The subject of this "NORM" are pipes and fittings made of hard PVC that are buried - without concrete coating (series S and E) or concrete-coated (series U) - and are used to build wastewater systems.
ONORM B 5184-1997 history
1997ONORM B 5184-1997 Pipes and fittings of unplasticized Polyvinylchloride (UPVC) for sewer pipes - Dimensions and specifications - Marking of conformity