This Part of EN 1852, together with EN 1046 and EN 1610, provides a set of guidelines for the installation of piping system according to this standard. It is applicable to piping systems made from polypropylene (PP) in the field of non-pressure underground drainage and sewerage - outside the building structure (application area code " U" ) - both buried in ground within the building structure (application area code " D" ) and outside the building. This is reflected in the marking of products by " U" and " UD" .