Level IV is the least restrictive, which means that, although it intercepts high current lightning, it may not capture low current lightning. The protection radius of a lightning rod for each height is calculated with the advance time of the lightning rod and the level of protection against lightning (Technical Building Code, CTE the UNE 21186 standard NF C 17-102 and NP 4426). An ESE device with a longer lead time in the formation of the upward tracer (more time in advance of the ignition), captures the downward tracer at a greater distance, protecting a larger area. Interception: DAT CONTROLER® Air terminalĮarly Streamer Emission (ESE) air terminals are characterised by continuously emitting an upward tracer to intercept the downward lightning tracer before any other element within its protection radius. External lightning protection systemĪn external lightning protection system consists of one or more lightning rod ends, two or more down conductors and an earthing system. The following is a guide to design a comprehensive lightning protection system, based on Aplicaciones Tecnológicas S.A.’s recommended products. These maximum and minimum values are used for the dimensioning of the LPS elements (thickness of the metal sheets, current capacity of the surge arresters, separation distances against dangerous sparks), for the test parameters and for the positioning of the LPS sensors. The lightning protection level of a LPS considers both the lightning current parameters and the probability of not exceeding the maximum and minimum design values in the event of a thunderstorm. The lightning protection standards define procedures for calculating the risk index of a structure to determine the required installation of a lightning protection system (LPS) and the level of protection it should provide. The purpose of a lightning protection system is to capture lightning, conduct its current safely to earth, dissipate in the ground and protect against the secondary effects of lightning. Lightning is one of nature’s most destructive events, so it is essential to protect people, the environment and infrastructures from its effects, as well as guaranteeing the continuity of services and safeguarding material and cultural assets.
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