1、Designation: B500/B500M 12 (Reapproved 2018)Standard Specification forMetallic Coated or Aluminum Clad Stranded Steel Core forUse in Overhead Electrical Conductors1This standard is issued under the fixed designation B500/B500M; the number immediately following the designation indicates the yearof or
2、iginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers 7-wire, 19-wire, 37-wire, and61-wir
3、e zinc-coated (galvanized), zinc-5 % aluminum-mischmetal alloy-coated or aluminum clad stranded steel coreintended for use in overhead electrical conductors.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not
4、be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establ
5、ished in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2B498/B498M Specification for Zinc-Coated (Galvanized)Steel Core
6、Wire for Use in Overhead Electrical Conduc-torsB957 Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire forOverhead Electrical ConductorsB958 Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc5% Aluminum-Mischmetal Alloy-Coat
7、ed Steel Core Wire for Use in Overhead ElectricalConductorsB606 Specification for High-Strength Zinc-Coated (Galva-nized) Steel Core Wire for Aluminum and Aluminum-Alloy Conductors, Steel ReinforcedB802/B802M Specification for Zinc5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for AluminumCond
8、uctors, Steel Reinforced (ACSR)B803 Specification for High-Strength Zinc5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use inOverhead Electrical ConductorsE83 Practice for Verification and Classification of Exten-someter SystemsB502 Specification for Aluminum-Clad Steel Core Wire forUse in
9、 Overhead Electrical Aluminum Conductors3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 lotunless otherwise specified in the contract ororder, a lot shall consist of all coils or reels of strand of thesame diameter and unit lengths submitted for inspection at thesame time.3.1.
10、2 production lotall of the wire spools loaded into astranding machine that are used to produce a completed strandcable.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Length of each construction,4.1.2 Constructional description of
11、stranded core (forexample, 7 0.0943 in. or 19 0.0977 in.) (8.1 and 8.2),4.1.3 The multiple length of stranded core and the totalnumber of multiple lengths per reel, if allowed (8.3 and Section15),4.1.4 Strength and coating type or aluminum clad (Section8),4.1.5 Direction of lay of outer layer (Secti
12、on 7),4.1.6 Packaging (Section 15), and4.1.7 Place of inspection (Section 13).5. Material5.1 The coated or aluminum clad steel wire used in theproduction of the stranded core shall, prior to stranding, meetall of the requirements of the appropriate specification thatfollows:1This specification is un
13、der the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.05 onConductors of Ferrous Metals.Current edition approved March 1, 2018. Published March 2018. Originallyapproved in 1969. Last previous edition approved in 2012 as B500/B500M 12.
14、DOI: 10.1520/B0500_B0500M-12R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,
15、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides an
16、d Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.15.1.1 Specification B498/B498M,5.1.2 Specification B606,5.1.3 Specification B802/B802M, and5.1.4 Specification B803.5.1.5 Specification B957.5.1.6 Specification B958.5.1.7 Specification B502.6. Join
17、ts6.1 There shall be no joints of any kind made in the finishedzinc-coated, zinc-5 % aluminum-mischmetal alloy-coated oraluminum clad steel wires.7. Stranding7.1 The lay length of the 6-wire layer of 7 and 19-wirestranded core shall be not less than 16 or more than 26 timesthe outside diameter of th
18、e 6-wire layer. (Outside diameter isthree times nominal wire diameter.)7.2 The lay length of the 12-wire layer of a 19-wire strandedcore shall be not less than 14 or more than 22 times the outsidediameter of the 12-wire layer. (Outside diameter is five timesnominal wire diameter.)7.3 The lay length
19、of the 18-wire layer of a 37-wire strandedcore shall be not less than 14 or more than 20 times the outsidediameter of the 18-wire layer. (Outside diameter is seven timesnominal wire diameter.)7.4 The lay length of the 24-wire layer of a 61-wire strandedcore shall be not less than 14 or more than 18
20、times the outsidediameter of the 24-wire layer. (Outside diameter is nine timesnominal wire diameter.)7.5 The steel wires shall be so stranded that when thestranded core is cut the individual wires can be readilyregrouped and then held in place by one hand.7.6 For construction containing 19 or more
21、wires, thedirection of lay will alternate with each layer.7.7 The direction of lay of the outer layer shall be asspecified by the purchaser at the time of placing the order.8. Construction and Recommended Standard Stranded-Core Lengths8.1 Overhead Electrical Conductors may be constructedusing steel
22、core wire with any one of the protective coatings oraluminum clad and associated strength grades. The acceptablecore wires are produced to ASTM Specifications shown inSection 5 of this standard.8.2 The number and diameters of the steel wires shallconform to the requirements in respective ASTM Conduc
23、torStandards.8.3 Recommended standard unit-stranded-core multiplelengths are given in respective ASTM Conductor Standards.9. Length Tolerance9.1 All lengths of stranded core shall be furnished to alength tolerance of 62%.10. Tensile Properties10.1 The rated ultimate strength or strength at 1 % exten
24、-sion of stranded core for overhead electrical conductors shallbe taken as that percentage according to the number of wires,indicated below, of the sum of the strengths of the steel wires,calculated from their specified nominal wire diameter and theappropriate specified minimum stress at 1 % extensi
25、on orultimate strength given in Specifications B498/B498M, B606,B802/B802M, B803, B957, B958 or B502:7 2 wire strand 2 96% of sum of components19 2 wire strand 2 93% of sum of components37 2 wire strand 2 91% of sum of components61 2 wire strand 2 90% of sum of components10.2 Stranded steel core sam
26、ples shall sustain loads equal toor greater than the values computed by the method of 10.1.Compliance can be shown either by testing the completedstrand or by calculation using the strands individual wireproperties (e.g., ultimate strength or stress at 1% extension).When calculating the strand stren
27、gths using the strandsindividual wire properties, it shall be computed as the percent-age of the sum of the actual wire strengths as indicated below:7 2 wire strand 2 96% of sum of components19 2 wire strand 2 93% of sum of components37 2 wire strand 2 91% of sum of components61 2 wire strand 2 90%
28、of sum of components10.3 For determining compliance with the rated strength at1 % extension, use a Class B-1, B-2, or C extensometer asdescribed in Practice E83. The gage length shall be not lessthan 20 in. (500 mm).10.4 When testing the completed stranded core strand,apply an initial load computed
29、from the formula below andTable 1. Attach the extensometer and set to the appropriateInitial Setting from Table 1. Then increase the load until theindicated total extension is 1 % (0.0100 in./in. or 0.0100mm/mm). Record the load as the strength at 1 % extension.Load 5 initial stress 3 number of wire
30、s in strand3 nominal wire diameter!230.7854.10.5 Stranded steel core shall meet the minimum require-ments for tensile strength at 1 % extension except as set forthin 10.6.TABLE 1 Initial Setting for Determining Stress at 1 % ExtensionNominal Wire Diameter Initial Stress Initial Setting of Extensomet
31、erin. mm psi kgf/mm2MPa in./in. mm/mm0.05000.0899 1.2702.283 14 000 9.84 96.5 0.0005 0.00050.09000.1199 2.2863.045 28 000 19.7 193 0.0010 0.00100.12000.1899 3.0484.823 42 000 29.5 290 0.0015 0.0015B500/B500M 12 (2018)210.6 Purchasers of core intended for use in conductorconstructions with annealed a
32、luminum wires, such as ACSS,may request the stranded steel core be compliant only withultimate tensile strength and may waive compliance with the 1% extension tensile requirement. This use of the ultimatetensile requirement as an alternate to the 1 % extensionrequirement shall be by agreement betwee
33、n the purchaser andproducer and shall be noted on product compliance documen-tation B498/B498M, B606, B802/B802M, B803, B957, B958or B502.11. Workmanship11.1 The finished stranded core shall be uniform in diameterand shall be free from imperfections not consistent with goodcommercial stranding pract
34、ice. The stranded core shall be freefrom waviness and kinks.12. Number of Tests12.1 Samples from each lot shall be taken in accordancewith Table 2.Alot shall be defined as all the packages (reels orcoils) of the same size, construction, length, and type ofcoating offered for shipment at one time.12.
35、2 An alternative to 12.1 is to use the strand productionlot. Testing would be completed on the individual wires,completed strand, or both, sampled to be representative of allstrand reels produced from that strand production lot. If theproducer makes this election, the purchaser still reserves therig
36、ht to test wires or strand from the offered lot as outlined in12.1. With this option, the producer shall report the test resultsof all reels in the shipment in lieu of using Table 2.12.3 Samples shall be tested for compliance with Sections 7and 10 and as required in the applicable wire standardrefer
37、enced in Section 2.13. Inspection13.1 All tests and inspection shall be made at the place offinal manufacture unless otherwise agreed upon between theproducer and the purchaser at the time of purchase.14. Rejection14.1 Failure of any of the test specimens to comply with therequirements of this speci
38、fication shall constitute grounds forrejection of the lot represented by the specimen. The lot may beresubmitted for inspection by testing every package (reels orcoils) for the characteristic in which the specimen failed andsorting out the defective packages.15. Packaging and Package Marking15.1 Pac
39、kage sizes and kind of package shall be agreedupon between the manufacturer and the purchaser.15.2 When permitted by the purchaser two or more unitlengths of stranded core may be shipped on one reel. If themultiple length is continuous, with no welds or strand joints, aflag or marker shall be placed
40、 in the reel where the unit lengthends. If the multiple length on the reel consists of two or moreseparate lengths, they must not be joined. The free ends mustbe secured to the reel head, and a flag or warning marker shallbe inserted in the winding, warning of the approaching end.15.3 The net weight
41、, length or lengths, construction (strands wire diameter), direction of lay of outside layer, type of wirecoating, purchase order number, Specification B500/B500M,and manufacturers name shall be marked on a tag and attachedon the outside of the package. If multiple lengths are allowed,marking must s
42、how position and footage of each length andwhether “continuous or “separated lengths.”16. Keywords16.1 metallic coated steel wire strand; steel core wire strand;steel wire strandASTM International takes no position respecting the validity of any patent rights asserted in connection with any item men
43、tionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee
44、 and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meetin
45、g of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO
46、Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 2 Number of SamplesNo. of Packages in Lot No. of Samples1to3 all4to30 3Over 30 10 %B500/B500M 12 (2018)3
