Next time you pick up a cable, remember: the mm² rating is a promise. The resistance table is the proof.
The true heart of the standard is the at 20°C. This prevents manufacturers from using cheap, impure copper or undersized strands. bs en/iec 60228
: It details the requirements for the overall construction of the cable, including the arrangement of conductors, insulation, and any sheathing or armoring. Next time you pick up a cable, remember: