Iad=k⋅S⋅1tcap I sub a d end-sub equals k center dot cap S center dot the square root of 1 over t end-fraction end-root
IEC 60949 PDF Work: Understanding Thermally Permissible Short-Circuit Currents
standard (often referred to simply as IEC 949) is the primary international guideline for calculating thermally permissible short-circuit currents