DIN EN 62305-3:2011-10

DIN EN 62305-3 (VDE 0185-305-3) deals with the protection against physical damage and injury to living beings due to touch and step voltages in a structure and in the vicinity of a structure. The lightning protection system (LPS) is considered the primary and most effective means for protection against physical damage of structures. It usually consists of both external and internal lightning protection systems. An external LPS is intended to: a) intercept a lightning flash to the structure (with an air-termination system); b) conduct the lightning current safely towards earth (using a down-conductor system); c) disperse the lightning current into the earth (using an earth-termination system). An internal LPS prevents dangerous sparking within the structure using either equipotential bonding or a separation distance (and hence electrical insulation) between the external LPS (as defined in 3.2) components and other electrically conducting elements internal to the structure. Main protection measures against injury to living beings due to touch and step voltages are intended to: 1. reduce the dangerous current flowing through bodies by insulating exposed conductive parts, and/or by increasing the surface soil resistivity; 2. reduce the occurrence of dangerous touch and step voltages by physical restrictions and/or warning notices. The type and location of an LPS should be carefully considered in the initial design of a new structure, thereby enabling maximum advantage to be taken of the electrically conductive parts of the structure. By doing so, design and construction of an integrated installation is made easier, the overall aesthetic aspect is improved, and the effectiveness of the LPS can be increased at minimum cost and effort. Access to the ground and the proper use of foundation steelwork for the purpose of forming an effective earth-termination may well be impossible once construction work on a site has commenced. Therefore, soil resistivity and the nature of the earth should be considered at the earliest possible stage of a project. This information is fundamental to the design of an earth termination system and may influence the foundation design work for the structure. Regular consultation between LPS designers and installers, architects and builders is essential in order to achieve the best result at minimum cost. If lightning protection is to be added to an existing structure, every effort should be made to ensure that it conforms to the principles of this standard. The design of the type and location of an LPS should take into account the features of the existing structure. The responsible committee is K 251 "Blitzschutzanlagen und Blitzschutzbauteile" ("Lightning protection systems and lightning protection components") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.