NEMA VE 1-2009 METAL CABLE TRAY SYSTEMS《金属电缆槽系统》.pdf

1、 NEMA VE 1 METAL CABLE TRAY SYSTEMS NEMA Standards Publication VE 1-2009 Canadian Standards Association Publication CSA C22.2 No. 126.1-09 Metal Cable Tray Systems Published by: National Electrical Manufacturers Association 1300 North 17th Street Rosslyn, Virginia 22209 www.nema.org In Canada, publi

2、shed by: Canadian Standards Association 5060 Spectrum Way, Suite 100 Mississauga, ON, Canada L4W 5N6 www.csa.ca Copyright 2009 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Con

3、vention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. Copyright 2009 ISBN 1-55324-497-4 Canadian Standards Association All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permis

4、sion of the publisher. Commitment for Amendments This Standard is issued jointly by Canadian Standards Association (CSA) and the National Electrical Manufacturers Association (NEMA). Amendments to this Standard will be made only after processing according to the standards-writing procedures of CSA a

5、nd NEMA. 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. Consensus does not necessarily mean that there is unanimous agreement among every pers

6、on participating in the development of this document. The National Electrical Manufacturers Association (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

7、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 not independently test, evaluate, o

8、r verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compen

9、satory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that t

10、he information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is no

11、t undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice

12、 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 views or information not covered by

13、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 statement of compliance with any health

14、 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. NEMA VE 1-2009/CSA C22.2 No. 126.1-09 Page i CONTENTS Preface .iii Foreword (NEMA) .iv Section 1 SCOPE 1 Section 2 DEFINITIONS AND ABBREVIATIO

15、NS.2 2.1 Definitions. 2 2.2 Abbreviations 3 Section 3 GENERAL . 4 3.1 Reference Publications 4 3.2 Units of Measurement 4 Section 4 CONSTRUCTION . 5 4.1 Materials. 5 4.2 Finishes 5 4.3 Typical Dimensions 6 4.3.1 General. 6 4.3.2 Lengths of Straight Sections. 6 4.3.3 Widths. 6 4.3.4 Fill Depths. 7 4.

16、3.5 Nominal Rung Spacings on Straight Sections 7 4.3.6 Inside Radii. 7 4.3.7 Degrees of Arc for Elbows 7 4.4 Quality of Work. 8 4.5 Fittings 8 4.6 Fasteners . 8 4.7 Bonding 8 4.8 Load Capacity 8 Section 5 TESTS. 9 5.1 Electrical Continuity of Connections. 9 5.2 Load Testing. 9 5.2.1 General. 9 5.2.2

17、 Test Specimen 9 5.2.3 Type and Length of Span . 9 5.2.4 Orientation of Specimen. 9 5.2.5 Supports . 9 5.2.6 Loading Material . 10 5.2.7 Load Application. 10 5.2.8 Loading to Destruction (Method A). 10 5.2.9 Loading to Residual Deflection (Method B) 11 5.3 Interpolation of Test DataFor Use with 5.2.

18、8 (Method A) Only. 11 5.4 Rung Load Capacity (Optional) 11 5.4.1 General. 11 5.4.2 Test Equipment 12 5.4.3 Test Specimen 12 5.4.4 Span Length and Supports. 12 5.4.5 Orientation of Specimens . 12 5.4.6 Loading. 12 NEMA VE 1-2009/CSA C22.2 No. 126.1-09 Page ii 5.4.7 Load Capacity. 12 5.4.8 Interpolati

19、on of Rung Load Test Data. 12 Section 6 PRODUCT MARKING, INFORMATION, AND INSTALLATION . 13 6.1 Marking on Product 13 6.2 Product Information 13 6.3 Cable Tray Installation 13 Tables Table 1 Span/Load Class DesignationUSA 14 Table 2 Span/Load Class DesignationCANADA 14 Figures Figure 1 Illustration

20、of Selected Definitions . 15 Figure 2 Application of LoadRung Load Capacity . 16 Annex (informative) Annex A MarkingsFrench Translations 17 NEMA VE 1-2009/CSA C22.2 No. 126.1-09 Page iii Preface This is the common CSA and NEMA Standard for Metal Cable Tray Systems. It is the third edition of C22.2 N

21、o. 126.1, superseding the previous editions published in 2002 and 1998, and the fifth edition of NEMA VE 1, superseding the previous edition published in 2002. This common Standard was prepared by the CANENA Technical Harmonization Committee for Metal Cable Tray Systems, comprising members from the

22、Canadian Standards Association, National Electrical Manufacturers Association, and the cable tray manufacturing industry. The efforts of the CANENA Technical Harmonization Committee are gratefully acknowledged. This standard is considered suitable for use for conformity assessment within the stated

23、scope of the standard. This Standard was reviewed by the CSA Subcommittee on Cable Tray Systems under the jurisdiction of the Technical Committee on Wiring Products and the Strategic Resource Group, and has been formally approved by the Technical Committee. Where reference is made to a specific numb

24、er of samples to be tested, the specified number is considered to be a minimum quantity. This Standard was also approved at NEMA by the Codes and Standards Committee. NOTEAlthough the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the re

25、sponsibility 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 not based on, nor is it to be considered equivalent to, an IEC standard. This Standard is published as an equivalent standard. An equivalen

26、t standard is a standard that is substantially the same in technical content, except as follows. Technical deviations are allowed for Codes and Governmental Regulations and those recognized as being in accordance with NAFTA Article 905, for example, because of fundamental, climatic, geographical, te

27、chnological, or infrastructural factors, scientific justification, or the level of protection that the country considers appropriate. Presentation of the NEMA and CSA versions is to be word for word except for editorial changes. Reasons for Differences to IEC The Technical Harmonization Committee (T

28、HC) identified one IEC standard that addresses electrical cable tray systems included in the scope of this Standard. The THC determined the safe use of electrical cable tray is dependent on the design, performance, and installation of the cable tray system. The IEC standard does not mention the equi

29、pment grounding function of cable tray, and there are no requirements for corrosion protection at this time. Significant investigation is required to assess safety and system issues that may lead to harmonization of traditional North American electrical cable tray standards with those presently addr

30、essed in the known IEC standard. The THC agreed such future investigation might be facilitated by completion of harmonization of the North American standards for electrical cable tray. Interpretations The interpretation by the Standards Development Organization (SDO) of an identical or equivalent st

31、andard is to 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 is to be proposed as soon as possible to each of the SDOs to more accurately ref

32、lect the intent. CSA Effective Date The effective date for CSA will be announced through CSA Informs or a CSA Certification Notice. NEMA Effective Date The effective date for NEMA will be the publication date. NEMA VE 1-2009/CSA C22.2 No. 126.1-09 Page iv Foreword (NEMA) This Standards Publication p

33、rovides technical requirements concerning the construction, testing, and performance of metal cable tray systems. The development of this publication is the result of many years of research, investigation, and experience by the members of the Cable Tray Section of NEMA. Throughout the development of

34、 this publication, test methods and performance values have been related as closely as possible to end-use applications. It has been developed through consultation among manufacturers, with users and engineering societies, to result in improved serviceability and safety of metal cable tray systems.

35、This publication reflects the study of applicable building codes and the National Electrical Code, and adheres to applicable national material and manufacturing standards, such as those of the American Society for Testing and Materials, the American Iron and Steel Institute, the Aluminum Association

36、, and Underwriters Laboratories, Inc. The NEMA Cable Tray Section periodically reviews this publication for any revisions necessary, to keep it up to date with advancing technology. Comments or recommended revisions are welcomed and should be submitted to: Vice President, Technical Services National

37、 Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 The primary purpose of this Standards Publication is to encourage the manufacture and utilization of standardized metal cable tray systems and to eliminate misunderstandings between manufacturers and use

38、rs. The cable tray system manufacturer has limited or no control over the following factors, which are vital to a safe installation: a. environmental conditions; b. system design; c. product selection and application; d. installation practices; and e. system maintenance. This Standards Publication w

39、as developed by the Cable Tray Section, and has been promulgated with a view toward promoting safety of persons and property by the proper selection and use of metal cable tray systems. At the time it was approved, the Cable Tray Section was composed of the following members: Cablofil, Inc.Mascoutah

40、, IL Chalfant Manufacturing CompanyCleveland, OH Cooper B-LineHighland, IL Cope/Allied Electrical GroupHarvey, IL MP Husky CorporationGreenville, SC P-W Industries, Inc.Atlanta, GA The Wiremold CompanyWest Hartford, CT Thomas NOTEFabricated products that are hot-dip galvanized are thoroughly cleaned

41、, fluxed, and immersed in a bath of molten zinc, where they react to form a metallurgically bonded zinc coating. Normal oxidation of the galvanized surfaces will, in a short period of time, appear as a dull gray or white coating. Some degree of roughness and variations of thicknesses can be expected

42、 as a result of the hot-dipping process. Because the galvanizing process takes place at the low end of the stress-relieving temperature range, some stress relief occurs, and some distortion or warping may result. (b) Type 2Hot-dip mill galvanizing in accordance with ASTM A 653 / A 653M, coating desi

43、gnation G90; NOTEHot-dip mill galvanized coatings are produced by continuously rolling steel sheets or strips in coils through a bath of molten zinc. The process involves pretreating the steel to make the surface react readily with molten zinc as the strip moves through the bath at high speeds. Duri

44、ng fabrication, where slitting, forming, cutting, or welding is performed, the cut edges and heat-affected zone of welding are subject to superficial oxidation. These areas are then protected through electrolytic action of the adjacent zinc surfaces. The coating is smooth, ductile, and adherent. NOT

45、EFor corrosive or wet locations, other coatings may be more suitable. (c) Type 3Electrodeposited zinc in accordance with ASTM B 633 (SC 2 minimum); or NOTEFabricated products that are to receive electrodeposited zinc (zinc plated) coatings are thoroughly cleaned and then a thin layer of zinc is depo

46、sited by electrolysis. A conversion coating can then be applied to the zinc surface, resulting in a colored (typically yellow) or colorless (clear-blue) appearance. Electrodeposited zinc is a common indoor finish for wire mesh cable trays. For corrosive or wet locations, other coatings or materials

47、may be more suitable. (d) Other coatings as appropriate for the application. Where a nationally recognized standard exists, the coating shall be applied in accordance with that standard. 4.2.2 For installations in highly corrosive environments, such as alkaline or acidic conditions, different or add

48、itional protective coatings may be provided, as agreed to between the end user and the manufacturer. 4.2.3 Carbon steel nuts and bolts shall be protected against corrosion by one of the following processes: (a) Zinc electroplating in accordance with ASTM B 633; or (b) other coatings as appropriate f

49、or the application. Where a nationally recognized standard exists, the coating shall be applied in accordance with that standard. NEMA VE 1-2009/CSA C22.2 No. 126.1-09 Page 6 4.3 TYPICAL DIMENSIONS 4.3.1 General Clauses 4.3.2 to 4.3.7 provide the typical dimensions used in the industry. Other dimensions shall also be acceptable. Dimensions are based on rationalized conversions. 4.3.2 Lengths of Straight Sections Typical lengths, not including connectors, are: (a) 3 m 5 mm (10 ft 3/16 in.); (b) 3.66 m 5 mm (12 ft 3/16 in.); (c) 6 m 9 mm (20 ft 5/16 in.);