1、 Approved as an American National Standard ANSI Approval Date: February 23, 2009 ANSI/NEMA WC 70-2009 ICEA S-95-658-2009 Power Cables Rated 2000 Volts or Less for the Distribution of Electrical Energy Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rossl
2、yn, Virginia 22209 www.nema.org Copyright 2009 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Pro
3、tection of Literary and Artistic Works, and the International and Pan American Copyright Conventions.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 devel
4、oped. 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) and the Insulated Cable Engineers Association Inc. (ICEA) standards and guideline publications, o
5、f which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together persons who have an interest in the topic covered by this publication. While NEMA and ICEA administers the process and establishes rules to promote fa
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13、atement. ANSI/NEMA WC 70-2009/ICEA S-95-658-2009 Page i 2009 By the National Electrical Manufacturers Association And the Insulated Cable Engineers Association. CONTENTS Page FOREWORD.iv Section 1 GENERAL . 1 1.1 SCOPE. 1 1.2 GENERAL INFORMATION 1 1.3 INFORMATION TO BE SUPPLIED BY PURCHASER 1 1.3.1
14、Characteristics of System on Which Cable is to be Used . 1 1.3.2 Quantities and Description of Cable 2 Section 2 CONDUCTOR. 3 2.0 GENERAL 3 2.1 PHYSICAL AND ELECTRICAL PROPERTIES . 3 2.1.1 Copper Conductors . 3 2.1.2 Aluminum Conductors . 3 2.1.3 Flexible Conductors. 4 2.2 CONDUCTOR SIZE UNITS. 4 2.
15、3 CONDUCTOR DC RESISTANCE PER UNIT LENGTH 4 2.3.1 Direct Measurement of dc Resistance 4 2.3.2 Calculation of dc Resistance per Unit Length . 4 2.4 CONDUCTOR DIAMETER 5 Section 3 INSULATION. 17 3.1 MATERIAL . 17 3.2 INSULATION LEVELS. 17 3.3 INSULATION THICKNESSES . 17 3.3.1 The Thickness Of Insulati
16、on For Various Systems Shall Be Determined As Follows: 18 3.4 ADDITIONAL INSULATION THICKNESS FOR NON-SHEATHED SUBMARINE CABLES. 18 3.5 REPAIRS . 18 3.6 INSULATION GRADES AND REQUIREMENTS 18 3.6.1 The Classes Of Insulation And Their General Characteristics Are Given In Table 3-1. . 18 3.6.2 Voltage
17、Tests. 18 3.6.3 Insulation Resistance 18 Section 4 COVERINGS. 28 4.1 JACKETS . 28 4.1.1 Cross-linked and Thermoplastic Jackets - General. 28 4.1.2 Neoprene, Heavy-duty Black (CR-HD). 28 4.1.3 Neoprene, General Purpose (CR-GP) . 28 4.1.4 Polyvinyl Chloride (PVC) 28 4.1.5 Low and Linear Low Density Po
18、lyethylene (LDPE & LLDPE) 28 4.1.6 Medium Density Polyethylene (MDPE) 28 4.1.7 High Density Polyethylene (HDPE) 28 4.1.8 Nitrile-Butadiene/Polyvinyl-Chloride, Heavy Duty (NBR/PVC-HD) 28 4.1.9 Nitrile-butadiene/Polyvinyl-chloride, General-purpose Duty (NBR/PVC-GP). 29 4.1.10 Chlorosulfonated Polyethy
19、lene, Heavy Duty (CSPE-HD) 29 4.1.11 Chlorinated Polyethylene, Thermoplastic (CPE-TP) 29 4.1.12 Chlorinated Polyethylene, Cross-Linked, Heavy Duty (CPE-XL-HD). 29 4.1.13 Low Smoke Halogen Free Jackets 29 4.1.14 Thermoplastic Elastomer (TPE) 29 4.1.15 Optional Requirements 29 4.1.16 Separator Under J
20、acket. 29 4.1.17 Repairs 29 4.1.18 Jacket Thickness . 32 4.1.19 Irregularity Inspection of Jackets Over Cable 33 4.2 METALLIC AND ASSOCIATED COVERINGS 34 ANSI/NEMA WC 70-2009/ICEA S-95-658-2009 Page ii 2009 By the National Electrical Manufacturers Association And the Insulated Cable Engineers Associ
21、ation. 4.2.1 General 34 4.3 DIVISION I . 35 4.3.1 Smooth Metallic Sheaths.35 4.3.2 Flat Steel Tape Armor . 37 4.3.3 Interlocked Metal Tape Armor . 39 4.3.4 Continuously Corrugated Metal Armor 40 4.3.5 Galvanized Steel Wire Armor 41 4.3.6 Bedding Over Cable Cores To Be Metallic Armored. 44 4.3.7 Oute
22、r Servings. 45 4.3.8 Cross-linked Jackets Over Metallic Coverings (Sheaths and Armors) 45 4.3.8.1 Material 45 4.3.9 Thermoplastic Jackets Over Metallic Coverings (Sheaths or Armors) 46 4.4 DIVISION II 47 4.4.1 Borehole Cable (Suspended at One End Only) 47 4.4.2 Dredge Cable. 48 4.4.3 Shaft Cable 49
23、4.4.4 Vertical Riser Cable. 49 4.5 DIVISION III . 50 4.5.1 Buried Land Cables . 50 Section 5 ASSEMBLY, FILLERS, CONDUCTOR IDENTIFICATION, GROUNDING CONDUCTORS AND SHIELDING. 51 5.1 ASSEMBLY OF MULTIPLE-CONDUCTOR CABLES . 51 5.1.1 Multiple-Conductor Round Cables With An Overall Covering. 51 5.1.2 Mul
24、tiple-Conductor Assemblies Without Overall Covering 51 5.1.3 Flat Twin Cables 52 5.2 FILLERS. 52 5.3 CONDUCTOR IDENTIFICATION 52 5.4 GROUNDING CONDUCTORS 52 5.5 SHIELDING 52 5.5.1 General 52 5.5.2 Metal Tapes. 53 Section 6 PRODUCTION TESTS AND TEST METHODS . 54 6.1 GENERAL 54 6.1.1 Testing and Test
25、Frequency 54 6.1.2 Test Methods. 54 6.1.3 Number of Test Specimens from Samples 56 6.2 THICKNESS MEASUREMENTS . 56 6.2.1 Beddings and Servings 56 6.2.2 Other Components 56 6.3 SAMPLES AND SPECIMENS FOR PHYSICAL AND AGING TESTS 56 6.3.1 General 56 6.3.2 Sampling 56 6.3.3 Size of Test Specimens. 56 6.
26、3.4 Specimens with Jackets 57 6.3.5 Specimen Surface IrregularitiesError! Bookmark not defined. 57 6.3.6 Specimens for the Aging Tests 58 6.3.7 Calculation of Area of Test Specimens . 58 6.4 AGING TESTS . 59 6.4.1 Air Oven Aging Test 59 6.4.2 Oil Immersion Test 59 6.5 HEAT SHOCK TEST 59 6.6 COLD-BEN
27、D TEST 60 6.7 TIGHTNESS OF POLYETHYLENE JACKET TO SHEATH TEST 60 6.8 HOT CREEP TEST 60 ANSI/NEMA WC 70-2009/ICEA S-95-658-2009 Page iii 2009 By the National Electrical Manufacturers Association And the Insulated Cable Engineers Association. 6.9 WRAP TEST FOR NYLON-COVERED INSULATED CONDUCTORS. 60 6.
28、10 ELECTRICAL TESTS ON COMPLETED CABLES . 61 6.10.1 Voltage Tests. 61 6.10.2 Insulation Resistance 63 6.10.3 Shield Continuity 63 6.11 RETESTS. 63 6.11.1 Physical and Aging Properties and Thickness 63 6.11.2 Other Tests 64 Section 7 QUALIFICATION TESTS. 65 7.0 GENERAL 65 7.1 ACCELERATED WATER ABSORP
29、TION TEST, ELECTRICAL METHOD AT 60HZ. 65 7.2 Insulation Resistance Test. 65 7.3 TRAY CABLE FLAME TEST . 65 7.4 SUNLIGHT RESISTANCE TEST. 65 7.5 Halogen Content of Non-Metallic Elements. 65 7.6 Smoke generation test . 66 7.7 acid gas equivalent test 66 7.8 ENVIRONMENTAL STRESS CRACKING TEST 66 7.9 AB
30、SORPTION COEFFICIENT 66 7.10 WET INSULATION RESISTANCE STABILITY TEST . 66 Section 8 CONSTRUCTIONS OF SPECIFIC TYPES 67 8.1 PREASSEMBLED AERIAL CABLES. 67 8.1.1 Scope. 67 8.1.2 Conductors 67 8.1.3 Insulation . 67 8.1.4 Jacket 67 8.1.5 Assembly . 67 8.1.6 Messenger. 67 8.1.7 Design Criteria. 67 APPEN
31、DICES . 68 APPENDIX A NEMA, ICEA, AND ASTM STANDARDS (Normative). 68 APPENDIX B DEFINITIONS OF MAXIMUM TEMPERATURES OF INSULATED CABLE CONDUCTORS (Normative) 71 APPENDIX C EMERGENCY OVERLOADS (Informative) . 72 APPENDIX D ABBREVIATIONS AND SYMBOLS (Informative) 73 APPENDIX E REPRESENTATIVE TENSILE S
32、TRENGTH AND ELONGATION OF NONMAGNETIC METALS (Informative). 74 APPENDIX F RECOMMENDED BENDING RADII FOR CABLES (Informative) . 75 APPENDIX G ADDITIONAL CONDUCTOR INFORMATION. 77 (Informative) 77 APPENDIX H PROCEDURE FOR DETERMINING DIMENSIONAL REQUIREMENTS OF JACKETS AND ASSOCIATED COVERINGS (Normat
33、ive) 85 ANSI/NEMA WC 70-2009/ICEA S-95-658-2009 Page iv 2009 By the National Electrical Manufacturers Association And the Insulated Cable Engineers Association. FOREWORD This Standards Publication for Power Cables Rated 2000 Volts or Less for the Distribution of Electrical Energy was developed by th
34、e Insulated Cable Engineers Association (ICEA) and approved by the National Electrical Manufacturers Association (NEMA). ICEA/NEMA Standards are adopted in the public interest and are designed to eliminate misunderstanding between the manufacturer and the user and to assist the user in selecting and
35、 obtaining the proper product for his particular need. Existence of an ICEA/NEMA Standard does not in any respect preclude the manufacture or use of products not conforming to the standard. The user of this Standard is cautioned to observe any health or safety regulations and rules relative to the m
36、anufacture and use of cable made in conformity with this Standard. Requests for interpretation of this Standard must be submitted in writing to: Insulated Cable Engineers Association, Inc. Post Office Box 1568 Carrollton, Georgia 30112 An official written interpretation will be provided once approve
37、d by ICEA and NEMA. Suggestions for improvements gained in the use of this Standard will be welcomed by the Association. ANSI/NEMA WC 70-2009/ICEA S-95-658-2009 Page 1 2009 By the National Electrical Manufacturers Association And the Insulated Cable Engineers Association. Section 1 GENERAL 1.1 SCOPE
38、 This standard applies to materials, constructions, and testing of 2000 volts and less thermoplastic, crosslinked polyethylene, and crosslinked rubber insulated wires and cables which are used for the transmission and distribution of electrical energy for normal conditions of installation and servic
39、e, either indoors, outdoors, aerial, underground, or submarine. 1.2 GENERAL INFORMATION This standard covers requirements for conductors, insulations and protective coverings and general constructional and dimensional details common to most standard types of wires and cables. Constructions of specif
40、ic types are covered in Section 8 or in other ICEA standards. Where a conflict exists between the requirements of Section 8, or other ICEA documents, and those of Sections 1 to 7 inclusive, the requirements of specific types shall apply. See Appendix A for complete titles and dates of ICEA publicati
41、ons and ASTM Standards to which reference is made in this publication. See Section 6 for test procedures not elsewhere referenced. Recommended minimum bending radii are given in Appendix F. In classifying crosslinked insulations and jackets in these standards, the term “rubber“ when used alone witho
42、ut further description shall mean synthetic rubber. Insulation thicknesses are designated in terms of cable insulation levels (see 3.3). In classifying jackets and sheaths in these standards, the term “jacket“ refers to a continuous nonmetallic covering and “sheath“ to a continuous metallic covering
43、. U.S. customary units, except for temperature, are specified throughout this standard. Approximate International System of Units (SI) equivalents are included for information only. Requirements of a referenced ASTM standard shall be determined in accordance with the procedure or method designated i
44、n the referenced ASTM standard unless otherwise specified in this standard. 1.3 INFORMATION TO BE SUPPLIED BY PURCHASER When requesting design proposals from cable manufacturers, the prospective purchaser should furnish the following information: 1.3.1 Characteristics of System on Which Cable is to
45、be Used 1. Current - alternating or direct. 2. Frequency - Hertz. 3. Normal operating voltage between phases or, in direct current, between conductors. 4. Number of phases and conductors. 5. Cable insulation level (see 3.2). 6. Minimum temperature at which cable will be installed. ANSI/NEMA WC 70-20
46、09/ICEA S-95-658-2009 Page 2 2009 By the National Electrical Manufacturers Association And the Insulated Cable Engineers Association. 7. Description of installation. a. In buildings. b. In underground ducts. c. Aerial. (1) On messenger in metal rings. (2) Preassembled. (3) Field spun. d. Direct buri
47、al in ground. e. Submarine. f. Descriptions other than the foregoing. 8. Conditions of installation. a. Ambient temperature. b. Number of loaded cables in duct bank or conduit. For duct/conduit, give type of conduit (magnetic/nonmagnetic), size, number of loaded conduits, ducts enclosed or exposed,
48、and spacing between duct/conduits. c. Load factor. d. Method of bonding and grounding of sheaths. e. Wet or dry location. 9. Other special conditions. 1.3.2 Quantities and Description of Cable 1. Total number of feet, including test lengths, and shipping reel lengths if specific lengths are required
49、. 2. Type of cable. Describe as single conductor, two-conductor, three-conductor, etc. 3. Rated circuit voltage, phase to phase. 4. Type of conductor - copper or aluminum. 5. Size of conductor If conditions require other than standard stranding, a complete description should be given. 6. Type of insulation. 7. Thickness of insulation. 8. Type of outer covering. 9. Maximum allowable overall diameter. When duct space is not limited, it is desirable not to restrict the overall diameter. 10. Method of conductor identification. 11. Special markings. ANSI/NEMA WC 70-2009/ICEA S
