1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C80.6-2005Electrical Intermediate Metal Conduit (EIMC)ANSI C80.6-2005 Revision of ANSI C80.6-1994 American National Standard For Electrical Intermediate Metal Conduit (EIMC) Secretariat: National Electrical Manufacturers Ass
2、ociation Approved September 16, 2005 American National Standards Institute, Inc. ANSI C80.6-2005 NOTICE AND DISCLAIMER 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
3、. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. NEMA standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development pr
4、ocess. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process and establishes rules to promote fairness in the development of consensus, it does not write the document and it does
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9、r, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional vi
10、ews or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other state
11、ment of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. ANSI C80.6-2005 i AMERICAN NATIONAL STANDARD Approval of an American National Standard requires verification
12、 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 has been reached by directly and materially affected intere
13、sts. 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 American National Standards is completely voluntary; their existen
14、ce 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 Standards Institute does not develop standards and will in no circum
15、stances 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. Requests for interpretations should be addressed to the secret
16、ariat 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 be taken periodically to reaffirm, revise, or withdraw this
17、 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 17th Street, Rosslyn, VA 22209 Copyright 2005 by National Elect
18、rical 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 and Pan American Copyright Conventions. No part of this pu
19、blication 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 ANSI C80.6-2005 ii This page intentionally left blank.ANSI C80.6-2005 iii Contents Page Foreword v 1 Scope 1 2 Norma
20、tive References .1 3 Definitions 2 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 2 5.6 Protective coating for corrosion resistance.2 5.7 Surface treatment2 6 Detailed Requirements.3 6.1 Exterior
21、 coating .3 6.1.1 Zinc coating3 6.1.2 Alternative corrosion resistant coating (ACRC) .3 6.2 Interior coating 3 6.3 Threading and chamfering 3 6.4 Identification3 6.5 Dimensions .3 6.6 Threads .3 6.7 Couplings 3 6.8 Elbows .4 7 Test Procedures.4 7.1 Bending properties4 7.1.1 Ductility of steel4 7.1.2
22、 Ductility of coatings 5 7.2 Thickness of zinc coating5 7.3 Alternate corrosion resistant coatings (ACRC) .5 7.4 Quality of organic coating for use on interior surface .5 8 Examination of Product6 8.1 Place of inspection6 8.2 Visual inspection of conduit 6 ANSI C80.6-2005 iv 8.3 Retests .6 9 Marking
23、s .6 9.1 General .6 9.2 Alternate corrosion resistant coating marking.6 9. 3 Supplementary coating marking .7 Tables 1 Dimensions of threads for intermediate metal conduit.7 2 Dimensions of intermediate metal conduit.8 3 Dimensions of couplings 9 4 Minimum acceptable dimensions of elbows and other b
24、ends 10 Figures 1 Test apparatus for bending conduit .5 2 Conduit bend11 ANSI C80.6-2005 v Foreword (This Foreword is not part of American National Standard C80.6-2005.) This standard was developed by the Accredited Standards Committee on Raceways for Electrical Wiring Systems, C80. The objective of
25、 the committee is to produce a comprehensive specification that would establish uniform dimensions and standard construction requirements for Electrical Steel Metal Conduit, Electrical Metallic Tubing, Electrical Intermediate Metal Conduit and Electrical Rigid Aluminum Conduit raceway products and t
26、heir associated components. The standard was originally approved in 1986 and revised in 1994 and 2005. Suggestions for improvement of this standard will be welcomed. They should be sent to: National Electrical Manufacturers Association 1300 North 17th Street, Suite1847 Rosslyn, VA 22209. This standa
27、rd 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 not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the C80 Co
28、mmittee had the following members: J. A. Gruber, Chairman J. P.Collins, Jr., Secretary Organization Represented: Name of Representative: Aluminum Association P. Pollak American National Standards Institute H. Benko American Iron and Steel Institute J. A. Gruber American Iron and Steel Institute M. J
29、. Brett, Jr. American Iron and Steel Institute J. Robbins American Pipe Fittings Association D. Thompson International Association of Electrical Inspectors W. Lilly International Brotherhood of Electrical Workers H. Hickman National Electrical Contractors Association B. Stauffer National Electrical
30、Manufacturers Association A. W. Ballard National Electrical Manufacturers Association S. Blais National Electrical Manufacturers Association T. McNeive National Electrical Manufacturers Association E. Thompson National Electrical Manufacturers Association J. Dodds Steel Tube Institute K. Carroll Ste
31、el Tube Institute G. Scartozzi Underwriters Laboratories, Inc G. Walbrecht Unaffiliated D. Gearing Unaffiliated R. Loyd Unaffiliated H. E. Harper, Jr. ANSI C80.6-2005 vi This page intentionally left blank. 1 For Electrical Intermediate Metal Conduit (EIMC) 1 Scope This standard covers the requiremen
32、ts for steel electrical intermediate metal conduit for use as a raceway for wires or cables of an electrical system. Finished conduit is produced in nominal 10 ft (3.05 m) lengths, threaded on each end with one coupling attached. It is protected on the exterior surface with a metallic zinc coating o
33、r an alternate corrosion protection coating (See UL 1242 Third edition Clauses 1.3, 1.4, 16.2, 17, 18, 19, 22.6 and 22.7) and on the interior surface with a zinc or organic coating. This standard also covers conduit couplings, elbows, and conduit lengths other than 10 ft (3.05 m). Properly assembled
34、 systems of conduit, couplings, elbows and nipples manufactured in accordance with this standard, and other identified fittings, provide for the electrical continuity required of an equipment grounding conductor. 2 Normative References The following standards contain provisions which, through refere
35、nce in this text, constitute requirements of this American National Standard. At the time of this publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of
36、 applying the most recent editions of the standards indicated below unless otherwise specified. ANSI/ASME B1.20.1, Pipe Threads, General Purpose (Inch) ASTM A 239 95(1999), Standard Practice for Locating the thinnest Spot in a Zinc (Galvanized) Coating on Iron or Steel Articles ASTM B 499 96, Standa
37、rd Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals UL 1242, Electrical Intermediate Metal Conduit Steel 3 Definitions 3.1 electrical intermediate metal conduit (EIMC): A threadable steel raceway of circular cross-section design
38、ed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor. 3.2 threaded coupling: .An internally threaded steel cylinder for joining together the components of an EIMC system. 3.3 elbow: A manufactured curved section of EIMC threaded on each
39、end. 3.4 straight conduit: A straight length of EIMC without a coupling. 3.5 finished conduit: A straight length of EIMC with one coupling attached. AMERICAN NATIONAL STANDARD ANSI C80.6-2005ANSI C80.6-2005 2 3.6 alternate corrosion resistant coating (ACRC): A coating(s), other than one consisting s
40、olely of zinc, which, upon evaluation, has demonstrated the ability to provide the level of corrosion resistance required on the exterior of conduit. It is not prohibited that the coatings include zinc. (See UL 1242, third edition, Clauses 1.3, 1.4, 16.2, 17, 18, 19, 22.6 and 22.7.) 4 Units of Measu
41、rements The values stated in inch-pound units are to be regarded as the standard. The metric dimensions are exact conversions for safety considerations. 5 General Requirements 5.1 Circular cross section Electrical intermediate metal conduit shall have a circular cross section sufficiently accurate t
42、o permit the cutting of threads in accordance with Table 1. 5.2 Wall thickness The wall thickness shall be uniform throughout and in accordance with Table 2. 5.3 Interior surface The interior surface shall be free from injurious defects. 5.4 Welding The welding of all seams shall be continuous and d
43、one in a workmanlike manner. 5.5 Cleaning The conduit shall be adequately cleaned before the application of the protective coating. The cleaning process shall leave the exterior and interior surfaces of the conduit in such a condition that the protective coating shall be smooth and adhere firmly. 5.
44、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 alternate corrosion resistant coating (ACRC). (See UL 1242, third edition, Clauses 1.3, 1.4, 16.2, 17, 18, 19, 22.6 and 22.7). 5.6.2 The inter
45、ior surface 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 treatment Any surface treatment not exceeding 0.00015 inch (0.038 mm) that is employed a
46、s a topcoat or conversion coating is not required to meet the requirements for an ACRC or organic coating. ANSI C80.6-2005 3 6 Detailed Requirements 6.1 Exterior coating 6.1.1 Zinc coating The zinc coating thickness on the outside surface shall be equivalent to a minimum thickness of 0.0008 inch (0.
47、02 mm) as tested in accordance with 7.2. 6.1.2 Alternate corrosion resistant coating (ACRC) (See UL 1242, third edition, Clauses 1.3, 1.4, 16.2, 17, 18, 19, 22.6 and 22.7.) 6.2 Interior coating 6.2.1 The zinc coating shall be tested in accordance with 7.1.2. 6.2.2 The organic coating shall not softe
48、n at a temperature of 120oF (49oC) and shall be sufficiently elastic to meet the test described in 7.4. 6.3 Threading and chamfering Each length of conduit and elbow shall be threaded on both ends, and each end shall be chamfered or otherwise treated to remove burrs and sharp edges. Threads shall co
49、mply with the requirements of 6.6. If threads are cut after the zinc coating has been applied, the threads shall be treated with a protective coating to prevent corrosion before installation. This treatment shall not impair electrical continuity through couplings or fittings after installation. 6.4 Identification Each length of conduit and elbow shall be identified in accordance with 9. 6.5 Dimensions The dimensions of EIMC shall be in accordance with Table 2. 6.6 Threads The number of threads per inch (threads per 25.4 mm), and the length of the threaded portion at each end of each
