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This document gives guidance for the assessment of conformity of materials, products, joints and assemblies in accordance with the applicable part(s) of EN 13476 intended to be included in the manufacturer’s 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 to EN ISO 9001 [1]. NOTE 2 If third-party certification is involved, the certification body can be accredited to EN ISO/IEC 17065 [2] or EN ISO/IEC 17021 [3], as applicable. NOTE 3 In order to help the reader, a basic test matrix is given in Annex A. In conjunction with EN 13476-1, EN 13476-2 and EN 13476-3 this document is applicable to Plastics piping systems for non-pressure underground drainage and sewerage — Structural-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE): — for non-pressure underground drainage and sewerage outside the building structure (application area code “U”) reflected in the marking of products by “U”, and — for non-pressure underground drainage and sewerage for both buried in ground within the building structure (application area code “D” and outside the building structure (application area code “U”) reflected in the marking of products by “UD”.