1、Designation:B97912Standard Specification forNon-Specular(NS)Surface Finish on Overhead AluminumElectrical Conductors1This standard is issued under the fixed designation B979;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers non-specular surface finisheson overhead aluminum electrical conductors.Overhead alumi-num elect
3、rical conductors,when installed,typically have ashiny surface appearance.This“reflective”or“specular”surface can make a transmission line more noticeable inappearance against the background landscape.A factory treat-ment process of the outer surface of the aluminum wires canrender the surface finish
4、 into a dull,non-reflective,matte greyfinish.This non-reflective or“de-glared”surface finish allowsthe conductor to become less visible when observed from adistance and enables the transmission line to blend in with theskyline or landscape background.21.2 This specification is intended,by means of d
5、iffusereflectance measurement,to establish a uniformity of conduc-tor finish which is acceptable to the user.Such a specificationwill furnish a basis for consistent manufacturing processcontrol.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses ar
6、e mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 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
7、 health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 The following documents,in effect on the date ofmaterial purchase,form part of this specification to the extentreferenced herein:2.2 ASTM Standards:3B354 Terminology Relating to Uninsu
8、lated Metallic Electri-cal Conductors3.Terminology3.1 For definitions of terms relating to conductors,refer todefinitions found in Terminology B354.3.2 Definitions:3.2.1 speculara shiny,reflective appearance.3.2.2 non-speculara matte,non-shiny appearance.3.2.3 de-glaredanother term for non-specular.
9、3.2.4 diffuse reflectionreflection in which light energy isscattered in many directions by diffusion at or below thesurface.4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Aluminum overhead electrical conductor to have anon-specular
10、,Type“NS”surface finish.4.1.2 Unless otherwise specified the default non-speculargray finish requirement shall have an average maximum diffusereflectivity of not more than 32%.5.Equipment5.1 To measure diffuse reflectance,a portable reflectancemeter4shall be employed with search units“Y”or“T”,equipp
11、ed with a green tristimulus filter.5.2 For calibration,use a matte gray reference standardhaving a diffuse reflection value between 23 and 29%.1This test method is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.02 onMethods o
12、f Test and Sampling Procedure.Current edition approved Oct.15,2012.Published January 2013.DOI:10.1520/B0979-12.2The historical origin of this standard is based upon AA/ANSI Standard C7.69originally developed by theAluminumAssociation,Inc.and adopted for recognitionas an American National Standard in
13、 1975.3For 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.4The sole source of supply of the apparatus(Photovolt Reflec
14、tance Meter,ModelNo.577 or 577A)known to the committee at this time is Photovolt Instruments,Inc.If you are aware of alternative suppliers,please provide this information toASTM International Headquarters.Your comments will receive careful consider-ation at a meeting of the responsible technical com
15、mittee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Test Procedure6.1 Four test measurements shall be made on every1 000 000 ft(305 000 m)or fraction thereof produced perorder,per conductor size,with no more tha
16、n one measurementper reel.Test measurements may be made either on theconductor during processing or on samples approximately 15in.(380 mm)long removed from the reel.Care must be takento minimize surface marks and loose stranding due to samplehandling.Samples should be free of any foreign materials suchas oil,grease,dirt,and metal particles.6.2 A1316in.(0.8125 in./20.64 mm)diameter apertureshould be used for measuring 397 500 cmil(200 mm2)areaconductors and larger.For smaller conductor,a14in.(0.2