This "inflated" current figure is what determines the final cable size selection from the manufacturer’s tables.
If the calculated $S$ is larger than the selected cable size, the conductor could rupture or weld before the breaker clears the fault. calculation of cable size
In the world of electrical engineering, glamour is often reserved for sleek switchgear, intelligent breakers, and high-efficiency transformers. Yet, the unsung hero of any installation is the humble cable. It is the vascular system of the built environment. When sized correctly, it runs silently and safely for decades. When sized incorrectly, it becomes a ticking time bomb of voltage drops, energy losses, and catastrophic fire hazards. This "inflated" current figure is what determines the