NEMA RV 2-2016 Application and Installation Guidelines for Nonmetallic-Sheathed Cable and Underground Feeder and Branch Circuit Cable.pdf
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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA RV 2-2016Application and Installation Guidelines for Nonmetallic-Sheathed Cable and Underground Feeder and Branch Circuit CableNEMA RV 2-2016 Application and Installation Guidelines for Nonmetallic-Sheathed Cable and Undergr
2、ound Feeder and Branch Circuit Cable Published by: National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2016 National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Univers
3、al Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. National Electrical Code(NEC) excerpts shown herein are reprinted with permission from NFPA 70-2017, NEC, 2016 National Fire Protection Assoc
4、iation, Quincy, Mass. This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of per
5、sons 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 person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards an
6、d guideline publications, of which the document contained herein is one, are developed through a voluntary consensus 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. While NEMA
7、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, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and g
8、uideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disc
9、laims 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 the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee
10、 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 not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to
11、 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 a competent professional in determining the exercise of reasonable care in any given circumstances. Information and oth
12、er 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 publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this docume
13、nt. 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 safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the
14、certifier or maker of the statement. NEMA RV 2-2016 Page i 2016 National Electrical Manufacturers Association CONTENTS Foreword iii Section 1 Application Guidelines for Nonmetallic-Sheathed Cable 1 1.1 Construction. 1 1.1.1 General 1 1.1.2 Circuit Conductors . 1 1.1.3 Grounding Conductor 1 1.1.4 Cab
15、le Sheath . 1 1.2 Grounding 2 1.3 Marking and Identification 2 1.3.1 Finished Cable . 2 1.3.2 Grounding Conductors 2 1.3.3 Size Identification 2 1.4 Codes and Standards 2 1.4.1 National Electrical Code(NEC) . 2 1.4.1.1 Uses Permitted 2 1.4.1.2 Additional Permitted Uses of Type NM Cable 3 1.4.1.3 Use
16、s Not Permitted 3 1.4.1.4 Related NEC Articles 3 1.4.1.5 UL Certification Category Guide Information and Certifications on Website 5 Section 2 Application Guidelines for Underground Feeder and Branch Circuit Cable . 7 2.1 Construction. 7 2.1.1 General 7 2.1.2 Circuit Conductors . 7 2.1.3 Grounding C
17、onductors 7 2.1.4 Cable Sheath . 7 2.2 Grounding 8 2.3 Marking and Identification 8 2.3.1 Finished Cable . 8 2.3.2 Grounding Conductors 8 2.3.3 Jacket Color . 8 2.4 Codes and Standards 8 2.4.1 National Electrical Code(NEC) . 8 2.4.1.1 Uses Permitted 8 2.4.1.2 Uses Not Permitted 8 2.4.1.3 Additional
18、Information on the Use of UF Cables 9 2.4.1.3.1 Bending Radius 9 2.4.1.3.2 Ampacity 9 2.4.1.4 Related NEC Articles 9 2.4.2 UL Standards and Directories . 10 2.4.2.1 UL Standards 10 2.4.2.2 UL Directories 10 Section 3 Installation Guidelines for Nonmetallic-Sheathed Cable and Underground Feeder and B
19、ranch-Circuit Cable . 13 3.1 General 13 3.2 Inserting the Cable 13 3.3 Cable Preparation 13 3.4 Seating a Securement Clamp 13 3.5 Screw Tightening Torque 13 3.6 Supports 14 3.6.1 Required Intervals . 14 NEMA RV 2-2016 Page ii 2016 National Electrical Manufacturers Association 3.6.1.1 Type NM-B Cable
20、 14 3.6.1.2 Type UF-B Cable 14 3.6.2 Installation in Metal Framing Members . 14 3.6.3 Installation in Wood Framing Members . 14 3.7 Securing NM-B or UF-B at Nonmetallic Boxes Without Cable Clamps. 15 3.8 Underground Installations for UF-B . 15 3.9 Special Installation Considerations . 15 3.9.1 Expos
21、ed Work . 15 3.9.2 Unfinished Basements and Crawl Spaces 15 3.9.3 Accessible Attics 15 3.9.4 Corrosive Locations . 15 3.9.5 Solar Photovoltaic Systems . 15 3.10 Bending Radius . 16 3.11 Unsupported Cable 16 3.12 Ampacity 16 3.13 Damage . 16 3.13.1 Physical Damage . 16 3.13.2 Flood Damage . 16 3.14 V
22、erification of Installation . 16 TABLES 1-1 Grounding Conductors in NM-B Cables with 2, 3, or 4 Circuit Conductors 1 2-1 Grounding Conductors in UF-B Cables with 2, 3, or 4 Circuit Conductors . 7 FIGURES 1 Common Cable Support and Protection Product 18 2 Positioning Cables Under Staples . 19 NEMA RV
23、 2-2016 Page iii 2016 National Electrical Manufacturers Association Foreword These application and installation guidelines offer practical information on correct usage and industry-recommended practices for installation of Type NM-B nonmetallic-sheathed cable and Type UF-B underground feeder and bra
24、nch circuit cable in accordance with the National Electrical Code(NEC). These guidelines have been developed by the NEMA Building Wire and Cable Group and Dues Center, which has committed to periodically reviewing them for any revisions necessary to address changing conditions, product listing and i
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