1、NEMA Standards Publication National Electrical Manufacturers Association NEMA TC 7-2016 Smooth-Wall Coilable Electrical Polyethylene ConduitNEMA TC 7-2016 Page i 2016 National Electrical Manufacturers Association NEMA Standards Publication TC 7-2016 Smooth-Wall Coilable Electrical Polyethylene Condu
2、it Published by National Electrical Manufacturers Association 1300 North 17 thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2016 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Bern
3、e Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. NEMA TC 7-2016 Page ii 2016 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the co
4、nsensus of persons 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
5、) standards and 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 publicatio
6、n. While NEMA 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 s
7、tandards and guideline 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 docum
8、ent. 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 of your particular purposes or needs. NEMA does not undertake
9、to guarantee 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 un
10、dertaking 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 circumstances. Informa
11、tion 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 compliance with the contents of
12、 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 safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibili
13、ty of the certifier or maker of the statement. NEMA TC 7-2016 Page i 2016 National Electrical Manufacturers Association CONTENTS Foreword . iii Section 1 General . 1 1.1 Scope . 1 1.2 Referenced Standards . 1 Section 2 Definitions and Abbreviations 3 2.1 Definitions 3 2.2 Abbreviations . 3 Section 3
14、 General Requirements 4 3.1 Materials 4 3.1.1 Electrical Conduit . 4 3.1.2 UV Stabilization for Buried Conduit, Outdoor Storage Stability . 4 3.2 Dimensions and Lengths . 4 3.2.1 Average outside Diameter . 4 3.2.2 Wall Thickness . 4 3.2.3 Ovality 4 3.2.4 Reel, Coil, and Stick Lengths . 4 3.3 Workman
15、ship . 5 3.3.1 Bonding to Conduit 5 3.3.2 Excess Pull Member 5 3.3.3 Friction Reduction 5 3.4 Inspections . 5 3.5 Internal Ribs. 5 Section 4 Performance Requirements 8 4.1 Quality Control Tests . 8 4.1.1 Conditioning . 8 4.1.2 Dimensions 8 4.1.3 Ovality 8 4.1.4 Pipe Stiffness and Compression and Rec
16、overy 8 Section 5 Test Methods 10 5.1 Conditioning, Test Conditions, and Sampling . 10 5.1.1 Conditioning Test Specimens 10 5.1.2 Sampling 10 5.2 Dimensions 10 5.2.1 Outside Diameter (Average) 10 5.2.2 Wall Thickness . 10 5.2.3 Ovality 10 5.3 Pipe Stiffness . 10 5.4 Compression and Recovery 10 Secti
17、on 6 Markings . 12 6.1 Marking Requirements 12 6.2 Optional Markings 12 Annex A Recommended Minimum Drum Diameters . 13 NEMA TC 7-2016 Page ii 2016 National Electrical Manufacturers Association Tables Table 1 D3350 Cell Classification Material Requirement for HDPE Conduit per ASTM F2160 . 6 Table 2
18、Sizes and Dimensions of HDPE Conduit . 7 Table 3 Minimum Load for Pipe Stiffness Test, Minimum Pipe Stiffness and Test Values 9 NEMA TC 7-2016 Page iii 2016 National Electrical Manufacturers Association Foreword The purpose of this standards publication for high-density polyethylene (HDPE) conduit (
19、duct) intended for underground use in the installation and protection of electrical cables is: 1. To list dimensions and other significant requirements; 2. To state the required properties of these products and to assist in selecting and obtaining the proper product for a particular need. In additio
20、n, this standard addresses the factory installation of electrical cable, or pull media commonly used to assist in the installation of cables. User needs have been considered throughout the development of this standard. The Polymer Raceway Products Section of NEMA, through its members, works closely
21、with such organizations as ASTM International, appropriate government agencies, testing laboratories, and others in the periodic review and revision of this standard. The Plastics Pipe Institute, in particular, was helpful in proposing revisions for this edition of TC 7. In the preparation of this S
22、tandards Publication, input of users and other interested parties has been sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be submitted to the concerned NEMA product Subdivision by contacting: Senior Technical Director, Operations National Electrical Manufactu
23、rers Association 1300 North 17 thStreet, Suite 900 Rosslyn, Virginia 22209 This standards publication was approved by the Polymer Raceway Section. At the time of publication, the section had the following members: Anamet Electrical, Inc., http:/Mattoon, IL AFC Cable Systems, a part of Atkore Interna
24、tional, New Bedford, MA Allied Tube and Conduit, a part of Atkore International, Harvey, IL Champion Fiberglass, Inc., Spring, TX FRE Composites, Inc., St. Andre-dArgenteuil, PQ, Canada Hubbell Incorporated, Shelton, CT IPEX Group, Mississauga, ON, Canada Legrand North America, www.legrand.usWest Ha
25、rtford, CT Panduit Corporation, Tinley Park, IL Royal Building Products, Shelby Township, MI Southern Pipe, Inc., www.southern-New London, NC Southwire Company, Carrollton, GA Thomas & Betts, a member of the ABB Group, Memphis, TN Underground Devices, Inc., Northbrook, IL United Fiberglass of Americ
26、a, Springfield, OH The following members participated in a special working to contribute to the development of this standard: Randy Kummer, Southwire Company Andrew Nause, IPEX Group Lance MacNevin, Plastics Pipe Institute NEMA TC 7-2016 Page iv 2016 National Electrical Manufacturers Association NEM
27、A TC 7-2016 Page 1 2016 National Electrical Manufacturers Association Section 1 General 1.1 Scope This standard covers several wall types of high-density polyethylene (HDPE) conduit for use in providing a protective raceway for electrical cables or communication cables buried underground or concrete
28、 encased. Note: Typical applications for HDPE conduit include power distribution, site lighting, signal and control and Supervisory Control and Data Acquisition (SCADA). Wall types include the following: EPEC-40 HDPE. This type represents the nominal dimensions for Schedule 40 conduit consistent wit
29、h ASTM F2160, ASTM D3485 and UL 651B or UL 1990 for Cable-in-Conduit (CIC). EPEC-80 HDPE. This type represents the nominal dimensions for Schedule 80 conduit consistent with ASTM F2160, ASTM D3485 and UL 651B or UL 1990 for CIC. EPEC-11 HDPE. This type represents the nominal dimensions for SDR 11 co
30、nduit consistent with ASTM F2160, ASTM D3485 and is not currently covered by UL. EPEC-13.5 HDPE. This type represents the nominal dimensions for DR 13.5 conduit consistent with ASTM F2160, ASTM D3485 and UL 651A or UL 1990 for CIC. EPEC-15.5 HDPE. This type represents the nominal dimensions for DR 1
31、5.5 conduit consistent with ASTM F2160, ASTM D3485 and UL 651A or UL 1990 for CIC. EPEC-17 HDPE This type represents the nominal dimensions for DR 17 conduit consistent with ASTM D3035, and UL 651A or UL1990 for CIC. Note: The values stated in U.S. customary units are to be regarded as the standard.
32、 1.2 Referenced Standards In this publication, reference is made to the standards listed below. Where all or part of an ASTM International, NFPA, or UL etc., standard specification is incorporated by reference in these specifications, the reference standard shall be the latest edition and revision.
33、Copies are available from the indicated sources. ASTM International 100 Barr Harbor Drive West Conshohocken, PA 19428-2959 D618 Standard Practice for Conditioning Plastics for Testing D638 Standard Test Method for Tensile Properties of Plastics D790 Standard Test Methods for Flexural Properties of U
34、nreinforced and Reinforced Plastics and Electrical Insulating Materials NEMA TC 7-2016 Page 2 2016 National Electrical Manufacturers Association D792 Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement D1238 Standard Test Method for Flow Rates of The
35、rmoplastics by Extrusion Plastometer D1505 Standard Test Method for Density of Plastics by the Density-Gradient Technique D1600 Standard Terminology for Abbreviated Terms Relating to Plastics D1693 Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics D2122 Standard Test Method
36、 for Determining Dimensions of Thermoplastic Pipe and Fittings D3350 Standard Specification for Polyethylene Plastics Pipe and Fittings Materials D3485 Standard Specification for Smooth-Wall Coilable Polyethylene (PE) Conduit (Duct) for Preassembled Wire and Cable D4883 Standard Test Method for Dens
37、ity of Polyethylene by the Ultrasound Technique F412 Standard Terminology Relating to Plastic Piping Systems F2160 Standard Specification for Polyethylene (HDPE) Conduit Based on Controlled Outside Diameter (OD) National Fire Protection Association Batterymarch Park Quincy, MA 02669 NFPA 70 National
38、 Electrical Code Underwriters Laboratories Inc. 333 Pfingsten Road Northbrook, IL 60062 UL 651A Schedule 40 and 80 High Density Polyethylene (HDPE) Conduit UL 1990 Nonmetallic Underground Conduit with Conductors NEMA TC 7-2016 Page 3 2016 National Electrical Manufacturers Association Section 2 Defin
39、itions and Abbreviations 2.1 Definitions Definitions of terms used in this standard shall be in accordance with ASTM F412. Abbreviations shall be in accordance with ASTM D1600 unless otherwise specified. quality control test: An in-plant test that is conducted on a given test frequency to determine
40、whether a product is in accordance with the specification requirements. ovality: A conduits deviation from roundness typically as a consequence of coiling, handling, or installation. qualification test: A non-repetitive evaluation conducted on an existing, altered, or new product to determine accept
41、ability. rework plastic (thermoplastic): A plastic from a manufacturers own production that has been reground or pelletized for reuse by the same manufacturer. reprocessed plastic: A thermoplastic prepared from usually melt processed scrap or reject parts by a plastics processor, or from non-standar
42、d virgin material or non-uniform virgin material. 2.2 Abbreviations EPEC: Electrical Polyethylene Conduit HDPE: High-density polyethylene SDR: Standard Dimension Ratio CIC: Cable in Conduit SCADA: Supervisory Control and Data Acquisition NEMA TC 7-2016 Page 4 2016 National Electrical Manufacturers A
43、ssociation Section 3 General Requirements 3.1 Materials 3.1.1 Electrical Conduit Electrical Polyethylene Conduit (EPEC) shall be made from non-pressure rated (NPR) high-density polyethylene classified in accordance with ASTM D 3350 and Table 1. Reworked clean polyethylene compound from the manufactu
44、rers own production, and approved reprocessed material, may be re-extruded into conduit, either alone or blended with virgin compound. Conduit containing rework and/or reprocessed materials shall meet all the material and product requirements of this standard. 3.1.2 UV Stabilization for Buried Condu
45、it, Outdoor Storage Stability Conduit for direct burial installations shall be UV stabilized with a sufficient amount of UV stabilizer to protect the conduit from UV degradation and color stability for a minimum of one (1) year of outside storage. Note: Acceptable cell for Color and UV resistance pr
46、operties in Table 1 may be achieved by utilizing a pre-compounded material or by blending a base natural material with black or color concentrates. Permanent color identification shall be permitted to be as solid color, as co-extruded stripes, as co- extruded skin or a combination of these. Co-extru
47、ded color identification shall be stabilized for UV and color stability for one (1) year of outside storage, for conduit that is to be direct buried. For color stripes a minimum of 3 color stripes shall be spaced equally, approximately at intervals of 120 degrees around the circumference of the cond
48、uit. Solid yellow or black with yellow stripes shall not be used for identification of conduit due to risk of misidentification with gas pipe. 3.2 Dimensions and Lengths Polyethylene conduit shall meet the dimensions shown in Table 2. 3.2.1 Average outside Diameter The average outside diameter of th
49、e conduit shall be as shown in Table 2 and shall be measured in accordance with 5.2.1 of this standard. 3.2.2 Wall Thickness The minimum and maximum wall thickness shall be as shown in Table 2 and shall be measured in accordance with 5.2.2 of this standard. 3.2.3 Ovality The maximum allowable ovality
