1、Designation: B263/B263M 14Standard 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
2、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 U.S. Department of Defense.1. Scope1.1 This test method covers the p
3、rocedure 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 equivalents; therefore, each system shall be usedindependently of the other.
4、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 user of this standard to establish appro-priate safety and health practice
5、s 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 for Uniform Test Methods and Fre-quency3. Terminology3.1 Definitions of T
6、erms 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 so forth) selected at random from thelot for the purpose of determining co
7、nformance 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 measurement of mass, accurate to 0.1 %.4.2 Steel Scale, for measurement of
8、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 orspool lengths, or from either end of coiled lengths.5.2 Unless otherwise
9、 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 test specimens shall be as follows:Nominal Size of Test Specimen,cmil mm2L
10、ength 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 specimen at room temperature(see Note) to the nearest132 in. 1 mm, and measur
11、e 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 less than the required accuracy of the length measurement.8. Calculation8.1
12、Calculate the cross-sectional area of a strandedconductor, 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 Proc
13、edure.Current edition approved April 1, 2014. Published April 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 servic
14、eastm.org. For Annual Book of ASTMStandards volume information, refer 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 States1A 5 1000/L! 3 100/1001k!# 3 W/f!where:A = cross-sectional
15、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 Calculate the cross-sectional area of the conductingmaterial of core
16、d 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 the test specimen of the completeconductor, lb g,L = length of test
17、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 (expressed as thehard-drawn copper equivalent) of composite copper andco
18、pper-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 testspecimen, lb g,L = length of test specimen, ft mm,fcu= mass factor o
19、f 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 specifications), %, andZ = conductivity (usually 0.30) of copper-co
20、vered 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 mm2,L = length of test specimen, ft mm,Wa1= mass of aluminum 1350 in
21、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 (increase) of mass and electrical resistancefor the complete condu
22、ctor (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 manyyears. No statement of precision has been made and no workhas bee
23、n 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 conductorTABLE 1 Number of Production Units Required per SampleNominal Co
24、nductor 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 211 600 to 500 000 110 to 260, incl 3B1Over 500 000 260 4B1ANot more th
25、an 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 Factors, fMetalMass Factor, f,lb/cmil1000 ftg/cm3Copperbare, tinned,
26、 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) steel, all grades 0.0026490 7.780Zinc-5 % aluminum mischmetal alloy coat
27、ed steel,all grades0.0026490 7.780Aluminim-clad steel 0.0022440 6.590B263/B263M 142ASTM 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 the
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30、ave 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 multip
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