ÖNORM EN 805

This standard specifies general requirements for water supply systems outside buildings including potable water mains and service pipes, service reservoirs, other facilities and raw water mains but excluding treatment works and water resources development ; general requirements for components ; general requirements for inclusion in product standards which may include specifications which are more stringent ; requirements for installation, site testing and commissioning. The requirements of this standard apply to : the design and construction of new water supply systems ; the extension of significant areas forming a coherent part of an existing water supply System ; significant modification and/or rehabilitation of existing water supply systems. NOTE lt is not intended that existing water supply systems are to be altered to comply with this standard, provided that there are no significant detrimental effects an water quantity, security, reliability and adequacy of the supply.