The document serves a singular, vital purpose: it provides the formulas, tables, and methodologies required to calculate the short-circuit currents that insulated power cables can withstand. When a fault occurs in an electrical system—such as a short circuit—the temperature of the conductor rises rapidly. If the cable cannot handle this thermal surge, the insulation will melt or degrade, leading to system failure or fire.

The physical limit of a cable is determined by its insulation material. Exceeding the short-circuit temperature ( T2cap T sub 2