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What pulse forms are there?Planning aid, generalinformationPulse types and their characteristics: Yellow = pulse shape 1, direct lightning strike, 10/350 µs simulated lightning pulse, red = pulse shape 2, remotelightning strike or switching operation, 8/20 µs simulated lightning pulse (Surge)02 TBS-Katalog_2010_Neuer_Stand / en / 30/03/2010 (LLExport_00986)High lightning currents can flow tothe ground during a storm. If abuilding with external lightning protectionreceives a direct hit, a voltagedrop occurs on the earthingresistor of the lightning protectionequipotential bonding system,which represents a surge voltageagainst the distant environment.This rise in potential poses a threatto the electrical systems (e.g. voltagesupply, telephone systems,cable TV, control cables, etc.) thatare routed into the building.Suitable test currents for testingdifferent lightning and surge protectorshave been defined in nationaland international standards.Direct lightning strike: Pulseshape 1Lightning currents that can occurduring a direct lightning strike canbe imitated with the surge currentof wave form 10/350 µs. The lightningtest current imitates both thefast rise and the high energy contentof natural lightning. Lightningcurrent arrestor Type 1 and externallightning protection componentsare tested using this current.Remote lightning strikes orswitching operations: Pulseshape 2The surges created by remotelightning strikes and switching operationsare imitated with test impulse8/20 µs. The energy contentof this impulse is significantly lowerthan the lighting test current ofsurge current wave 10/350 µs.Surge arrestor Type 2 and Type 3are impacted with this test impulse.TBSOBO11