NEMA RV 4-2012 Application and Installation Guidelines for Service-Entrance Cable.pdf

1、 NEMA RV 4-2012 Application and Installation Guidelines for Service-Entrance Cable NEMA Standard RV 4-2012 Application and Installation Guidelines for Service-Entrance Cable Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema

2、.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 and Artistic Works, and the International and Pan American copyright conventions. NO

3、TICE 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 was unanimous agreement among every person participating in the development process.

4、 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 brings together volunteers and/or seeks out the views of persons who have an interest in

5、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, evaluate, or verify the accuracy or completeness of any information or the soundnes

6、s 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 compensatory, directly or indirectly resulting from the publication, use of, application,

7、 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 the information in this document will fulfill any particular purpose(s) or need(s). NE

8、MA 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 undertaking to render professional or other services for or on behalf of any person or

9、 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 a competent professional in determining the exercise of reasonable care in any given

10、 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 publication. NEMA has no power, nor does it undertake to police or enforce complianc

11、e 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 safety-related information in this document shall not be attributable to NEMA and is

12、 solely the responsibility of the certifier or maker of the statement. RV 4-2012 Page iii 2013 National Electrical Manufacturers Association CONTENTS Page FOREWORD IV APPLICATION GUIDELINES FOR SERVICE-ENTRANCE CABLE 1 SECTION 11.1 CONSTRUCTION 1 1.1.1 General 1 1.1.2 Insulated Conductors . 1 1.1.3

13、Grounding Conductors 1 1.1.4 Separators . 1 1.1.5 Fillers . 1 1.1.6 Coverings. 1 1.2 GROUNDING 2 1.2.1 Grounding Conductor 2 1.2.2 Polarity . 2 1.3 MARKING 2 1.3.1 General 2 1.3.2 Cable, Tag, or Package . 2 1.3.3 Circuit Conductors . 2 1.3.4 Grounding Conductors 2 1.4 CODES AND STANDARDS 2 1.4.1 Nat

14、ional Electrical Code (NEC) 2 1.4.2 Underwriters Laboratories (UL) Standards and Directory . 4 INSTALLATION GUIDELINES FOR TYPE SE CABLE 7 SECTION 22.1 NEC REQUIREMENTS FOR INSTALLATION OF SERVICE-ENTRANCE CONDUCTORS. 7 2.2 PRACTICES FOR INSTALLING SERVICE-ENTRANCE CABLES AS BRANCH CIRCUITS OR FEEDE

15、RS . 10 2.2.1 Cable Preparation 10 2.2.2 Inserting the Cable 10 2.2.3 Cable Preparation 11 2.2.4 Seating a Securement Clamp . 11 2.2.5 Screw-Tightening Torque 11 2.2.6 Supports 11 2.2.7 Securing and Supporting . 11 2.2.8 Special Installation ConsiderationsExposed Work 11 2.2.9 Unfinished Basements a

16、nd Crawl Spaces 12 2.2.10 Accessible Attics 12 2.2.11 Unsupported Cable 12 2.2.12 Ampacity 12 2.2.13 Damage . 12 INSTALLATION TECHNIQUES . 13 SECTION 33.1 CABLE PREPARATION AND FITTING ASSEMBLY TECHNIQUE . 13 3.1.1 Inserting SE Cable . 13 3.1.2 Cable Preparation 13 3.1.3 Seating a Securement Clamp .

17、 13 3.1.4 Screw-Tightening Torque 14 3.2 ATTACHMENT TO BOXES AND SUPPORT . 14 3.2.1 Attachment to Unthreaded Entries 14 3.2.2 Attachment to Threaded Entries 14 3.2.3 Supports 14 3.3 VERIFICATION OF INSTALLATION . 15 3.4 MAINTENANCE 16 RV 4-2012 Page iv 2013 National Electrical Manufacturers Associat

18、ion FOREWORD These application and installation guidelines offer practical information on correct usage and industry-recommended practices for service-entrance cable installation in accordance with the National Electrical Code (NEC). They address service masts, sunlight resistance, submerged cables,

19、 conduit markings, aerial installation, suitability for branch and feeder circuits, termination requirements in wet locations, and important changes to the 2011 NEC. These guidelines were developed by the National Electrical Manufacturers Associations (NEMA) Building Wire and Cable Section, which ha

20、s committed to periodically reviewing them for any revisions necessary to address changing conditions, product listing and installation requirements, and technical progress. Comments and suggestions for improving this document are encouraged. They should be sent to: Senior Technical Director, Operat

21、ions National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org At the time of approval, the Building Wire and Cable Section was composed of the following members:AFC Cable Systems, Inc., a part of Atkore InternationalNew Bedford, MA Alan Wir

22、e CompanySikeston, MO Alcan CableAtlanta, GA AmerCableEl Dorado, AR Anamet Electrical, Inc.Mattoon, IL Cerro Wire LLCHartselle, AL Colonial Wire cables used for feeders typically do. 1.2.2 Polarity In order to ensure proper polarity identification, UL 854 requires an insulated conductor intended to

23、serve as a grounded conductor to be white or gray throughout its entire length and circumferenceor (on other than green insulation) to have three equally spaced white stripes the entire length of the conductor. If there are multiple grounded conductors, only one may use white stripes. The additional

24、 grounded conductors may use a raised tracer, or one or more non-continuous or continuous straight or helical stripes, in a contrasting color other than green. Grounded conductors may also be bare. 1.3 MARKING 1.3.1 General Markings for size or other information, whether on the jacket or the insulat

25、ion, are indicated every 600 mm (24 in.) along the length. The size and identification of copper-clad aluminum must be marked every 150 mm (6 in.). 1.3.2 Cable, Tag, or Package Each cable will have the marking “SE,” “Type SE,” “USE,” “Type USE,” “USE-2,” or “Type USE-2” to indicate the proper NEC Ty

26、pe designation. Manufacturer and factory identifiers, where applicable, also will appear on the finish jacket. Some markings are not permitted. Type USE and USE-2 cables cannot be marked “UF,” for example. 1.3.3 Circuit Conductors Although Type SE, USE, and USE-2 cables use common insulating materia

27、ls, conductors for Type SE cable cannot have a “USE” marking, since Type SE is not for underground use. 1.3.4 Grounding Conductors The outer surface of an insulated grounding conductor is green along its entire length and circumference. One or more yellow stripes may also be present. 1.4 CODES AND S

28、TANDARDS 1.4.1 National Electrical Code (NEC) Service-entrance cable that is designed, manufactured, and tested for use in accordance with NEC Article 338, Service-Entrance Cable, is used primarily for services. It is constructed of either single conductor or multi-conductor assemblies and is provid

29、ed with or without an overall covering. Two types of service-entrance cable are recognized by the NEC: RV 4-2012 Page 3 2013 National Electrical Manufacturers Association a) Type SE, which has a flame-retardant, moisture-resistant covering, and b) Type USE, which is identified for underground use. T

30、his covering is also moisture-resistant but is not required to be flame-retardant. 1.4.1.1 Uses Permitted Service-entrance cables for use as service-entrance conductors are installed in accordance with NEC Article 230. They are permitted for use as service conductors to supply a building or other st

31、ructure but cannot pass through the interior of another structure. Service-entrance cable also can be used for feeders and branch circuits and, depending on intended use, must adhere to different sections of the code for installation. 1.4.1.2 Use in Service Raceways When service-entrance cable is in

32、stalled in raceways, other types of conductors are not allowed to be installed in the same service raceway, except for grounding conductors and bonding jumpers or load management control conductors with overcurrent protection. 1.4.1.3 Related NEC Articles The following NEC articles also contain prov

33、isions for the use of service-entrance cable: Chapter 2: Wiring and Protection ARTICLE 215Feeders 215.2 Minimum Rating and Size ARTICLE 220Branch-Circuit, Feeder, and Service Conductors 220.82 Dwelling Unit 220.84 Multifamily Dwelling 220.86 Schools ARTICLE 230Services 230.9 Clearance on Buildings 2

34、30.24 Clearances 230.40 Number of Service-Entrance Conductor Sets 230.41 Insulation for Service-Entrance Conductors 230.42 Minimum Sizing and Rating 230.43 Wiring methods for 600 volts, Nominal, or Less 230.44 Cable Trays 230.46 Spliced Conductors 230.50 Protection Against Physical Damage 230.53 Rac

35、eways to Drain 230.54 Overhead Service Locations 230.70 General 230.71 Maximum Number of Disconnects 230.82 Equipment Connected to the Supply Side of Service Disconnects 230.90 Overcurrent Protection Where Required 230.202 Service-Entrance Conductors ARTICLE 240Overcurrent Protection 240.21 Location

36、 in Circuit ARTICLE 250Grounding 250.24 Grounding Service-Supplied Alternating-Current Systems 250.28 Main Bonding Jumper and System Bonding Jumper 250.36 High-Impedance Grounded Neutral Systems 250.53 Grounding Electrode System Installation 250.66 Size of Alternating-Current Grounding Electrode Con

37、ductor WD 9-2013 Page 4 2013 National Electrical Manufacturers Association 250.102 Bonding Conductors and Jumpers 250.184 Solidly Grounded Neutral Systems Chapter 3: Wiring Methods and Materials ARTICLE 310Conductors for General Wiring 310.15 Ampacities for Conductors Rated 0-2000 Volts 310.104 Cond

38、uctor Constructions and Applications 310.106 Conductors 310.110 Conductor Identification 310.120 Marking ARTICLE 314Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures 314.16(C)(3) Short Radius Conduit Bodies ARTICLE 334Nonmetallic-Sheathed Cable: Types NM, NM

39、C, and NMS 334.12 Uses Not Permitted ARTICLE 338Service-Entrance Cable: Type SE and USE ARTICLE 392Cable Trays 392.10 Uses Permitted ARTICLE 396Messenger Supported Wiring 396.10 Uses Permitted Chapter 4: Equipment for General Use ARTICLE 430Motors, Motor Circuits and Controllers 430.95 Service Equip

40、ment 430.97 Busbars and Conductors Chapter 5: Special Occupancies ARTICLE 545Manufactured Buildings 545.5 Supply Conductors 545.6 Installation of Service Entrance Conductors ARTICLE 550Mobile Homes, Manufactured Homes, and Mobile Home Parks 550.1 Scope 550.11 Disconnecting Means and Branch-Circuit P

41、rotective Equipment 550.16 Grounding ARTICLE 551Recreational Vehicles and Recreational Vehicle Parks 551.73 Calculated Load Chapter 6: Special Equipment ARTICLE 695Fire Pumps 695.6 Power Wiring INFORMATIVE ANNEXES Informative Annex AProduct Safety Standards Informative Annex ETypes of Construction 1

42、.4.2 Underwriters Laboratories (UL) Standards and Directory UL publishes standards and directories that provide detailed information on the construction, performance, application, ratings, and installation aspects of service-entrance cable. RV 4-2012 Page 5 2013 National Electrical Manufacturers Ass

43、ociation 1.4.2.1 UL Standards UL 854 is the standard for construction and performance requirements of service-entrance cable. Thermoplastic-insulated conductors that serve as components of service-entrance cable must comply with UL 83, Thermoplastic-Insulated Wires and Cables. Thermoset-insulated co

44、nductors that serve as components of service-entrance cable must comply with UL 44, Thermoset-Insulated Wires and Cables. 1.4.2.2 Nationally Recognized Testing Laboratory Directories Nationally Recognized Testing Laboratories (such as UL, CSA, and Intertek) publish directories that contain useful in

45、formation on the products each organization lists, recognizes, and certifies. The directories are frequently used by installers and inspection authorities to better understand how to specify and install products in accordance with their listing and to demonstrate that a product is listed by a Nation

46、ally Recognized Testing Laboratory. These directories are helpful for understanding how products such as service-entrance cable are constructed and marked. They also provide information on special or optional ratings, as well as terminations. One UL directory, for example, addresses UL-approved meth

47、ods for maintaining the fire resistive rating on walls, floors, and ceilings for fire resistive ratedconstruction when cables must penetrate them and be fire-stopped. Internet Resources a) The UL website, , contains online versions of UL directories, as well as general information related to UL prod

48、ucts and services. Click on “Certifications” to search the product listings. b) CSA can be found online at www.csa.ca. Click on “Regulators” to search product listings and learn about the CSA Mark. c) Interteks website is Click on “Product Directories” to search the ETL directories. 1.4.2.3 UL Dire

49、ctories The following information is excerpted from the UL General Information for Electrical Equipment DirectoryWhite Book: GENERAL This category covers service-entrance cable designated Type SE and Type USE for use in accordance with Article 338 of ANSI/NFPA 70, National Electrical Code (NEC). Service-entrance cable, rated 600 V, is Listed in sizes 14 AWG and larger for copper, and 12 AWG and larger for aluminum or copper-clad aluminum. The cable is designated as follows: Type SEIndicates cable for abovegro