This part of the standard specifies the characteristics for the fitness for purpose of unplasticized poly(vinyl chloride) (PVC-U) piping systems in the field of water supply. It also specifies the test parameters and test methods referred to in this standard. In conjunction with Parts 1 to 4, 6 and 7 of prEN 1452 it is applicable to joints and assemblies with components of PVC-U, other plastics and nonplastics materials indented to be used for the following: a) water mains and services buried in ground; b) conveyance of water above ground for both outside and inside buildings, for the supply of water under pressure at approximately 20°C (cold water) intended for human consumption and for general purposes. This standard is also applicable to components for the conveyance of water up to and including 45°C. For temperatures between 25°C and 45°C figure A.1 given in annex A of prEN 1452-2 applies.