NOT RESPONSIBLE FOR IDENTIFYING PATENTS OR PATENT APPLICATIONS FOR WHICH A LICENSE MAY BE REQUIRED,
31、 FOR CONDUCTING INQUIRIES INTO THE LEGAL VALIDITY OR SCOPE OF PATENTS, OR DETERMINING WHETHER ANY LICENSING TERMS OR CONDITIONS PROVIDED IN CONNECTION WITH SUBMISSION OF A LETTER OF ASSURANCE, IF ANY, OR IN ANY LICENSING AGREEMENTS ARE REASONABLE OR NON-DISCRIMINATORY. ISA REQUESTS THAT ANYONE REVIE
32、WING THIS DOCUMENT WHO IS AWARE OF ANY PATENTS THAT MAY IMPACT IMPLEMENTATION OF THE DOCUMENT NOTIFY THE ISA STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER. ADDITIONALLY, THE USE OF THIS DOCUMENT MAY INVOLVE HAZARDOUS MATERIALS, OPERATIONS OR EQUIPMENT. THE DOCUMENT CANNOT ANTICIPATE
33、 ALL POSSIBLE APPLICATIONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED WITH USE IN HAZARDOUS CONDITIONS. THE USER OF THIS DOCUMENT MUST EXERCISE SOUND PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USERS PARTICULAR CIRCUMSTANCES. THE USER MUST ALSO CONSIDER THE APPLICABILI
34、TY OF ANY GOVERNMENTAL REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH PRACTICES BEFORE IMPLEMENTING THIS DOCUMENT. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. THE COMMITTEE HAS NOT YET ADDRESSED THE POTENTIAL ISSUES IN THIS VE
35、RSION. The following people served as members of ISA Subcommittee ISA12.12: NAME COMPANY R. Masek, Chair CSA Group M. Coppler, Managing Director Det Norske Veritas Certification Inc. N. Abbatiello Speer Equipment Inc. 15 February 2013 ANSI/ISA-60079-15 ANSI/UL 60079-15 9 S. Arnold Ametek Drexelbrook
36、 W. Bennett Mine Safety Appliances Co. S. Blais EGS Electrical Group K. Boegli Phoenix Contact S. Czaniecki Endress + Hauser Canada A. Engler Det Norske Veritas DNV D. Genender Pepperl + Fuchs Inc. P. Kelly UL LLC S. Kiddle ABB Inc. G. Kozinski GE Infrastructure Sensing J. Kuczka Killark C. Kurtzman
37、 Rosemount Inc. B. Larson Turck Inc. W. Lawrence FM Approvals LLC E. Leubner Cooper Crouse-Hinds N. Ludlam FM Approvals Ltd. E. Massey Baldor Electric Company J. McCormick Siemens Process Analytics J. Miller Detector Electronics Corporation R. Parks Intertek D. Wechsler Wechsler Consulting R. Wigg E
38、-x Solutions International Pty. Ltd. The following people served as members of ISA Committee ISA12: NAME COMPANY T. Schnaare, Chair Rosemount Inc. W. Lawrence, Vice Chair FM Approvals LLC M. Coppler, Managing Director Det Norske Veritas Certification Inc. R. Allen Honeywell Inc. D. Ankele UL LLC S.
39、Bihler Zone Safe Solutions, Inc. K. Boegli Phoenix Contact D. Burns Shell P b) develop a maximum surface temperature in excess of the maximum value appropriate to the temperature class of the equipment, unless the temperature of the surface or hot spot is prevented from causing ignition of a surroun
40、ding explosive atmosphere by one of the methods described in Clauses 16 to 20 as appropriate, or is otherwise shown to be safe as specified in 5.1. Manually operated arcing or sparking components located within an enclosure that have been considered to be not accessible in normal operation without t
41、he use of a tool (see fastener general requirements of ANSI/ISA-IEC 60079-0), may be evaluated as non-sparking (nA) components. These components shall be identified in the documentation prepared in accordance with the documentation requirements of ANSI/ISA-IEC 60079-0. 5 Temperatures 5.1 Maximum sur
42、face temperature The maximum surface temperature shall be determined in accordance with the determination of maximum temperature requirements of ANSI/ISA-IEC 60079-0. The surface to be considered shall be: for nR equipment and nC equipment: the external surface of the equipment; for type nA equipmen
43、t: the surface of any part of the electrical equipment, including the surface of internal parts to which the explosive gas atmosphere might have access NOTE This may be the outside surface of “nC” components located within “nA” equipment. 15 February 2013 ANSI/ISA-60079-15 ANSI/UL 60079-15 27 5.2 Sm
44、all components For evaluation of small components, the small component temperature requirements of ANSI/ISA-IEC 60079-0 applies. Temperature relaxations for thin wires and printed circuit tracks contained in ANSI/ISA-IEC 60079-11 may also be used in application of this standard. 6 Requirements for e
45、lectrical equipment 6.1 General Electrical equipment with type of protection “n“ shall comply with the requirements of this standard and the applicable parts of ANSI/ISA-IEC 60079-0 for the method(s) of protection used. 6.2 Opening times Except for nR restricted breathing enclosures, the opening tim
46、e requirements of ANSI/ISA-IEC 60079-0 do not apply. 6.3 Minimum degree of protection 6.3.1 General Unless specified elsewhere in this standard, the enclosure of the equipment, when tested in accordance with ANSI/ISA-IEC 60079-0 shall provide at least the degree of protection described in a) or b) u
47、nless safety would not be impaired by contact with solid foreign bodies or water (for example, strain gauges, resistance thermometers, or thermocouples). In this case, the documentation (see Clause 25) shall explain why and shall prescribe any special installation requirements which may be necessary
48、 and the equipment shall be marked with the symbol “X“ to indicate this specific special condition of use (see the marking requirements of ANSI/ISA-IEC 60079-0): a) IP54 where there are bare live parts or IP44 where there are insulated live parts; b) IP4X where there are bare live parts, or IP2X whe
49、re there are insulated live parts and the equipment is intended for installation only in locations providing adequate protection against the entry of solid foreign objects or water capable of impairing safety, and the equipment is marked with the symbol “X“ to indicate this specific condition of use (see the marking requirements of ANSI/ISA-IEC 60079-0). For protected equipment, the degree of protection shall be marked according to Clause 24. NOTE 1 For requirements for rotating electrical machines, see Clause 8. NOT
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