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Lightning Protection – Introduction
Structural lightning protection design considerations BS 6651 (Protection of structures against lightning) clearly advises strict adherence to the provision of a conventional Lightning Protection System (LPS) – to the total exclusion of any other device or system for which claims of enhanced protection are made. Principle components of a conventional structural lightning protection system, in accordance with BS 6651 are: ? Air termination network ? Down conductors ? Earth termination network ? Bonding (to prevent side flashing). Air termination network On high risk structures such as explosive factories, no part of the roof should be more than 2.5m from an air termination conductor. This is generally achieved by applying a 5m x 10m mesh to the roof. However, for most structures, a mesh of 10m x 20m is considered sufficient, giving a maximum distance from any part of the roof to the nearest conductor of 5m. 
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