NEMA FB 2 40-2016 Installation Guidelines for Expansion and Expansion Deflection Fittings.pdf
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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA FB 2.40-2016Installation Guidelines for Expansion and Expansion/Deflection Fittings 2016 National Electrical Manufacturers Association NEMA FB 2.40-2016 Installation Guidelines for Expansion and Expansion/Deflection Fittings
2、 Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, VA 22209 www.nema.org 2016 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Conve
3、ntion for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. 2016 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by a consensus among persons engaged in
4、 its 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
5、one, 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 de
6、velopment 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, prop
7、erty, 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 compl
8、eteness 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
9、this 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 sh
10、ould 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, whi
11、ch 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
12、health 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 FB 2.40-2016 Page i 2016 National Electrical Manufac
13、turers Association CONTENTS Foreword . iii Introduction . iv Section 1 General 1 1.1 Scope 1 1.2 Nomenclature and definitions 1 1.3 References 2 1.3.1 Standards and guidelines 2 1.3.2 Electrical codes . 3 Section 2 Seismic Issues . 4 Section 3 Hazardous Locations . 5 Section 4 Raceway Expansion Rela
14、tive to Building Materials . 6 Section 5 Installation 7 5.1 Aboveground . 7 5.1.1 Setting the piston. 7 5.1.2 Allowing travel for the raceway systems . 8 5.1.3 Expansion fitting placement 9 5.1.4 Expansion fittings in the vertical position 9 5.1.5 Wire inside conduit 9 5.2 Belowground . 9 5.2.1 Dire
15、ct burial . 9 5.2.2 Encased burial . 10 5.2.3 Temporary open trenches . 10 5.2.4 Building/structural joints 10 5.2.5 Wet and dry locations 11 5.2.6 Ground settlement . 11 5.2.7 Grounding/bonding 12 5.3 Mounting on live vegetation 12 Section 6 How Expansion and Expansion/Deflection Fittings Work . 13
16、 6.1 Description 13 6.2 Design . 13 6.2.1 Expansion and expansion/deflection fittings used with RMC, IMC or EMT 13 6.2.2 Expansion and expansion/deflection fittings used with RNC, RTRC, or ENT 14 Section 7 Using Expansion Fittings to Repair PVC and RTRC 15 7.1 General 15 7.2 Repair procedure 15 Sect
17、ion 8 Storage and Handling 18 8.1 Handling and storage of expansion and expansion/deflection fittings 18 8.2 Handling 18 8.3 Storage 18 8.4 Inventory rotation 18 Appendix A Relevant Standards . A-1 Appendix B Raceway Expansion Characteristics . B-1 B.1 Rigid polyvinyl chloride (PVC) conduit B-1 B.1.
18、1 Coefficient of thermal expansion . B-1 B.1.2 Calculation examples B-1 B.2 Reinforced thermosetting resin conduit (RTRC) . B-3 B.2.1 Coefficient of thermal expansion . B-3 B.2.2 Calculation of expansion allowance B-3 B.3 Metal conduit and tubing . B-3 B.3.1 Coefficient of thermal expansion . B-3 B.
19、3.2 Calculation of expansion allowance B-3 NEMA FB 2.40-2016 Page ii 2016 National Electrical Manufacturers Association FIGURES Figure 1 Cracking of conduit . 6 Figure 2 Conduit joints separated . 6 Figure 3 Piston settings . 7 Figure 4 Piston and barrel separation from improperly set piston 8 Figur
20、e 5 Improperly secured expansion fitting 8 Figure 6 Use of one or multiple expansion fittings 9 Figure 7 Expansion/deflection fittings . 10 Figure 8 Expansion/deflection fitting . 10 Figure 9 Structural joint . 11 Figure 10 Expansion/deflection fittings in bridge embankment 11 Figure 11 Example desi
21、gn for expansion fitting with RMS, IMT, or EMT . 13 Figure 12 Example design for expansion/deflection fitting used with RNC, IMC, or EMT 14 Figure 13 Example design, expansion fitting with RNC, RTRC, or ENT 14 Figure 14 Example design, expansion/deflection fitting with RNC, RTRC, or ENT 14 Figure 15
22、 Cutting damaged portion of raceway 15 Figure 16 Expansion fitting placement 16 Figure 17 Repair of larger raceway damage sections 16 Figure 18 Solvent cement or adhesive applied to replacement section and remaining raceway . 17 Figure 19 Completed raceway repair 17 Figure B-1 Setting of piston. B-3
23、 TABLES Table B-1 Expansion characteristics of rigid PVC conduit B-1 Table B-2 Expansion allowances for typical length of rigid PVC conduit . B-2 Table B-3 Expansion characteristics of reinforced thermosetting resin conduit (RTRC) B-4 Table B-4 Expansion characteristics of steel conduit and tubing .
24、 B-5 Table B-5 Expansion characteristics of aluminum conduit and tubing . B-5 NEMA FB 2.40-2016 Page iii 2016 National Electrical Manufacturers Association FOREWORD These guidelines were prepared by a joint sections committee of the Conduit Fittings (5FB), Steel Conduit and Electrical Metallic Tubin
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