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This Part of EN 1451 gives guidance for the assessment of conformity 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 EN 1451-1; b) requirements for the manufacturer's quality system; NOTE 1 It is recommended that the quality system conforms to EN ISO 9001, 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. This Part of EN 1451 is applicable to solid-wall piping systems made of polypropylene (PP) in the field of soil and waste discharge (low and high temperature) - inside buildings (application area code "B") and - inside buildings and buried in ground within the building structure (application area code "BD").