1、 ANSI C80.3-2005 American National Standard for Steel Electrical Metallic Tubing (EMT) Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright National Electrical Manuf
2、acturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 Revision of ANSI C80.3-1994 American National Standard For Steel Electrical Metallic Tubing (EMT) Secretariat: National Electrical Manufactur
3、ers Association Approved August 18, 2005 American National Standards Institute, Inc. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 NOTICE AND DISCLAIMER
4、 The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the develo
5、pment of this document. NEMA standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic
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13、 is solely the responsibility of the certifier or maker of the statement. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 i AMERICAN NATIONAL STANDARD App
14、roval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement
15、 has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of Americ
16、an National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standard
17、s Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Re
18、quests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. Caution Notice: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action
19、 be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 1300 North 17t
20、h Street, Rosslyn, VA 22209 Copyright 2005 by National Electrical Manufacturers Association All rights reserved including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International
21、 and Pan American Copyright Conventions. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Printed in the United States of America Copyright National Electrical Manufacturers Association P
22、rovided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 ii This page intentionally left blank.Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction
23、or networking permitted without license from IHS-,-,-ANSI C80.3-2005 iiiContents Page Foreword v 1 Scope 1 2 Normative References .1 3 Definitions 1 4 Units of Measurements 2 5 General Requirements.2 5.1 Circular cross section2 5.2 Wall thickness .2 5.3 Interior surface 2 5.4 Welding .2 5.5 Cleaning
24、2 5.6 Protective coating for corrosion resistance.2 5.7 Surface treatments2 6 Detailed Requirements 2 6.1 Exterior coating .2 6.1.1 Zinc coating2 6.1.2 Alternative corrosion resistant coating (ACRC).3 6.2 Interior coating 3 6.3 Chamfering3 6.4 Identification3 6.5 Dimensions .3 6.6 Elbows .3 7 Test P
25、rocedures.3 7.1 Bending properties3 7.1.1 Ductility of steel3 7.1.2 Ductility of coatings at ambient temperature3 7.2 Thickness of zinc coating4 7.3 Alternate corrosion resistant coatings (ACRC).4 7.4 Performance requirement of organic coating for use on interior surface .4 Copyright National Electr
26、ical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 iv 8 Examination of Product4 8.1 Place of inspection4 8.2 Visual inspection of tubing 4 8.3 Visual inspection of elbows.5 8.4 Retes
27、ts .5 9 Markings .5 9.1 General .5 9.2 Nonmetallic alternate corrosion resistant coating temperature marking 5 9.3 Supplementary coating marking .5 Tables 1 Dimensions and weights for steel electrical metallic tubing.6 2 Minimum dimensions for 90-degree elbows 7 Copyright National Electrical Manufac
28、turers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 vForeword (This Foreword is not part of American National Standard C80.3-2005.) This standard was developed by the Accredited Standards Committ
29、ee on Raceways for Electrical Wiring Systems, C80. The objective of the committee is to produce a comprehensive specification that would establish uniform dimensions and standard construction requirements for Electrical Rigid Steel Conduit, Steel Electrical Metallic Tubing, Electrical Intermediate M
30、etal Conduit and Electrical Aluminum Rigid Conduit raceway products and their associated components. The standard was originally approved in 1950 and revised in 1953, 1959, 1963, 1966, 1977, 1983, 1991, 1994 and 2005. Suggestions for improvement of this standard will be welcomed. They should be sent
31、 to: National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847 Rosslyn, Virginia 22209. This standard was processed and approved for submittal to ANSI by the Accredited Standards Committee on Raceways for Electrical Wiring Systems, C80. Committee approval of the standard does
32、not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the C80 Committee had the following members: J. A. Gruber, Chairperson J. P. Collins, Jr., Secretary Organization Represented: Name of Representative: Aluminum Association P. Pollak Americ
33、an National Standards Institute H. Benko American Iron and Steel Institute J. A. Gruber American Iron and Steel Institute M. J. Brett, Jr. American Iron and Steel Institute J. Robbins American Pipe Fittings Association D. Thompson International Association of Electrical Inspectors W. Lilly Internati
34、onal Brotherhood of Electrical Workers H. Hickman National Electrical Contractors Association B. Stauffer National Electrical Manufacturers Association A. W. Ballard National Electrical Manufacturers Association S. Blais National Electrical Manufacturers Association T. McNeive National Electrical Ma
35、nufacturers Association E. Thompson National Electrical Manufacturers Association J. Dodds Steel Tube Institute K. Carroll Steel Tube Institute G. Scartozzi Underwriters Laboratories, Inc G. Walbrecht Unaffiliated D. Gearing Unaffiliated R. Loyd Unaffiliated H. E. Harper, Jr. Copyright National Elec
36、trical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 vi This page intentionally left blank. Copyright National Electrical Manufacturers Association Provided by IHS under license with
37、 NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 For Steel Electrical Metallic Tubing (EMT) 1 Scope This standard covers the requirements for steel electrical metallic tubing, for use as a raceway for wires or cables of an electrical system. Finished tubing i
38、s typically furnished in nominal 10 ft (3.05 m) lengths. It is protected on the exterior surface with a metallic zinc coating or alternate corrosion protection coating (see UL 797 Eighth edition Clauses 5.3.3, 6.2.4, 7.5 and 7.6) and on the interior surface with a zinc or organic coating. This stand
39、ard also covers electrical metallic tubing elbows. Properly assembled systems of steel electrical metallic tubing and elbows, manufactured in accordance with this standard, and other identified fittings provide for the electrical continuity required of an equipment grounding conductor. 2 Normative R
40、eferences The following standards contain provisions which, through reference in this text, constitute requirements of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Americ
41、an National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below unless otherwise specified. ASTM A 239 95 (1999), Standard Practice for Locating the Thinnest Spot in a Zinc (Galvanized) Coating on Iron or Steel Articles ASTM B
42、499 96 (2002), Standard Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals UL 797, Electrical Metallic Tubing - Steel 3 Definitions 3.1 Electrical metallic tubing (EMT): A steel raceway of circular cross-section designed for the p
43、hysical protection and routing of conductors and cables for use as an equipment grounding conductor. 3.2 Elbow: A manufactured curved section of EMT. 3.3 Alternate corrosion resistant coating (ACRC): A coating(s), other than one consisting solely of zinc, which, upon evaluation, has demonstrated the
44、 ability to provide the level of corrosion resistance required on the exterior of tubing. It is not prohibited that the coatings include zinc. (See UL 797 Eighth edition Clauses 5.3.3, 6.2.4, 7.5 and 7.6.) AMERICAN NATIONAL STANDARD ANSI C80.3-2005Copyright National Electrical Manufacturers Associat
45、ion Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C80.3-2005 2 4 Units of Measurements The values stated in inch-pound units are to be regarded as the standard. The metric dimensions are exact conversions for safety con
46、siderations. 5 General Requirements 5.1 Circular cross section Electrical metallic tubing shall have a circular cross section sufficiently accurate to permit the application of identified EMT fittings. 5.2 Wall thickness The wall thickness shall be uniform throughout. 5.3 Interior surface The interi
47、or surface shall be free from injurious defects. 5.4 Welding The welding of all seams shall be continuous and done in a workmanlike manner. 5.5 Cleaning The tubing shall be adequately cleaned before the application of the protective coating. The cleaning process shall leave the exterior and interior
48、 surfaces of the tubing in such a condition that the protective coating shall be smooth and adhere firmly. 5.6 Protective coating for corrosion resistance 5.6.1 The exterior surface shall be either thoroughly and evenly coated with metallic zinc or protected with an ACRC. 5.6.2 The interior surface
49、shall be protected by a zinc or an organic coating. The interior coating shall have a smooth continuous surface. An occasional variation due to uneven flow of coating shall be acceptable. 5.7 Surface treatments Any surface treatment not exceeding 0.00015 inch (0.0038 mm) that is employed as a topcoat or conversion coating is not require
