Consult standard cable tables (e.g., IEC 60364, NEC Chapter 9, or BS 7671) to find a cable size whose standard current rating is greater than or equal to $I_z$.
(Where $P$ is Power in Watts and $V$ is Voltage in Volts). how to size a cable
A conductor heats up when current flows. Insulation fails above a certain temperature. Ampacity is the maximum continuous current a cable can carry without exceeding its insulation temperature rating. Consult standard cable tables (e
Voltage drop reduces torque in motors, causes flicker in lights, and wastes energy. Insulation fails above a certain temperature
During a short circuit, heat is generated faster than it can dissipate (adiabatic process). The cable must survive until protection clears the fault.
Correct cable sizing involves six interdependent steps:
Some popular cable sizing tables or calculators include: