>> P.10
LightningprotectionzoneconceptThebuildingisdividedintodifferentendangeredzones.Thesezoneshelptodefinethenecessaryprotectionmeasures,inparticularthelightningandsurgeprotectiondevicesandcomponents.PartofanEMCcompatible(EMC:ElectroMagneticCompatibility)lightningprotectionzoneconceptistheexternallightningprotectionsystem(includingair-terminationsystem,down-conductorsystem,earth-terminationsystem),equipotentialbonding,spatialshieldingandsurgeprotectionforthepowersupplyandinformationtechnologysystems.Definitionsapplyasclassified.:ClassISPD:ClassIISPDLPZ0ALPZ0LPZ1MaindistributionboardEachfloorLPZ2DistributionboardPowerlineInsidethedeviceLPZ3EquipmentOverviewofLightningProtectionZones(LPZ)LightningprotectionzoneExternalAccordingtotherequirementsandloadsplacedonsurgeprotectivedevices,theyarecategorizedaslightningcurrentarresters"ClassI",surgearresters"ClassII".Thehighestrequirementsareplacedonthedischargecapacityoflightningcurrentarresters"ClassI"usedatthetransitionfromlightningprotectionzone0Ato1or0Ato2.Thesearrestersmustbecapableofconductingpartiallightningcurrentsof10/350µswaveformseveraltimeswithoutbeingdestroyedinordertopreventtheingressofdestructivepartiallightningcurrentsintotheelectricalinstallationofabuilding.AtthetransitionpointfromLPZ0Bto1ordownstreamofthelightningcurrentarrester"ClassI"atthetransitionpointfromLPZ1to2andhigher,surgearresters"ClassII"areusedtoprotectInternalOverviewLPZ0ALPZ0BLPZ1LPZ2Zonesendangeredbydirectlightning,totallightningcurrent,andtotallightningfield.Azonethatisprotectedagainstdirectlightningbutisendangeredbypartiallightningcurrentsandfulllightningmagneticfields.Zonesthatareprotectedagainstdirectlightningbutareexposedtolimitedlightningorinducedcurrentsandattenuatedlightningmagneticfields.Azonethatisprotectedagainstdirectlightning,butisexposedtoinducedcurrentsandlightningmagneticfieldsthatareevenmoreattenuatedthanLPZ1.SPDclassesandcategoriesSPDprotectionisalsorecommendedforoutdoorequipment.TypeI,CategoryD1TypeII,CategoryC2againstsurges.Theirtaskisbothtoreducetheresidualenergyoftheupstreamprotectionstagesevenfurtherandtolimitthesurgesinducedorgeneratedintheinstallationitself.Thelightningandsurgeprotectivemeasuresattheboundariesofthelightningprotectionzonesdescribedaboveequallyapplytopowersupplyandinformationtechnologysystems.AllmeasuresdescribedintheEMCcompatiblelightningprotectionzoneconcepthelptoachievecontinuousavailabilityofelectricalandelectronicdevicesandinstallations.10
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