1、Designation: B 778 02 (Reapproved 2007)Standard Specification forShaped Wire Compact Concentric-Lay-Stranded AluminumConductors (AAC/TW)1This standard is issued under the fixed designation B 778; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers shaped wire compactconcentric-lay-stranded aluminum conductor (AAC
3、/TW) andits component wires for use as overhead electrical conductors(Explanatory Note 1 and Note 2).1.2 The values stated in inch-pound units are to be regardedas the standard with the exception of temperature and resistiv-ity. The SI equivalents of inch-pound units may be approxi-mate.NOTE 1AAC/TW
4、 is designed to increase the aluminum area for agiven diameter of conductor by the use of trapezoidally shaped wires(TW). The conductors consist of a central core of one round aluminumwire or a seven-strand compact round core surrounded by two or morelayers of trapezoidal aluminum 1350-H19 wires. Fo
5、r the purposes of thisspecification, the sizes listed are tabulated on the basis of the finishedconductor having an area equal to that of specific sizes of standard AAC(Table 1) or in fixed diameter increments (Table 2) so as to facilitateconductor selection.NOTE 2The aluminum and temper designation
6、s conform to ANSIStandard H 35.1. Aluminum 1350 corresponds to Unified NumberingSystem (UNS) A91350 in accordance with Practice E 527.2. 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
7、.2.2 ASTM Standards:2B 230/B 230M Specification for Aluminum 1350H19Wire for Electrical PurposesB 263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB 354 Terminology Relating to Uninsulated Metallic Elec-trical ConductorsE29 Practice for Using Significant Digits in Test
8、Data toDetermine Conformance with SpecificationsE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)2.3 Other Documents:ANSI H35.1 American National Standard Alloy and Tem-per Designation Systems for Aluminum3NBS Handbook 100 Copper Wire Tables4Aluminum Association Pub
9、lication 50 Code Words forOverhead Aluminum Electrical Conductors53. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Conductor size: kcmil area and diameter (Table 1 andTable 2),3.1.3 Special tension test,
10、if required (see 8.2),3.1.4 Place of inspection (Section 15),3.1.5 Package size and type (see 15.1),3.1.6 Special package markings, if required (Section 15),and3.1.7 Heavy wood lagging, if required (see 15.3).4. Requirement for Wires4.1 Before stranding, the trapezoidal aluminum wires shallconform t
11、o the requirements of Specification B 230/B 230Mexcept for shape and diameter tolerance. The tensile strengthand elongation requirements of trapezoidal wires shall be thesame as for round wires of equal area. The area tolerances shallbe such that the finished conductor conforms to Section 11.1This s
12、pecification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved Oct. 1, 2007. Published October 2007. Originallyapproved in 1987. Last previous edition approved in 2002
13、as B 778 02.2For 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.3Available from American National Standards Insti
14、tute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from National Institute of Standards and Technology (NIST), 100Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http:/www.nist.gov.5Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600,Arli
15、ngton, VA 22209, http:/www.aluminum.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Joints5.1 Electric-butt welds, electric-butt cold-upset welds, orcold-pressure welds may be made in the individual aluminumwires during the st
16、randing process. No weld shall occur within50 ft (15 m) of any other weld in the completed conductor(Explanatory Note 3).6. Lay6.1 The preferred lay of the outside layer of aluminum wiresof shaped wire aluminum conductors, having multiple layers ofaluminum wires is 11 times the outside diameter of t
17、heconductor but the lay shall not be less than 10 nor more than 14times that diameter (Explanatory Note 1).TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors Sized to Have AreasEqual to AAC SizeCode WordAAAC/TWConductor sizeNominal OutsideDiameterNu
18、mber ofAluminumWiresNumberof LayersNominal Mass Rated Strengthkcmil mm in. mm lb/1000ft kg/km 1000 lbf kNTulip/TW 336.4 170 0.612 15.5 17 2 315.3 469.4 6.02 26.8Canna/TW 397.5 201 0.661 16.8 17 2 372.6 554.7 6.96 31Cosmos/TW 477.0 242 0.720 18.3 17 2 447.1 665.6 8.36 37.2Zinnia/TW 500.0 253 0.736 18
19、.7 17 2 468.7 697.7 8.76 39Mistletoe/TW 556.5 282 0.775 19.7 17 2 521.6 776.5 9.75 43.4Meadowsweet/TW 600.0 304 0.803 20.4 17 2 562.4 837.2 10.52 46.8Orchid/TW 636.0 322 0.825 21.0 17 2 596.1 887.4 11.1 49.4Verbena/TW 700.0 355 0.864 21.9 17 2 656.1 976.7 12.3 54.7Nasturtium/TW 750.0 380 0.893 22.7
20、17 2 702.1 1045 13.1 58.3Arbutus/TW 795.0 403 0.919 23.3 17 2 745.1 1109 13.6 60.5Cockscomb/TW 900.0 456 0.990 25.1 31 3 843.6 1256 15.4 68.5Magnolia/TW 954.0 483 1.018 25.9 31 3 894.2 1331 16.4 72.9Hawkweed/TW 1000.0 507 1.041 26.4 31 3 937.3 1395 17.1 76.1Bluebell/TW 1033.5 524 1.057 26.8 31 3 968
21、.7 1442 17.7 78.7Marigold/TW 1113.0 564 1.095 27.8 31 3 1043.2 1553 19.1 85.0Hawthorn/TW 1192.5 604 1.132 28.8 31 3 1117.7 1664 20.4 90.7Narcissus/TW 1272.0 644 1.168 29.7 31 3 1192.2 1775 21.8 97.0Columbine/TW 1351.5 685 1.202 30.5 31 3 1266.3 1885 23.2 103Carnation/TW 1431.0 725 1.236 31.4 31 3 13
22、41.3 1997 24.0 107Coreopsis/TW 1590.0 805 1.315 33.4 49 4 1490.3 2219 27.0 120Jessamine/TW 1750.0 887 1.377 35.0 49 4 1640.3 2442 29.7 132Cowslip/TW 2000.0 1013 1.468 37.3 49 4 1893.0 2818 33.9 151Lupine/TW 2500.0 1266 1.648 41.9 71 5 2366.2 3522 41.9 186Trillium/TW 3000.0 1520 1.799 45.7 71 5 2839.
23、5 4227 50.3 224ACode words shown in this column are obtained from “Publication 50, Code Words for Overhead Aluminum Electrical Conductors,” by the Aluminum Association. Theyare provided for information only.TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Co
24、nductors, inFixed-Diameter IncrementsCode WordAAAC/TWConductor SizeNominal OutsideDiameterNumber ofAluminumWiresNumberof LayersNominal Mass Rated Strengthkcmil mm in. mm lb/1000 ft kg/km 1000 lbf kNLogan/TW 322.5 163 0.60 15.2 17 2 302.3 450 5.88 26.2384.5 195 0.65 16.5 17 2 360.4 536.5 6.74 30Wheel
25、er/TW 449.4 228 0.70 17.8 17 2 421.2 627 7.88 35.1521.7 264 0.75 19.1 17 2 489.0 728 9.14 40.7Robson/TW 595.8 302 0.80 20.3 17 2 558.4 831.3 10.44 46.4678.2 344 0.85 21.6 17 2 635.7 946.3 11.88 52.8McKinley/TW 761.5 386 0.90 22.9 17 2 713.7 1062.5 13.07 58.1854.2 433 0.95 24.1 17 2 800.6 1191.8 14.8
26、6 66.1Rainer/TW 918.8 465 1.00 25.4 31 3 861.2 1282 15.76 70.11020.0 517 1.05 26.7 31 3 956.0 1423.2 17.50 77.8Helens/TW 1123.1 569 1.10 27.9 31 3 1052.7 1567.1 19.26 85.71234.2 625 1.15 29.2 31 3 1156.8 1722.1 21.17 94.2Mazama/TW 1346.8 682 1.20 30.5 31 3 1262.3 1879.1 23.10 102.71467.9 744 1.25 31
27、.8 31 3 1375.9 2048.2 24.65 109.6Hood/TW 1583.2 802 1.30 33 34 3 1483.9 2209 26.59 118.31682.7 852 1.35 34.3 49 4 1577.5 2348.4 28.55 127Whitney/TW 1812.7 918 1.40 35.6 49 4 1699.0 2529.2 30.74 136.71954.3 990 1.45 36.8 49 4 1832.1 2727.4 33.16 147.5Powell/TW 2093.6 1061 1.50 38.1 49 4 1981.6 2949.9
28、 35.51 157.92245.4 1137 1.55 39.4 49 4 2125.7 3164.4 37.30 165.9Jefferson/TW 2388.1 1210 1.60 40.6 52 4 2260.3 3364.8 39.67 176.52514.8 1274 1.65 41.9 71 5 2379.5 3542.3 42.17 187.6Shasta/TW 2667.2 1351 1.70 43.2 71 5 2524.5 3758.1 44.74 1992844.5 1441 1.75 44.5 71 5 2692.2 4007.8 47.70 212.2Adams/T
29、W 3006.2 1523 1.80 45.7 71 5 2873.0 4276.9 50.43 224.3ACode words shown in this column are obtained from “Publication 50, Code Words for Overhead Aluminum Electrical Conductors,” by the Aluminum Association. Theyare provided for information only.B 778 02 (2007)26.2 The preferred lay of the layer imm
30、ediately beneath theoutside layer of aluminum wires is 13 times the outsidediameter of such layer but the lay shall be not less than 10 normore than 16 times that diameter.6.3 The lay of the inner layers of aluminum wires shall benot less than 10 nor more than 17 times the outside diameter ofsuch la
31、yer.6.4 The direction of lay of the outside layer of aluminumwires shall be right-hand.6.5 The direction of lay of the aluminum wires shall bereversed in successive layers.6.6 For the purpose of this specification the lay factor is thelength of lay of a given layer divided by its outside diameter.7.
32、 Construction7.1 The nominal aluminum cross-sectional area, the outsidediameter, the nominal number of aluminum wires, the numberof layers, the linear density, and the rated strength, of theshaped wire compact concentric-lay-stranded aluminum con-ductors, shall be as shown in Table 1 and Table 2.NOT
33、E 3Exception to 7.1. Because the final design of a shaped wirecompact conductor is contingent on several factors such as layer diameter,wire width and thickness, and the like, the actual configuration of a givensize may vary between manufacturers. This might result in a slightvariation in the number
34、 of wires and number of layers, from that shown inTable 1 and Table 2, and also in the dimensions of the individual wires.8. Rated Strength of Conductor8.1 The rated strength of a conductor, as shown in Table 1and Table 2, shall be taken as the percentage, indicated in Table3, in accordance with the
35、 number of aluminum layers, of thesum of the wire strengths calculated from the specifieddiameter of the round wires having the same area as thetrapezoidal wires used in the manufacture of the conductor, andthe appropriate minimum average tensile strength given inSpecification B 230.8.1.1 The rated
36、strengths of conductors calculated in accor-dance with 8.1 and 8.3 are listed in Table 1 and Table 2.8.2 Tests to confirm that the rated strength of the conductoris met are not required by this specification, but shall be madeif agreed upon between the manufacturer and the purchaser atthe time of pl
37、acing an order.When tested, the breaking strengthof the conductor shall be not less than the rated strength iffailure occurs in the free length at least 1 in. (25 mm) beyondthe end of either gripping device, or shall be not less than 95 %of the rated strength if failure occurs inside or within 1 in.
38、 ofthe end of either gripping device (Explanatory Note 2).8.3 Rated strength and breaking strength values shall berounded to three significant figures in the final value only, inaccordance with Practice E29.9. Density9.1 For the purpose of calculating mass per unit length,cross-sections, and the lik
39、e, the density of aluminum 1350 shallbe taken as 0.0975 lb/in.3(2705 kg/m3) at 20C.10. Mass and Electrical Resistance10.1 The mass per unit length and electrical resistance of aunit length of stranded conductor are a function of the length oflay. The approximate linear density and electrical resista
40、nce ofa stranded conductor may be determined using the standardincrements shown inTable 4.When greater accuracy is desired,the increment based on the actual lay of the conductor may becalculated (Explanatory Note 3).11. Variations in Area11.1 The area of cross-section of the aluminum wires of thecon
41、ductor shall be not less than 98 % nor more than 102 % ofthe area specified in column 1 of Table 1 and Table 2. The areaof each wire shall be determined by Test Method B 263.Inapplying this method, the increment in linear density resultingfrom stranding may be the applicable value specified in Table
42、4, or it may be calculated from the measured dimensions of thesample under test. In case of questions regarding area compli-ance, the actual linear density increment due to stranding shallbe calculated.11.2 The diameter of the finished conductor shall be not lessthan 99 % nor more than 101 % of that
43、 shown in Table 1 andTable 2 when measured with a diameter tape between theclosing dies and the capstan of the strander.12. Workmanship, Finish, and Appearance12.1 The conductor shall be clean and free from imperfec-tions not consistent with good commercial practice.13. Mechanical and Electrical Tes
44、ts13.1 Tests for mechanical and electrical properties of alu-minum wires shall be made before stranding (Explanatory Note4).14. Inspection14.1 Unless otherwise specified in the contract or purchaseorder, the manufacturer shall be responsible for the perfor-mance of all inspection and test requiremen
45、ts specified.14.2 All inspections and tests shall be made at the place ofmanufacture unless otherwise especially agreed upon betweenthe manufacturer and the purchaser at the time of the purchase.14.3 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable manufacturers
46、 facilities tosatisfy him that the material is being furnished in accordancewith this specification.TABLE 3 Rating FactorsNumber of Layers Rating Factor, %2 0.933 0.914 0.905 and above 0.89TABLE 4 Standard Increments Due to StrandingSize of Conductor, kcmilIncrement (Increase) of Mass perUnit Length
47、 and ElectricalResistance, %Over 3 000 to 4 000 4Over 2 000 to 3 000 32 000 and under 2B 778 02 (2007)315. Packaging and Package Marking15.1 Package sizes and kind of package, reels, etc. shall beagreed upon between the manufacturer and the purchaser.15.2 There shall be only one length of conductor
48、on a reel.15.3 The conductors shall be protected against damage inordinary handling and shipping. If heavy wood lagging isrequired, it shall be specified by the purchaser at the time ofplacing the order.15.4 The net mass, length, size, kind of conductor, strand-ing, and any other necessary identific
49、ation shall be marked ona tag attached to the conductor inside the package. This sameinformation, together with the purchase order number, themanufacturers serial number (if any), and all shipping marksand other information required by the purchaser shall appear onthe outside of the package.16. Keywords16.1 AAC/TW; aluminum conductor; compact conductor;compact conductor, aluminum; concentric-lay-stranded alumi-num conductor; electrical conductor; electrical conductor, alu-minum; shaped wire compact conductor; shaped wire compactconductor, aluminum; shaped wire conductor;
