ASTM_D_3353_-_10.pdf

Designation:D335310Standard Test Methods forFibrous-Insulated Magnet Wire1This standard is issued under the fixed designation D3353;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of 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.Scope*1.1 These test methods cover the testing of fibrous-insulatedelectrical conductors,commonly referred to as magnet wire,which are used in electrical apparatus.The test methods areintended primarily for evaluation of the electrical insulatingmaterials used.It is intended that these test methods be used,except where modified by individual specifications for particu-lar applications.1.1.1 These test methods apply to those magnet wires thatare fiber-covered and in which the substrate is bare conductoror is coated with an underlying insulating film as covered byTest Methods D1676.Fiber-covered wires are produced byserving helically or wrapping fibers or fibrous-tape insulationuniformly around the wire in single and multiple layers.Theserved or wrapped materials are bonded or not bonded to theunderlying wire.1.2 The test methods appear in the following sections:ProcedureSectionMeasurement of Dimensions7Electrical Resistance of Conductors5Elongation4Adhesion and Flexibility8Fibrous Coverage6Dielectric Breakdown Voltage91.3 This standard and IEC 60851 are similar if not equiva-lent in technical content.1.4 This standard and NEMA MW 1000 are similar if notequivalent in technical content.1.5 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 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 the applica-bility of regulatory limitations prior to use.See 8.4.1 and 9.4.1for specific caution statements.2.Referenced Documents2.1 ASTM Standards:2B193 Test Method for Resistivity of Electrical ConductorMaterialsD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD1676 Test Methods for Film-Insulated Magnet WireD1711 Terminology Relating to Electrical InsulationD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical InsulationE8 Test Methods for Tension Testing of Metallic Materials2.2 Other Standards:IEC 60851 Methods of Test for Winding Wires3NEMA Standards Publication No.MW 1000 on MagnetWire43.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D1711.3.1.2 Definition of Term(s)Specific to this Standard:3.1.2.1 servinga uniform wrapping of fibrous insulationaround a magnet wire of bare conductor.3.1.2.2 fibrous coverage,of served-magnet wirethat char-acteristic which allows a fibrous served magnet wire to bewound around mandrels in a prescribed manner withoutcausing observable openings in the fibrous coverage.4.Elongation4.1 ScopeThis test method covers the determination of theelongation of fibrous insulated magnet wire that results in afracture of the conductor.1These test methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved Jan.1,2010.Published February 2010.Originallyapproved in 1974.Last previous edition approved in 2004 as D335304.DOI:10.1520/D3353-10.2For 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.3Available from International Engineering Consortium,549 West RandolphStreet,Suite 600,Chicago IL 606612208.4Available from National Electrical Manufacturers Association(NEMA),1300N.17th St.,Suite 1752,Rosslyn,VA 22209,http:/www.nema.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 Significance and UseThe elongation determined bythis test method provides a general measure of the ductility ofthe conductor and the effect of the processing to which it hasbeen subjected during the insulating operation.4.3 ApparatusThe equipment shall have a minimum sepa-ration sufficient to attach and measure the length of the testspecimen between grips,and be capable of elongating thespecimen to its breaking point,at a constant rate.The equip-ment shall be such that the error of the length measurement willbe 1%or less.Suitable,non-slip grips are required th