1、Designation: B 258 02Standard Specification forStandard Nominal Diameters and Cross-Sectional Areas ofAWG Sizes of Solid Round Wires Used as ElectricalConductors1This standard is issued under the fixed designation B 258; the number immediately following the designation indicates the year oforiginal
2、adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defens
3、e.1. Scope1.1 This specification prescribes standard nominal diam-eters and cross-sectional areas of American Wire Gage (AWG)sizes of solid round wires, used as electrical conductors, andgives equations and rules for the calculation of standardnominal mass and lengths, resistances, and breaking stre
4、ngthsof such wires (Explanatory Note 1).1.2 The values stated in inch-pound or SI units are to beregarded separately as standard. Each system shall be usedindependently of the other. Combining values of the twosystems may result in nonconformance with the specification.For conductor sizes designated
5、 by AWG or kcmil sizes, therequirements in SI units have been numerically converted fromthe corresponding values stated or derived, in inch-pound units.For conductor sizes designated by SI units only, the require-ments are stated or derived in SI units.1.2.1 For density, resistivity and temperature,
6、 the valuesstated in SI units are to be regarded as standard.2. Referenced Documents2.1 ASTM Standards:A 111 Specification for Zinc-Coated (Galvanized) “Iron”Telephone and Telegraph Line Wire2A 326 Specification for Zinc-Coated (Galvanized) HighTensile Steel Telephone and Telegraph Line Wire3B 1 Spe
7、cification for Hard-Drawn Copper Wire4B 2 Specification for Medium-Hard-Drawn Copper Wire4B 3 Specification for Soft or Annealed Copper Wire4B 9 Specification for Bronze Trolley Wire4B 33 Specification for Tinned Soft or Annealed CopperWire for Electrical Purposes4B 47 Specification for Copper Troll
8、ey Wire4B 105 Specification for Hard-Drawn Copper Alloy Wiresfor Electrical Conductors4B 189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes4B 193 Test Method for Resistivity of Electrical ConductorMaterialsB 227 Specification for Hard-Drawn Copper-Clad S
9、teelWire4B 230/B 230M Specification for Aluminum 1350-H19 Wirefor Electrical Purposes4B 314 Specification for Aluminum 1350 Wire for Commu-nication Cable5B 396 Specification for Aluminum-Alloy 5005-H19 Wirefor Electrical Purposes4B 398/B 398M Specification for Aluminum-Alloy 6201-T81 Wire for Electr
10、ical Purposes4B 415 Specification for Hard-Drawn Aluminum-Clad SteelWire4B 609/B 609M Specification for Aluminum 1350 RoundWire, Annealed and Intermediate Tempers, for ElectricalPurposes4B 800 Specification for 8000 Series Aluminum Alloy Wirefor Electrical PurposesAnnealed and Intermediate Tem-pers4
11、E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications6F 205 Test Method for Measuring Diameter of Fine Wire byWeighing71This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcomm
12、ittee B01.02 onMethods of Test and Sampling Procedure.Current edition approved April 10, 2002. Published June 2002. Originallypublished as B 258 51 T. Last previous edition B 258 01.2Annual Book of ASTM Standards, Vol 01.06.3Discontinued, see 1990 Annual Book of ASTM Standards, Vol 01.06.4Annual Boo
13、k of ASTM Standards, Vol 02.03.5Discontinued, see 1994 Annual Book of ASTM Standards, Vol 02.03.6Annual Book of ASTM Standards, Vol 14.02.7Annual Book of ASTM Standards, Vol 10.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3. St
14、andard 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 (68F).4. Standard Rules for Rounding4.1 All calculations for the standard nominal dimensionsand
15、properties of solid round wires shall be rounded in the finalvalue only, in accordance with rounding method of PracticeE 29.5. Standard Nominal Diameters5.1 Standard nominal diameters of AWG sizes of solidround wires shall be calculated in accordance with the conven-tional mathematical law of the Am
16、erican Wire Gage (seeExplanatory Note 1) and in accordance with Section 4.5.2 For wire sizes 4/0 to 44 AWG, inclusive, nominaldiameters shall be expressed in no more than four significantfigures but in no case closer than the nearest 0.1 mil (0.0001in.).5.3 For wire sizes 45 to 56 AWG, inclusive, no
17、minaldiameters shall be expressed to the nearest 0.01 mil (0.00001in.).5.4 The standard nominal diameters expressed in mils havebeen calculated in accordance with these rules and are given inTable 1 for convenient reference (Explanatory Note 2).6. Standard Nominal Cross-Sectional Areas6.1 Standard n
18、ominal cross-sectional areas in circular milsand square millimetres shall be calculated in accordance withthe following equations and shall be rounded in accordancewith Section 4 to the same number of significant figures as usedin expressing the standard diameters, but in no case to less thanthree s
19、ignificant figures:Area, cmil 5 d2Area, mm25 d23 5.067 3 1024where:d = diameter of the wire in mils as given in Table 1.Standard nominal cross-sectional areas in circular mils andsquare millimetres have been calculated in accordance with theforegoing rules and are given in Table 1 for convenientrefe
20、rence.7. Rules for Calculations Involving Mass and Length7.1 Standard nominal mass and lengths shall be calculatedfrom the standard wire diameters specified in Table 1, inaccordance with the following equations. They shall berounded in the final value only, in accordance with Section 4,to the same n
21、umber of significant figures as used in expressingthe standard diameters, but in no case to less than threesignificant figures:W 5 d23d30.34049 3 1023L 5 1/d2! 3 1/d! 3 2.9369 3 106where:W = mass, lb/1000 ft,d = diameter of the wire in mils as given in Table 1,TABLE 1 Standard Nominal Diameters and
22、Cross-Sectional Areas of AWG Sizes of Solid Round Wires at 20CSize Diameter Cross-Sectional Area Size Diameter Cross-Sectional AreaAWG mils mm cmils mm2AWG mils mm cmils mm24/0 460.0 11.684 211 600 107.2 29 11.3 0.287 128 0.06473/0 409.6 10.404 167 800 85.0 30 10.0 0.254 100 0.05072/0 364.8 9.26 133
23、 100 67.4 31 8.9 0.226 79.2 0.04011/0 324.9 8.25 105 600 53.5 32 8.0 0.203 64.0 0.03241 289.3 7.35 83 690 42.4 33 7.1 0.180 50.4 0.02552 257.6 6.54 66 360 33.6 34 6.3 0.160 39.7 0.02013 229.4 5.82 52 620 26.7 35 5.6 0.142 31.4 0.01594 204.3 5.19 41 740 21.1 36 5.0 0.127 25.0 0.01275 181.9 4.62 33 09
24、0 16.8 37 4.5 0.114 20.2 0.01036 162.0 4.11 26 240 13.3 38 4.0 0.102 16.0 0.008117 144.3 3.67 20 820 10.6 39 3.5 0.0890 12.2 0.006218 128.5 3.26 16 510 8.37 40 3.1 0.0787 9.61 0.004879 114.4 2.91 13 090 6.63 41 2.8 0.0711 7.84 0.0039710 101.9 2.59 10 380 5.26 42 2.5 0.0635 6.25 0.0031711 90.7 2.30 8
25、 230 4.17 43 2.2 0.0559 4.84 0.0024512 80.8 2.05 6 530 3.31 44 2.0 0.0508 4.00 0.0020313 72.0 1.83 5 180 2.63 45 1.76 0.0447 3.10 0.0015714 64.1 1.63 4 110 2.08 46 1.57 0.0399 2.46 0.0012515 57.1 1.45 3 260 1.65 47 1.40 0.0356 1.96 0.00099316 50.8 1.29 2 580 1.31 48 1.24 0.0315 1.54 0.00077917 45.3
26、1.15 2 050 1.04 49 1.11 0.0282 1.23 0.00062418 40.3 1.02 1 620 0.823 50 0.99 0.0252 0.980 0.00049719 35.9 0.904 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
27、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 0.00012225 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 0.0804B258022d = density of the wire material at 20C in g/cm3as givenin Table 2, andL = lengt
28、h, ft/lb.8. Rules for Calculations Involving Resistivity8.1 Standard nominal resistances and other values derivedfrom the resistivity units shall be calculated from the standardwire diameters specified in Table 1 in accordance with thefollowing equations. All values so derived shall be rounded inthe
29、 final value only, in accordance with Section 4, to the samenumber of significant figures as used in expressing the standarddiameters, but in no case to less than three significant figures:D2c resistance at 20C, V/1000 ft 5 r/d23d!# 3 105.35D2c resistance at 20C, V/lb 5 r/d23 d4!# 3 0.30940 3 106Len
30、gth at 20C, ft/V5d23d!/r 3 9.4924Mass at 20C, lb/V5d23 d4!/r 3 3.2321 3 1026where:d = diameter of the wire in mils as given in Table 1,r = resistivity of the wire material at 20C in Vlb/mile2asgiven in Table 2 (Explanatory Note 3), andd = density of the wire material at 20C in g/cm3as givenin Table
31、2.9. Rules for Calculating Rated Strength9.1 Standard rated strengths shall be calculated from thestandard wire diameters specified in Table 1 in accordance withTABLE 2 Density and Resistivity of Electrical Conductor MaterialsMaterialDensity, d,at20C, g/cm3ResistivityA, r,at20C, V lb/mile2MaterialDe
32、nsity,d,at20C, g/cm3Resistivity, r,at20C V lb/mile2Copper (Specifications B 1, B 2, B Aluminum-Clad Steel (Specification 6.59 31913, B 33, B 47 and B 189), B 415)Volume Conductivity, %IACS:Copper-Clad Steel (SpecificationB 227):100 8.89 875.2097.66 8.89 896.15 Grade 30 HS 8.15 272897.16 8.89 900.77
33、Grade 30 EHS 8.15 272896.66 8.89 905.44 Grade 40 8.15 204596.16 8.89 910.15 Grade 40 EHS 8.15 204594.16 8.89 929.52 Galvanized Steel (Telephone and93.15 8.89 939.51 Telegraph) (Specification ABronze (Specification B 9): 111):Class A 8.89 2188 Class A Coating:Class B 8.89 1346 Grade EBB (Non-Copper 7
34、.78 5000Class C 8.89 1094 Bearing)Copper Alloys (Specification B Grade BB (Copper Bearing) 7.78 5800105B): Grade BB (Non-Copper 7.78 5600Grade 8.5 8.78 10 169 Bearing)Grade 13 8.78 6649 Class B Coating:Grade 15 8.54 5605 Grade EBB (Non-Copper 7.78 4900Grade 20 8.89 4376 Bearing)Grade 30 8.89 2917 Gr
35、ade BB (Copper Bearing) 7.78 5600Grade 40 8.89 2188 Grade BB (Non-Copper 7.78 5450Grade 55 8.89 1591 Bearing)Grade 65 8.89 1346 Class C Coating:Grade 74 8.89 1183 Grade EBB (Non-Copper 7.78 4800Grade 80 8.89 1094 Bearing)Grade 85 8.89 1030 Grade BB (Copper Bearing) 7.78 5400Aluminum, 1350 (Specifica
36、tions B Grade BB (Non-Copper 7.78 5300230/B 230M, B 314, andB 609/B 609M),Bearing)Volume Conductivity, %IACS:Galvanized Steel (Telephone andTelegraph) (SpecificationA 326):61.8 2.705 430.9161.2 2.705 435.1361.0 2.705 436.56 Class A Coating:Aluminum Alloys (Specifications B Grade 85 7.83 5800396 and
37、B 398/B 398M) Class B Coating:Alloy 5005H19 2.70 496.84 Grade 135 7.83 6500Alloy 6201T81 2.69 504.43 Grade 85 7.80 5600Aluminum Alloy 8000 Series Grade 135 7.80 6300(Specification B 800) Class C Coating:Volume Conductivity, %IACS:Grade 85 7.77 540061.0 2.71 437.36 Grade 135 7.77 6100ATo convert from
38、 Vlb/mile2to Vg/m2multiply by 5710.0. See Table 1 in Test Method B 193.BVarious compositions are permitted for some of the grades in Specification B 105 and the density value may not apply to all materials supplied to this specification.In case of doubt, the density value should be determined or obt
39、ained from the manufacturer.B258023the following equation and shall be rounded in the final valueonly, 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:Rated strength, lb 5 d23 T
40、3 0.7854 3 1026where:d = diameter of the wire in mils as given in Table 1, andT = tensile strength, psi, applicable to the wire material,temper, and size, for which reference should be madeto the specifications which cover the material.10. Tolerances10.1 The standard dimensions given in Table 1 and
41、thecalculated values for mass, resistances, and rated strengthsobtained by the use of the formulas included in this specifica-tion are all nominal values. This specification is not concernedwith quantitative values of tolerances per se, but it is contem-plated that the standard nominal wire dimensio
42、ns specified inTable 1, and the properties derived therefrom, shall be madesubject to tolerances as indicated in either the individualspecifications applicable to the wires of various materials andtempers or as may be mutually agreed by the manufacturer andthe purchaser.EXPLANATORY NOTESNOTE 1Except
43、 for certain classes of wire products, the AmericanWire Gage (formerly known as the Brown or through the ASTM website(www.astm.org).8NBS Handbook 100, Nat. Institute of Standards and Technology, , is sold by theNational Technical Information Service, 5285 Port Royal Road, Springfield, VA22161.B258025
