This document specifies the safety and performance requirements and tests methods for the components for supply systems. Their intended use is the supply with liquid fuel for one or more consuming units from one or more tanks. NOTE For examples of supply systems see Annex D. This document applies to pressurized, negative pressurized, unpressurised, underground, above ground, inside and/or outside systems to supply liquid fuels. The components for supply systems covered by this document are piping kits/systems and their components. Not covered by this document are items belonging to the consuming unit (e.g.: heating/cooling appliances in buildings) and items used for the mounting and support of components. Not covered by this document are items with the intended use of gas for building heating/cooling systems and any items of heating networks. Not covered are items used for drainage (including highways) and disposal of other liquids and gaseous waste, supply of gases, pressure and vacuum systems, communications, sanitary and cleaning fixtures and storage fixtures.