1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 797 Electrical Metallic Tubing Steel STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT
2、AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Electrical Metallic Tubing Steel, UL 797 Ninth Edition, Dated November 30, 2007 Summary of Topics This revision of ANSI/UL 797 is being issued to correct an error on the title page associated wi
3、th the ANSI/UL designation. No changes in requirements are involved. As noted in the Commitment for Amendments statement located on the back side of the title page, UL, CSA, and ANCE are committed to updating this harmonized standard jointly. However, the revision pages dated March 10, 2017 will not
4、 be jointly issued by UL, CSA, and ANCE as these revision pages only address UL ANSI approval dates. 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 revised requirements are substantially in accordance with Pr
5、oposal(s) on this subject dated January 6, 2017. 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 St
6、andard 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 loss of prots, lo
7、st 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 paid for this Standar
8、d, 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 error or deviation
9、introduced while purchaser is storing an electronic Standard on the purchasers computer system. MARCH 10, 2017 UL 797 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 10, 2017 UL 797 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NO
10、T AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-536-ANCE Third Edition CSA Group CSA C22.2 No. 83.1-07 Second Edition Underwriters Laboratories Inc. UL 797 Ninth Edition Electrical Metallic Tubing Steel November 30
11、, 2007 (Title Page Reprinted: March 10, 2017) ANSI/UL 797-2012 (R2017)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Association of Standardization and Certication (ANCE), the
12、 Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA Group, or UL at any time. Revisions to this standard will be made only after processing according to the
13、standards development procedures of ANCE, CSA Group, and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorporate the same revisions into a new edition of the standard bearing the same date
14、of issue as the CSA Group and UL pages. Copyright 2012 ANCE Rights reserved in favor of ANCE. ISBN 978-1-55436-521-0 2007 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. This Standard is subject to rev
15、iew ve years from the date of publication, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquirescsagroup.org and include Proposal for change in the subject line: Standard designation (numb
16、er); relevant clause, table, and/or gure number; wording of the proposed change; and rationale for the change. To purchase CSA Group Standards and related publications, visit CSA Groups Online Store at www.shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2017 Underwriters Labo
17、ratories 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, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL S
18、tandard for Safety consists of the Ninth Edition including revisions through March 10, 2017. The most recent designation of ANSI/UL 797 as an American National Standard (ANSI) occurred on March 3, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (fron
19、t and back), or the Preface. The National Difference Page and IEC Foreword are also excluded from the ANSI approval of IEC-based standards. The Department of Defense (DoD) has adopted UL 797 on January 25, 1982. The publication of revised pages or a new edition of this Standard will not invalidate t
20、he DoD adoption. 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 https:/. To purchase UL Standards, visit Comm 2000 at http:/m-
21、 or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface . 4 1 Scope .6 2 Normative references .6 3 Denitions .6 4 Units of measurement .7 5 Construction .7 5.1 Tube 7 5.2 Finished tubing .8 5.3 Prot
22、ective coatings .8 5.4 Elbows .10 5.5 Expanded-end integral couplings 11 6 Test requirements .11 6.1 Tube .11 6.2 Protective coatings 12 7 Markings .19 Annex A (normative) A.1 Normative references .25 Annex B (informative) B.1 Dimensions of EMT Steel .28 Annex C (informative) C.1 Coating tests overv
23、iew .29 Annex D (informative) D.1 Examination of nished product by manufacturer 30 Annex E (informative) E.1 Alternative National Markings 31 Annex F (informative) F.1 Master Bundle Quantity .32 DECEMBER 21, 2012 NMX-J-536-ANCE CSA C22.2 NO. 83.1-07 UL 797 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
24、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common ANCE, CSA Group, and UL standard for electrical metallic tubing steel. It is the third edition of NMX-J-536-ANCE, the second edition of CSA C22.2 No. 83.1, and the ninth edition of UL 797. This edition of CSA
25、 C22.2 No. 83.1 supersedes the previous edition published in 2004. This edition of UL 797 supersedes the previous edition published June 30, 2004. This common standard was prepared by the Association of Standardization and Certication (ANCE), CSA Group, and Underwriters Laboratories Inc. (UL), and t
26、he conduit manufacturing industry. The efforts and support of the Technical Harmonization Subcommittee for Conduit and Tubing, of the Council of the Harmonization of Electrotechnical Standards for the Nations of the Americas (CANENA) are gratefully acknowledged. This standard is considered suitable
27、for use for conformity assessment within the stated scope of the standard. This standard was reviewed by the CSA Subcommittee on Metal Conduit and Tubing, under the jurisdiction of the CSA Technical Committee on Wiring Products and the CSA Strategic Steering Committee on Requirements for Electrical
28、Safety, and has been formally approved by the Technical Committee. This standard has been approved by the American National Standards Institute as an American National Standard. Where reference is made to a specic number of samples to be tested, the specied number is to be considered a minimum quant
29、ity. 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 judge its suitability for their particular purpose. Level of harmonization This standard uses an IEC format, but is
30、 not based on, nor is it to be considered equivalent to an IEC standard. This standard is published as an equivalent standard for ANCE, CSA Group, and UL. An equivalent standard is a standard that is substantially the same in technical content, except as follows: Technical deviations are allowed for
31、 codes and governmental regulations and those recognized as being in accordance with NAFTA Article 905, for example, because of fundamental, climatic, geographical, technological or infrastructural factors, scientic justication, or the level of protection that the country considers appropriate. Pres
32、entation is to be word for word except for editorial changes. Reasons for differences from IEC The Technical Harmonization Subcommittee identied several IEC standards that address electrical conduit and tubing included in the scope of this standard. The IEC standards for electrical conduit and tubin
33、g are recognized as being generally system-specic, containing the requirements for the relevant conduits, tubing, and associated ttings in several discrete IEC standards. The THSC determined the safe use of electrical conduit and tubing is dependent on the design and performance of the conduit and t
34、ubing systems with which they are intended to be installed. Signicant investigation is required to assess safety and system compatibility issues that may lead to harmonization of traditional North American electrical conduit and tubing and associated ttings with those presently DECEMBER 21, 2012 NMX
35、-J-536-ANCE CSA C22.2 NO. 83.1-07 UL 797 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL addressed in the known IEC standards. The THSC agreed such future investigation might be facilitated by completion of harmonization of the North Americ
36、an standards for electrical conduit and tubing and their ttings. Interpretations The interpretation by the standards development organization of an identical or equivalent standard is to be based on the literal text to determine compliance with the standard in accordance with the procedural rules of
37、 the standards development organization. If more than one interpretation of the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. ANCE effective date The effective date for ANCE wil
38、l be announced through the Diario Ocial de la Federacin (Official Gazette) and is indicated on the cover page. CSA Group effective date The effective date for CSA Group will be announced through CSA Informs or a CSA Group Certication Notice. UL effective date As of December 21, 2012, all products Li
39、sted or Recognized by UL must comply with the requirements in this standard except for Clauses 7.8, 7.9, and Annex F (Clause F.1 and Table F1) which are effective June 21, 2014. A UL effective date is established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. DECEMB
40、ER 21, 2012 NMX-J-536-ANCE CSA C22.2 NO. 83.1-07 UL 797 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Electrical Metallic Tubing Steel 1 Scope 1.1 These requirements cover electrical metallic tubing steel (EMT) and elbows for use as a met
41、al raceway for installation of wires and cables in accordance with CSA C22.1, Canadian Electrical Code, Part 1, NOM-001-SEDE, Standard for Electrical Installations, and NFPA 70, National Electrical Code (see Reference Item No. 1, Annex A). EMT is provided with a zinc, zinc-based, nonmetallic, or oth
42、er alternate corrosion-resistant exterior coating and an organic or zinc interior coating. It is the users responsibility to determine the appropriate product for their application. 1.2 Aluminum electrical metallic tubing is covered by the standards listed in Reference Item No. 2, Annex A. 2 Normati
43、ve references 2.1 Products covered by this standard shall comply with the reference installation codes and standards as appropriate for the country where the product is to be used. When the product is intended for use in more than one country, the product shall comply with the installation codes and
44、 standards for all countries where it is intended to be used. A Reference Item No. is provided at the point of use for each reference in this standard. See Annex A for a list of reference publications and the correlating list of reference item numbers to applicable country publications. 2.2 For unda
45、ted references to standards, such reference shall be considered to refer to the latest edition and all revisions to that edition up to the time when this standard was approved. For dated references to standards, such reference shall be considered to refer to the dated edition and all revisions publi
46、shed to that edition up to the time the standard was approved. 3 Denitions 3.1 The following denitions apply in this standard. 3.2 Coating(s), alternate corrosion-resistant. A primary coating(s) other than one consisting solely of zinc, which upon evaluation has demonstrated the ability to provide t
47、he level of corrosion resistance required on the exterior of tubing. See Clause 6.2.4. Note: Coating(s) may include zinc. 3.3 Coating(s), organic. An interior coating(s), other than one consisting solely of zinc, which, upon evaluation, has demonstrated the ability to provide the level of corrosion
48、resistance necessary where the coating is not subject to physical damage. See Clause 6.2.3. Note: Coating(s) may include zinc. 3.4 Coating(s), zinc. A primary coating consisting solely of zinc, which, upon evaluation, has demonstrated the ability to provide the level of corrosion resistance required
49、 on the exterior of the tubing. See Clause 6.2.2. 3.5 Elbow. A manufactured curved section of EMT. NOVEMBER 30, 2007 NMX-J-536-ANCE-2007 CSA C22.2 NO. 83.1-07 UL 797 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.6 Electrical metallic tubing steel (EMT). An unthreaded steel raceway of circular cross-section designed for the physical protection and routing of wire conductors and for u
