1、Designation:B68201(Reapproved 2016)Standard Specification forStandard Metric Sizes of Electrical Conductors1This standard is issued under the fixed designation B682;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.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 and prescribes the recom-mended standard metric sizes of solid round electrical conduc-tors.1.2 This spec
3、ification prescribes the recommended standardmetric size designations of stranded electrical conductors(seeExplanatory Note 1).NOTE1Physical properties,construction requirements,and manufac-turing tolerances for specific products should be included in individualproduct specifications developed in ac
4、cordance with appropriate sizes inthis specification.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 Exceptions For conductor sizes designated byAWG or kcmil,the requirements in SI units have beennumerically converted f
5、rom corresponding values,stated orderived,in inch-pound units.For conductor sizes designated bySI units only,the requirements are stated or derived in SI units.Rounded values appear in Table 1.2.Referenced Documents2.1 ASTM Standards:2E29 Practice for Using Significant Digits in Test Data toDetermin
6、e Conformance with SpecificationsF205 Test Method for Measuring Diameter of Fine Wire byWeighing2.2 IEC Standards:IEC 182 Basic Dimensions of Winding Wires3IEC 228 Nominal Cross-SectionalAreas and Composition ofConductors of Insulated Cables32.3 ISO Standards:ISO R388 Metric Series for Basic Thickne
7、ss of Sheet andDiameters of Wire33.Standard Reference Temperature3.1 For the purpose of this specification,all wire dimensionsand properties shall be considered as occurring at the interna-tionally standardized reference temperature of 20C.4.Preferred Numbers4.1 The diameters in Table 1 and preferre
8、d cross-sectionalareas in Table 2 are rounded preferred numbers from R(Renard)series in accordance with ISO R388.NOTE2The use of preferred numbers has many advantages and thevalues selected do not vary significantly from the calculated numbers ofthe series used.The preferred and second preference si
9、ze designations,using a Renard series of numbers,provides a schedule of interrelated sizesfor aluminum and copper conductors.NOTE3Should sizes be needed either larger or smaller than thoselisted in Table 1 or Table 2,the respective R series may be expandedupward or downward.5.Standard Rules for Roun
10、ding5.1 All calculations for dimensions and properties,otherthan as provided in Section 4,shall be rounded in the finalvalues only,in accordance with the rounding method ofPractice E29.6.Standard Round-Wire Diameters(Note 2)6.1 The standard diameters of metric sizes of wires arepreferred numbers cal
11、culated in accordance with the conven-tional mathematical principles of an R series of 20 numbersfrom 1 to 10 with multiples and submultiples of 10.6.2 The wire diameters shall be expressed to no more thanthree significant figures plus zeros.6.3 For wire diameters 0.050 mm and over,diameters shallbe
12、 expressed to three decimal places.6.4 For wire diameters less than 0.050 mm,diameters shallbe expressed to four decimal places.6.5 The standard diameters expressed in millimetres inaccordance with these rules and practices are given in Table 1for convenient reference.NOTE4Solid wires of the listed
13、diameters are used for film coating,1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductorsand is the direct responsibility of Subcommittee B01.02 onMethods of Test and Sampling Procedure.Current edition approved Oct.1,2016.Published October 2016.Originallyapprove
14、d in 1981.Last previous edition approved in 2009 as B682 01(2009)1.DOI:10.1520/B0682-01R16.2For 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
15、 page onthe ASTM website.3International Electrotechnical Commission and International Organization forStandardization documents are available from the American National StandardsInstitute(ANSI),11 West 42nd St.,13th Floor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C7
16、00,West Conshohocken,PA 19428-2959.United States1 TABLE 1 Standard Metric Diameters and Cross-Sectional Areas of Solid Round Wires at 20CDiameterCross-Sectional Areamm(R 20 Series)in.Amm2in.2,AkcmilAcmilA18.00.7087254.50.3944502.216.00.6299201.10.3116396.814.00.5518153.90.2386303.812.50.4921122.70.1902242.211.20.440998.520.1527194.410.00.393778.540.1217155.09.000.354363.620.09861125.68.000.315050.270.0779199.27.100.279539.590.0613778.146.300.248031.170.0483261.525.600.220524.630.0381848.615.000.
