1、Designation:B263/B263M14Standard Test Method forDetermination of Cross-Sectional Area of StrandedConductors1This standard is issued under the fixed designation B263/B263M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of la
2、st revision.A number in parentheses indicates the year of last reapproval.A superscript 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 test method covers the procedure f
3、or determiningthe cross-sectional area of stranded conductors by the massmethod.1.2 The values stated in inch-pound or SI units are to beregarded separately as the standard.The values in each systemare not exact equivalents;therefore,each system shall be usedindependently of the other.Combining valu
4、es from the twosystems may result in nonconformance with the specification.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine t
5、he applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 The following documents form a part of this test methodto the extent referenced herein.2.2 ASTM Standards:2B830 Specification for Uniform Test Methods and Fre-quency3.Terminology3.1 Definitions of Terms Specific to Th
6、is Standard:3.1.1 lot,na lot is any amount of stranded conductor ofone type and size presented for acceptance at one time.3.1.2 sample,na sample is a quantity of production units(reels,spools,coils,and so forth)selected at random from thelot for the purpose of determining conformance of the lot to t
7、herequirements of this test method.3.1.3 specimen,na specimen is a length of strandedconductor removed for test purposes from any individualproduction unit of the sample.4.Apparatus4.1 Balance,for measurement of mass,accurate to 0.1%.4.2 Steel Scale,for measurement of length,with smallestdivisions n
8、ot greater than132in.1 mm.4.3 Jig,or equivalent equipment,for cutting the conductorto length and at right angles to its axis.5.Sampling5.1 Samples shall be taken from the outer end of reel orspool lengths,or from either end of coiled lengths.5.2 Unless otherwise specified by the purchaser at the tim
9、eof placing the order,a sample shall consist of the number ofproduction units(reels or coils)shown in Table 1 or inaccordance with Specification B830.6.Test Specimens6.1 The length of test specimens shall be as follows:Nominal Size of Test Specimen,cmil mm2Length of Test Specimen min,ft mmUp to 17 0
10、00 9,inclOver 17 000 94 12202 6107.Procedure7.1 Cut the test specimen,making sure that the ends are atthe right angles to the axis of the conductor.7.2 Measure the length of the specimen at room temperature(see Note)to the nearest132in.1 mm,and measure the massto within 60.1%,converting to pounds gr
11、ams if weighed inother units.NOTE1Correction for temperature variation need not be made,sincethe error introduced in the length measurement by the temperaturevariation is less than the required accuracy of the length measurement.8.Calculation8.1 Calculate the cross-sectional area of a strandedconduc
12、tor,composed of only one type of conducting material,as follows:1This test method is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.02 onMethods of Test and Sampling Procedure.Current edition approved April 1,2014.Published A
13、pril 2014.Originallyapproved in 1956.Last previous edition approved in 2010 as B263/B263M 04(2010)1.DOI:10.1520/B0263_B0263M-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,re
14、fer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 A 51000/L!3100/1001k!#3W/f!where:A=cross-sectional area,cmil mm2,W=mass of test specimen,lb g,L=length of test specimen,ft mm,f=
15、mass factor,lb/cmil1000 ft g/cm3,(Table 2),andk=increment(increase)of weight and electrical resistance(from product specifications),%.8.2 Calculate the cross-sectional area of the conductingmaterial of cored annular conductors and steel-reinforcedaluminum conductors as follows:A 51000/L!3100/1001k!#
16、3W12 W2!/f#where:A=cross-sectional area,cmil mm2,W1=mass of test specimen of the complete conductor,lbg,W2=mass of the core of the test specimen of the completeconductor,lb g,L=length of test specimen,ft mm,f=mass factor,in lb/cmil1000 ft g/cm3,(Table 2),andk=increment(increase)in mass and electrical resistanceoftheconductingmaterial(fromproductspecifications),%.8.3 Calculate the cross-sectional area(expressed as thehard-drawn copper equivalent)of composite copper andcopper-covered steel conduct