1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA WC 57-2014Standard for Control, Thermocouple Extension, and Instrumentation CablesApproved as an American National Standard ANSI Approval Date: October 31, 2014 ANSI/NEMA WC 57-2014 ICEA S-73-532-2014 Standard for Contr
2、ol, Thermocouple Extension, and Instrumentation Cables Prepared and Sponsored by: Insulated Cable Engineers Association, Inc. P.O. Box 1568 Carrollton, Georgia 30112 Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org 201
3、4 National Electrical Manufacturers Association (NEMA) and the Insulated Cable Engineers Association, Inc. (ICEA). 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 th
4、e International and Pan American copyright conventions. 2014 National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Inc. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the develop
5、ment 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) and the Insulated Cable Engineers Assoc
6、iation (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 publication. While NEMA and ICEA admini
7、ster the process and establish 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 judgments contained in its standards and guideline publications. NEMA and ICEA disclai
8、m 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 and ICEA disclaim and make no guaranty or wa
9、rranty, 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 undertake to guarantee the performance of any in
10、dividual 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 entity, nor are NEMA and ICEA undertaking to perfo
11、rm 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. Information and other sta
12、ndards 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 enforce compliance with the contents of this do
13、cument. 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 attributable to NEMA and ICEA and is solely the re
14、sponsibility of the certifier or maker of the statement. ANSI/NEMA WC 57-2014/ICEA S-73-532-2014 Page i 2014 National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Inc. Foreword The Standard for Control, Thermocouple Extension and Instrumentation Cables, ICEA S-
15、73-532, NEMA WC 57-2003, was developed by the Insulated Cable Engineers Association, Inc. (ICEA) and approved by the National Electrical Manufacturers Association (NEMA). Unless otherwise noted as Authorized Engineering Information, this standards publication has been approved by NEMA as a NEMA Stan
16、dard. ICEA/NEMA standards are adopted in the public interest and are designed to eliminate misunderstanding between the manufacturer and the user and to assist users in selecting and obtaining the proper product for their particular needs. Existence of an ICEA/NEMA standard does not in any respect p
17、reclude 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 manufacture and use of cable made in conformity with this standard. This standard does not specify any specific freq
18、uencies for sampling for test purposes, cable products, or components. One program of sampling frequencies is given in Publication ICEA T-26-465/NEMA WC 54-2013. Requests for interpretation of this standard must be submitted in writing to the Insulated Cable Engineers Association, Inc., PO Box 1568,
19、 Carrollton, GA 30112. An official written interpretation will be provided, once approved by ICEA and NEMA. Suggestions for improvements gained in the use of this publication are welcomed by the Association. ANSI/NEMA WC 57-2014/ICEA S-73-532-2014 Page ii 2014 National Electrical Manufacturers Assoc
20、iation and the Insulated Cable Engineers Association, Inc. Contents Condensed* Section GENERAL . 1 CONDUCTORS 2 INSULATIONS 3 SHIELDINGS AND COVERINGS . 4 ASSEMBLY, FILLERS, AND CONDUCTOR IDENTIFICATION 5 TESTING AND TEST METHODS . 6 SPECIAL CONSTRUCTIONS. 7 ANNEXES . 8 *See next pages for a more de
21、tailed Table of Contents. ANSI/NEMA WC 57-2014/ICEA S-73-532-2014 Page iii 2014 National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Inc. Contents Foreword i ContentsCondensed ii Scope vi Section 1 GENERAL 1 1.1 GENERAL INFORMATION 1 1.2 INFORMATION TO BE SUPP
22、LIED BY PURCHASER 2 Section 2 CONDUCTORS 3 2.1 GENERAL 3 2.2 WIRES, PHYSICAL AND ELECTRIC PROPERTIES 3 2.3 COPPER CONDUCTORS . 3 2.3.1 Wires 3 2.3.2 Solid Conductors 3 2.3.3 Stranded Conductors . 3 2.3.4 Conductor DC Resistance per Unit Length 3 2.3.5 Conductor Diameter . 5 2.4 CONDUCTORS FOR THERMO
23、COUPLE EXTENSION WIRES 6 2.4.1 Conductor Material . 6 2.4.2 Size and Diameter . 6 2.4.3 Direct-current (DC) Resistance of Conductors 7 2.4.4 Temperature Limits of Conductors 7 2.4.5 Limits of Error of Conductors . 7 Section 3 INSULATIONS 9 3.1 GENERAL 9 3.2 MATERIALS . 9 3.3 THICKNESS . 9 3.3.1 SR 9
24、 3.3.2 PE 9 3.3.3 PVC 10 3.4 REQUIREMENTS 11 3.4.1 Crosslinked Polyethylene (XLPE) Insulation, Type I and Type II 11 3.4.2 Ethylene Propylene Rubber (EP) Insulation, Type I and Type II . 11 3.4.3 Ozone Resisting Silicone Rubber (SR) Insulation . 11 3.4.4 Chlorosulfonated Polyethylene (CSPE) Insulati
25、on 11 3.4.5 Polyvinyl Chloride (PVC) Insulation . 11 3.4.6 Polyvinyl Chloride/Nylon (PVC/Nylon) Insulation. 12 3.4.7 Polyethylene (PE) Insulation 12 3.4.8 Composite Insulation . 12 3.4.9 Styrene Butadiene Rubber (SBR) Insulation . 12 3.4.10 Thermoplastic Elastomer (TPE) Insulation, Type I and Type I
26、I . 12 3.4.11 Jacket over Insulation 12 3.4.12 Repairs . 12 3.5 VOLTAGE TESTS 12 3.5.1 Production Tests 12 3.5.2 Acceptance Testing After Installation 13 3.6 INSULATION RESISTANCE . 18 3.7 TYPE A FLAME TEST . 18 3.8 TYPE B FLAME TEST . 18 ANSI/NEMA WC 57-2014/ICEA S-73-532-2014 Page iv 2014 National
27、 Electrical Manufacturers Association and the Insulated Cable Engineers Association, Inc. Section 4 SHIELDINGS AND COVERINGS 19 4.1 SHIELDINGGENERAL . 19 4.1.1 Shield Continuity 19 4.1.2 Shield Isolation . 19 4.1.3 Metal Tape Shields 19 4.1.4 Metal Braid Shields 19 4.1.5 Metal Wire Shields . 20 4.2
28、JACKETS . 20 4.2.1 Thickness . 21 4.2.2 Requirements . 21 4.2.3 Binder . 21 4.3 METALLIC AND ASSOCIATED COVERINGS 21 4.3.1 Types of Metallic Coverings . 21 4.3.2 Core Covering for Nonshielded and Nonjacketed Cable with Metallic Armor . 22 4.3.3 Interlocked Metal Tape Armor . 22 4.3.4 Galvanized Stee
29、l Wire Armor. 25 4.3.5 Flat Metal Tape Armor . 27 4.3.6 Continuously Corrugated Metal Armor 28 4.3.7 Thermoplastic or Crosslinked Coverings over Metallic Armor . 29 Section 5 ASSEMBLY, FILLERS, AND CONDUCTOR IDENTIFICATION 31 5.1 ASSEMBLY OF MULTIPLE CONDUCTOR CABLES . 31 5.1.1 Round Cables 31 5.1.2
30、 Subassemblies . 31 5.1.3 Flat Twin Cables 31 5.2 FILLERS . 31 5.3 BINDERS . 31 5.4 CONDUCTOR IDENTIFICATION 31 Section 6 TESTING AND TEST METHODS . 33 6.1 TESTINGGENERAL . 33 6.2 CONDUCTOR TEST METHODS 33 6.3 THICKNESS MEASUREMENTS FOR INSULATIONS AND NONMETALLIC JACKETS 33 6.4 PHYSICAL AND AGING T
31、ESTS FOR INSULATIONS AND JACKETS 33 6.4.1 Size and Preparation of Specimens 33 6.4.2 Calculation of Test Specimen Area . 33 6.4.3 Physical Test Procedures 34 6.5 TENSILE STRENGTH TEST . 34 6.6 TENSILE STRESS TEST. 34 6.7 ELONGATION TEST . 34 6.8 SET TEST 34 6.9 AGING TESTS . 35 6.9.1 Test Specimens
32、. 35 6.9.2 Air Oven Test . 35 6.9.3 Oil Immersion Test . 35 6.9.4 Hot Creep Test . 35 6.9.5 Heat Distortion for Insulated Conductors . 35 6.9.6 Heat Distortion for Thermoplastic Jackets . 35 6.9.7 Heat Shock for Thermoplastic Jackets 35 6.9.8 Nylon Wrap Test 35 6.10 OZONE RESISTANCE TEST 36 6.11 THI
33、CKNESS OF COVERINGS 36 6.12 ENVIRONMENTAL CRACKING 36 6.13 ABSORPTION COEFFICIENT 36 6.14 ACCELERATED WATER ABSORPTION 36 6.14.1 General 36 6.14.2 Electrical Method (EM-60) . 36 ANSI/NEMA WC 57-2014/ICEA S-73-532-2014 Page v 2014 National Electrical Manufacturers Association and the Insulated Cable
34、Engineers Association, Inc. 6.14.3 Gravimetric Method 37 6.15 COLD BEND 37 6.16 FLAME TESTING . 37 6.16.1 Type A 37 6.16.2 Type B 38 6.17 VOLTAGE TESTS 38 6.17.1 AC Voltage Test . 38 6.17.2 DC Voltage Test . 38 6.17.3 AC Spark Test 39 6.18 INSULATION RESISTANCE . 39 6.18.1 Determination of Temperatu
35、re Conversion Factors for Insulation Resistance 39 6.19 SPECIFIC SURFACE RESISTIVITY . 39 6.20 SHIELD CONTINUITY . 39 6.21 SHIELD ISOLATION 39 6.22 DIELECTRIC STRENGTH RETENTION . 39 Section 7 SPECIAL CONSTRUCTIONS 40 7.1 LOW-SMOKE, HALOGEN-FREE (LSHF) CABLES 40 7.1.1 Scope . 40 7.1.2 Conductors . 4
36、0 7.1.3 Insulation 40 7.1.4 Assembly 41 7.1.5 Shielding 41 7.1.6 Jacket . 41 7.1.7 Coverings over Metallic Armor . 41 7.1.8 Tests 42 7.2 125C CABLE 46 7.2.1 Scope . 46 7.2.2 Conductors . 46 7.2.3 Insulation 47 7.2.4 Assembly 47 7.2.5 Shielding 47 7.2.6 Jacket . 47 7.2.7 Voltage Tests . 48 Section 8
37、ANNEXES . 50 Annex A INDUSTRY STANDARD REFERENCES (Normative) 50 Annex B ADDITIONAL CONDUCTOR INFORMATION (Informative) 53 Annex C REPRESENTATIVE VALUES OF TENSILE STRENGTH AND ELONGATION FOR NON-MAGNETIC ARMOR MATERIALS (Informative) . 54 Annex D FLAME TESTING FINISHED CABLE (Informative) . 55 Anne
38、x E CONDUCTOR IDENTIFICATION FOR CONTROL CABLES (Informative) 56 Annex F RECOMMENDED BENDING RADII FOR CABLES (Informative) . 66 Annex G ACCEPTANCE TESTING AFTER INSTALLATION (Informative) . 68 Annex H OTHER TEST METHODS FOR INSTRUMENTATION CABLES (Informative) . 69 ANSI/NEMA WC 57-2014/ICEA S-73-53
39、2-2014 Page vi 2014 National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Inc. Scope This standard applies to materials, construction, and testing of multiconductor control, thermocouple extension, and instrumentation cables rated up to and including 125oC. Con
40、trol cables are multiconductor cables that convey electrical signals used for monitoring or controlling electrical power systems and their associated processes. Control cables convey signals between devices interfaced directly with the electrical power system, such as current transformers, potential
41、 transformers, relays, switches, and meters. Instrumentation cables and thermocouple extensions are multiconductor cables that convey low-energy electrical signals (circuits that are inherently power limited) used for monitoring or controlling electrical power systems and their associated processes.
42、 Instrumentation cables and thermocouple extensions convey signals from process monitors to process analyzers (usually electronic equipment) and from the analyzers to control equipment in the electric power system. Construction details and test requirements for cables rated above 125oC can be found
43、in the NEMA HP-100 series of standards. ANSI/NEMA WC 57-2014/ICEA S-73-532-2014 Page 1 2014 National Electrical Manufacturers Association and the Insulated Cable Engineers Association, Inc. Section 1 GENERAL 1.1 GENERAL INFORMATION This publication is arranged so that cables can be designated and se
44、lected in numerous constructions for a broad range of installation and service conditions. Parts 2 through 4 cover the major components of the cables: Part 2Conductors Part 3Insulations Part 4Shieldings and Coverings Each of these parts designates materials, material characteristics, dimensions, and
45、 tests applicable to the particular component. Part 5 covers assembly, cabling, and identification of individual insulated conductors, with or without associated shields. Part 6 describes some, but not all, of the test methods applicable for the component materials and completed cables. Other test m
46、ethods are found in ICEA T-27-581/NEMA WC 53. Part 7 contains special constructions. Part 8 contains annexes with reference data such as abbreviations, definitions, material characteristics, application, and installation information. Particular attention is called to Annex A (normative), which gives
47、 the title and date of industry standards and other publications referenced herein. In classifying components in this standard, the following definitions apply: metal tape: A relatively thin and narrow metal strip that includes straps and ribbons. jacket: A polymeric (nonmetallic) protective coverin
48、g applied over the insulation, core, sheath, or armor of a cable, e.g., a PVC jacket. A jacket is not impervious to water or other liquids. sheath: A metallic covering, impervious to water and other liquids, applied over the insulation, core, or jacket of a cable, e.g., a lead sheath. Conductor size
49、s are expressed by American Wire Gauge (AWG). Steel armor wire sizes are expressed by Birmingham Wire Gauge (BWG). Temperatures are expressed in degrees Celsius. The Fahrenheit equivalents of degrees Celsius can be calculated by the equation F = (1.8xC) + 32. Room temperature is defined as a temperature from 20C to 28C inclusive. Mass is expressed in grams (g). The ounce equivalents to grams can be calculated by dividing the number of grams by 28.35. Other values are expressed in non-
