1、Designation: B502 10Standard Specification forAluminum-Clad Steel Core Wire for Use in OverheadElectrical Aluminum Conductors1This standard is issued under the fixed designation B502; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers round, aluminum-clad steelcore wire with two designations of tensile strengths,
3、 AW2(Normal Strength) and AW3 (High Strength).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 be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the
4、two systems may result in non-conformancewith the standard.1.2.1 For conductor sizes designated by AWG, the require-ments in SI units have been numerically converted fromcorresponding values stated or derived in inch-pound units. Forconductor sizes designated by SI units only, the requirementsare st
5、ated or derived in SI units.2. Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein.2.2 ASTM Standards:2B193 Test Method for Resistivity of Electrical ConductorMaterialsE8 Test Methods for
6、Tension Testing of Metallic Materials3. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Wire size: diameter in inches (see 6.1),3.1.3 Core Wire Strength, AW2 (Normal Strength) or AW3(High Strength) (see Tab
7、le 1 and Table 2),3.1.4 Package size: (see 17.1),3.1.5 Special packaging and package marking if required(see 16.1), and3.1.6 Place of inspection if other than place of manufacture(see 14.1).4. Materials and Manufacture4.1 The base metal shall be steel produced by the open-hearth, electric-furnace, o
8、r basic-oxygen process and shall beof such composition that the finished clad wire shall have theproperties and characteristics prescribed in this specification.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommitte
9、e B01.06 onComposite Conductors.Current edition approved April 1, 2010. Published May 2010. Originallyapproved in 1970. Last previous edition approved in 2007 as B502 02 (2007).DOI: 10.1520/B0502-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service
10、 at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Tensile Requirements for Normal Strength (AW2) ForACSR/AW2, ACSR/TW/AW2 and ACSS/AW2, ACSR/TW/AW2 TypeConductorsNominalDiameter,in. (mm)Stress at 1.0 %Ext
11、ension min,psi (MPa)Ultimate TensileStrength, min,psi (MPa)Elongation,min, %, 10 in.(250 mm)0.0770 to 0.1289 175 000 (1206) 195 000 (1344) 1.5(1.956 to 3.274), incl0.1290 to 0.1369 170 000 (1172) 190 000 (1310) 1.5(3.275 to 3.477), incl0.1370 to 0.1443 165 000 (1137) 185 000 (1275) 1.5(3.478 to 3.66
12、5), incl0.1444 to 0.1549 160 000 (1103) 180 000 (1241) 1.5(3.666 to 3.934), incl0.1550 to 0.1620 160 000 (1103) 175 000 (1206) 1.5(3.935 to 4.115), incl0.1621 to 0.1729 155 000 (1068) 170 000 (1172) 1.5(4.116 to 4.392), incl0.1730 to 0.1819 150 000 (1034) 165 000 (1137) 1.5(4.393 to 4.620), incl0.18
13、20 to 0.1880 145 000 (1000) 160 000 (1103) 1.5(4.621 to 4.775), inclTABLE 2 Tensile Requirements for High Strength (AW3) ForACSS/AW3 and ACSS/TW/AW3 Type conductorsNominalDiameter,in. (mm)Stress at 1.0 %Extension min,psi (MPa)Ultimate TensileStrength, min,psi (MPa)Elongation,min, %, 10 in.(250 mm)0.
14、0770 to 0.0899 190 000 (1310) 210 000 (1450) 1.5(1.956 to 2.283), incl0.0900 to 0.1199 185 000 (1280) 205 000 (1410) 1.5(2.284 to 3.045), incl0.1200 to 0.1399 180 000 (1240) 200 000 (1380) 1.5(3.046 to 3.553), incl0.1400 to 0.1880 170 000 (1170) 195 000 (1340) 1.5(3.554 to 4.775), incl1Copyright AST
15、M International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 The aluminum used for cladding shall have a purity andquantity sufficient to meet thickness and resistance require-ments of this specification (see 7.1 and 9.1).5. Tensile Properties5.1 Requireme
16、ntsThe aluminum-clad steel core wire shallconform to the tensile requirements prescribed in Table 1 andTable 2. Purchasers of core intended for use in conductorconstructions with annealed aluminum wires, such as ACSS/AW3, ACSS/TW/AW3 may request the stranded steel core becompliant only with ultimate
17、 tensile strength and may waivecompliance with the 1 % extension tensile requirement. Thisuse of the ultimate tensile requirement as an alternate to the 1% extension requirement shall be by agreement between thepurchaser and producer and shall be noted on product compli-ance documentation. In comput
18、ing stress at 1 % extension andultimate tensile strength, the actual diameter of the finishedwire shall be used.5.2 Elongation TestThe elongation shall be determined byan extensometer suitable for measuring elongation in 10.0 in.(250 mm) and equipped with a vernier or other instrumentreading to 0.00
19、1 in. (0.025 mm). It shall be attached to the testspecimen at a load equal to the initial tensile stress shown inTable 3 and Table 4. At this load the extensometer shall beadjusted to the initial setting shown in Table 3 and Table 4.Upon application of further load, the tension shall be read at anex
20、tensometer reading of 1.0 % to determine conformance withthe requirement in Table 1 and Table 2. Further elongation shallbe observed while applying a tension load to the specimen. Theelongation thus determined shall be not less than 1.5 % in 10.0in. (250 mm). A test in which the extensometer reading
21、 is lessthan 1.5 % shall be disregarded if the fracture occurs less than1.0 in. (25 mm) from either attachment. In this case, anotherspecimen from the same reel or coil shall be tested.5.3 The tension tests shall be made in accordance with TestMethods E8. The method for determining elongation is de-
22、scribed in the Procedures Section of Test Methods E8.6. Dimensions and Permissible Variations6.1 The size shall be expressed by the wire diameter indecimals of an inch to the nearest 0.0001 in. (0.003 mm).6.2 Within the range of diameters included in Table 5 thewire shall not vary from the nominal d
23、iameter by more than theamounts shown in this table. In computing permissible varia-tions, diameters shall be rounded to the nearest 0.0001 in.(0.003 mm).6.3 If accessible, one measurement shall be taken near eachend and one near the middle of the coil or reel. In the case ofreels, the center and on
24、e end may not be accessible and theprescribed measurement shall be taken along the length of theaccessible material. If any of the selected coils or reels fail toconform to the requirements as prescribed in 6.2, all coils orreels shall be measured in the manner specified.7. Thickness of Aluminum7.1
25、The aluminum thickness at any point shall be not lessthan 10 % of the nominal wire radius. Measurements shall beread to the nearest 0.001 in. (0.03 mm). In determining therequired or measured thickness, fractions of 0.0005 in. (0.013mm) or less shall be dropped and for fractions of greater than0.000
26、5 in. (0.013 mm), the next larger 0.001 in. (0.003 mm)shall be used.7.2 Measurements shall be made by using suitable electricalindicating instruments operating on the permeameter principle,or by direct measurement. For referee purposes, direct mea-surement shall be used to determine aluminum thickne
27、ss onspecimens taken from the ends of the coils.8. Density8.1 For the purpose of calculating mass, cross sections, etc.,the density of the wire shall be taken as 0.2381 lb/in.3(6.590g/cm3) at 20C.9. Resistance9.1 The electrical resistance of the wire shall be determinedby resistance measurements and
28、 maximum allowable resis-tance shall be based on the nominal diameter of the wire andthe resistivity value of 51.01V cmil/ft (0.08480 Vmm2/m) at20C. Electrical resistance is calculated by the followingequations:Resistance V/ft!5R/S (1)where:R = resistivity, rc mil/ft, andS = nominal diameter, milsor
29、,Resistance V/m!5R/C (2)TABLE 3 Initial Settings for Determining at 1 % Extension forNormal Strength (AW2)Nominal Diameter,in. (mm)Initial Stress,psi (MPa)Initial Setting ofExtensometer,% in./in. (cm/cm)0.0770 to 0.0999 11 800 (81) 0.0005 (0.05 % extension)(1.956 to 2.537), incl0.1000 to 0.1299 23 5
30、00 (162) 0.0010 (0.10 % extension)(2.538 to 3.299), incl0.1300 to 0.1880 35 300 (243) 0.0015 (0.15 % extension)(3.300 to 4.775), inclTABLE 4 Initial Settings for Determining at 1 % Extension forHigh Strength (AW3)Nominal Diameter,in. (mm)Initial Stress,psi (MPa)Initial Setting ofExtensometer,% in./i
31、n. (cm/cm)0.0770 to 0.0899 14 000 (100) 0.0005 (0.05 % extension)(1.96 to 2.283), incl0.0900 to 0.1199 28 000 (190) 0.0010 (0.10 % extension)(2.284 to 3.045), incl0.1200 to 0.1880 42 000 (290) 0.0015 (0.15 % extension)(3.046 to 4.775), inclTABLE 5 Wire Diameter VariationsNominal Diameter,in. (mm)Per
32、missible Variations inNominal Diameter,0.0770 to 0.0999 0.0015 in. (0.038 mm)(1.956 to 2.537), incl0.1000 to 0.1880 1.5 %(2.538 to 4.775), inclB502 102where:R = resistivity, rmm2/m, andC = nomimal cross section, mm29.2 When resistance measurements are made at tempera-tures other than 20C, correction
33、s shall be based on a tempera-ture coefficient of resistance of 0.0036/C (0.0020/F).9.3 Tests to determine conformance to the resistivity of 9.1shall be made in accordance with Test Method B193.10. Joints10.1 There shall be no joints of any kind made in thefinished wire.10.2 Joints may be made in th
34、e rods or semifinished wiresprior to drawing to final size. The finished wire at such jointsshall meet the requirements of 7.1.10.3 Welding equipment and procedure shall be such that itcan be demonstrated that the ultimate tensile strength of afinished wire specimen containing the welded section sha
35、ll benot less than the stress at 1.0 % extension as shown in Table 1and Table 2.10.4 A welded section, wherever encountered, shall not berequired to meet the stress at 1 % extension, elongation, andtorsion tests.11. Finish11.1 The surface of the wire shall be smooth and free fromimperfections not co
36、nsistent with good commercial practice.12. Number of Tests12.1 One test specimen shall be taken from each lot of tencoils as clad and drawn, before splitting into individual coils,and tested to determine compliance with Sections 5, 6, 7, 9, and13.13. Torsion Test13.1 The wire shall withstand without
37、 fracture not less than20 twists in a length equivalent to 100 times the nominaldiameter of the wire. In this test, the specimen shall be grippedat its ends in vises, one of which shall be free to movelongitudinally during the test. A small tensile load of approxi-mately 15 lb (67 N) shall be applie
38、d to the specimen duringtesting. The specimen shall be twisted by rotating one of thevises at a rate of approximately 15 twists/min in the samedirection until fracture occurs. The number of twists shall beindicated by a counter or other suitable device.13.2 Specimens after twisting to destruction sh
39、all not revealany seams, pits, slivers, or surface imperfections of sufficientmagnitude to indicate inherent defects or imperfections in thewire. Examination of the wire at the break shall show noseparation of the aluminum from the steel.14. Inspection14.1 Unless otherwise agreed upon, all tests and
40、 inspectionsshall be made at the place of manufacture. The manufacturershall afford the inspector representing the purchaser all reason-able facilities necessary to ensure that the material is beingfurnished in accordance with this specification.15. Rejection15.1 If the wire fails in the first test
41、to meet any require-ments of this specification, two additional tests for theserequirements shall be made on specimens of wire from thesame coil or reel. If failure occurs in either of these tests, thelot of wire shall be rejected. However, the lot may beresubmitted for inspection by testing every c
42、oil or reel for therequirement which caused the specimen to fail and sorting outthe defective coils or reels.16. Product Marking16.1 A weather-resistant tag shall be attached to the outsideof each coil or reel showing the manufacturers name ortrademark with the approximate length, net mass, and nomi
43、nalsize of wire. Each coil shall also have a tag inside the wrappingshowing the manufacturers name, the size, approximatelength, and net mass. If additional information is required thisshall be arranged with the manufacturer at the time ofpurchase.17. Packaging and Shipping17.1 Package size shall be
44、 agreed upon by the manufacturerand the purchaser in the placing of individual purchase orders.17.2 The wire shall be protected against damage in ordinaryhandling and shipping.18. Keywords18.1 aluminum-clad steel core wire for aluminum conduc-tors; aluminum-clad steel reinforced; aluminum-clad steel
45、supported; ACSR; ACSR/TW; ACSS; ACSS/TW; clad steelcore wireASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such pa
46、tent 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 and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited ei
47、ther for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair
48、 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 Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this stan
49、dard 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 ASTM website (www.astm.org/COPYRIGHT/).B502 103
