NEMA VE 1-2017 Metal Cable Tray Systems.pdf

1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA VE 1-2017Metal Cable Tray SystemsNEMA Standards Publication VE 1-2017 CSA Group Publication CSA C22.2 No. 126.1-17 Metal Cable Tray Systems Published by: National Electrical Manufacturers Association 1300 North 17thStreet, S

2、uite 900 Rosslyn, Virginia 22209 www.nema.org In Canada, published by: CSA Group 178 Rexdale Boulevard Toronto, ON, Canada M9W 1R3 www.csa.ca 2017 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention,

3、 the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. Commitment for Amendments This standard is issued jointly by Canadian Standards Association (operating as “CSA Group”) and the National Electrical Manufacturers Asso

4、ciation (NEMA). Comments or proposals for revisions on any part of the standard may be submitted to CSA Group or NEMA at any time. Revisions to this standard will be made only after processing according to the standards development procedures of CSA Group and NEMA. CSA Group and NEMA will issue revi

5、sions to this standard by means of a new edition or revised or additional pages bearing their date of issue. 2017 National Electrical Manufacturers Association NOTICE AND DISCLAIMER (NEMA) The information in this publication was considered technically sound by a consensus among persons engaged in it

6、s development at the time it was approved. Consensus does not necessarily mean there was unanimous agreement among every person participating in the development process. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document herein is one

7、, are developed through a voluntary standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. Although NEMA administers the process and establishes rules to promote fairness in the devel

8、opment of consensus, it does not write the documents, nor does it independently test, evaluate, or 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, propert

9、y, or other damages of any nature, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy or complete

10、ness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any particular purpose(s) or need(s). NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services by virtue of thi

11、s standard or guide. In publishing and making this document available, NEMA is not 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 shoul

12、d rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstance. Information and other standards on the topic covered by this publication may be available from other sources, which

13、the user may wish to consult for additional views 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 hea

14、lth purposes. Any certification or other statement of compliance with any health- or safety-related 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 1-2017/CSA C22.2 No. 126.1-17 Page i 2017 National E

15、lectrical Manufacturers Association CONTENTS Preface iii Foreword (NEMA) . iv Section 1 Scope 1 Section 2 Definitions, Abbreviations, and Acronyms . 2 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 4.2.1 Carbo

16、n Steel Corrosion Protection 5 4.2.2 Highly Corrosive Environments . 5 4.2.3 Carbon Steel Nut and Bolt Corrosion Protection . 6 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 4.3.5 Nominal Rung Spacings on Straight Sections. 7 4.3.6

17、 Inside Radii 8 4.3.7 Degrees of Arc for Elbows . 8 4.4 Quality of Work 8 4.5 Fittings . 8 4.6 Fasteners . 8 4.7 Bonding 8 4.7.1 Connection Means . 8 4.7.2 Measured Resistance 8 4.8 Load Capacity 8 4.8.1 Straight Section Requirements 8 4.8.2 Concentrated Static Load 9 4.8.3 Channel Cable Tray Straig

18、ht Sections Load-Testing (Optional) . 9 Section 5 Tests . 10 5.1 Electrical Continuity of Connections 10 5.2 Load Testing 10 5.2.1 General 10 5.2.2 Test Specimen . 10 5.2.3 Type and Length of Span 10 5.2.4 Orientation Of Specimen . 10 5.2.5 Supports 10 5.2.6 Loading Material 11 5.2.7 Load Applicatio

19、n 11 5.2.8 Loading to Destruction . 12 5.3 Interpolation Of Test Data . 12 5.4 Rung Load Capacity (Optional) . 12 5.4.1 General 12 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 NEMA VE 1-2017/CSA C22.2 No. 126.1-17 Page ii 2017

20、 National Electrical Manufacturers Association 5.4.6 Loading 13 5.4.7 Load Capacity 13 5.4.8 Interpolation of Rung Load Test Data . 13 Section 6 Product Marking, Information, And Installation . 14 6.1 Marking on Product . 14 6.1.1 Dimensions and Measurements 14 6.1.2 Straight Section and Fitting Mar

21、king . 14 6.2 Product Information . 14 6.3 Cable Tray Installation . 14 Annex A MarkingsFrench Translations (Informative) 17 Annex B Span/Load Class DesignationUSA (Informative) 18 Annex C Span/Load Class DesignationCanada (Informative) 19 Annex D Loading to Residual Deflection (Method B) 20 TABLES

22、Table 1 Acceptable French TranslationsRequired Markings 17 Table 2 Span/Load Class DesignationUSA (See Clauses 4.8.1, 4.8.2, and 6.1.2 (c) 18 Table 3 Span/Load Class DesignationCanada (See Clauses 4.8.1, 4.8.2 and 6.1.2(c) 19 FIGURES Figure 1 Illustration of Selected Definitions (See Clause 2.1) 15

23、Figure 2 Application of LoadRung Load Capacity (See Clause 5.4.2) . 16 NEMA VE 1-2017/CSA C22.2 No. 126.1-17 Page iii 2017 National Electrical Manufacturers Association Preface This is the harmonized CSA Group and NEMA standard for Metal Cable Tray Systems. It is the fourth edition of CSA C22.2 No.

24、126.1, superseding the previous editions published in 2009, 2002, and 1998, and the sixth edition of NEMA VE 1, superseding the previous edition published in 2009. This harmonized standard was prepared by the CANENA Technical Harmonization Committee for Metal Cable Tray Systems, comprising members f

25、rom CSA Group, the National Electrical Manufacturers Association, and the cable tray manufacturing industry. The efforts and support of the CANENA Technical Harmonization Committee are gratefully acknowledged. This standard is considered suitable for use for conformity assessment within the stated s

26、cope of the standard. This standard was reviewed by the CSA Integrated Committee on Cable Tray Systems, under the jurisdiction of the CSA Technical Committee on Wiring Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA T

27、echnical Committee. This standard was also approved at NEMA by the Codes and Standards Committee. Where reference is made to a specific number of samples to be tested, the specified number is considered to be a minimum quantity. Note: Although the intended primary application of this standard is sta

28、ted 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 not based on, nor is it to be considered equivalent to, an IEC standard. Th

29、is standard is published as an identical standard for NEMA and CSA Group. An identical standard is a standard that is exactly the same in technical content except for national differences resulting from conflicts in codes and governmental regulations. Presentation is word for word except for editori

30、al changes. Reasons for Differences from IEC The Technical Harmonization Committee (THC) 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,

31、and installation of the cable tray system. The IEC standard does not mention the bonding/equipment 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 harmoniz

32、ation of traditional North American electrical cable tray standards with those presently addressed 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 in

33、terpretation by the Standards Development Organization (SDO) 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 the SDO. If more than one interpretation of the literal text has been identified

34、, a revision is to be proposed as soon as possible to each of the SDOs to reflect more accurately the intent. NEMA VE 1-2017/CSA C22.2 No. 126.1-17 Page iv 2017 National Electrical Manufacturers Association Foreword (NEMA) This standards publication provides technical requirements concerning the con

35、struction, 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 this publication, test methods and performance v

36、alues 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. This publication reflects the study of applicable

37、 building codes and the Canadian Electrical Code, Part I (CE Code) and the National Electrical Code (NEC), 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 Ass

38、ociation, 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 and suggestions for the improvement of this document are encouraged. They should be sent to: Senior T

39、echnical Director, Operations National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 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 misunderst

40、andings between manufacturers and users. It has been promulgated with a view toward promoting safety of persons and property by the proper selection and use of metal cable tray systems. The cable tray system manufacturer has limited or no control over the following factors, which are vital to a safe

41、 installation: a. environmental conditions; b. system design; c. product selection and application; d. installation practices; and e. system maintenance. NEMA VE 1 was developed by the NEMA Cable Tray Section. Section approval does not necessarily imply that all section members voted for approval or

42、 participated in development. At the time NEMA VE 1-2017 was approved, the NEMA Cable Tray Section consisted of the following members: Cope, A part of Atkore International Chalfant Manufacturing Co. Eatons B-Line Business Legrand/Cablofil, Inc. www.legrand.us/cablofil MP Husky Corp. Oglaend Syst

43、em US LLC www.oglaend- Snake Tray, Inc. TechLine Manufacturing Thomas Note: Fabricated products that are hot-dip galvanized are thoroughly cleaned, fluxed, and immersed in a bath of molten zinc, where they react to form a metallurgically bonded zinc coating. Normal oxidation of the galvanized surf

44、aces 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 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 stre

45、ss relief occurs, and some distortion or warping can result. b. Type 2Hot-dip mill galvanizing in accordance with ASTM A653 / A653M, coating designation G90; Note: Hot-dip mill galvanized coatings are produced by continuously rolling steel sheets or strips in coils through a bath of molten zinc. The

46、 process involves pretreating the steel to make the surface react readily with molten zinc as the strip moves through the bath at high speeds. During fabrication, where slitting, forming, cutting, or welding is performed, the cut edges and heat-affected zone of welding are subject to superficial oxi

47、dation. These areas are then protected through electrolytic action of the adjacent zinc surfaces. The coating is smooth, ductile, and adherent. Note: For corrosive or wet locations, other coatings could be more suitable. c. Type 3Electrodeposited zinc in accordance with ASTM B633 (SC 2 minimum); or

48、Note: Fabricated products that are to receive electrodeposited zinc (zinc plated) coatings are thoroughly cleaned and then a thin layer of zinc is deposited by electrolysis. A conversion coating can then be applied to the zinc surface, resulting in a colored (typically yellow) or colorless (clear-bl

49、ue) appearance. Electrodeposited zinc is a common indoor finish for wire mesh cable trays. For corrosive or wet locations, other coatings or materials could be more suitable. d. Zinc coatings other than those listed above, and coatings other than zinc, are appropriate for the application. Where a nationally recognized standard exists, the coating shall be applied in accordance with