1、Designation: B286 07 (Reapproved 2017)Standard Specification forCopper Conductors for Use in Hookup Wire for ElectronicEquipment1This standard is issued under the fixed designation B286; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specificati
3、on covers uninsulated metallic-coatedcopper conductors for use in hookup wire for electronicequipment.1.2 The SI values for density are to be regarded as standard.For all other properties, the inch-pound values are to beregarded as the standard.1.3 This international standard was developed in accor-
4、dance with internationally recognized principles 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 The f
5、ollowing documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B33 Specification for Tin-Coated Soft or Annealed CopperWire for Electrical PurposesB189 Specification for Lead-Coated and Lead-Alloy-CoatedSoft
6、Copper Wire for Electrical PurposesB193 Test Method for Resistivity of Electrical ConductorMaterialsB258 Specification for Nominal Diameters and Cross-SectionalAreas ofAWG Sizes of Solid Round Wires Usedas Electrical ConductorsB298 Specification for Silver-Coated Soft or Annealed Cop-per WireB355 Sp
7、ecification for Nickel-Coated Soft orAnnealed Cop-per Wire3. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size, designation (Table 1) and type,3.1.2 Conductor size, designation, construction, and type(Table 1).3.1.
8、3 Whether tin, lead alloy, silver-coated, or nickel-coated(see 4.1).3.1.4 For silver-coated conductors and nickel-coatedconductors, class of coating (see 4.1), and when required,unannealed (see 4.2),3.1.5 Desired constructions where alternates are given(Table 1, Type II and, 5.1, 6.1, and 6.2),3.1.6
9、 Package size (Section 12).3.1.7 Special package marking if required (Section 11), and3.1.8 Place of inspection (Section 10).4. General Requirements4.1 Coating of WiresThe coating of the solid conductorsand the wires composing stranded conductors (before strand-ing) shall conform to the coating requ
10、irements of ASTMSpecifications B33, B189, B298, and B355, as indicated on thepurchase order.4.2 TemperUnless otherwise specified, all coated conduc-tors shall be furnished in the annealed temper. When sospecified, silver-coated conductors or nickel-coated conductorsshall be furnished unannealed (Exp
11、lanatory Note 1).NOTE 1The term unannealed as used in this specification meanscold-worked conductor as produced on commercial wire-drawing ma-chines.4.3 ElongationThe elongation of annealed Type I conduc-tors shall be as specified in Specifications B33, B189, B298,and B355 as applicable. The elongat
12、ion of stranded conductorsshall be permitted to vary from the requirements of theapplicable Specifications: B33, B189, B298, and B355 by thefollowing amounts:4.3.1 For stranded conductors 22 AWG and smaller, the testshall be performed on the whole conductor and the elongation1This specification is u
13、nder the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.04 onConductors of Copper and Copper Alloys.Current edition approved May 15, 2017. Published May 2017. Originallyapproved in 1954. Last previous edition approved in 2012 as B286 0
14、7 (2012).DOI: 10.1520/B0286-07R17.2For 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 Internationa
15、l, 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
16、and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1TABLE1DetailsofConductorConstructionTypeI(SolidConductors)SizeDesignation,AWGNominalArea, cmilsNominalDiameter,in.D-CResistanceat20C,/1000ft,max(ExplanatoryNote2)AnnealedTinorLead-AlloyCoatedAnnea
17、ledSilverCoatedClass2NickelAClass10NickelClass27Nickel10103800.10191.061.021.051.171.441265300.08081.691.621.681.842.281441100.06412.682.582.672.933.631625800.05084.264.104.274.655.771816200.04036.786.526.797.399.172010200.032010.710.310.811.814.6226400.025317.216.517.318.823.3244040.020127.226.227.
18、329.836.9262530.015944.541.943.847.558.9281590.012670.866.869.475.4107.0301000.0100114.0106.0110.0120.0149.0TypeII(StrandedConductors)ConductorConstructionD-CResistanceat20C,/1000ft,max(ExplanatoryNote2)SizeDesignationBNumberofWiresCNominalDiameterofEachWire,in.CalculatedCross-SectionalArea,cmilsMax
19、imum AllowableDiameter,in.DLengthofLay,in.(ExplanatoryNote3)AnnealedTinorLead-AlloyCoatedAnnealedSilverCoated50to100in.ofNickelEClass10NickelClass27Nickel000021092109F0.01002109000.635.0.05760.05370.0559(2)0.06100.075600016721672F0.01001672000.545.0.07270.06770.0705(2)0.07700.09540013301330F0.010013
20、30000.486.0.09140.08510.0887(2)0.09670.120010641064F0.01001064000.435.0.1140.1060.111(2)0.1210.150010451045F0.01001045000.431.0.1160.1080.113(2)0.1230.1531836836F0.0100836000.386.0.1450.1350.141(2)0.1540.1911817E817F0.010081700E0.382.0.1490.1390.144(2)0.1580.1952665665F0.0100665000.342.0.1830.1700.1
21、77(2)0.1940.2404133E133F0.017942615E0.274.0.2800.2630.274(2)0.2990.3714420420G0.0100420000.275.0.2890.2700.281(2)0.3060.3806133E133F0.014226818E0.217.0.4440.4180.436(2)0.4750.5896266266G0.0100266000.220.0.4570.4260.443(2)0.4840.6008133E133F0.011316983E0.173.0.7010.6610.688(2)0.7510.9308168168G0.0100
22、168000.177.0.7240.6740.702(2)0.7660.94910105105G1.0100105000.1301.2to1.81.151.071.11(2)1.211.5010104104H0.0100104000.1301.7to2.11.161.081.12(2)1.231.521049E49G0.01429880G0.132.1.211.141.18(2)1.291.601037E37E0.01599354E0.1151.10to1.751.261.191.24(2)1.351.67126565H0.010065000.0991.3to1.71.851.731.80(2
23、)1.962.43TypeII(StrandedConductors)ConductorConstructionD-CResistanceat20C,/1000ft,max(ExplanatoryNote2)SizeDesignationBNumberofWiresCNominalDiameterofEachWire,in.CalculatedCross-SectionalArea,cmilsMaximum AllowableDiameter,in.DLengthofLay,in.(ExplanatoryNote2)AnnealedTinorLead-AlloyCoatedAnnealedSi
24、lverCoated50to100in.ofNickelIClass10NickelClass27Nickel1237E37E0.01265874E0.0910.90to1.452.011.891.97(2)2.152.661219E19J0.01796088E0.0930.90to1.451.921.811.88(2)2.052.55144141H0.010041000.0810.80to1.352.942.742.85(2)3.113.851419E19J0.01423831E0.0730.80to1.153.052.872.99(2)3.264.05162626H0.010026000.
25、0620.60to0.904.594.274.45(2)4.866.021619E19J0.01132426E0.0590.60to0.904.824.544.73(2)5.156.391826E26H0.00801664E0.0500.50to0.707.206.717.14(4)7.639.451819E19J0.01001900E0.0520.50to0.706.225.796.03(2)6.588.16B286 07 (2017)2TABLE1ContinuedTypeII(StrandedConductors)ConductorConstructionD-CResistanceat2
26、0C,/1000ft,max(ExplanatoryNote2)SizeDesignationBNumberofWiresCNominalDiameterofEachWire,in.CalculatedCross-SectionalArea,cmilsMaximum AllowableDiameter,in.DLengthofLay,in.(ExplanatoryNote2)AnnealedTinorLead-AlloyCoatedAnnealedSilverCoated50to100in.ofNickelIClass10NickelClass27Nickel187E7J0.01591770E
27、0.0500.50to0.706.546.166.42(2)7.008.672019E10J0.00801216E0.0420.45to0.559.769.109.68(4)10.312.8201910H0.010010000.0400.45to0.5511.811.011.5(2)12.515.5207E7J0.01261111E0.0390.45to0.5510.49.8110.2(2)11.113.82219E19J0.0063754E0.0330.25to0.4315.914.815.7(4)16.820.8227E7J0.0100700E0.0310.25to0.4316.715.6
28、16.2(2)17.721.92419E19J0.0050475E0.0270.25to0.3525.423.625.2(4)26.933.3247E7J0.0080448E0.0250.25to0.3526.224.526.0(4)27.834.42619E19J0.0040304E0.0220.25to0.3040.137.341.0(7)42.452.6267E7J0.0063278E0.0200.25to0.3042.639.742.2(4)45.155.92819E19J0.0031183E0.0170.25to0.3067.763.169.3(7)71.788.8287E7J0.0
29、050175E0.0160.25to0.3068.263.667.6(4)72.289.5307E7J0.0040112E0.0130.25to0.30108.0100.0110.0(7)114.0141.0327E7J0.003167g0.0110.10to0.30182.0170.0186.0(7)193.0239.0AProvidesminimumof50in.ofnickel.BThesesizedesignationsaresolelyforpurposesofidentification.TheyshouldnotbeconfusedwithAWGsizes.CThestrande
30、dconductorconstructionsshowninthistableprovideforfinishednoninsulatedconductorshavingtheindicatedcross-sectionalarea.Thenumberofcomponentwiresmayvaryslightlyprovidedthespecifiedresistancesarenotexceeded.DThemaximumallowablediametersoftheseconductorsaregivenhereforguidanceinmakingcalculationsregarded
31、insulatingmaterial,etc.Thesediametersdonotincludeallowancefordistortionoftheconductorduringstrandingandarenotintendedtobeusedaslimitingvalues.EThecross-sectionalareasoftheseconductor-sizedesignationsdeviatebymorethan2percentfromthenominalareasofthestandardAWGsizesasdefinedinSpecificationB258.FNinete
32、enmemberropes.GSevenmemberropes.HBunch-stranded.IThenumbersinparenthesesindicatetheclassofnickelcoatingrequiredtomeetresistancevaluestabulated.TheseclassesappearinSpecificationB355.JConcentric-stranded.Editoriallycorrected.B286 07 (2017)3measured when the first strand of the conductor breaks. Themin
33、imum average elongation shall not be less than 10 % withno individual specimen less than 5 %.4.3.2 For stranded conductors larger than 22 AWG, strandsshall be carefully removed from the conductor and tested forelongation. The minimum average elongation shall not be lessthan 10 % with no individual s
34、trand less than 5 %.4.4 D-C ResistanceThe d-c resistance in ohms per 1000 ftof annealed solid and stranded conductor shall not exceed,before insulating, the appropriate values prescribed in Table 1(Explanatory Note 2).5. Conductor Construction5.1 Solid conductors shall conform to the requirements fo
35、rType I conductors prescribed in Table 1.5.2 Stranded conductors shall conform to the requirementsfor Type II conductors prescribed in Table 1. The method ofstranding for conductor size designations 32-7 through 10-104inclusive shall be at the option of the manufacturer unlessotherwise specified. St
36、randed conductors size designation 10-105 and larger shall normally be furnished in a rope-lay-stranded construction consisting of either 7 or 19 bunch-stranded members.6. Lay of Stranded Conductors6.1 The direction of lay of the outside layer of strandedconductors shall be left-hand. The direction
37、of lay of thebunch-stranded members composing rope-lay-stranded con-ductors shall be at the option of the manufacturer unlessotherwise specified.6.2 The direction of lay of the outer layer of rope-lay-stranded conductors shall be lefthand. The direction of lay ofthe other layers shall be reversed in
38、 successive layers, unlessotherwise specified.6.3 The length of lay of the outside layer of strandedconductors in size designation 32-7 through 10-104, inclusive,shall conform to the values in Table 1 (Explanatory Note 3).For strand constructions containing more than one distinctlayer the length of
39、lay of the inner layer shall not exceed themaximum value shown in Table 1 for the conductor inquestion. For rope-lay-stranded conductors size designation10-105 and larger, and size 49/0.0142, the length of lay of thewires composing the bunch-stranded members shall be notmore than 30 times the diamet
40、er of the member, and the lengthof lay of the outer layer of rope-lay-stranded conductors shallbe not less than 8 nor more than 16 times the outside diameterof the completed conductor.7. Joints7.1 Necessary joints in the individual wires of conductorssize designation 32-7 through size designation 10
41、-104,inclusive, may be silver soldered, brazed, or butt welded.(Explanatory Note 4). Bunch-stranded members composingropelay-stranded conductors may be joined as a unit by brazingand these joints shall be at least two lay lengths apart and befinished off so that the conductor diameter is not increas
42、ed atthe joint. Disposition of joints throughout the conductor shallbe such that the diameter, configuration, conductor resistance,flexibility, and mechanical strength are not substantially af-fected.8. Physical and Electrical Tests8.1 Tests to determine conformance of the coating to therequirements
43、 of Specifications B33, B189, B298,orB355 shallbe performed on Type I conductors before insulating and on theindividual wires of Type II conductors before stranding.8.2 Tests to determine conformance to the elongation re-quirements prescribed in 4.3 shall be made before insulating.8.3 Tests to deter
44、mine conformance to the electrical resis-tance requirements prescribed in Table 1 shall be made on theuninsulated conductor in accordance with Test Method B193(Explanatory Note 2).8.4 Examination for Workmanship of Finished UninsulatedStranded ConductorAvisual inspection with the unaided eyeshall be
45、 performed on the outer layer of the conductor on thesupplied package. Use a white card (as a background) toascertain if any base metal is exposed through a break in thecoating. Detection of any base metal constitutes rejection.8.5 Examination for Workmanship of Finished UninsulatedStranded Conducto
46、rA visual inspection with 10X magnifi-cation and with a white background shall be performed on aconductor sample taken from the top of the supplied spool. Thesample shall be a minimum of 12 in. (30 cm) in length. Theouter surface of all stranded constructions shall be examined.Detection of excessive
47、 exposed base metal due to thestranding process, such as indications along one side of thesample due to excessive localized abrasion during stranding,constitutes rejection. Continuous lines or patterns of exposedbase metals constitute rejection. Small random point failuresshall not be cause for reje
48、ction.9. Density9.1 For the purpose of calculating mass, cross-sectionalarea, etc., the density of the coated copper shall be taken as8.89 g/cm3(0.32117 lb/in.3) at 20C (Explanatory Note 5).10. Inspection10.1 All tests and inspection shall be made at the place ofmanufacture unless otherwise especial
49、ly agreed upon by themanufacturer and the purchaser at the time of purchase. Themanufacturer shall afford the inspector representing the pur-chaser all reasonable facilities, without charge, to satisfy himthat the material is being furnished in accordance with thisspecification.11. Product Marking11.1 The net mass, length (or lengths, and number oflengths, if more than one length is included in the package),size designation, type of conductor, purchase order number,and any other marks required by the purchase order sha
