IEC 62305-2-ed.3.0

Podrobné informace

Označení: IEC 62305-2-ed.3.0

Datum vydání: 12.09.2024

Stran: 256

Země: Mezinárodní technická norma

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Anotace

IEC 62305-2:2024 is applicable to the risk management of a structure due to lightning flashes to earth. Its purpose is to provide a procedure for the evaluation of such a risk. Once an upper tolerable limit for the risk has been selected, this procedure provides a means for the selection of appropriate protection measures to be adopted to reduce the risk to or below the tolerable limit. This third edition cancels and replaces the second edition, published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) The concept of a single risk, to combine loss of human life and loss due to fire, has been introduced. b) The concept of frequency of damage that can impair the availability of the internal systems within the structure has been introduced. c) The lightning ground strike-point density NSG has been introduced replacing the lightning flash density NG in the evaluation of expected average annual number of dangerous events. d) Reduction of a few risk components can be achieved by the use of preventive temporary measures activated by means of a thunderstorm warning system (TWS) compliant with IEC 62793. The risk of direct strike to people in open areas has been introduced, considering the reduction of that risk using a TWS. The content of the corrigendum 1 (2024-10) has been included in this copy. LIEC 62305-2:2024 sapplique a levaluation des risques auxquels une structure est exposee en raison des coups de foudre a la terre. Elle est destinee a proposer une procedure devaluation dun tel risque. Lorsque la limite superieure du risque tolerable est fixee, la procedure permet de choisir les mesures de protection appropriees pour reduire le risque a une valeur inferieure ou egale a la valeur limite tolerable. Cette troisieme edition annule et remplace la deuxieme edition parue en 2010. Cette edition constitue une revision technique. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: a) adoption du concept de risque unique, afin de combiner les pertes de vies humaines et les pertes dues a un incendie; b) adoption du concept de frequence des dommages qui peuvent influencer la disponibilite des reseaux internes a la structure; c) adoption de la densite de points dimpact au sol de la foudre NSG en remplacement de la densite des coups de foudre NG dans levaluation du nombre moyen annuel devenements dangereux previsibles; d) la reduction de quelques composantes de risque peut etre obtenue par lutilisation de mesures preventives temporaires activees par un systeme dalerte aux orages (TWS) conforme a lIEC 62793. Le risque que des personnes soient directement frappees par la foudre dans des espaces ouverts a ete decrit, en tenant compte de la reduction de ce risque au moyen dun TWS. Le contenu du corrigendum 1 (2024-10) a ete pris en consideration dans cet exemplaire.