1、Designation: B263/B263M 04 (Reapproved 2010)1Standard 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
2、revision, the year of last 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 Department of Defense.1NOTEDesignation was correc
3、ted editorially in October 2013.1. Scope1.1 This test method covers the procedure for 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 equi
4、valents; therefore, each system shall be usedindependently of the other. Combining values 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 u
5、ser of this standard to establish appro-priate safety and health practices and determine the 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
6、for Uniform Test Methods and Fre-quency3. Terminology3.1 Definitions of Terms Specific to This 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 s
7、o forth) selected at random from thelot for the purpose of determining conformance of the lot to therequirements 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 me
8、asurement of mass, accurate to 0.1 %.4.2 Steel Scale, for measurement of length, with smallestdivisions not greater than132 in. 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 o
9、rspool lengths, or from either end of coiled lengths.5.2 Unless otherwise specified by the purchaser at the timeof 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 t
10、est specimens shall be as follows:Nominal Size of Test Specimen,cmil mm2Length of Test Specimen min,ft mmUp to 17 000 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 spec
11、imen at room temperature(see Note) to the nearest132 in. 1 mm, and measure the massto within 60.1 %, converting to pounds grams if weighed inother units.NOTE 1Correction for temperature variation need not be made, sincethe error introduced in the length measurement by the temperaturevariation is les
12、s than the required accuracy of the length measurement.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 Oct. 1, 2010. Published December
13、2010. Originallyapproved in 1956. Last previous edition approved in 2004 as B263 04. DOI:10.1520/B0263_B0263M-04R10E01.2For 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
14、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 States18. Calculation8.1 Calculate the cross-sectional area of a strandedconductor, composed of only one type of conducting material,as
15、 follows:A 5 1000/L! 3 100/1001k!# 3 W/f!where:A = cross-sectional area, cmil mm2,W = mass of test specimen, lb g,L = length of test specimen, ft mm,f = mass factor, lb/cmil1000 ft g/cm3, (Table 2), andk = increment (increase) of weight and electrical resistance(from product specifications), %.8.2 C
16、alculate the cross-sectional area of the conductingmaterial of cored annular conductors and steel-reinforcedaluminum conductors as follows:A 5 1000/L! 3 100/1001k!# 3 W12 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 t
17、he 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 resistanceof the conducting material (from productspecifications), %.8.3 Calculate the cross-sectional area (expr
18、essed as thehard-drawn copper equivalent) of composite copper andcopper-covered steel conductors, as follows:A 5 1000/L! 3 100/1001k!# 3Wcu/fcu!1ZWccs/fccs!#where:A = cross-sectional area, cmil mm2,Wcu= mass of copper strands in test specimen, lb g,Wccs= mass of copper-covered steel strands in tests
19、pecimen, lb g,L = length of test specimen, ft mm,fcu= mass factor of copper strands in test specimen,lb/cmil1000 ft g/cm3(Table 2),fccs= mass factor of copper-covered steel strands in testspecimen, lb/cmil1000 ft g/cm3(Table 2),k = increment (increase) of mass and electrical resistance(from product
20、specifications), %, andZ = conductivity (usually 0.30) of copper-covered steelstrands in test specimen.8.4 Calculate the cross-sectional area of composite alumi-num 1350 and aluminum alloy 6201 conductor as follows:A 5 1000/L! 3 100/1001k!# 3 Wa1/fa11Wa1a/fa1a!where:A = cross sectional area, cmil mm
21、2,L = length of test specimen, ft mm,Wa1= mass of aluminum 1350 in test specimen, lb g,Wa1a= mass of aluminum alloy 6201 in test specimen, lbg,fa1= mass factor of aluminum 1350, lb/cmil1000 ft g/cm3, (Table 2),fa1a= mass factor of aluminum alloy 6201, lb/cmil1000 ftg/cm3, (Table 2), andk = increment
22、 (increase) of mass and electrical resistancefor the complete conductor (from productspecifications), %.NOTE 2The above method can also be used for a composite aluminumconductor manufactured using a combination of other alloys.9. Precision and Bias9.1 PrecisionThis test method has been in use for ma
23、nyyears. No statement of precision has been made and no workhas been planned to develop such a statement.9.2 BiasThis test method has no bias because the value forcross-sectional area is determined solely in terms of this testmethod.10. Keywords10.1 cross-sectional area; mass method; stranded conduc
24、torTABLE 1 Number of Production Units Required per SampleNominal Conductor Size, cmil mm2Number of Production Units inSampleFor First100 000 ft30 000 mAorfraction thereofFor Each Additional100 000 ft30 000 mAorfraction thereofUp to 83 690 50 incl 1 1Over 83 690 to 211 600 50 to 110, incl 2B1Over 211
25、 600 to 500 000 110 to 260, incl 3B1Over 500 000 260 4B1ANot more than one specimen per production unit shall be taken if the length inany one unit exceeds 100 000 ft 30 000 m.BIf the number of units in the shipment is less than that indicated, one specimenshall be taken from each unit.TABLE 2 Mass
26、Factors, fMetalMass Factor, f,lb/cmil1000 ftg/cm3Copperbare, tinned, lead-coated, or lead alloy-coated 0.0030270 8.890Aluminum 1350 0.0009189 2.705Aluminum alloy 6201 0.0009142 2.690Aluminum alloys, 8000 series 0.0009236 2.710Copper-clad steel, all grades 0.0027750 8.150Zinc-coated (galvanized) stee
27、l, all grades 0.0026490 7.780Aluminim-clad steel 0.0022440 6.590B263/B263M 04 (2010)12ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of t
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30、s have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or mul
31、tiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).B263/B263M 04 (2010)13
