Electrical Classification.ppt

ElectricalClassification-***撤寓胀拟绝妆持厚划邓迅芝惭臼堆迫帖岛浊Electrical+ClassificationElectrical+ClassificationElectricalClassification-DefinitionsAutoignitionTemperature(AIT).Theminimumtemperaturerequiredtoinitiateorcauseself-bustionofasolid,,(1)ignitableconcentrationsofflammablegasesorvaporsexistundernormaloperatingconditions;or(2)ignitableconcentrationsofsuchgasesorvaporsmayexistfrequentlybecauseofrepairormaintenanceoperationsorbecauseofleakage;or(3)+ClassificationElectrical+ClassificationElectricalClassification-DefinitionsClassI,(1)inwhichvolatileflammableliquidsorflammablegasesarehandled,processed,orused,butinwhichtheliquids,identalruptureorbreakdownofsuchcontainersorsystems,orincaseofabnormaloperationofequipment;or(2)inwhichignitableconcentrationsofgasesorvaporsarenormallypreventedbypositivemechanicalventilation,ehazardousthroughfailureorabnormaloperationoftheventilatingequipment;or(3)thatisadjacenttoaClassI,Division1location,municationispreventedbyadequatepositive-+ClassificationElectrical+ClassificationElectricalClassification-°F(°C).Combustibleliquidsaresubdividedasfollows:ClassIIliquidsarethosehavingflashpointsatorabove100°F(°C)andbelow140°F(60°C).ClassIIIliquidsarethosehavingflashpointsatorabove140°F(60°C),andaresubdividedasfollows:ClassIIIAliquidsarethosehavingflashpointsatorabove140°F(60°C)andbelow200°F(°C).ClassIIIBliquidsarethosehavingflashpointsator