The standards or documents are marked “or equivalent” and chosen in the following order of preference:
1° National standards transposing European standards;
2° European Technical Assessments;
3° Common technical specifications;
4° International standards;
5° Other technical reference systems drawn up by European standardisation bodies or, in their absence, national standards, national technical approvals or national technical specifications relating to the design, calculation and execution of works and the use of supplies.
The definition of the standards or other documents mentioned in this article is given in a notice annexed to this code.