1、Designation: B778 14Standard Specification forShaped Wire Compact Concentric-Lay-Stranded AluminumConductors (AAC/TW)1This standard is issued under the fixed designation B778; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 shaped wire compactconcentric-lay-stranded aluminum conductor (AAC/TW) andits component
3、 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 is designed to incre
4、ase 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. For the purposes of thi
5、sspecification, 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 designations conform to ANSIStan
6、dard H 35.1. Aluminum 1350 corresponds to Unified NumberingSystem (UNS) A91350 in accordance with Practice E527.2. 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:2B
7、230/B230M Specification for Aluminum 1350H19 Wirefor Electrical PurposesB263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsE29 Practice for Using Significant Digits in Test Data toDetermine Conforman
8、ce with SpecificationsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)2.3 Other Documents:ANSI H35.1 American National Standard Alloy and TemperDesignation Systems for Aluminum3NBS Handbook 100 Copper Wire Tables4Aluminum Association Publication 50 Code Words forOve
9、rhead 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, if required (see 8.2),3.1.4 P
10、lace 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 to the requirements of Specifi
11、cation B230/B230Mexcept 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 specification is under the juris
12、diction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved April 1, 2014. Published April 2014. Originallyapproved in 1987. Last previous edition approved in 2012 as B778 02 (2012).DOI: 10.1520/B
13、0778-14.2For 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 Institute
14、 (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,Arlingto
15、n, VA 22209, http:/www.aluminum.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Joints5.1 Electric-butt welds, electric-butt cold-upset welds, orcold-pressure welds may be made in the individual aluminumwires during the strandi
16、ng process. No weld shall occur within50 ft (15 m) of any other weld in the completed conductor(Explanatory Note 3).TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors Sized to Have AreasEqual to AAC SizeCode WordAAAC/TWConductor sizeNominal OutsideD
17、iameterNumber ofAluminumWiresNumberof LayersNominal Mass Rated Strengthkcmil mm in. mm lb/1000 ft 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 25
18、3 0.736 18.7 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
19、.893 22.7 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.
20、8 31 3 968.7 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
21、.4 31 3 1341.3 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
22、71 5 2839.5 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 A
23、luminum Conductors, in Fixed-DiameterIncrementsCode 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.
24、74 30Wheeler/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 1
25、191.8 14.86 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 7
26、44 1.25 31.8 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 4 198
27、1.6 2949.9 35.51 157.92245.4 1137 1.55 39.4 49 4 2125.7 3164.4 37.30 165.9Jefferson/TW2388.1 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
28、.2Adams/TW 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.B778 1426. Lay6.1 The preferred lay of the ou
29、tside layer of aluminum wiresof shaped wire aluminum conductors, having multiple layers ofaluminum wires is 11 times the outside diameter of theconductor but the lay shall not be less than 10 nor more than 14times that diameter (Explanatory Note 1).6.2 The preferred lay of the layer immediately bene
30、ath 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 layer.6.4 The d
31、irection 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. Construction
32、7.1 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 aluminumconductors, shall be as shown in Table 1 and Table 2.NOTE 3Exception to
33、 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 of wires and n
34、umber 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 number of alum
35、inum 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 B230/B230M.8.1.1 The rated strengths
36、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 placing an o
37、rder. 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. ofthe en
38、d 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 like, the de
39、nsity 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 resistance ofa s
40、tranded conductor may be determined using the standardincrements shown in Table 4. When greater accuracy isdesired, the increment based on the actual lay of the conductormay be calculated (Explanatory Note 3).11. Variations in Area11.1 The area of cross-section of the aluminum wires of theconductor
41、shall be not less than 98 % nor more than 102 % ofthe area specified in column 1 of Table 1 and Table 2. The totalarea of the aluminum wires in the conductor shall be deter-mined by Test Method B263. In applying this method, theincrement in linear density resulting from stranding may be theapplicabl
42、e value specified in Table 4, or it may be calculatedfrom the measured dimensions of the sample under test. In caseof questions regarding area compliance, the actual lineardensity increment due to stranding shall be calculated.11.2 The diameter of the finished conductor shall be not lessthan 99 % no
43、r more than 101 % of that 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. Mech
44、anical and Electrical Tests13.1 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 inspe
45、ction and test requirements specified.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 and ElectricalResistance, %Over 3 000 to 4 000 4Over 2 000 to
46、 3 000 32 000 and under 2B778 14314.2 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 reas
47、onable manufacturers facilities tosatisfy him that the material is being furnished in accordancewith this specification.15. 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 len
48、gth of conductor 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,stranding, and any other nece
49、ssary identification shall bemarked on a tag attached to the conductor inside the package.This same information, together with the purchase ordernumber, the manufacturers serial number (if any), and allshipping marks and other information required by the pur-chaser shall appear on the 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; sha
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