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This European Prestandard gives guidance for the assessment of conformity intended to be included in the manufacturer's quality plan as part of the quality system. This prestandard includes: a) requirements for materials, components, joints and assemblies given in Parts 1 to 5 of EN 1452:1999; b) requirements for the manufacturer's quality system; NOTE 1 It is recommended that the quality system conforms to EN ISO 9001 or EN ISO 9002, as applicable. c) definitions and procedures to be applied if third party certification is involved. NOTE 2 If third party certification is involved, it is recommended that the certification body is accredited to EN 45011 or EN 45012, as applicable. In conjunction with Parts 1 to 5 of EN 1452:1999 it is applicable to unplasticized poly(vinyl chloride) (PVC-U) piping systems intended 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 prestandard is also applicable to PVC-U piping systems for the conveyance of water up to and including 45 °C. For temperatures between 25 °C and 45 °C figure A.1 in annex A of EN 1452-2:1999 applies.