This Technical Specification specifies requirements and gives recommendations for the design, installation and maintenance of fixed deluge water spray systems internal and external to buildings and industrial plant and other premises on land.This Technical Specification covers only the use of the types of sprinklers and sprayers specified in EN 12259-1. The requirements and recommendations of this Technical Specification are also applicable to any addition, extension, repair or other modification to a water spray system.This Technical Specification does not deal with sprinkler systems. It covers the hazards, provision of water supplies, components to be used, installation and testing of the system, maintenance, and the extension of existing systems, and identifies construction details of buildings which are necessary for the satisfactory performance of water spray systems complying withThis Technical Specification. The general principles may well apply to other uses (e. g. maritime use), for these other uses additional considerations will almost certainly have to be taken into account. For water spray systems covered byThis Technical Specification the authority shall be consulted.