NEMA TC 7-2013 Smooth-Wall Coilable Electrical Polyethylene Conduit.pdf

1、 NEMA TC 7-2013 Smooth-Wall Coilable Electrical Polyethylene Conduit NEMA Standards Publication TC 7-2013 Smooth-Wall Coilable Electrical Polyethylene Conduit Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org Copyright

2、2013 by the 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. C

3、opyright 2013 by the National Electrical Manufacturers Association. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessar

4、ily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus s

5、tandards 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 administers the process and establishes rules to promote fairness in the development of consensus, it does not write t

6、he 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 guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature what

7、soever, 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 completeness of any information pub

8、lished 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 the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In

9、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 should rely on his or her own

10、 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 other standards on the topic covered by this publication may be available from other sources, which the user may wish to co

11、nsult 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 health purposes. Any certi

12、fication or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. TC 7-2013 Page i Copyright 2013 by the National Electrical Manufacturers Association.

13、 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 GENERAL REQUIREMENTS 4 3.1 Materials 4 3.1.1 Electrical Conduit . 4 3.2 Dimensions and Lengths . 4 3.2.1 Average Out

14、side Diameter . 4 3.2.2 Wall Thickness . 4 3.2.3 Ovality . 4 3.2.4 Length . 4 3.3 Workmanship . 4 3.3.1 Bonding to Conduit . 4 3.3.2 Excess Pull Member . 5 3.4 Inspections. 5 3.5 Internal Ribs. 5 SECTION 4 PERFORMANCE REQUIREMENTS 7 4.1 Quality Control Tests . 7 4.1.1 Conditioning 7 4.1.2 Dimensions

15、 . 7 4.1.3 Ovality . 7 4.1.4 Compression and Recovery . 7 SECTION 5 TEST METHODS 9 5.1 Conditioning, Test Conditions, and Sampling . 9 5.1.1 Conditioning Test Specimens. 9 5.1.2 Sampling . 9 5.2 Dimensions 9 5.2.1 Outside Diameter (Average). 9 5.2.2 Wall Thickness . 9 5.2.3 Ovality . 9 5.3 Compressi

16、on and Recovery 9 SECTION 6 MARKINGS . 11 6.1 Marking Requirements 11 6.2 Optional Markings 11 ANNEX A RECOMMENDED MINIMUM DRUM DIAMETERS 13 TC 7-2013 Page ii Copyright 2013 by the National Electrical Manufacturers Association. TABLES Table 3-1 D 3350 Cell Classification Material Requirement for HDP

17、E Conduit, per ASTM F 2160 . 5 Table 3-2 Sizes and Dimensions of HDPE Conduit 6 Table 4-1 Load for Compression and Recovery Test . 7 TC 7-2013 Page iii Copyright 2013 by the National Electrical Manufacturers Association. FOREWORD The purpose of this Standards Publication for high-density polyethylen

18、e (HDPE) conduit (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 particula

19、r need. In addition, 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 member

20、s, works closely 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. Proposed or

21、 recommended revisions to this Standards Publication should be addressed to: Vice President, Technical Services National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 Publication No. TC 7-2013 revises and supersedes Publication No. TC 7-2005, the NEM

22、A Standards Publication for Smooth Wall Coilable Electrical Polyethylene Conduit. The Polymer Raceway Products Section developed this Standards Publication. Section approval of the standard does not necessarily imply that section members voted for its approval or participated in its development. At

23、the time it was published, the Section was composed of the following members: AFC Cable Systems, a part of Atkore INew Bedford, MA Allied Tube and Conduit, a part of Atkore IHarvey, IL Anamet Electrical, Inc.http:/Mattoon, IL Champion Fiberglass, ISpring, TX FRE Composites (2005) ISt. Andre-dArgente

24、uil, PQ, Canada Heritage Plastics, ICarrollton, OH Hubbell IShelton, CT IPEX USA, LLCMississauga, ON, Canada Legrand North Americawww.legrand.usWest Hartford, CT Panduit CTinley Park, IL Royal Pipe SShelby Township, MI Southern Pipe, Inc.www.southern-New London, NC Thomas by the use of a minimum of

25、3 color stripes approximately 120 degrees apart, color shell or full color wall. Note: Yellow color shall be reserved for use in identifying gas distribution or transmission pipe. 3.3 WORKMANSHIP Polyethylene conduit shall be homogeneous throughout and free from visible cracks, holes, foreign inclus

26、ions or other defects, which could cause damage or compromise the physical strength of the conduit. It shall be as uniform as practicable in color, opacity, density, and other physical properties. 3.3.1 Bonding to Conduit If pull media or cable is installed at the factory, there shall be no bonding

27、of the installed material to the inner conduit wall. This shall be verified during the production of the conduit by free movement of the pull media or cable inside the conduit. TC 7-2013 Page 5 Copyright 2013 by the National Electrical Manufacturers Association. 3.3.2 Excess Pull Member If pull medi

28、a is installed at the factory, its length shall be equal to or greater than the conduit length. In addition, the pull media and inside of the conduit may be coated with a lubricant that prevents abrasion of conduit bends during cable pulling and lowers pull tensions on the cable. 3.3.3 Friction Redu

29、ction Lubricants applied to the conduit ID and/or cable for CIC shall be compatible with cable jacket and insulation materials and shall be tested in accordance with IEEE-1210 to show that the dielectric strength and physical properties are not adversely affected. If co-extruded lubricated surfaces

30、are used as a component of the inner wall, they shall be permanently bonded so as not to delaminate under frictional loading. 3.4 INSPECTIONS The manufacturer shall inspect the conduit at time of manufacture for compliance with dimensional requirements, performance requirements, and freedom from def

31、ects as defined in Section 4. 3.5 INTERNAL RIBS Optional internal ribbed profiles meant for reducing friction shall be agreed upon between the manufacturer and customer. The internal rib shall be of a longitudinal design and shall prevent the introduction of a continuous twist force in one direction

32、 with a rib height that does not exceed 0.030” and shall be in addition to the major wall thickness. Internal ribs shall not be factored into determining cable fill factors or ID reductions. This conduit shall comply with all other requirements of this standard. Table 3-1 D 3350 Cell Classification

33、Material Requirement for HDPE Conduit, as per ASTM F 2160 Properties ASTM Test Method Minimum Acceptable Cell Minimum Values Density D 1505, D 792, or D 4883 3 0.941 g/cm3 Melt index (190/2.16) D 1238 3 or 4, or 2 in accordance with Note 1 96 h is allowable provided that all other material requireme

34、nts in Table 3.1 are met. NOTE 3PE materials for colored conduit black with 2% minimum carbon black, color with UV stabilizer. Copyright 2013 by the National Electrical Manufacturers Association. Table 3-2 SIZES AND DIMENSIONS OF HDPE CONDUIT U.S. CUSTOMARY UNITS Trade Size Metric Trade Size Average

35、 Outside Diameter (inches) Wall Thickness (inches) EPEC-17 EPEC-13.5 EPEC-40 EPEC-80 EPEC-11 MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 1/2 13 0.840 0.004 0.060 0.080 0.062 0.082 0.109 0.129 0.147 0.167 0.076 0.096 3/4 19 1.050 0.005 0.062 0.082 0.078 0.098 0.113 0.133 0.154 0.174 0.095 0.115 1 25 1.31

36、5 0.007 0.077 0.097 0.097 0.117 0.133 0.153 0.179 0.200 0.120 0.124 1 1/4 32 1.660 0.008 0.098 0.118 0.123 0.143 0.140 0.160 0.191 0.214 0.151 0.171 1 1/2 38 1.900 0.010 0.112 0.132 0.141 0.161 0.145 0.165 0.200 0.224 0.173 0.194 2 51 2.375 0.012 0.140 0.160 0.176 0.197 0.154 0.174 0.218 0.244 0.216

37、 0.242 2 1/2 64 2.875 0.014 0.169 0.189 0.213 0.239 0.203 0.227 0.276 0.309 0.261 0.292 3 76 3.500 0.018 0.206 0.231 0.259 0.290 0.216 0.242 0.300 0.336 0.318 0.356 4 102 4.500 0.023 N/A N/A 0.333 0.373 0.237(1) 0.265 0.337 0.377 0.409 0.458 5 127 5.563 0.028 N/A N/A 0.412 0.461 0.258(1) 0.289 0.375

38、 0.420 0.506 0.567 6 152 6.625 0.033 N/A N/A 0.491 0.550 0.280(1) 0.314 0.432(1) 0.484 0.602 0.674 8 203 8.625 0.043 N/A N/A 0.639(1) 0.716 0.322(1) 0.361 N/A N/A 0.784(1) 0.878 METRIC UNITS Trade Size Metric Trade Size AVERAGE OUTSIDE DIAMETER (mm) Wall Thickness (mm) EPEC-17 EPEC-13.5 EPEC-40 EPEC

39、-80 EPEC-11 MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 1/2 13 21.34 0.11 1.52 2.03 1.57 2.08 2.77 3.28 3.73 4.24 1.93 2.44 3/4 19 26.67 0.13 1.57 2.08 1.98 2.49 2.87 3.38 3.91 4.42 2.41 2.92 1 25 33.40 0.17 1.96 2.416 2.46 2.97 3.38 3.89 4.55 5.08 3.05 3.56 1 1/4 32 42.16 0.21 2.49 3.00 3.12 3.63 3.56

40、4.07 4.85 5.43 3.84 4.35 1 1/2 38 48.26 0.24 2.84 3.35 3.58 4.09 3.68 4.19 5.08 5.69 4.39 4.92 2 51 60.33 0.30 3.56 4.06 4.47 5.00 3.91 4.42 5.54 6.10 5.49 6.15 2 1/2 64 73.03 0.37 4.29 4.80 5.41 6.07 5.16 5.77 7.01 7.85 6.64 6.95 3 76 88.90 0.44 5.23 5.87 6.58 7.37 5.49 6.15 7.62 8.53 8.08 9.05 4 1

41、02 114.30 0.57 N/A N/A 8.46 9.48 6.021) 6.73 8.56 9.58 10.39 11.63 5 127 141.30 0.71 N/A N/A 10.47 11.73 6.551) 7.34 9.53 10.67 12.85 14.39 6 152 168.28 0.84 N/A N/A 12.47 13.97 7.111) 7.97 10.97 12.29 15.29 17.12 8 203 219.08 1.10 N/A N/A 16.23 18.19 8.18 9.17 N/A N/A 19.91 22.30 (1) Diameter and w

42、all types that are available in stick lengths only as either the diameter or wall thickness are not conducive to coiling. TC 7-2013 Page 7 Copyright 2013 by the National Electrical Manufacturers Association. Section 4 PERFORMANCE REQUIREMENTS 4.1 QUALITY CONTROL TESTS 4.1.1 Conditioning At the time

43、of production, measurements and performance tests can be made at the temperature within the factory. In case of disagreement, specimens shall be conditioned per 5.1.1. 4.1.2 Dimensions The conduit dimensions shall meet the requirements listed in Table 3-2 when measured in accordance with the methods

44、 listed in 5.2. 4.1.3 Ovality The ovality (cross section) of trade size 2 in. (53 mm) and smaller conduit shall not exceed 7% when measured in accordance with section 5.7. Coiled conduit larger than trade size 2 in. (53 mm) through 3 in. (78 mm) shall not exceed 10% when measured in accordance with

45、section 5.2.3. Kinks in a coil shall not be acceptable. See Appendix A for reel tables and an additional explanation of ovality for reeled or coiled conduit. Ovality for straight lengths of conduit shall not exceed 5%. 4.1.4 Pipe Stiffness and Compression and Recovery Specimens of HDPE conduit shall

46、 achieve the minimum loads given in Table 4-1 at 5% deflection when tested in accordance with 5.3. In addition, during compression and recovery testing specimens shall not split or crack, when tested in accordance with 5.4. Table 4-1(a) MINIMUM LOAD FOR PIPE STIFFNESS TEST (US CUSTOMARY UNITS) MINIM

47、UM PIPE STIFFNESS(1) AND TEST VALUES(2) Trade Size (in) EPEC-17 EPEC-13.5 EPEC-40 EPEC-80 EPEC-11 PS Test Values PS Test Values PS Test Values PS Test Values PS Test Values Lbs/in/in lbsF Lbs/in/in lbsF Lbs/in/in lbsF Lbs/in/in lbsF Lbs/in/in lbsF 1/2 160 35 180 39 1190 222 3420 560 360 74 3/4 90 25

48、 180 48 630 156 1820 405 360 93 1 90 31 180 60 510 160 1400 402 360 116 1 1/4 90 40 180 76 280 116 790 303 360 147 1 1/2 90 45 180 87 200 97 580 261 360 168 2 90 57 180 109 120 74 370 215 360 210 2 1/2 90 68 180 132 160 119 430 300 360 254 3 90 83 180 161 100 92 300 261 360 309 4 N/A N/A 180 207 60 72 190 218 360 398 5 N/A N/A 180 256 40 61 140 202 360 492 6 N/A N/A 180 305 30 55 120 207 360 585 8 N/A N/A 180 397 20 48 NA NA 360 762 TC 7-2013 Page 8 Copyright 2013 by the National Electrical Manufacturers Association. (1) The minimum va