SummaryofBS476:Part22:1987Methodfordeterminationofthefireresistanceofnon-loadbearingelementsofc***tructionPurposeThispartofBS476describesproceduresfordeterminingthefireresistanceofnon-loadbearingelementsofbuildingc***tructionwhensubjectedtotheheatingandpressureconditi***specifiedinBS476:Part20.Thispartisapplicabletoverticalpartiti***,tofully,partiallyinsulatedanduninsulatedverticaldoorsetsandshutterassemblies(exceptfiredampersincorporatedinducts,toceilingmembranes,andtoglazedelements).MethodThetestconditi***andapparatusarespecifiedinBS476:Part20.1.Determinationoffireresistanceofpartiti***andnon-loadbearingwallsprovidingverticalseparationa.Testspecimen:Noemallytwospecimens(atleast3mby3m)aretested.Thespecimenincorporatesanymechanicaljointsintheelementandanyserviceswheretheseformanintegralpartoftheelementasusedinpractice.b.Theprocedure:ThetestiscarriedoutinaccordancewithBS476:Part20.TheunexposedfaceofthespecimenismonitoredforintegrityandinsulationinaccordancewithPart20,andfailureisdeterminedwithrespecttothesetwoparameters.2.Determinationoffireresistanceofdoorsets,shutterassemblies,liftlandingdoorsandotheressentiallyverticalseparatingelementsdesignedtoallowtheingressofpersonnelorgoodsa.Testspecimen:Normallytwospecimensaretested,thespecimenbeingfullsizeandmountedwithinanappropriatesectionofassociatedc***truction.b.Theprocedure:ThetestiscarriedoutinaccordancewithBS476:Part20.Fullyandpartiallyinsulatedstructuresaremonitoredforintegrityandinsulationanduninsulatedstructuresforintegrityonlyandtheirfireresistancedeterminedwithrespecttothosecriteria.Theresultisstatedintermsoftheelapsedtimebetweencommencementofheatingandtimeoffailure.3.Determinationoffireresistanceofceilingmembranesa.Testspecimen:Asinglespecimenofatleast4mby3mistestedfromitsunderside.Thespecimenshouldincludejoints,diffusergrilles,lightingfittingsandassociatedwiringwhichformintegralpartoftheelementinpractice.b.Theprocedure:ThetestiscarriedoutinaccordancewithBS476:Part20andobservati***madeofthebeh***iorofthespecimenincludingthemodeoffailureintheeventofcollapse.Thefireresistanceofaceilingmembraneisdeterminedwithrespecttointegrityandinsulation,andtheresultsstatedintermsofelapsedtimebetweenthecommencementofheatingandthetimeoffailure.4.Determinationoffireresistanceofglazedelements(whereover50%ofthesurfaceisglazing)a.Testspecimen:Normallytwospecimensofatleast3mby3maretested,thespecimenbeingc***tructedandfinishedasusedinpractice.Thespecimenismountedinanassociatedc***tructionofawall,partitionordoorofthetypetobeusedinpracticeor,ifnotknown,inac***tructionthathasarecognizedfireresistancegreaterthanthatanticipatedforthespecimenbeingevaluated.Themethodoffixingthespecimentotheassociatedc***tructionisrepresentativeofthatusedinpractice.b.Theprocedure:ThetestiscarriedoutinaccordancewithBS476:Part20andthefireresistanceshallbedeterminedwithrespecttointegrityandinsulation.Theresultisstatedintermsofelapsedtimebetweenthecommencementofheatingandthetimeoffailure.Thestandardizedtemperature/timeconditi***usedinthisevaluationarerepresentativeofonlyonepossiblefireexposureconditionatthefullydevelopedfirestageandthemethoddoesnotquantifythebeh***iourofanelement,forapreciseperiodoftime,inarealfiresituation.Inaddition,duetorestricti***ofsizeandtheabsenceofsurroundingc***truction,thelaboratorytestcannotreproducetheactualbeh***iourpatternofanelementinafire.However,testdatacanprovideabasisformakingengineeringevaluati***.)