1、Designation:D104814Standard Specification forRubber Insulating Blankets1This standard is issued under the fixed designation D1048;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 indic
2、ates the year of last reapproval.Asuperscript 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 specification covers acceptance testing of rubberinsulating blankets for pro
3、tection of workers from accidentalcontact with live electrical conductors,apparatus,or circuits.1.2 Two types of blankets are provided and are designatedas Type I,not resistant to ozone,and Type II,resistant to ozone.1.3 Five classes of blankets,differing in electricalcharacteristics,are provided an
4、d are designated as Class 0,Class 1,Class 2,Class 3,and Class 4.1.4 Two styles of blankets,differing in constructioncharacteristics,are provided and are designated as Style A andStyle B.1.5 The following safety hazards caveat pertains only to thetest method portion,Sections 16 19,of this specificati
5、on:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Document
6、s2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD297 Test Methods for Rubber ProductsChemical Analy-sisD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD518
7、 Test Method for Rubber DeteriorationSurfaceCracking(Withdrawn 2007)3D570 Test Method for Water Absorption of PlasticsD573 Test Method for RubberDeterioration in an AirOvenD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD1388 Test Method for Stiffnes
8、s of FabricsD2865 Practice for Calibration of Standards and Equipmentfor Electrical Insulating Materials TestingF819 Terminology Relating to Electrical Protective Equip-ment for Workers2.2 American National Standards:ANSI/IEEE C 2 National Electrical Safety Code4C84.1 Electric Power Systems and Equi
9、pmentVoltageRatings(60 Hz)53.Terminology3.1 beaded edge a narrow border of thicker rubber whichextends completely around the outer edges of the blanket.3.2 breakdownthe electrical discharge or arc occurringbetween the electrodes and through the equipment being tested.3.3 designated personan individu
10、al who is qualified byexperience or training to perform an assigned task.3.4 electrical testing facilitya location with qualifiedpersonnel,testing equipment,and procedures for the inspectionand electrical testing of electrical insulating protective equip-ment.3.5 electrode clearancethe shortest path
11、 from the ener-gized electrode to the ground electrode.3.6 flashoverthe electrical discharge or arc occurring be-tween electrodes and over or around,but not through,theequipment being tested.3.7 insulatedseparated from other conducting surfaces bya dielectric substance(including air space)offering a
12、 highresistance to the passage of current.1This specification is under the jurisdiction of ASTM Committee F18 onElectrical Protective Equipment for Workers and is the direct responsibility ofSubcommittee F18.25 on Insulating Cover-Up Equipment.This standard replacesANSI Standard J 6.4,which is no lo
13、nger available.Current edition approved Nov.1,2014.Published December 2014.Originallyapproved in 1949 as D1048 49 T.Last previous edition approved in 2012 asD1048-12.DOI:10.1520/D1048-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm
14、.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Institute of Electrical and Electronics Engineers,Inc.(IEEE),445 Hoes Ln.,P.O.B
15、ox 1331,Piscataway,NJ 08854-1331,http:/www.ieee.org.5Available from National Electrical ManufacturersAssociation,1300 North 17thStreet,Rosslyn,VA 22209.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.7.1 DiscussionWhen any object is sai
16、d to be insulated,itis understood to be insulated in a suitable manner for theconditions to which it is subjected.Otherwise,it is,within thepurpose of this definition,uninsulated.Insulating covering ofconductors is one means of making this conductor insulated.3.8 ozonea very active form of oxygen that may beproduced by corona,arcing,or ultra-violet rays.3.9 ozone cutting and checking cracks produced by ozonein a material under mechanical stress.3.10 rubbera generic term that includes elastomers