1、Designation:F47906(Reapproved 2011)Standard Specification forIn-Service Care of Insulating Blankets1This standard is issued under the fixed designation F479;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.An
2、umber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the in-service care,inspection,testing,and use voltage of insulating blankets for protection ofworkers from acciden
3、tal contact with live electrical conduc-tors,apparatus,or circuits.The product requirements andacceptance testing are as shown in Specification D1048.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that a
4、re provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety problems,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-
5、bility of regulatory limitations prior to use.See Section 6 and8.2 for specific precautionary statements.2.Referenced Documents2.1 ASTM Standards:2D1048 Specification for Rubber Insulating BlanketsD2865 Practice for Calibration of Standards and Equipmentfor Electrical Insulating Materials TestingF81
6、9 Terminology Relating to Electrical Protective Equip-ment for Workers2.2 ANSI Standard:3C39.5 Safety Requirements for Electrical and ElectronicMeasuring and Controlling InstrumentationC84.1 Voltage Ratings for Electric Power Systems andEquipment(60 Hz)3.Terminology3.1 Definitions:3.1.1 breakdownthe
7、 electrical discharge or arc occurringbetween the electrodes and through the equipment being tested.3.1.2 compatiblenot injurious to or changing the physicalor electrical characteristics of the blankets or affecting theirapplication,use,or acceptability.3.1.3 designated personan individual who is qu
8、alified byexperience or training to perform an assigned task.3.1.4 electrical testing facilitya location with qualifiedpersonnel,testing equipment,and procedures for the inspectionand electrical testing of electrical insulating protective equip-ment.3.1.5 electrodethe energized or grounded conductor
9、 por-tion of electrical test equipment which is placed near or incontact with the material or equipment being tested.3.1.6 flashoverthe electrical discharge or arc occurringbetween electrodes and over or around,but not through,theequipment being tested.3.1.7 insulatedseparated from other conducting
10、surfacesby a dielectric substance(including air space)offering a highresistance to the passage of current.3.1.7.1 DiscussionWhen any object is said to be insulated,it is understood to be insulated in a suitable manner for theconditions to which it is subjected.Otherwise,it is,within thepurposes of t
11、his definitions,uninsulated.Insulating covering ofconductors is one means of making the conductor insulated.3.1.8 ozonea very active form of oxygen that may beproduced by corona,arcing,or ultraviolet rays.3.1.9 ozone cutting and checkingthe cracks produced byozone in a material under mechanical stre
12、ss.3.1.10 retestthe tests given after the initial acceptance testusually performed at regular periodic intervals or as requiredbecause of physical inspection.3.1.11 unassigned blanketsblankets that are in storageprior to being issued for use.3.1.12 voltage,maximum usethe ac voltage(rms),classi-ficat
13、ion of the protective equipment that designates the maxi-mum nominal design voltage of the energized system that maybe safely worked.The nominal design voltage is equal to thephase-to-phase voltage on multiphase circuits.3.1.12.1 DiscussionIf there is no multiphase exposure in asystem area,and the v
14、oltage exposure is limited to the 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.Current edition approved Dec.1,2011.Published January 2012.
15、Originallyapproved in 1976.Last previous edition approved in 2006 as F47906.DOI:10.1520/F0479-06R11.2For 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 Documen
16、t Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1(polarity on dc systems)to ground potential,the phase(polarityon dc systems)to ground potential shall be considered to be thenominal design voltage.3.1.12.2 DiscussionIf electrical equipment and devicesare insulated or isolated,or both,