Different standardization channels
Standardization of hydraulic and thermal machines

National standards can be developed in one of three ways.

• International sector

  Any ISO standard can be included in the catalog of French standards, and is then indexed NF ISO XXXX. The same standard adopted by the German member will be called DIN ISO XXXX; it is often in English and sometimes translated into German. This adoption of the international standard at French level is entirely optional and depends on both the content of the standard and the profession concerned.

  As ISO standards are taken over by CEN, this international channel loses its importance.

• European sector

  Under the agreements signed with CEN, all European standards must be adopted in the form of national standards, and in France they carry the index NF EN XXXX. This index enables users to recognize the European origin of the document....