ICEA S-121-733-2016 TREE WIRE AND MESSENGER SUPPORTED SPACER CABLE.pdf

1、 STANDARD FOR TREE WIRE AND MESSENGER SUPPORTED SPACER CABLE ANSI/ICEA S-121-733-2016 2016 by INSULATED CABLE ENGINEERS ASSOCIATION, Inc. ANSI/ICEA S-121-733-2016 ANSI/ICEA S-121-733-2016 STANDARD FOR Tree Wire and Messenger Supported Spacer Cable Standard ANSI/ICEA Publication S-121-733-2016 Develo

2、ped and Published By Insulated Cable Engineers Association, Inc. Approved by Insulated Cable Engineers Association, Inc.: June 2016 Approved by ANSI: September 23, 2016 Copyright 2016 by the Insulated Cable Engineers Association, Incorporated. All rights including translation into other languages,

3、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. ANSI/ICEA S-121-733-2016 NOTICE AND DISCLAIMER The information in this publication was considered technically sound

4、 by the consensus 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 Insulated Cable Engineers Association, In

5、c. (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 ICEA administers the pro

6、cess and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgements contained in its standards and guideline publications. ICEA disclaims liability for p

7、ersonal 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. ICEA disclaims and makes no guaranty or warranty, expressed or impl

8、ied, 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. ICEA does not undertake to guarantee the performance of any individual manufacturer or sellers

9、 products or services by virtue of this standard or guide. In publishing and making this document available, ICEA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is ICEA undertaking to perform any duty owed by any person or entity to someone

10、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 given circumstances. Information and other standards on the topic covered by this publication may

11、 be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. ICEA has no power, nor does it undertake to police or enforce compliance with the contents of this document. ICEA does not certify, test, or inspect products, des

12、igns, 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 ICEA and is solely the responsibility of the certifier or maker of the statement. FOREWORD ICEA standar

13、ds and guides are adopted in the public interest and are designed to eliminate misunderstanding between the manufacturer and user and to assist the user in selecting and obtaining proper products for his particular need. Existence of an ICEA standard or guide does not in any respect preclude the man

14、ufacture or use of products not conforming to the standard or guide. The user of this Standard is cautioned to observe any applicable health or safety regulations and rules relative to the manufacture and use of cable made in conformity with this Standard. This Standard hereafter assumes that manufa

15、cture, testing, installation and maintenance of cables defined by this publication will be performed only by properly trained personnel using suitable equipment. Requests for interpretation of this ICEA Standard must be submitted in writing (hard copy, email, or fax) to the Insulated Cable Engineers

16、 Association to the ICEA Secretary. The mailing address of Headquarters and a contact link are shown on the ICEA web site . An official written interpretation will be provided. The members of the ICEA working group contributing to the writing of this Standard consisted of the following: K. Nuckles,

17、Chairman J. Armstrong M. Bodziony R. Bristol F. Clark A. Davila B. FlemingF. Kuchta P. Leblanc M. Levitre J. Maximo H. Soleski C. Spradlin R. Szilagyi J. Weitzel R. YoungM. Zedack D. Zhao ICEA S-121-733-2016 Page iii Table of Contents Page Section 1 General 1.1 Scope 1 1.2 Design Options 1 1.3 Opera

18、ting Conditions 1 1.4 Testing and Test Frequency 2 1.5 Test Methods 2 1.6 Definitions 2 Section 2 Conductors 2.0 General 4 2.1 Physical and Electrical Properties 4 2.1.1 Copper Conductors 4 2.1.2 Aluminum Conductors 4 2.1.3 Aluminum Conductor, Coated-Steel Reinforced (ACSR) 4 2.1.4 Aluminum Conducto

19、r, Aluminum - Alloy Reinforced (ACAR) 5 2.2 Conductor Size Units 5 2.3 Conductor dc Resistance Per Unit Length 5 2.3.1 Direct Measurement of dc Resistance Per Unit Length 5 2.3.2 Calculation of dc Resistance Per Unit Length 6 2.4 Conductor Diameter 6 2.5 Water Blocking Components for Stranded Conduc

20、tors (Optional) 6 Section 3 Conductor Shield (Stress Control Layer) If Required 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 General Material Extruded Shield Thickness Voids Physical Requirements Electrical Requirements 3.5.1 Extruded Semiconducting Material 3.5.2 Semiconducting Tape Crosslinked (thermoset) Requ

21、irements Covering Removal Test 13 13 13 14 14 14 14 14 14 14 Section 4 Covering 4.0 General 15 4.1 Material 15 4.1.1 Requirements for 75C Covering for Normal Service Operation 15 4.1.2 Requirements for 90C Covering for Normal Service Operation 16 4.2 Covering Thickness Requirements 164.3 Covering Di

22、ameter Requirements 16 4.4 Covering Physical Requirements 16 4.5 Covering Electrical Requirements 17 4.6 Concentricity 17Section 5 Identification 5.1 Cable Identification (Optional) 20 5.1.1 Center Strand Identification (Optional) 20 5.1.2 Sequential Length Markings (Optional) 20 ICEA S-121-733-2016

23、 Page iii Section 6 Production Tests and Test Methods 6.1 General 21 6.1.1 Testing and Test Frequency 21 6.1.2 Test Method 21 6.2 Conductor Test Methods 21 6.2.1 Method for DC Resistance Determination 21 6.2.1.1 Retests for DC Resistance 22 6.3 Method for Measuring Physical and Air Oven Aging Proper

24、ties 22 6.4 Method for Measuring Heat Deformation 22 6.5 Method for Measuring Hot Creep 22 6.6 Volume Resistivity 22 6.6.1 Conductor Shield (Stress Control) 22 6.6.2 Test Equipment 23 6.6.3 Test Procedure 23 6.6.3.1 Two-electrode Method 23 6.6.3.2 Measurement 236.7 Wafer Boil Test for Thermoset Cond

25、uctor Shields 23 6.8 Covering Removal Test 23 6.9 Concentricity 24Section 7 Qualification Tests 7.1 General 26 7.2 Method for Determining Resistance to Environmental Stress Cracking of 75C Outer Layer Wall Material 26 7.2.1 Test Specimens 7.2.2 Test Procedure 7.3 Sunlight Resistance of Covering Mate

26、rials 26 7.3.1 Qualification 267.3.2 Sunlight Resistance 27 7.3.2.1 Carbon-Arc Weather-O-Meter 27 7.3.2.2 Xenon-Arc Weather-O-Meter 277.4 Method for Determining Track Resistance of Outer Layer Wall Material 27 7.5 Dielectric Constant 277.6 Method for Measuring the Absorption Coefficient of Black 75C

27、 Outer Wall Covering Material 27 Section 8 Appendices A Titles and Dates of Industry Standards Referenced in this Document 29 LIST OF TABLES 2-1 Aluminum 1350 Compact Round Conductor Constructions 7 2-2 Aluminum Conductors, Coated-Steel Reinforced (ACSR), and Aluminum-Clad Steel Reinforced (ACSR/AW)

28、 Constructions 8 2-3 Aluminum-Alloy 6201-T81 Conductor Constructions 9 2-4 Nominal DC Resistance at 25C Stranded Copper Conductor 10 2-5 Nominal Diameters for Copper and Aluminum Conductors 11 2-5 (Metric) Nominal Diameters for Copper and Aluminum Conductors 12 3-1 Extruded Conductor Shield Thicknes

29、s (When Used) 13 3-2 Extruded Conductor Shield Requirements 14 4-1 Conductor Sizes, Covering Thicknesses and Test Voltages 18 4-2 Covering Physical Requirements 19 6-1 Summary of Production Tests and Sampling Frequency Requirements 24 6-2 Plan C 25 7-1 Qualification Test Requirements 28ICEA S-121-73

30、3-2016 Page iv ICEA S-121-733-2016 Page 1 Section 1 GENERAL 1.1 SCOPE This standard applies to the materials, constructions, and testing of tree wire and messenger supported spacer cable. These conductors are intended primarily for the distribution of electrical energy under normal conditions of ove

31、rhead (aerial) installations. This standard covers both thermoplastic and crosslinked polyethylene constructions, rated for 75C or 90C normal service temperature. They are considered as covered conductors therefore the cables carry no voltage rating. The conductors must be installed on insulators an

32、d/or spacers adequate for the service voltage. The user may want to give consideration to the dielectric compatibility of the covering, insulator, spacer and tie wire. Line wire constructions are covered in ANSI/ICEA S-70-547 Standard for Weather-Resistant Polyethylene Covered Conductors. Messenger

33、wires are covered in ANSI/ICEA P-79-561 - Guide for Selecting Aerial Cable Messengers and Lashing Wires. 1.2 DESIGN OPTIONS The user of this standard should recognize that it covers many options. The user should select the necessary options required for a complete description of the covered conducto

34、rs. 1.3 OPERATING CONDITIONS The design and construction of the cable shall be such that the cable will operate satisfactorily under the normal conditions of overhead line (aerial) service with maximum conductor temperatures as follows: Conductor Maximum Rated Operating Temperature, C* Covering Type

35、 Normal Service Emergency Overload Short Circuit Thermoplastic Polyethylene 75 95 150Crosslinked Polyethylene 90 130 250 * Exception: When adequate knowledge of the thermal characteristics of a cable environment is lacking, the permissible conductor temperature should be reduced by 10C or in accorda

36、nce with available data. The 75C or 90C “Normal Service Operation“ temperature is the highest allowable temperature attained by the hottest portion of a cable line during daily operating load cycles. It shall be used in ampacity calculations where adequate information is known about the overall ther

37、mal characteristics of the cable environment to ensure that the normal service temperature will not be exceeded. The 95C or 130C “Emergency Overload Operation“ temperature is the highest allowable temperature attained by the hottest portion of a cable line during an emergency. Operation at that over

38、load temperature shall not exceed 100 hours in any twelve consecutive months or 500 hours during the lifetime ICEA S-121-733-2016 Page 2 of the cable for tree wire. Spacer cable shall not exceed 100 hours in any twelve consecutive months or 1500 hours during the lifetime of the cable. The 150C or 25

39、0C “Short Circuit Operation“ temperature is the highest allowable temperature attained by a phase conductor along any part of the cable line during a short circuit of a specified magnitude and number of cycles. See the latest edition of ICEA Publication P-32-382. 1.4 TESTING AND TEST FREQUENCY All c

40、ables shall comply with the requirements given in Parts 2, 3, 4 and 5. Testing and test frequency shall be as indicated in Table 6-1 “Summary of Production Tests and Sampling Frequency Requirements.” 1.5 TEST METHODS Except where test and measurement methods are specifically detailed or modified by

41、this standard, the methods and procedures used to determine compliance with the requirements are those applicable in the latest edition of ICEA T-27-581/NEMA WC 53 and the other industry standards referenced in this standard. 1.6 DEFINITIONS Concentricity: In a wire or cable, the measurement of the

42、location of the center of the conductor with respect to the geometric center of the surrounding covering. Covered Conductor (ICEA): A conductor covered with an extruded layer(s) having no voltage rating. Covered Conductor (NESC): A conductor covered with a dielectric having no rated insulating stren

43、gth or having a rated insulating strength less than the voltage of the circuit in which the conductor is used. Dielectric Constant: The ratio of the capacitance of a given configuration of electrodes with the material as a dielectric to the capacitance of the same electrode configuration with a vacu

44、um (or air for most practical purposes) as the dielectric. Filled Crosslinked Polyethylene: XLPE containing 10 percent or more of carbon black and/or mineral fillers by weight. Insulated Conductor (NESC): A conductor covered with a dielectric (other than air) having a rated insulating strength equal

45、 to or greater than the voltage of the circuit in which it is used. Line Wire: A non-track resistant covered conductor (see ICEA S-70-547). Spacer Cable: A track resistant covered conductor supported by a high strength neutral messenger through a series of space-maintaining insulated devices (spacer

46、s). The resulting close-proximity configuration minimizes the amount of space and hardware required for line installation. Thermoplastic: A polymeric material, which repeatedly can be softened by heating and hardened by cooling through a temperature range characteristic of the material and that, in

47、a softened state, can be shaped through the application of force. Thermoset: A polymeric material which when crosslinked, will not flow on subsequent heating. Crosslinking is accomplished either chemically or by irradiation. Tree Wire: Track resistant covered overhead conductor, used to directly rep

48、lace bare wire spans where trees crowd the right-of-way, such as in wooded residential areas, when a minimum interference with the environment is desired. ICEA S-121-733-2016 Page 3 Track Resistant: The property of a material to resist the development of a partially conducting path of localized dete

49、rioration on its surface under a given voltage and time. Unfilled Crosslinked Polyethylene: XLPE containing less than 10 percent of carbon black and/or mineral filler by weight. Water Blocking Components: A non-metallic material incorporated in a cable construction intended as an impediment to water penetration. A water blocking component can be a pumpable or extrudable conductor filler compound, a water swellable tape, yarn, or powder, or a combination thereof. XLPE: Crosslinked polyethylene ICEA S-121-733-2016 P