>> P.16
LightningCountermeasuresExample[Building]Sincetherooftopandbottomoorofthebuilding,thepowerlead-insecon,andthetelephonelinelead-insectionareaffectedbythedirectlightningsurge(LPZ1),SPDs(classI,categoryD1)correspondingtothedirectlightningsurgewillbeinstalled.Themiddleoorisaffectedbyinducedlightningsurges(LPZ2),thereforeSPDs(classII,categoryC2)thatsupportinducedlightningsurgeswillbeinstalled.Inparticular,forimportantequipmentsuchascentralmonitoringboardsanddisasterpreventionboards,wewillimplementmeasuresforeachequipmentindividually.Inaddition,therearemultiplegroundingelectrodesinthebuilding,andifapotentialdifferenceisgeneratedbetweenthesegroundingelectrodesalightningsurgemayinvade.Therefore,aclassIcompatibleSPDisconnectedbetweeneachgroundingelectrodetosuppressthepotentialdifference.eeeeaeForsignallineutetstutadForpowerlineForLANGroundUnnecessaryCentralizedgroundterminalboardSPDforN-PEtsysteForself-realarmForRS485lineForITVcamerasCubicletypehighpressurepowerreceivingequipmentForhighpressureForlowpressureee16
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