1、Designation: B229 12 (Reapproved 2017)Standard Specification forConcentric-Lay-Stranded Copper and Copper-Clad SteelComposite Conductors1This standard is issued under the fixed designation B229; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, 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 concentric-lay-stranded con-ductors made from uncoated hard-drawn ro
3、und copper wires incombination with hard-drawn round copper-clad steel wires forgeneral use as overhead electrical conductors.1.2 For the purpose of this specification, conductors areclassified under the following type designations (see Fig. 1):Type A Type GType C Type JType D Type KType E Type NTyp
4、e EK Type PType F Type V1.3 The SI values for density are regarded as the standard.For all other properties the inch-pound values are to beregarded as standard and the SI units may be approximate.1.4 This international standard was developed in accor-dance with internationally recognized principles
5、on standard-ization established 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:2B1 Specification for Hard-Drawn Copper
6、 WireB227 Specification for Hard-Drawn Copper-Clad Steel WireB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 ANSI Standard:C42 Definitions of Electrical Terms32.3 National In
7、stitute of Standards and Technology:NBS Handbook 100Copper Wire Tables43. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size and type;3.1.2 Conductor size: hard-drawn copper equivalent incircular-mil area or AWG (Se
8、ction 7 and Table 1);3.1.3 Type (see 1.2, Fig. 1, and Table 1);3.1.4 Direction of lay of outer layer, if other than left-hand(see 6.3);3.1.5 When physical tests shall be made (see section 8.2);3.1.6 Package size (see 14.1);3.1.7 Special package marking, if required (Section 15);3.1.8 Lagging, if req
9、uired (see 14.2); and3.1.9 Place of inspection (Section 13).4. Material for Wires4.1 The purchaser shall designate the size and type ofconductor to be furnished. The position of the hard-drawncopper wires and the copper-clad steel wires in the conductorcross section shall be as shown in Fig. 1.4.2 B
10、efore stranding, the wire used shall meet the require-ments of Specifications B1 and B227 that are applicable to itstype.5. Joints5.1 CopperWelds and brazes may be made in copper rodsor in copper wires prior to final drawing. Joints may not bemade in the finished copper wires composing concentric-la
11、y-stranded composite conductors containing a total of sevenwires or less. In other conductors, welds and brazes may bemade in the finished individual copper wires composing the1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility
12、 of Subcommittee B01.06 onBi-Metallic Conductors.Current edition approved April 1, 2017. Published April 2017. Originallyapproved in 1948. Last previous edition approved in 2012 as B229 12. DOI:10.1520/B0229-12R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM C
13、ustomer 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 (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from Nati
14、onal Institute of Standards and Technology (NIST), 100Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http:/www.nist.gov.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with i
15、nternationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1conductor, but shall be not closer than 50 f
16、t (15 m) to any otherjoint in the same layer in the conductor.5.2 Copper-Clad SteelJoints or splices may be made inthe finished individual copper-clad steel wires composingconcentric-lay-stranded conductors, provided that such jointsor splices have a protection equivalent to that of the wire itselfa
17、nd that they do not decrease the strength of the finishedstranded conductor below the minimum breaking strengthshown in Table 1. Such joints or splices shall be not closer than50 ft (15 m) to any other joint in the same layer in theconductor (Explanatory Note 1).6. Lay6.1 For Types A, C, and D condu
18、ctors, the preferred lay isapproximately 16.5 times the outside diameter of the com-pleted conductor, but shall be not less than 13 nor more than 20times this diameter.6.2 For all other types, the preferred lay of a layer of wiresis 13.5 times the outside diameter of that layer, but shall be notless
19、 than 10 nor more than 16 times this diameter.6.3 The direction of lay of the outer layer shall be left-handunless the direction of lay is specified otherwise by thepurchaser.6.4 The direction of lay shall be reversed in successivelayers.6.5 All wires in the conductor shall lie naturally in their tr
20、uepositions in the completed conductor. They shall tend to remainin position when the conductor is cut at any point and shallpermit restranding by hand after being forcibly unraveled at theend of the conductor.7. Construction7.1 The numbers and diameters of wires in the various typesof concentric-la
21、y-stranded composite conductors shall conformto the requirements prescribed in Table 1 (Explanatory Note 2).8. Physical and Electrical Tests8.1 Tests for the physical and electrical properties of wirescomposing concentric-lay-stranded composite conductors shallbe made before but not after stranding.
22、8.2 At the option of the purchaser or his representative,tension and elongation tests on wires before stranding may bewaived, and the completed conductor may be tested as a unit.The breaking strength of the conductors so tested shall be notless than the rated strength values shown in Table 2. The fr
23、eelength between grips of the test specimen shall be not less than24 in. (0.61 m), and care shall be taken to ensure that the wiresin the conductor are evenly gripped during the test (Explana-tory Note 3).9. Density9.1 For the purpose of calculating weights, cross sections,and so forth, the density
24、of the copper shall be taken as 8.89g/cm3at 20C (Explanatory Note 4 and Table 2).9.2 The density of both types of copper-clad-steel wire shallbe taken as stated in Table 2.10. Mass and Resistance10.1 The mass and electrical resistance of a unit length ofstranded conductor are a function of the lengt
25、h of lay. Theapproximate mass and electrical resistance may be determinedusing the standard increments shown in Table 3. When greateraccuracy is desired, the increment based on the specific lay ofthe conductor may be calculated (Explanatory Note 6). Refer-ence information is shown in Table X1.1 in A
26、ppendix X1.11. Variation in Area11.1 The area of cross section of the completed conductorshall be not less than 97 % of the nominal area. The area ofcross section of a conductor shall be considered to be the sumof the cross-sectional areas of its component wires at any pointwhen measured perpendicul
27、arly to their axes (ExplanatoryNote 8). For the purposes of determining conformance to thisstandard, a measured or calculated value for cross sectionalarea shall be rounded to four significant figures in accordancewith the rounding method of Practice E29.12. Finish12.1 The conductor shall be free of
28、 all imperfections notconsistent with the best commercial practice.13. Inspection13.1 Unless otherwise specified in the contract or purchaseorder, the manufacturer shall be responsible for the perfor-mance of all inspection and test requirements specified.FIG. 1 Standard Types of Composite Conductor
29、sB229 12 (2017)2TABLE 1 Construction Requirements and Breaking Strength of Concentric-Lay-Stranded Copper and Copper-Clad Steel CompositeConductorsNOTE 1Metric EquivalentsFor conductor size, 1 cmil = 0.0005067 mm2(round to four significant figures); for diameter 1 mil = 0.02540 mm(round to four sign
30、ificant figures); for breaking strength, 1 lb = 0.45359 kg (round to four significant figures).Conductor Size, Hard-Drawn CopperEquivalentATypeGrade 30 EHS Copper-Clad Steel WiresHard-Drawn CopperWiresRated BreakingStrength, min,lbBcmil AWGNumber ofWiresDiameter ofWires, milsNumber ofWiresDiameter o
31、fWires, mils350 000 . . . E 7 157.6 12 157.6 32 420350 000 . . . EK 4 147.0 15 147.0 23 850350 000 . . . V 3 175.1 9 189.3 23 480300 000 . . . E 7 145.9 12 145.9 27 770300 000 . . . EK 4 136.1 15 136.1 20 960300 000 . . . V 3 162.1 9 175.2 20 730250 000 . . . E 7 133.2 12 133.2 23 920250 000 . . . E
32、K 4 124.2 15 124.2 17 840250 000 . . . V 3 148.0 9 160.0 17 420211 600 0000 E 7 122.5 12 122.5 20 730211 600 0000 G 2 194.4 5 194.4 15 640211 600 0000 EK 4 114.3 15 114.3 15 370211 600 0000 V 3 136.1 9 147.2 15 000211 600 0000 F 1 183.3 6 183.3 12 290167 800 000 E 7 109.1 12 109.1 16 800167 800 000
33、J 3 185.1 4 185.1 16 170167 800 000 G 2 173.1 5 173.1 12 860167 800 000 EK 4 101.8 15 101.8 12 370167 800 000 V 3 121.2 9 131.1 12 200167 800 000 F 1 163.2 6 163.2 9980133 100 00 K 4 178.0 3 178.0 17 600133 100 00 J 3 164.8 4 164.8 13 430133 100 00 G 2 154.2 5 154.2 10 510133 100 00 V 3 108.0 9 116.
34、7 9846133 100 00 F 1 145.4 6 145.4 8094105 600 0 K 4 158.5 3 158.5 14 490105 600 0 J 3 146.7 4 146.7 10 970105 600 0 G 2 137.3 5 137.3 8563105 600 0 F 1 129.4 6 129.4 653683 690 1 N 5 154.6 2 154.6 15 41083 690 1 K 4 141.2 3 141.2 11 90083 690 1 J 3 130.7 4 130.7 900083 690 1 G 2 122.2 5 122.2 69568
35、3 690 1 F 1 115.3 6 115.3 526666 360 2 P 6 154.0 1 154.0 16 87066 360 2 N 5 137.7 2 137.7 12 68066 360 2 K 4 125.7 3 125.7 973066 360 2 J 3 116.4 4 116.4 732266 360 2 A 1 169.9 2 169.9 587666 360 2 G 2 108.9 5 108.9 562666 360 2 F 1 102.6 6 102.6 423352 620 3 P 6 137.1 1 137.1 13 91052 620 3 N 5 122
36、.6 2 122.6 10 39052 620 3 K 4 112.0 3 112.0 791052 620 3 J 3 103.6 4 103.6 595552 620 3 A 1 151.3 2 151.3 481041 740 4 P 6 122.1 1 122.1 11 42041 740 4 N 5 109.2 2 109.2 846041 740 4 D 2 161.5 1 161.5 734041 740 4 A 1 134.7 2 134.7 393833 090 5 P 6 108.7 1 108.7 931133 090 5 D 2 143.8 1 143.8 603533
37、 090 5 A 1 120.0 2 120.0 319326 240 6 D 2 128.1 1 128.1 494226 240 6 A 1 106.8 2 106.8 258526 240 6 C 1 104.6C2 104.6 214320 820 7 D 2 114.1 1 114.1 402220 820 7 A 1 126.6 2 89.5 2754B229 12 (2017)313.2 All inspections and tests shall be made at the place ofmanufacture unless otherwise especially ag
38、reed to between themanufacturer and the purchaser at the time of the purchase.13.3 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable manufacturers facilities nec-essary to ensure that the material is being furnished inaccordance with this specification.14. Packag
39、ing and Shipping14.1 Package sizes for conductors shall be agreed upon bythe manufacturer and the purchaser in the placing of individualorders (Explanatory Note 9).14.2 The conductors shall be protected against damage inordinary handling and shipping. If heavy wood lagging isrequired, it shall be sp
40、ecified by the purchaser at the time ofpurchase.15. Marking15.1 The net mass, length (or lengths, and number oflengths, if more than one length is included in the package),size, type of conductor, purchase order number, and any othermarks required by the purchase order shall be marked on a tagattach
41、ed to the end of the conductor inside of the package. Thesame information, together with the manufacturers serialnumber (if any) and all shipping marks required by thepurchaser, shall appear on the outside of each package.16. Keywords16.1 composite conductors; concentric-lay-stranded copperconductor
42、; copper-clad steel conductor; copper electrical con-ductor; electrical conductor; electrical conductorcopper;stranded copper conductorEXPLANATORY NOTESNOTE 1Joints or splices in individual copper-clad steel wires in theirfinished size are made by electrical butt welding. Two types of joints areused
43、 and are described as follows:(a) Weld-Annealed JointsAfter butt welding, the wire is annealed fora distance of approximately 5 in. (127 mm) on each side of the weld. Theweld then is protected from corrosion with one of two approaches:(1) Asnug-fitting seamless copper sleeve that extends at least38
44、in. (9.5mm) on each side of the weld and that is thoroughly sealed to the wirewith solder. The wall thickness of the sleeve is at least 10 % of the radiusof the wire.(2) Protect the weld from corrosion and ensure acceptable conductivitythrough the use of silver solder that extends at least38 in. (9.
45、5 mm) oneach side of the weld.This joint has a tensile strength of approximately 60 000 psi (415 MPa).This is less than the strength of the individual wires, but an allowance ismade for this in the rated strength of the conductor as a whole. Thecompleted conductor when containing such joints is requ
46、ired to have thefull rated strength.This type of joint is only slightly larger than the wire itself and isapplicable for 7-wire composite conductors (except Types F and G) andfor 12- and 19-wire composite conductors.(b) Compression-Weld JointsCompression-weld joints differ fromweld-annealed joints i
47、n that the wire is not annealed after the butt-weldingoperation, but is reinforced with a hard-drawn, seamless, silicon-tinbronze sleeve which is applied by means of a hydraulic compressor overthe weld. This sleeve is covered with solder so as to completely seal theends. These sleeves have a wall th
48、ickness of 25 to 50 % of the radius ofthe wire, depending on wire size. Their use is usually limited to 3-wireconductors where the relatively large diameter is not objectionablealthough they may be used also in Type F conductors. This joint developsthe full strength of the wire.NOTE 2For definitions
49、 of terms relating to conductors, referenceshould be made to (1) ANSI C42.35- latest revision and (2) TerminologyB354.NOTE 3To test stranded conductors for tensile strength successfully asa unit requires an adequate means of gripping the ends of the testspecimen. Various means are available, such as a long tube or socket intowhich the conductor may be soldered, or in which, after insertion, theTABLE 1 ContinuedConductor Size, Hard-Drawn CopperEquivalentATypeGrade 30 EHS Copper-Clad Steel WiresHard-Drawn CopperWiresRated BreakingStrength, min,lbBcmi
