Refer to a standard Ampacity Chart (such as BS 7671 or NEC tables) to find a cable size with a tabulated current rating ( Itcap I sub t ) that meets or exceeds your calculated Izcap I sub z
is resistance per km. If the drop exceeds , you must choose a larger cross-sectional area ( mm2m m squared 🌍 Advanced Mechanical Calculations cable calculation
For single-phase AC or DC circuits: $$I_b = \frac{P}{V \times \text{Power Factor}}$$ Refer to a standard Ampacity Chart (such as