ASTM_D_7936_-_20.pdf

Designation:D793620Standard Test Method forFlammability of Electrical Insulating Materials Intended forWires or Cables When Burning in Horizontal Configuration1This standard is issued under the fixed designation D7936;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.Scope1.1 This is a fire-test-response standard.1.2 This fire test method is applicable to the electricalinsulation materials contained in wires or cables.1.3 The ignition source is a gas burner fueled by methane ornatural gas.1.4 Use the values stated in SI units in referee decisions;seeIEEE/ASTM SI-10.The values given in parentheses after SIunits are provided for information only and are not consideredstandard.1.5 This standard is used to measure and describe theresponse of materials,products,or assemblies to heat andflame under controlled conditions,but does not by itselfincorporate all factors required for fire hazard or fire riskassessment of the materials,products,or assemblies underactual fire conditions.1.6 Fire testing is inherently hazardous.Adequate safe-guards for personnel and property shall be employed inconducting these tests.1.7 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and CableD1711 Terminology Relating to Electrical InsulationD5025 Specification for Laboratory Burner Used for Small-Scale Burning Tests on Plastic MaterialsD5207 Practice for Confirmation of 20mm(50W)and125mm(500W)Test Flames for Small-Scale BurningTests on Plastic MaterialsE176 Terminology of Fire Standards2.2 ISO Standard:3ISO 13943 Fire Safety Vocabulary3.Terminology3.1 Definitions:3.1.1 For definitions of terms relating to electrical andelectronic insulating materials,the definitions in this testmethod are in accordance with Terminology D1711.For termsrelating to fire,the definitions in this test method are inaccordance with Terminology E176 and ISO 13943.In case ofconflict,the definitions given in Terminology E176 shallprevail.4.Summary of Test Method4.1 In this test method,the electrical insulation material testspecimen is mounted horizontally and ignited with a smallburner,applying a 500 W flame,for a period of 30 s.4.2 The burner gas is methane or natural gas(see 6.4).4.3 A cotton mat is placed under the test specimen tocapture droplets falling from the test specimen and determinewhether flaming ignition of the cotton occurs.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.17 on Fire and Thermal Properties.Current edition approved Oct.1,2020.Published November 2020.DOI:10.1520/D7936-20.2For 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 Organization for Standardization(ISO),ISOCentral Secretariat,BIBC II,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,http:/www.iso.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.4 The report records the distance the flame travels,theduration of flaming after removal of the igniter flame andwhether flaming material has dropped from the test specimenand ignited the cotton mat.5.Significance and Use5.1 This horizontal flame test method measures the abilityof the material to cease flaming when the source of ignitionused is removed.5.2 This test method also provides a measure of the capa-bility of the material to spread flame by dripping of flamingparticles.5.3 This test method is used to assess the horizontal flametest performance of electrical insulation materials in TestMethods D470.5.4 In this test method,t