1、Designation: B 263 04Standard Test Method forDetermination of Cross-Sectional Area of StrandedConductors1This standard is issued under the fixed designation B 263; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. 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 Defense.1. Scope1.1 This test method covers the procedure for d
3、eterminingthe 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 determin
5、e 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:2B 830 Specification for Uniform Test Methods and Fre-quency3. Terminology3.1 Definitions of Terms Specific
6、 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 conformance of
7、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 length, with
8、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 specified
9、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 B 830.6. Test Specimens6.1 The length of test specimens shall be as follows:Nominal Size of Test Specimen,cmil (mm2)Length of
10、 Test Specimen min,ft (mm)Up to 17 000 (9), inclOver 17 000 (9)4 (1220)2 (610)7. 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 me
11、asure 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.1This test m
12、ethod 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, 2004. Published May 2004. Originallyapproved in 1956. Last previous edition approved in 199
13、9 as B 263 99.2For 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 to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor
14、Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Calculation8.1 Calculate the cross-sectional area of a stranded conduc-tor, composed of only one type of conducting material, asfollows:A 5 1000/L! 3 100/100 1 k!# 3 W/f!where:A = cross-sectional area, cmil (mm2),W = mass of test
15、 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 resis-tance (from product specifications), %.8.2 Calculate the cross-sectional area of the conductingmaterial of cored annular conductors an
16、d steel-reinforcedaluminum conductors as follows:A 5 1000/L! 3 100/100 1 k!# 3 W12 W2!/fwhere:A = cross-sectional area, cmil (mm2),W1= mass of test specimen of the complete conductor, lb(g),W2= mass of the core of the test specimen of the completeconductor, lb (g),L = length of test specimen, ft (mm
17、),f = mass factor, in lb/cmil1000 ft (g/cm3), (Table 2),andk = increment (increase) in mass and electrical resis-tance of the conducting material (from productspecifications), %.8.3 Calculate the cross-sectional area (expressed as thehard-drawn copper equivalent) of composite copper andcopper-covere
18、d steel conductors, as follows:A 5 1000/L! 3 100/100 1 k!# 3 Wcu/fcu! 1 ZWccs/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 test speci-men, lb (g),L = length of test specimen, ft (mm),fcu= mass fact
19、or 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 resis-tance (from product specifications), %, andZ = conductivity (usually 0.30) of
20、 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! 3 100/100 1 k!# 3 Wa1/fa11 Wa1a/fa1a!where:A = cross sectional area, cmil (mm2),L = length of test specimen, ft (mm),Wa1= mass of
21、aluminum 1350 in test specimen, lb (g),Wa1a= mass of aluminum alloy 6201 in test specimen, lb(g),fa1= mass factor of aluminum 1350, lb/cmil1000 ft(g/cm3), (Table 2),fa1a= mass factor of aluminum alloy 6201, lb/cmil1000ft (g/cm3), (Table 2), andk = increment (increase) of mass and electrical resis-ta
22、nce for the complete conductor (from productspecifications), %.NOTE 2The above method can also be used for a composite alumi-num conductor 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
23、been made and no workhas been planned to develop such a statement.9.2 BiasThis test method has no bias because the valuefor cross-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 R
24、equired per SampleNominal Conductor Size, cmil (mm2)Number of Production Units inSampleFor First100 000 ft(30 000 m)Aorfraction thereofFor Each Additional100 000 ft(30 000 m)Aorfraction 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),
25、 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 Factors, fMetalMass Fac
26、tor, f,lb/cmil1000 ft(g/cm3)Copperbare, tinned, lead-coated, or lead alloy-coated 0.0030270 (8.890)Aluminum 1350 0.0009189 (2.705)Aluminum alloy 6201 0.0009142 (2.690)Aluminum alloys, 8000 series 0.0009236 (2.710)Copper-clad steel, all grades 0.0027750 (8.150)Zinc-coated (galvanized) steel, all grad
27、es 0.0026490 (7.780)Aluminim-clad steel 0.0022440 (6.590)B263042ASTM 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 validity of any suc
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30、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 multiple 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).B263043
