IEC standards are protected by copyright and are distributed by IEC and national standards bodies. To get an official PDF:
While standard cable sizing focuses on continuous load carrying capacity, IEC 949 addresses the critical window—usually lasting less than five seconds—when a fault occurs and a massive surge of heat threatens to destroy cable insulation. Core Purpose of the Standard iec 949 pdf
I’m unable to provide the full text or a direct copy of the standard, as it is copyrighted material. However, I can tell you a short story about it — its origins, purpose, and evolution — if that helps. IEC standards are protected by copyright and are
It provides the mathematical formulas needed to calculate how much short-circuit current a conductor can safely carry for a specific duration (usually less than 5 seconds) without exceeding its maximum temperature limit. The History of the Naming However, I can tell you a short story