1、 Approved as an American National Standard ANSI Approval Date:6/27/2008 Insulated Cable Engineers Assoc., Inc. Publication No. T-27-581-2008 NEMA Standards Publication No. WC 53-2008 Standard Test Methods for Extruded Dielectric Power, Control, Instrumentation, and Portable Cables for Test Published
2、 by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 www.nema.org Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated (ICEA). All rights including translation into oth
3、er 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. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the cons
4、ensus 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、and the Insulated Cable Engineers Association (ICEA) 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 persons who have an interest in the topic covered by this
6、publication. While NEMA and ICEA administers the process and establishes rules to promote fairness in the development of consensus, they do not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgements contained in its standards and gu
7、ideline publications. NEMA and ICEA disclaims liability for 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
8、and ICEA disclaims 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 and ICEA do not un
9、dertake 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 and ICEA are not undertaking to render professional or other services for or on behalf of any person or enti
10、ty, nor is NEMA and ICEA 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 judgement or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any
11、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 consult for additional views or information not covered by this publication. NEMA and ICEA have no power, nor do they undertake to police or e
12、nforce compliance with the contents of this document. NEMA and ICEA do 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 attri
13、butable to NEMA and ICEA and is solely the responsibility of the certifier or maker of the statement. ICEA T-27-581/NEMA WC 53-2008 Page i Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated. CONTENTS Page Foreword iv Sectio
14、n 1 GENERAL 1 1.1 SCOPE. 1 1.2 REFERENCES. 1 1.2.1Normative References . 1 Section 2 ELECTRICAL METHODS 4 2.1 CONDUCTOR DC RESISTANCE 4 2.1.1Method When Sample Nominal Resistance is 1 Ohm or More . 4 2.1.2Method When Sample Nominal Resistance is Less Than 1 Ohm . 4 2.1.3Precautions for Short Sample
15、Method . 4 2.1.4Converting Measured Conductor Resistance to Resistance at 25C. 5 2.2 VOLTAGE TESTS ON COMPLETED CABLES. 5 2.2.1General. 5 2.2.1.1.1 Single Conductor Cable and Assemblies without an Overall Jacket 6 2.2.1.1.2 Multiple-conductor Cable with an Overall Jacket . 6 2.2.2ac Voltage Test 6 2
16、.2.3dc Voltage Test 6 2.2.4Spark Testing . 6 2.3 INSULATION RESISTANCE 8 2.3.1Single Conductor Cables 8 2.3.2Multiple Conductor Cables . 8 2.3.3Method to Determine the 1F Coefficient Factor for an Insulation . 8 2.3.4Converting Insulation Resistance to Insulation Resistance Constant 9 2.4 DISSIPATIO
17、N FACTOR (DF), CAPACITANCE (C), AND DIELECTRIC CONSTANT 11 2.5 SUITABILITY OF INSULATION COMPOUNDS FOR USE ON DC CIRCUITS IN WET LOCATIONS 11 2.6 ACCELERATED WATER ABSORPTION TEST, ELECTRICAL METHOD AT 60 Hz (EM-60) 12 2.7 DIELECTRIC CONSTANT AND VOLTAGE WITHSTAND FOR NONCONDUCTING STRESS CONTROL LA
18、YERS. 12 2.8 SPECIFIC SURFACE RESISTIVITY 13 2.9 U-BEND DISCHARGE RESISTANCE . 13 2.10 TRACK RESISTANCE . 13 2.11 VOLUME RESISTIVITY . 14 2.11.1Conductor Stress Control. 14 2.11.2Insulation Shield . 14 2.11.3Four-electrode Method. 15 2.12 SEMICONDUCTING JACKET RADIAL RESISTIVITY TEST 15 2.12.1Sample
19、 Preparation 15 2.12.2Test Equipment Setup 17 2.12.3Calculation 17 2.13 Dry Electrical Test for Class III Insulations (Shielded Medium Voltage Only) 18 2.13.1Test Samples . 18 2.13.2Test Procedure. 18 2.13.3Electrical Measurements 18 2.14 Discharge Resistance Test for discharge resistant Insulation
20、. 18 2.14.1Test Specimens . 18 2.14.2Test Environment . 18 2.14.3Test Electrodes 19 2.15 Wet Insulation Resistance Stability (600 2000 Volts) 19 Section 3 DIMENSIONAL METHODS 21 3.1 CONDUCTOR CROSS-SECTIONAL AREA BY DIAMETER MEASUREMENTS. 21 3.2 THICKNESS OF COMPONENTS OVER A CONDUCTOR. 21 ICEA T-27
21、-581/NEMA WC 53-2008 Page ii Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated. 3.2.1Optical Measuring Device Method for Any Component . 21 3.2.2Micrometer Method for Unbonded Components 21 3.2.3Extruded Insulation or Insu
22、lation Shield or Jacket . 21 3.2.4Tape . 21 3.2.5Sheath 22 3.2.6Bedding and Servings 22 3.3 DIAMETER OVER CABLE COMPONENTS 22 3.3.1Micrometer Method for Conductors 22 3.3.2Method for Any Component Except Conductors 22 3.3.3Tape Method for Any Component Having a Diameter 0.750 inch (19.1 mm) or Great
23、er. 22 3.4 Protrusion and Convolution Measurement. 22 Section 4 PHYSICAL METHODS 24 4.1 ADHESION (STRIPPING FORCE) 24 4.2 COLD BEND 24 4.3 HEAT DEFORMATION (DISTORTION) 24 4.3.1Insulation Deformation . 24 4.3.2Deformation of Jackets, Insulating and Conducting. 26 4.4 FLEXIBILITY TEST FOR INTERLOCKED
24、 ARMOR 26 4.5 TEAR RESISTANCE 26 4.6 GRAVIMETRIC WATER ABSORPTION . 27 4.7 DIRECTION AND LENGTH OF LAY 28 4.8 JACKET IRREGULARITY INSPECTION. 28 4.9 HOT CREEP TEST 29 4.10 VERTICAL TRAY FLAME TEST 29 4.10.170,000 BTU 29 4.10.2210,000 BTU 29 4.11 PHYSICAL AND AGING TESTS FOR INSULATION, JACKETS, AND
25、NONMETALLIC CONDUCTING MATERIALS . 29 4.11.1Sampling 29 4.11.2Number of Test Specimens . 30 4.11.3Size and Preparation of Specimens. 30 4.11.4Calculation for Area of Test Specimens. 30 4.11.5Physical Test Procedures. 31 4.11.6Retests . 31 4.11.7Tensile Strength Test . 31 4.11.8Tensile Stress Test 32
26、 4.11.9Elongation Test 32 4.11.10Set Test 32 4.11.11Aging Tests 32 4.11.12Physical Tests for Nonmetallic Conducting Materials Intended for Extrusion 33 4.12 ABSORPTION COEFFICIENT. 33 4.13 HEAT SHOCK 33 4.14 ENVIRONMENTAL CRACKING 34 4.14.1Test Specimens . 34 4.14.2Test Procedures. 34 4.15 METHOD FO
27、R FLEXIBILITY TEST FOR CONTINUOUS CORRUGATED ARMOR 34 4.16 SHRINKBACK TEST 34 4.16.1Sample Preparation 34 4.16.2Test Procedure. 34 4.17 WAFER BOIL TEST FOR CONDUCTOR AND INSULATION SHIELDS 34 4.18 EXTRUDED INSULATION SHIELD REMOVEABILITY (FIELD STRIPPABILITY) TEST . 35 4.19 TIGHTNESS OF POLYETHYLENE
28、 JACKET TO SHEATH TEST 35 ICEA T-27-581/NEMA WC 53-2008 Page iii Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated. LIST OF TABLES Table 2-1 FACTORS FOR CONVERTING MEASURED DC RESISTANCE OF CONDUCTORS TO 25C 5 Table 2-2 TE
29、MPERATURE CORRECTION FACTORS (TCF) FOR CONVERTING INSULATION RESISTANCE TO 15.6C .10 Table 2-3 INSULATION RESISTANCE STABILIZATION PERIOD 19 Table 4-1 LOAD VS. CONDUCTOR SIZE IN HEAT DEFORMATION TEST.25 Table 4-2 JACKET IRREGULARITY INSPECTION29 Table 4-3 MANDREL SIZE FOR HEAT SHOCK TEST33 ICEA T-27
30、-581/NEMA WC 53-2008 Page iv Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated. Foreword This Standard Test Methods Publication for Extruded Dielectric Power, Control, Instrumentation and Portable Cables was developed by t
31、he Insulated Cable Engineers Association, Inc. (ICEA) and was approved by the National Electrical Manufactures Association (NEMA). ICEA/NEMA Standards are adopted in the public interest and are designed to eliminate misunderstandings between the manufacturers and the user and to assist the user in s
32、electing and obtaining the proper product for his or her particular need. The user of this Standards Publication is cautioned to observe any health or safety regulations and rules relative to the use of the test procedures covered by this document. Requests for interpretation of this standard must b
33、e submitted in writing to: Insulated Cable Engineers Association, Inc. P.O. Box 1568 Carrollton, GA 30112 An official written interpretation will be made by the Association. Suggestions for improvements gained in the use of this publication will be welcomed by the Association. ICEA T-27-581/NEMA WC
34、53-2008 Page 1 Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Incorporated. Section 1 GENERAL 1.1 SCOPE This standard applies to the testing of extruded dielectric insulated power, control, instrumentation, and portable cables. 1.2
35、REFERENCES Included in this standard are many, but not all, of the test methods to which reference is made in ICEA/NEMA Standards for Cables. For undated references, the reference shall be to the latest issue. Copies of the following documents may be obtained from the appropriate source as follows:
36、1.2.1 Normative References American Society for Testing and Materials (ASTM) 100 Barr Harbor Drive West Conshohocken, PA 19428-2959 ASTM B 193-02 Resistivity of Electrical Conductor Materials, Test Method for ASTM D 257-99 DC Resistance or Conductance of Insulating Materials, Test Method for ASTM D
37、412-98a(02)e1 Vulcanized Rubber and Thermoplastic Elastomers Tension ASTM D 471-98e2 Rubber Property Effect of Liquids, Test Method for ASTM D 746-04 Brittleness Temperature of Plastics and Elastomers by Impact ASTM D 2132-03 Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Mate
38、rials, Test Method for ASTM D 2275-01 Voltage Endurance of Solid Electrical Insulating Materials Subjected to Partial Discharge (Corona) on the Surface, Test Method for ASTM D 2765-01 Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics, Test Method for ASTM D3349-99 Absorpt
39、ion Coefficient of Ethylene Polymer Material Pigmented with Carbon Black, Test Method for Global Engineering Documents 15 Inverness Way East Englewood, CO 80112-5776 ICEA T-28-562 Measurement of Hot Creep of Polymeric Insulations, Test Methods for ICEA T-29-520 Procedure for Conducting Vertical Cabl
40、e Tray Flame Tests with a Theoretical Heat Input Rate of 210,000 B.T.U./Hour ICEA T-30-520 Procedure for Conducting Vertical Cable Tray Flame Tests with a Theoretical Heat Input Rate of 70,000 B.T.U./Hour ICEA T-24-380 Guide for Partial Discharge Test Procedure ICEA T-25-425 Guide for Establishing S
41、tability of Volume Resistivity of Conducting Polymeric Component of Power Cables ICEA T-26-465 Guide for Frequency of Sampling Extruded Dielectric Power, Control, Instrumentation, and Portable Cables for Test ICEA T-27-581/NEMA WC 53-2008 Page 2 Copyright 2008 by the National Electrical Manufacturer
42、s Association and the Insulated Cable Engineers Association, Incorporated. ICEA T-28-562 Test Method for Hot Creep of Polymeric Insulations ICEA T-31-610 Guide for Conducting a Longitudinal Water Penetration Resistance Test for Sealed Conductor ICEA T-32-645 Guide for Establishing Compatibility of S
43、ealed Conductor Filler Compounds with Conducting Stress Control Materials ICEA T-34-664 Guide for Conducting a Longitudinal Water Penetration Resistance Tests on Longitudinal Water Blocked Cables National Technical Information Service U.S. Department of Commerce Springfield, VA 22161 National Bureau
44、 of Standards Handbook No. 100 Copper Wire Tables (February 4, 1966) National Bureau of Standards Handbook No. 109 Aluminum Wire Tables (February 1972) Not all the tests mentioned above are relevant for a given cable design or a given application. A few specialized test methods are described in ICEA
45、 Standard Publication S-94-649, Standard For Concentric Neutral Cables Rated 5,000 46,000 Volts. When a procedure for measuring a specified parameter is not specified, that parameter shall be determined by any suitable means. When another standard is referenced in this document, its title and date o
46、f issue may be found in Section 1. The reference is only to that specified document. In this standard, temperatures are expressed in degrees Celsius, weights in grams, and metal resistivities in nanoohm-meter. Other properties are expressed in U.S. customary units throughout this standard. Approxima
47、te International System of Units (SI) equivalents are included for information only. Room temperature is defined as 255oC. Where this temperature range cannot be maintained, (test) measurements may be made at the prevailing ambient room temperature, which shall be recorded. The Fahrenheit equivalent
48、s for Celsius degrees may be calculated by the equation 32deg8.1deg += CF The ounce equivalents to grams may be calculated by dividing the number of grams by 28.4. The ohm cmil per ft equivalents to nanoohmmeter may be calculated by multiplying the nanoohmmeter value by 0.602. ICEA T-27-581/NEMA WC 53-2008 Page 3 Copyright 2008 by the National Electrical Manufacturers Association and the Insulated Cable Enginee
