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Plastics piping systems for non-pressure underground drainage and sewerage. Polypropylene (PP) - Guidance for the assessment of conformity Ingestion-build-141043 It defines the special requirements1 Scope This document gives guidance for the assessment of conformity of materials, products, joints and assemblies in accordance with the applicable part(s) of EN 1852 intended to be included in the manufacturers quality plan as part of the quality management system and for the establishment of certification procedures. NOTE 1 The quality management system is expected to conform to or be no less stringent than the relevant requirements in EN ISO 9001