1、Designation: B258 14B258 18Standard Specification forStandard Nominal Diameters and Cross-Sectional Areas ofAWG Sizes of Solid Round Wires Used as ElectricalConductors1This standard is issued under the fixed designation B258; the number immediately following the designation indicates the year oforig
2、inal adoption or, in the case of 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.This standard has been approved for use by agencies of the U.S. Department
3、of Defense.1. Scope1.1 This specification prescribes standard nominal diameters and cross-sectional areas of American Wire Gage (AWG) sizes ofsolid round wires, used as electrical conductors, and gives equations and rules for the calculation of standard nominal mass andlengths, resistances, and brea
4、king strengths of such wires (Explanatory Note 1).1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. Each system shall be usedindependently of the other. Combining values of the two systems may result in nonconformance with the specification. Forconductor size
5、s designated by AWG or kcmil sizes, the requirements in SI units have been numerically converted from thecorresponding values stated or derived, in inch-pound units. For conductor sizes designated by SI units only, the requirements arestated or derived in SI units.1.2.1 For density, resistivity and
6、temperature, the values stated in SI units are to be regarded as standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Reco
7、mmendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A111 Specification for Zinc-Coated (Galvanized) “Iron” Telephone and Telegraph Line WireA326 Specification for Zinc-Coated (Galvanized) High Tensile Steel Telephon
8、e and Telegraph Line Wire (Withdrawn 1990)3B1 Specification for Hard-Drawn Copper WireB2 Specification for Medium-Hard-Drawn Copper WireB3 Specification for Soft or Annealed Copper WireB9 Specification for Bronze Trolley WireB33 Specification for Tin-Coated Soft or Annealed Copper Wire for Electrica
9、l PurposesB47 Specification for Copper Trolley WireB105 Specification for Hard-Drawn Copper Alloy Wires for Electric ConductorsB189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical PurposesB193 Test Method for Resistivity of Electrical Conductor MaterialsB227 Speci
10、fication for Hard-Drawn Copper-Clad Steel WireB230/B230M Specification for Aluminum 1350H19 Wire for Electrical PurposesB314 Specification for Aluminum 1350 Wire for Communication Cable (Withdrawn 1994)3B396 Specification for Aluminum-Alloy 5005-H19 Wire for Electrical Purposes (Withdrawn 2003)3B398
11、/B398M Specification for Aluminum-Alloy 6201-T81 and 6201-T83 Wire for Electrical PurposesB415 Specification for Hard-Drawn Aluminum-Clad Steel Wire1 This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.02 on
12、 Methods ofTest and Sampling Procedure.Current edition approved April 1, 2014Oct. 1, 2018. Published April 2014October 2018. Originally approved in 1951. Last previous edition approved in 20082014 asB258 02 (2008).B258 14. DOI: 10.1520/B0258-14.10.1520/B0258-18.2 For referencedASTM standards, visit
13、theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.This
14、 document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior edition
15、s as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1B498/B498M Specification for Zinc-Coated (Galvanized
16、) Steel Core Wire for Use in Overhead Electrical ConductorsB502 Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum ConductorsB606 Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-AlloyConductors, Steel ReinforcedB
17、609/B609M Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical PurposesB800 Specification for 8000 Series Aluminum Alloy Wire for Electrical PurposesAnnealed and Intermediate TempersB802 Specification for Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Core Wi
18、re for Aluminum Conductors, SteelReinforced (ACSR)Metric(Discontinued 1998-Replaced by B 802/B802M) B0802_B0802MB803 Specification for High-Strength Zinc5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in OverheadElectrical ConductorsB957 Specification for Extra-High-Strength and Ultra-H
19、igh-Strength Zinc-Coated (Galvanized) Steel Core Wire for OverheadElectrical ConductorsB958 Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc5% Aluminum-Mischmetal Alloy-CoatedSteel Core Wire for Use in Overhead Electrical ConductorsE29 Practice for Using Significant Digits
20、in Test Data to Determine Conformance with SpecificationsF205 Test Method for Measuring Diameter of Fine Wire by Weighing3. Standard Reference Temperature3.1 For the purpose of this specification, all wire dimensions and properties shall be considered as occurring at theinternationally standardized
21、reference temperature of 20C (68F).4. Standard Rules for Rounding4.1 All calculations for the standard nominal dimensions and properties of solid round wires shall be rounded in the final valueonly, in accordance with rounding method of Practice E29.5. Standard Nominal Diameters5.1 Standard nominal
22、diameters of AWG sizes of solid round wires shall be calculated in accordance with the conventionalmathematical law of the American Wire Gage (see Explanatory Note 1) and in accordance with Section 4.5.2 For wire sizes 4/0 to 44 AWG, inclusive, 10 AWG, inclusive, expressed in mil units, and for wire
23、 sizes 4/0 to 18 AWG,inclusive, expressed in millimetre units, nominal diameters shall be expressed in no more than four significant figures but in nocase closer than the nearest 0.1 mil (0.0001 in.).figures.5.3 For wire sizes 45 to 56 AWG, inclusive, 11 AWG and smaller, expressed in mil units, and
24、for wire sizes in 19 AWG andsmaller expressed in millimetre units, nominal diameters shall be expressed to the nearest 0.01 mil (0.00001 in.).in no more thanthree significant figures.5.4 The standard nominal diameters expressed in mils and mm have been calculated in accordance with these rules and a
25、re givenin Table 1 for convenient reference (Explanatory Note 2). The standard nominal diameters expressed in mm have been calculatedbased on the indicated mil diameter value 0.0254.6. Standard Nominal Cross-Sectional Areas6.1 Standard nominal cross-sectional areas in circular mils and square millim
26、etres shall be calculated in accordance with thefollowing equations and shall be rounded in accordance with Section 4 to the same number of significant figures as used inexpressing the standard diameters, but in no case to less than three significant figures:diameters:Area,cmil5d2Area,mm25d235.06731
27、024where:d = diameter of the wire in mils as given in Table 1.Standard nominal cross-sectional areas in circular mils and square millimetres have been calculated in accordance with theforegoing rules and are given in Table 1 for convenient reference.6.2 Standard nominal cross-sectional areas in circ
28、ular mils and square millimetres have been calculated in accordance with theforegoing rules and are given in Table 1 for convenient reference.7. Rules for Calculations Involving Mass and Length7.1 Standard nominal mass and lengths shall be calculated from the standard wire diameters specified in Tab
29、le 1, in accordancewith the following equations. They shall be rounded in the final value only, in accordance with Section 4, to the same number ofsignificant figures as used in expressing the standard diameters, but in no case to less than three significant figures:B258 182W 5d 2330.3404931023L 51/
30、d 2!31/!32.93693106where:W = mass, lb/1000 ft,d = diameter of the wire in mils as given in Table 1, = density of the wire material at 20C in g/cm3 as given in Table 2, andL = length, ft/lb.8. Rules for Calculations Involving Resistivity8.1 Standard nominal resistances and other values derived from t
31、he resistivity units shall be calculated from the standard wirediameters specified in Table 1 in accordance with the following equations.All values so derived shall be rounded in the final valueTABLE 1 Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires at 20CSize
32、Diameter Cross-Sectional Area Size Diameter Cross-Sectional AreaAWG mils mm cmils mm2 AWG mils mm cmils mm24/0 460.0 11.684 211 600 107.2 29 11.3 0.287 128 0.06474/0 460.0 11.68 211 600 107.2 29 11.3 0.287 128 0.06473/0 409.6 10.404 167 800 85.0 30 10.0 0.254 100 0.05073/0 409.6 10.40 167 800 85.01
33、30 10.0 0.254 100 0.05072/0 364.8 9.26 133 100 67.4 31 8.9 0.226 79.2 0.04012/0 364.8 9.266 133 100 67.43 31 8.90 0.226 79.2 0.04011/0 324.9 8.25 105 600 53.5 32 8.0 0.203 64.0 0.03241/0 324.9 8.252 105 600 53.49 32 8.00 0.203 64.0 0.03241 289.3 7.35 83 690 42.4 33 7.1 0.180 50.4 0.02551 289.3 7.348
34、 83 690 42.41 33 7.10 0.180 50.4 0.02552 257.6 6.54 66 360 33.6 34 6.3 0.160 39.7 0.02012 257.6 6.543 66 360 33.62 34 6.30 0.160 39.7 0.02013 229.4 5.82 52 620 26.7 35 5.6 0.142 31.4 0.01593 229.4 5.827 52 620 26.66 35 5.60 0.142 31.4 0.01594 204.3 5.19 41 740 21.1 36 5.0 0.127 25.0 0.01274 204.3 5.
35、189 41 740 21.15 36 5.00 0.127 25.0 0.01275 181.9 4.62 33 090 16.8 37 4.5 0.114 20.2 0.01035 181.9 4.620 33 090 16.77 37 4.50 0.114 20.2 0.01036 162.0 4.11 26 240 13.3 38 4.0 0.102 16.0 0.008116 162.0 4.115 26 240 13.30 38 4.00 0.102 16.0 0.008117 144.3 3.67 20 820 10.6 39 3.5 0.0890 12.2 0.006217 1
36、44.3 3.665 20 820 10.55 39 3.50 0.0889 12.2 0.006218 128.5 3.26 16 510 8.37 40 3.1 0.0787 9.61 0.004878 128.5 3.264 16 510 8.367 40 3.10 0.0787 9.61 0.004879 114.4 2.91 13 090 6.63 41 2.8 0.0711 7.84 0.003979 114.4 2.906 13 090 6.631 41 2.80 0.0711 7.84 0.0039710 101.9 2.59 10 380 5.26 42 2.5 0.0635
37、 6.25 0.0031710 101.9 2.588 10 380 5.261 42 2.50 0.0635 6.25 0.0031711 90.7 2.30 8 230 4.17 43 2.2 0.0559 4.84 0.0024511 90.7 2.304 8 230 4.168 43 2.20 0.0559 4.84 0.0024512 80.8 2.05 6 530 3.31 44 2.0 0.0508 4.00 0.0020312 80.8 2.052 6 530 3.308 44 2.00 0.0508 4.00 0.0020313 72.0 1.83 5 180 2.63 45
38、 1.76 0.0447 3.10 0.0015713 72.0 1.829 5 180 2.627 45 1.76 0.0447 3.10 0.0015714 64.1 1.63 4 110 2.08 46 1.57 0.0399 2.46 0.0012514 64.1 1.628 4 110 2.082 46 1.57 0.0399 2.46 0.0012515 57.1 1.45 3 260 1.65 47 1.40 0.0356 1.96 0.00099315 57.1 1.450 3 260 1.652 47 1.40 0.0356 1.96 0.00099316 50.8 1.29
39、 2 580 1.31 48 1.24 0.0315 1.54 0.00077916 50.8 1.290 2 580 1.308 48 1.24 0.0315 1.54 0.00077917 45.3 1.15 2 050 1.04 49 1.11 0.0282 1.23 0.00062417 45.3 1.151 2 050 1.040 49 1.11 0.0282 1.23 0.00062418 40.3 1.02 1 620 0.823 50 0.99 0.0252 0.980 0.00049718 40.3 1.024 1 620 0.823 50 0.99 0.0252 0.980
40、 0.00049719 35.9 0.904 1 290 0.653 51 0.88 0.0224 0.774 0.00039219 35.9 0.912 1 290 0.653 51 0.88 0.0224 0.774 0.00039220 32.0 0.813 1 020 0.519 52 0.78 0.0198 0.608 0.00030821 28.5 0.724 812 0.412 53 0.70 0.0178 0.490 0.00024822 25.3 0.643 640 0.324 54 0.62 0.0158 0.384 0.00019522 25.3 0.643 640 0.
41、324 54 0.62 0.0157 0.384 0.00019523 22.6 0.574 511 0.259 55 0.55 0.0140 0.302 0.00015324 20.1 0.511 404 0.205 56 0.49 0.0125 0.240 0.00012224 20.1 0.511 404 0.205 56 0.49 0.0124 0.240 0.00012225 17.9 0.455 320 0.16226 15.9 0.404 253 0.12827 14.2 0.361 202 0.10228 12.6 0.320 159 0.0804B258 183TABLE 2
42、 Density and Resistivity of Electrical Conductor MaterialsMaterial Density, , at20C, g/cm3 ResistivityA , , at20C, lb/mile2 Material Density, at20C, g/cm3 Resistivity, , at20C lb/mile2Material Density, , at20C, g/cm3 ResistivityA , , at20C, lb/mile2 Material Density, at20C, g/cm3 Resistivity, , at20
43、C lb/mile2Copper (Specifications B1, B2, Aluminum-Clad Steel (Specification 6.59 3191Copper (SpecificationsB3, B33, B47 and B189),Aluminum-Clad Steel (SpecificationsB415 and B502)6.59 3191Volume Conductivity, %IACS:Copper-Clad Steel (SpecificationB227):100 8.89 875.20 Grade 30 HS 8.15 272897.66 8.89
44、 896.15 Grade 30 HS 8.15 272897.66 8.89 896.15 Grade 30 EHS 8.15 272897.16 8.89 900.77 Grade 30 EHS 8.15 272897.16 8.89 900.77 Grade 40 8.15 204596.66 8.89 905.44 Grade 40 EHS 8.15 204596.16 8.89 910.15 Grade 40 EHS 8.15 204594.16 8.89 929.52 Galvanized Steel (Telephone and96.16 8.89 910.15 Galvaniz
45、ed Steel (Telephone and94.16 8.89 929.52 Telegraph) (Specification A111):93.15 8.89 939.51 Telegraph) (Specification93.15 8.89 939.51 Class A Coating:Bronze (Specification B9): A111):Bronze (Specification B9): Grade EBB (Non-Copper 7.78 5000Class A 8.89 2188 Class A Coating:Class B 8.89 1346 Grade E
46、BB (Non-Copper 7.78 5000Class C 8.89 1094 Bearing)Class A 8.89 2188 Bearing)Copper Alloys (Specification Grade BB (Copper Bearing) 7.78 5800Class B 8.89 1346 Grade BB (Copper Bearing) 7.78 5800B105B ): Grade BB (Non-Copper 7.78 5600Class C 8.89 1094 Grade BB (Non-Copper 7.78 5600Copper Alloys (Speci
47、fication B105B ): Bearing)Grade 8.5 8.78 10 169 Bearing)Grade 8.5 8.78 10 169 Class B Coating:Grade 13 8.78 6649 Class B Coating:Grade 15 8.54 5605 Grade EBB (Non-Copper 7.78 4900Grade 13 8.78 6649 Grade EBB (Non-Copper 7.78 4900Grade 20 8.89 4376 Bearing)Grade 15 8.54 5605 Bearing)Grade 30 8.89 291
48、7 Grade BB (Copper Bearing) 7.78 5600Grade 20 8.89 4376 Grade BB (Copper Bearing) 7.78 5600Grade 40 8.89 2188 Grade BB (Non-Copper 7.78 5450Grade 30 8.89 2917 Grade BB (Non-Copper 7.78 5450Grade 55 8.89 1591 Bearing)Grade 40 8.89 2188 Bearing)Grade 65 8.89 1346 Class C Coating:Grade 55 8.89 1591 Cla
49、ss C Coating:Grade 74 8.89 1183 Grade EBB (Non-Copper 7.78 4800Grade 65 8.89 1346 Grade EBB (Non-Copper 7.78 4800Grade 80 8.89 1094 Bearing)Grade 74 8.89 1183 Bearing)Grade 85 8.89 1030 Grade BB (Copper Bearing) 7.78 5400Grade 80 8.89 1094 Grade BB (Copper Bearing) 7.78 5400Aluminum, 1350 (Specifications Grade BB (Non-Copper 7.78 5300Grade 85 8.89 1030 Grade BB (Non-Copper 7.78 5300B230/B230M, B314, andB609/B609M),Bearing)Aluminum, 1350 (SpecificationsB230/B230M, B314, andB609/B609M),Bearing)Volume Conductivity, %IACS:Galvanized
