1、Designation:D104998(Reapproved 2010)Standard Specification forRubber Insulating Covers1This standard is issued under the fixed designation D1049;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 pa
2、rentheses indicates 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 Department of Defense.1.Scope1.1 This specification covers acceptance testing of rubberinsulating cover
3、s for use as portable protective devices forprotection of workers from accidental contact with live elec-trical conductors,apparatus,or circuits.It includes insulatorhoods,dead-end protectors,line hose connectors,cable endcovers,and miscellaneous covers.The electrical,physical,andchemical requiremen
4、ts of this specification shall apply also toany new or modified styles of covers that may be developed forspecific purposes.1.2 Three types of covers,differing in chemical and physicalcharacteristics,are provided,and are designated as Type I,non-resistant to ozone,and Type II and Type III,resistant
5、toozone.1.3 Five classes of covers,differing in electrical character-istics,are provided,and are designated as Class 0,Class 1,Class 2,Class 3,and Class 4.1.4 Five styles of covers,differing in design characteristics,are provided,and are designated as Style A,Style B,Style C,Style D,and Style E.NOTE
6、1Because of the use requirements some covers are semi-rigidand others flexible.The flexible devices should remain suitably flexible forapplication and removal through normal temperatures of 29 to 54.5C(20 to 130F).1.5 This standard does not purport to address all of thesafety concerns,if any,associa
7、ted 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 18.2.2.Referenced Documents2.1 ASTM Standards:2D297 Test Methods for Rubber ProductsChemical Analy-s
8、isD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD573 Test Method for RubberDeterioration in an AirOven3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 breakdownthe electrical discharge or arc occurringbetween the electrodes and through the equipment
9、 being tested.3.1.2 flashoverthe electrical discharge or arc occurringbetween electrodes and over or around,but not through,theequipment being tested.3.1.3 ozonea very active form of oxygen that may beproduced by corona,arcing,or ultraviolet rays.3.1.4 ozone cutting and checkingthe cutting action pr
10、o-duced by ozone on rubber under mechanical stress into a seriesof interlacing cracks.3.1.5 rubbera generic term that includes elastomers andelastomeric compounds,regardless of origin.3.1.6 user as used in 4.3.1,the entity employing the actualworker(s)using the equipment;if no separate employer,then
11、the individual.3.1.7 voltage,maximum usethe ac voltage(rms)rating ofthe protective equipment that designates the maximum nominaldesign voltage of the energized system that may be safelyworked.The nominal design voltage is equal to the phase tophase voltage on multiphase circuits.3.1.7.1 DiscussionIf
12、 there is no multiphase exposure in asystem area and the voltage exposure is limited to phase1This 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
13、standard replacesANSI Standard J6.2,which is no longer available.Current edition approved Oct.1,2010.Published November 2010.Originallypublished in 1949 as D1049 49 T.Last previous edition approved in 2002 asD1049 98(2002)1.DOI:10.1520/D1049-98R10.2For referenced ASTM standards,visit the ASTM websit
14、e,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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1(polarity
15、 on dc systems)to ground potential,the phase(polarityon dc systems)to ground potential shall be considered to be thenominal design voltage.If electrical equipment and devices areinsulated,or isolated,or both,such that the multiphase expo-sure on a grounded wye circuit is removed,then the nominaldesi
16、gn voltage may be considered as the phase-to-groundvoltage on that circuit.3.1.8 voltage,nominal designa nominal value consistentwith the latest revision on ANSI C84.1,assigned to the circuitor system for the purpose of conveniently designating itsvoltage class.4.Significance and Use4.1 This specification covers the minimum electrical,chemical,and physical properties guaranteed by the manufac-turer and the detailed procedures by which such properties areto be determined.The purchaser may at his
