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This document gives guidance for the assessment of conformity of materials (formulations), products and assemblies in accordance with EN 1329-1 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 It is advised that the quality management system conforms to or is no less stringent than the relevant requirements to EN ISO 9001 [2]. NOTE 2 If certification is involved, it is advised that the certification body is preferably compliant with EN ISO/IEC 17065 [6] or EN ISO/IEC 17021-1 [4], as applicable. NOTE 3 In order to help the reader, a basic test matrix is given in Annex A. In conjunction with EN 1329-1, this document is applicable to piping systems made of unplasticized poly(vinyl chloride) (PVC-U) intended to be used for the following purposes: — for soil and waste discharge systems (low and high temperature) inside buildings (application area code "B"); — for soil and waste discharge systems (low and high temperature) for both inside buildings and buried in ground within the building structure (application area code "BD"). NOTE 4 This is reflected in the marking of products by "B" or "BD".