NEMA VE 2-2013 Cable Tray Installation Guidelines (Incorporates Errata 02 08 2016).pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA VE 2-2013 (Incorporates Errata: 02/08/2016)Cable Tray Installation GuidelinesNEMA Standards Publication VE 2-2013 Cable Tray Installation Guidelines Endorsed by Cable Tray Institute Published by: National Electrical Manufac

2、turers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2013 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary

3、and Artistic Works, and the International and Pan American copyright conventions. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by a consensus among persons engaged in its development at the time it was approved. Consensus does not necessarily mean there

4、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, are developed through a voluntary standards development process. This process bring

5、s 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 development of consensus, it does not write the documents, nor does it independently test,

6、 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, property, or other damages of any nature, whether special, indirect, consequential, or compe

7、nsatory, 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 completeness of any information published herein, and disclaims and makes no warranty that th

8、e 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 this standard or guide. In publishing and making this document available, NEMA is not un

9、dertaking 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 of

10、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 the user may wish to consult for additional views or information not covered by this

11、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- or

12、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. VE 2-2013 Page i Copyright 2013 National Electrical Manufacturers Association CONTENTS Page FOREWORD . VII SECTION 1 SCOPE 1 1.1 Scope . 1 1.2 Ge

13、neral 1 1.3 Definitions, Abbreviations, and Acronyms . 1 1.4 References 3 1.4.1 Contacts. 4 1.5 RECEIVING AND UNLOADING 4 SECTION 2 STORAGE 6 SECTION 3 INSTALLATION 7 3.1 Cable Tray Installation Locations 7 3.2 Common Tools for Installation . 7 3.3 Support Installation 7 3.3.1 Cable Tray Supports 8

14、3.3.2 Wall and Cantilever Brackets 14 3.3.3 Floor and Roof Installations . 15 3.3.4 Vertical Installations . 15 3.3.5 Transverse Installations . 16 3.4 Straight Section Installation . 17 3.4.1 Straight Section Position . 17 3.4.2 Expansion Splice Plates 18 3.4.3 Vertical Adjustable Splice Plates . 2

15、0 3.4.4 Horizontal Adjustable Splice Plates . 21 3.4.5 Cable Tray to Box or Floor Splice Plates 21 3.4.6 Offset-Reducing Splice Plates . 22 3.4.7 Vertical Support Plates 23 3.4.1 Step-Down Splice Plates . 23 3.4.1 End Plates . 23 3.4.2 Single-Rail Cable Tray Fitting Connectors 23 3.5 Fittings Instal

16、lation . 24 3.5.1 Recommended Support Locations for Fittings 24 3.5.2 Extended Vertical Runs . 26 3.5.3 Recommended Support Locations for Single-Rail and Wire Mesh Cable Trays 27 3.6 Field Modifications . 27 3.6.1 Marking 27 3.6.2 Cutting . 27 3.6.3 Drilling 29 3.6.4 Finish Touch-Up 29 3.6.5 Wire Me

17、sh Fittings Fabrication 30 3.7 Accessories . 30 3.7.1 Barrier Strips 30 3.7.2 Drop-Outs 32 3.7.3 Cable Channel to Cable Tray 32 3.7.4 Conduit to Cable Tray Adaptors 33 3.7.5 Covers and Clamps . 33 3.8 Grounding and Bonding . 35 3.8.1 Cable Tray Used as an Equipment Ground Conductor (EGC) . 36 3.8.2

18、Cable Trays with Wire-Type Equipment Grounding Conductor (EGC) Installed 36 3.8.3 Check for Properly Sized EGC or Bonding Jumpers 37 3.8.4 How to Install Bonding Jumpers 39 3.9 Bonding to The Metal Frame of the Building and Earth 39 VE 2-2013 Page ii Copyright 2013 National Electrical Manufacturers

19、Association SECTION 4 INSTALLATION OF CABLE 40 4.1 General 40 4.2 Handling and Storage 40 4.3 Cable Tray Preparation . 40 4.4 Cable Pulling Considerations 40 4.5 Pulling the Cable . 41 4.6 Fastening Cables . 42 4.7 Protecting Installed Cable 43 SECTION 5 MAINTENANCE 44 5.1 Inspection 44 5.2 Inactive

20、 or Abandoned Cables 44 5.3 Adding Cables . 44 ANNEX A TYPICAL CABLE TRAY TYPES 45 A.1 Cable Ladders . 45 A.2 Single-Rail Cable Trays . 45 A.3 Solid-Bottom Cable Trays 46 A.4 Trough (Ventilated Cable Trays) . 46 A.5 Wire Mesh Cable Tray . 46 A.6 Channel Cable Trays . 47 TABLES Page Table 3-1 Fastene

21、r Torque . 17 Table 3-2 Maximum Spacing between Expansion Joints that Provide for 250 mm (1 in) Movement* 19 Table 3-3 Quantity of Standard Cover Clamps Required . 35 Table 3-4 Metal Area Requirements for Cable Tray Systems Used as Equipment Grounding Conductors (NEC Table 392.60(A) 38 Table 3-5 Min

22、imum Size Equipment Grounding Conductors for Grounding Raceway and Equipment (NEC Table 250.122) 39 FIGURES Page Figure 1-1 Correct . 5 Figure 1-2 Not CorrectExcept when Using Extended Forks for Skidded Bundles 5 Figure 1-3 Correct . 5 Figure 1-4 Incorrect . 5 Figure 3-1 Strut Nut . 9 Figure 3-2 C-C

23、hannel Support 9 Figure 3-3 Strut Support 9 Figure 3-4 Angle Iron Support . 9 Figure 3-5 Typical Strut Support Installation . 9 Figure 3-6 Strut (Exploded View) 9 Figure 3-7 Hold Downs . 10 Figure 3-8 Single Cable Tray Hanger . 10 VE 2-2013 Page iii Copyright 2013 National Electrical Manufacturers A

24、ssociation Figure 3-9 Double Cable Tray Hanger 10 Figure 3-10 Single Cable Tray Hanger . 11 Figure 3-11 Double Cable Tray Hanger 11 Figure 3-12 Single Cable Tray Hanger . 12 Figure 3-13 Center Hanger Support . 12 Figure 3-14 Center Hanger Support . 12 Figure 3-15 Single Channel Hanger . 13 Figure 3-

25、16 Double Channel Hanger 13 Figure 3-17 Multiple Splice Support 14 Figure 3-18 Rod through Spine Hanger 14 Figure 3-19 Clevis Hanger 14 Figure 3-20 Single Strut Cantilever Bracket 14 Figure 3-21 Gusset Cantilever Bracket . 14 Figure 3-22 Fiberglass Cantilever Bracket 15 Figure 3-23 Single-Rail Direc

26、t Wall Mount 15 Figure 3-24 Single-Rail Clamp Wall Mount . 15 Figure 3-25 Elevated Strut-Type Support . 15 Figure 3-26 Underfloor Support Attached to Floor Pedestals . 15 Figure 3-27 Single-Rail Floor Support 15 Figure 3-28 Vertical Threaded Rod Support . 15 Figure 3-29 Vertical Gusset Cantilever Su

27、pport . 15 Figure 3-30 Vertical Threaded Rod Support . 16 Figure 3-31 Vertical Gusset Cantilever Support . 16 Figure 3-32 Horizontal Wall Mount . 16 Figure 3-33 Horizontal Strut Support 16 Figure 3-34 Cable Tray Support Locations . 17 Figure 3-35 Cable Tray Installation . 18 Figure 3-36 Cable Tray I

28、nstallation . 18 Figure 3-37 Splice Plate Attachment 18 Figure 3-38 Expansion Splice Plate Attachment 18 Figure 3-39 Hold-Down and Guide Clamp Locations . 19 Figure 3-40 Gap Setting of Expansion Splice Plate25.4 mm (1 in) Gap Maximum* . 20 Figure 3-41 Two-Bolt Vertical Adjustable Splice Plates 21 Fi

29、gure 3-42 Single-Bolt Vertical Adjustable Splice Plates 21 Figure 3-43 Horizontal Adjustable Splice Plates . 21 Figure 3-44 Cable Tray to Box/Floor Splice Plates . 22 Figure 3-45 Cable Tray to Box Connector 22 VE 2-2013 Page iv Copyright 2013 National Electrical Manufacturers Association Figure 3-46

30、 Offset-Reducing Splice Plate . 22 Figure 3-47 Vertical Support Plates 23 Figure 3-48 Step-Down Splice Plates . 23 Figure 3-49 End Plate . 23 Figure 3-50 Horizontal Tee or 90 Connector . 23 Figure 3-51 Horizontal Cross Connector 23 Figure 3-52 Horizontal Hub . 24 Figure 3-53 Vertical Tee or 90 Conne

31、ctor . 24 Figure 3-54 Horizontal Elbows 25 Figure 3-55 Horizontal Tee . 25 Figure 3-56 Horizontal Wye 25 Figure 3-57 Horizontal Cross 25 Figure 3-58 Reducer . 25 Figure 3-59 Vertical Elbows (Side View) . 26 Figure 3-60 Vertical Tee (Side View) 26 Figure 3-61 Vertical Cable Support . 26 Figure 3-62 V

32、ertical Cable Support . 26 Figure 3-63 Marking the Flanges 27 Figure 3-64 Marking the Web of the Rail 27 Figure 3-65 Cutting with Hand-Held Hack Saw . 28 Figure 3-66 Cutting with Bolt Cutters 28 Figure 3-67 Correct Cut 28 Figure 3-68 Correct Blades to Use . 28 Figure 3-69 Correct Blade Placement . 2

33、8 Figure 3-70 Incorrect Cut 29 Figure 3-71 Incorrect Blades to Use . 29 Figure 3-72 Incorrect Blade Placement 29 Figure 3-73 Drilling with Drill Jigs 29 Figure 3-74 Drilling with Punched Side Rail 29 Figure 3-75 Drilling with Clamp and Side Rail 29 Figure 3-76 Typical Wire Mesh FittingsField-Fabrica

34、ted . 30 Figure 3-77 Barrier StripStraight Section 31 Figure 3-78 Barrier StripHorizontal Fitting . 31 Figure 3-79 Barrier StripVertical Fitting . 31 Figure 3-80 Barrier Strip Application . 31 Figure 3-81 Barrier Strip AttachmentSelf-Drilling and Self-Tapping Screw 31 Figure 3-82 Barrier Strip Attac

35、hmentClip 31 VE 2-2013 Page v Copyright 2013 National Electrical Manufacturers Association Figure 3-83 Barrier Strip Slice Barrier . 32 Figure 3-84 Barrier Strip SpliceInstalled 32 Figure 3-85 Ladder Drop-Out 32 Figure 3-86 Trough Drop-Out . 32 Figure 3-87 Trough Drop-Out Bushing . 32 Figure 3-88 Ca

36、ble Tray to Channel . 33 Figure 3-89 Channel to Ladder Tray Bracket 33 Figure 3-90 Installed Conduit to Cable Tray Adapter . 33 Figure 3-91 Swivel Conduit to Cable Tray Adapter 33 Figure 3-92 Conduit to Cable Tray Adapter 33 Figure 3-93 Cable Tray Covers . 34 Figure 3-94 Cable Tray Cover Clamps and

37、Accessories 35 Figure 3-95 Expansion Splice Plates 36 Figure 3-96 Horizontal Adjustable Splice Plates . 36 Figure 3-97 Discontinuous 36 Figure 3-98 Cable Tray Sections Vertical Adjustable Splice Plate . 36 Figure 3-99 Grounding Clamps . 37 Figure 3-100 Bonding Jumper Examples 39 Figure 4-1 Cable Ins

38、tallation . 41 Figure 4-2 Pulling Eye . 42 Figure 4-3 Pulling Bolt . 42 Figure 4-4 Straight Roller (Top Mounted) . 42 Figure 4-5 Triple Pulley Guide 42 Figure 4-6 90 Roller . 42 Figure 4-7 Cable TiesVertical Application . 43 Figure 4-8 Cable TiesHorizontal Application . 43 Figure A-1 I-Beam . 45 Fig

39、ure A-2 C-Channel Flange In . 45 Figure A-3 C-Channel Flange Out 45 Figure A-4 Center Rail Cable Tray 45 Figure A-5 Single-Tier Wall Mount 45 Figure A-6 Multi-Tier Wall Mount 45 Figure A-7 Pan Flange In 46 Figure A-8 Pan Flange Out . 46 Figure A-9 Corrugated Bottom 46 Figure A-10 Solid Sheet on Top

40、of Ladder Rung 46 Figure A-11 Corrugated Bottom with Holes 46 VE 2-2013 Page vi Copyright 2013 National Electrical Manufacturers Association Figure A-12 Pan with Louvers . 46 Figure A-13 Tray with Close Rung Spacing 46 Figure A-14 Wire Mesh . 46 Figure A-15 Ventilated Bottom 47 Figure A-16 Solid Bot

41、tom 47 VE 2-2013 Page vii Copyright 2013 National Electrical Manufacturers Association FOREWORD For Cable Tray Installers: NEMA VE 2-2013 (hereinafter referred to as NEMA VE 2) is intended as a practical guide for the proper installation of cable tray systems. Cable tray system design shall comply w

42、ith National Electrical Code(NEC) Article 392, NEMA VE 1, and NEMA FG 1 and follow safe work practices as described in NFPA 70E. NEMA VE 2 guidelines and information do not intend to cover all details or variations in cable tray systems nor provide for every possible installation contingency. Constr

43、uction Experience: It is recommended that the work described be performed by qualified persons familiar with standard electrical construction practices, electrical equipment, and safety of electrical wiring systems. NEMA VE 2 guidelines are useful to engineers, contractors, and maintenance personnel

44、. In future, NEMA VE 2 will be updated periodically to reflect evolving technology and construction techniques. Comments and suggestions for the improvement of this document are encouraged. They should be sent to: Senior Technical Director, Operations National Electrical Manufacturers Association 13

45、00 North 17th Street, Suite 900 Rosslyn, Virginia 22209 This is the fourth edition of NEMA VE 2. NEMA VE 2 was developed by the NEMA Cable Tray Section. Section approval does not necessarily imply that all section members voted for approval or participated in development. At the time NEMA VE 2 was a

46、pproved, the NEMA Cable Tray Section consisted of the following members: ABB/Thomas cable tray is a mechanical support system for cables and raceways. Using cable trays as walkways can cause personal injury and can damage cable tray and installed cables. Hazardous voltages in electrical equipment ca

47、n cause severe personal injury or death. Safety-related work practices, such as those described in NFPA 70E or CSA Z462, as well as all applicable OSHA regulations should be followed at all times. Performance of a cable tray wiring system depends on proper installation, including supports and cables

48、. Neglecting installation and maintenance guidelines may lead to personal injury as well as damage to property. Installation and maintenance of cable tray wiring systems shall be conducted only by qualified personnel. For the purposes of this guideline, a qualified person is one who is familiar with

49、 electrical construction. In addition, that person is: a) Trained and authorized to test, energize, clear, ground, tag, and lock out circuits, in accordance with established safety practices, and b) Trained in the proper care and use of protective equipment, such as insulated rubber gloves, hard hats, safety glasses or face shields, dust masks, and flash-resistant clothing, in accordance with established safety practices. 1.3 DEFINITIONS, ABBREVIATIONS, AND ACRONYMS The following definitions, abbreviations, and acronyms appear in NEMA VE