Designation:B258–02
Standard Specification for
Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Ud as Electrical Conductors1
This standard is issued under thefixed designation B258;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
This standard has been approved for u by agencies of the Department of Defen.
1.Scope
1.1This specification prescribes standard nominal diam-eters and cross-ctional areas of American Wire Gage(AWG) sizes of solid round wires,ud as electrical conductors,and gives equations and rules for the calculation of standard nominal mass and lengths,resistances,and breaking strengths of such wires(Explanatory Note1).
1.2The values stated in inch-pound or SI units are to be regarded parately as standard.Each system shall be ud independently of the other.Combining values of the two systems may result in nonconformance with the specification. For conductor sizes designated by AWG or kcmil sizes,the requirements in SI units have been numerically converted from the 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.
1.2.1For density,resistivity and temperature,the values stated in SI units are to be regarded as standard.
2.Referenced Documents
2.1ASTM Standards:
A111Specification for Zinc-Coated(Galvanized)“Iron”
Telephone and Telegraph Line Wire2
A326Specification for Zinc-Coated(Galvanized)High Tensile Steel Telephone and Telegraph Line Wire3
B1Specification for Hard-Drawn Copper Wire4
B2Specification for Medium-Hard-Drawn Copper Wire4 B3Specification for Soft or Annealed Copper Wire4
B9Specification for Bronze Trolley Wire4B33Specification for Tinned Soft or Annealed Copper Wire for Electrical Purpos4
B47Specification for Copper Trolley Wire4
B105Specification for Hard-Drawn Copper Alloy Wires for Electrical Conductors4
B189Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purpos4
B193Test Method for Resistivity of Electrical Conductor Materials
B227Specification for Hard-Drawn Copper-Clad Steel Wire4
B230/B230M Specification for Aluminum1350-H19Wire for Electrical Purpos4
B314Specification for Aluminum1350Wire for Commu-nication Cable5
B396Specification for Aluminum-Alloy5005-H19Wire for Electrical Purpos4
B398/B398M Specification for Aluminum-Alloy6201-T81Wire for Electrical Purpos4
B415Specification for Hard-Drawn Aluminum-Clad Steel Wire4
B609/B609M Specification for Aluminum1350Round Wire,Annealed and Intermediate Tempers,for Electrical Purpos4中级口译教程
B800Specification for8000Series Aluminum Alloy Wire for Electrical Purpos—Annealed and Intermediate Tem-pers4
E29Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications6
F205Test Method for Measuring Diameter of Fine Wire by Weighing7
1This specification is under the jurisdiction of ASTM Committee B01on Electrical Conductors and is the direct responsibility of Subcommittee B01.02on Methods of Test and Sampling Procedure.
Current edition approved April10,2002.Published June2002.Originally published as B258–51T.Last previous edition B258–01.
2Annual Book of ASTM Standards,V ol01.06.
3Discontinued,e1990Annual Book of ASTM Standards,V ol01.06. 4Annual Book of ASTM Standards,V ol02.03.
5Discontinued,e1994Annual Book of ASTM Standards,V ol02.03.
6Annual Book of ASTM Standards,V ol14.02.
7Annual Book of ASTM Standards,V ol10.04.
1
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3.Standard Reference Temperature
3.1For the purpo of this specification,all wire dimensions and properties shall be considered as occurring at the interna-tionally standardized reference temperature of 20°C (68°F).
4.Standard Rules for Rounding
4.1All calculations for the standard nominal dimensions and properties of solid round wires shall be rounded in the final value only,in accordance with rounding method of Practice E 29.
5.Standard Nominal Diameters
5.1Standard nominal diameters of AWG sizes of solid round wires shall be calculated in accordance
with the conven-tional mathematical law of the American Wire Gage (e Explanatory Note 1)and in accordance with Section 4.
5.2For wire sizes 4/0to 44AWG,inclusive,nominal diameters shall be expresd in no more than four significant figures but in no ca clor than the nearest 0.1mil (0.0001in.).
5.3For wire sizes 45to 56AWG,inclusive,nominal diameters shall be expresd to the nearest 0.01mil (0.00001in.).
5.4The standard nominal diameters expresd in mils have been calculated in accordance with the rules and are given in Table 1for convenient reference (Explanatory Note 2).
6.Standard Nominal Cross-Sectional Areas
6.1Standard nominal cross-ctional areas in circular mils and square millimetres shall be calculated in accordance with
the following equations and shall be rounded in accordance with Section 4to the same number of significant figures as ud in expressing the standard diameters,but in no ca to less than three significant figures:
Area,cmil 5d 2
Area,mm 25d 235.06731024
where:
d =diameter of th
e wire in mils as given in Table 1.
Standard nominal cross-ctional areas in circular mils and square millimetres have been calculated in accordance with the foregoing rules and are given in Table 1for convenient reference.
7.Rules for Calculations Involving Mass and Length 7.1Standard nominal mass and lengths shall be calculated from the standard wire diameters specified in Table 1,in accordance with the following equations.They shall be rounded in the final value only,in accordance with Section 4,to the same number of significant figures as ud in expressing the standard diameters,but in no ca to less than three significant figures:
W 5d 23d 30.3404931023L 5~1/d 2!3~1/d !32.93693106
where:
W =mass,lb/1000ft,
d =diameter of th
e wire in mils as given in Table 1,
TABLE 1Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires at 20°C
Size Diameter
Cross-Sectional Area Size Diameter Cross-Sectional Area AWG mils mm cmils mm 2AWG mils mm cmils mm 24/0460.011.684211600107.22911.30.2871280.06473/0409.610.40416780085.03010.00.2541000.05072/0364.89.2613310067.4318.90.22679.20.04011/0324.98.2510560053.5328.00.20364.00.03241289.37.358369042.4337.10.18050.40.02552257.6 6.546636033.634 6.30.16039.70.02013229.4 5.825262026.735 5.60.14231.40.01594204.3 5.194174021.136 5.00.12725.00.01275181.9 4.623309016.837 4.50.11420.20.01036162.0 4.112624013.338 4.00.10216.00.008117144.3 3.672082010.639 3.50.089012.20.006218128.5 3.26165108.3740 3.10.07879.610.004879114.4 2.9113090 6.6341 2.80.07117.840.0039710101.9
2.5910380 5.2642 2.50.0635 6.250.003171190.7 2.308230 4.1743 2.20.0559 4.840.002451280.8 2.056530 3.3144 2.00.0508 4.000.002031372.0 1.835180 2.6345 1.760.0447 3.100.001571464.1 1.634110 2.0846 1.570.0399 2.460.001251557.1 1.453260 1.6547 1.400.0356 1.960.0009931650.8 1.292580 1.3148 1.240.0315 1.540.0007791745.3 1.152050 1.0449 1.110.0282 1.230.0006241840.3 1.0216200.823500.990.02520.9800.0004971935.90.90412900.653510.880.02240.7740.0003922032.00.81310200.519520.780.01980.6080.0003082128.50.7248120.412530.700.01780.4900.0002482225.30.6436400.324540.620.01580.3840.0001952322.60.5745110.259550.550.01400.3020.0001532420.10.5114040.20556
0.49
0.0125
0.240
0.000122
2517.90.4553200.1622615.90.4042530.1282714.20.3612020.10228
12.6
0.320
159pmp项目管理师
0.0804
d =density of th
trevor arizae wire material at 20°C in g/cm 3as given in Table 2,and L =length,ft/lb.
8.Rules for Calculations Involving Resistivity
8.1Standard nominal resistances and other values derived from the resistivity units shall be calculated from the standard wire diameters specified in Table 1in accordance with the following equations.All values so derived shall be rounded in the final value only,in accordance with Section 4,to the same number of significant figures as ud in expressing the standard diameters,but in no ca to less than three significant figures:
D 2c resistance at 20°C,V /1000ft 5[r /~d 23d !#3105.35
D 2c resistance at 20°C,V /lb 5[r /~d 23d 4!#30.309403106
Length at 20°C,ft/V 5[~d 23d !/r ]39.4924Mass at 20°C,lb/V 5[~d 23d 4!/r ]33.232131026
where:
d =diameter of th
e wire in mils as given in Table 1,
r =resistivity of the wire material at 20°C in V ·lb/mile 2as
given in Table 2(Explanatory Note 3),and
d =density of th
e wire material at 20°C in g/cm 3as given
in Table 2.9.Rules for Calculating Rated Strength
9.1Standard rated strengths shall be calculated from the standard wire diameters specified in Table 1in accordance with
TABLE 2Density and Resistivity of Electrical Conductor Materials
Material
Density,d ,at 20°C,g/cm 3Resistivity A ,r ,at 20°C,V ·lb/mile 2
Material
Density,d ,at 20°C,g/cm 3
Resistivity,r ,at 20°C V ·lb/mile 2
Copper (Specifications B 1,B 2,B
Aluminum-Clad Steel (Specification
6.59
3191
3,B 33,B 47and B 189),B 415)
Volume Conductivity,%IACS:Copper-Clad Steel (Specification
B 227):
attack什么意思
1008.89875.2097.668.89896.15Grade 30HS 8.15272897.168.89900.77Grade 30EHS 8.15272896.668.89905.44Grade 40
8.15204596.168.89910.15Grade 40EHS
8.152045
94.168.89929.52Galvanized Steel (Telephone and 93.15
8.89939.51Telegraph)(Specification A
Bronze (Specification B 9):111):
Class A 8.892188Class A Coating:
Class B 8.891346Grade EBB (Non-Copper
7.785000Class C
8.89
1094
down是什么意思
Bearing)
Copper Alloys (Specification B
Grade BB (Copper Bearing)7.785800105B ):
Grade BB (Non-Copper
7.78
5600
最有前景的专业Grade 8.58.7810169Bearing)Grade 138.786649Class B Coating:
Grade 158.545605Grade EBB (Non-Copper
7.784900Grade 208.894376Bearing)
儿童歌曲mp3下载Grade 308.892917Grade BB (Copper Bearing)7.785600Grade 408.892188Grade BB (Non-Copper
7.78
5450
Grade 558.891591Bearing)Grade 658.891346Class C Coating:
Grade 748.891183Grade EBB (Non-Copper
7.784800Grade 808.891094Bearing)
Grade 85
8.891030
Grade BB (Copper Bearing)7.785400Aluminum,1350(Specifications B
Grade BB (Non-Copper
7.78
5300环保材料英语
230/B 230M,B 314,and B 609/B 609M),
Bearing)Volume Conductivity,%IACS:Galvanized Steel (Telephone and
Telegraph)(Specification A 326):
61.8 2.705430.9161.2 2.705435.1361.0
2.705436.56
Class A Coating:Aluminum Alloys (Specifications B
Grade 85
7.835800396and B 398/B 398M)Class B Coating:Alloy 5005–H19 2.70496.84Grade 1357.836500Alloy 6201–T81
2.69504.43
Grade 857.805600Aluminum Alloy 8000Series
Grade 1357.806300(Specification B 800)Class C Coating:Volume Conductivity,%IACS:Grade 857.77540061.0
2.71437.36
Grade 135
7.77
6100
A To convert from V ·lb/mile 2to V ·g/m 2multiply by 5710.0.See Table 1in Test Method
B 193.
B
Various compositions are permitted for some of the grades in Specification B 105and the density value may not apply to all materials supplied to this specification.In ca of doubt,the density value should be determined or obtained from the
manufacturer.
the following equation and shall be rounded in the final value only,in accordance with Section 4,to the same number of significant figures as ud in expressing the standard diameters,but in no ca to less than three significant figures:
Rated strength,lb 5d 23T 30.785431026
where:
d =diameter of th
e wire in mils as given in Table 1,and T =tensile strength,psi,applicable to the wire material,
temper,and size,for which reference should be made to the specifications which cover the material.10.Tolerances
10.1The standard dimensions given in Table 1and the calculated values for mass,resistances,and rated strengths
obtained by the u of the formulas included in this specifica-tion are all nominal values.This specification is not concerned with quantitative values of tolerances per ,but it is contem-plated that the standard nominal wire dimensions specified in Table 1,and the properties derived therefrom,shall be made subject to tolerances as indicated in either the individual specifications applicable to the wires of various materials and tempers or as may be mutually agreed by the manufacturer and the purchar.
EXPLANATORY NOTES
N OTE 1—Except for certain class of wire products,the American Wire Gage (formerly known as the Brown &Sharpe Gage)has been almost universally employed in the United States for many years for the designation of wire sizes.This gage is bad upon fixed diameters for two wire sizes (4/0and 36AWG,respectively),and the simple mathematical law that the thirty-eight intermediate gage designations vary in size in geometric progress.The extent of the American Wire Gage is not,however,limited to the forty gage numbers from 4/0to 36AWG,inclusive,both larger and smaller si
zes being determined by extrapolation in accordance with the geometric progression mentioned.Like many other wire gages,the American Wire Gage is an inver gage,that is,a higher size number denotes a wire of smaller size.
The specified diameters for sizes 4/0AWG and 36AWG are 460mils and 5mils,respectively (1mil is equal to 0.001in.).Designating the ratio between ascending adjacent wire sizes by r ,and the ratio between descending adjacent wire sizes by 1/r ,the law of the American Wire Gage is indicated explicitly by an ascending and descending ries,expresd in tabular form as shown in Table 3.
It is implicit in the ries that the diameters of the various AWG wire sizes may be calculated either by ascending from d =5for size 36AWG,or descending from d =460for 4/0AWG,for intermediate sizes,as well as descending from =5for size 36AWG,for sizes 37AWG and smaller.It is further implicit in the ries that the diameter of any AWG size of wire may be derived directly from any other AWG size who diameter is known by multiplying the known diameter by r n or 1/r n ,as the ca may be,where n is the number of steps between the two gage numbers.For example,size 18AWG is eighteen gage numbers apart from 36AWG,and twenty-one gage numbers apart from size 4/0AWG.The diameter of size 18AWG is,then,
d 185d 363r 185531.1229322185538.060653540.30mils or:
d 185d 4/0/r 21546030.8905257121
546030.0876144540.30mils
Similarly,size 45AWG is nine gage numbers removed from size 36AWG,from which the diameter of size 45AWG is:
d 455d 36/r 95530.8905257195530.35222351.761mils Sincpangaea
e areas and mass vary directly as the square o
f wire diameter,it can be shown similarly that the mathematical law of the American Wire Gage holds rigorously for the quantities when the ratio of r 2(1.2609767)or 1/r 2(0.79303605),as the ca may be (dependin
g upon the quantity involved and whether the calculation is an ascending or descending one),is assigned to the properties of adjacent gage sizes.Thus,for size 18AWG,the circular-mil area is given by the expression:
A 185A 36r 3652531.260976718525364.972151624cmils or:
A 185A 4/0/r 42
5211,60030.79303605215211,60030.0076762951624cmils
Similar calculations can be made for mass where the quantities are known for size 36AWG or size 4/0AWG.
N OTE 2—AWG numbers appearing in Columns 1and 5of Table 1are given only to facilitate conversion from AWG numbers to the wire size in mils.It is emphasized that this is not intended to be an endorment of the
TABLE 3American Wire Gage Series
Ascending Wire Sizes:Step 37383940AWG No.
<1/02/03/04/0Wire diameter,mils
5
5r
5r 2
5r 3
5r 4
...
5r 36
5r 37
5r 38
5r 39
=460
Descending Wire Sizes:Step 37383940AWG No.
4/03/0
2/0
1/0
1
...33460344603546036460Wire diameter,mils
460
460⁄r
460⁄r2
460⁄r3
460⁄
r4
...
460⁄r36460⁄r37460⁄r38460⁄r39
=5
Since the last wire diameter term of both the ascending and descending ries indicates that r 39=460/5=92,the value for r is 921/39=1.1229322,and the value of 1/r is
0.89052571.
u of AWG numbers to designate wire sizes.Wire diameters should be specified in mils as shown in Table 1,Columns 2and 6.
Micrometer calipers calibrated to measure 0.1mil (0.0001in.)should be considered satisfactory for measuring the diameters of 4/0to 44AWG (0.4600to 0.0020in.)inclusive.
夹子英语
For greater accuracy in obtaining the mean diameter of ultrafine wire size 45to 56AWG (0.00176to 0.
00049in.)inclusive,Test Method F 205should be considered satisfactory.The density values in Table 2shall be ud in determining constants C and K .
N OTE 3—The value of 875.20V ·lb/mile 2at 20°C (68°F)is the mass resistivity equivalent to the International Annealed Copper Standard (IACS)for 100%conductivity.This term means that a wire one mile in length,with a mass of 1lb,would have a resistance of 875.20V .This is equivalent to a resistivity value of 0.15328V ·g/m 2which signifies the
resistance of a wire 1m in length with a mass of 1g.It is also equivalent for example to a volume resistivity of 1.7241µV /cm of length of a bar 1cm 2in cross ction.A complete discussion of this subject is contained in NBS Handbook 100of the National Institute of Standards and Technol-ogy.8Conversion of the various units of mass resistivity,volume resistiv-ity,and conductivity may be facilitated by employing the formulas and factors shown in Table 1of Test Method B 193.The factors given therein are applicable to all metallic electrical conductor material.Table 2lists values of d for the common electrical conductor materials.
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