For a 4 mm² copper cable, the ampacity depends on several factors, including:
The current-carrying capacity, or ampacity, of a is not a single fixed number; rather, it is a variable value defined by IEC 60364-5-52 . This standard provides a framework for selecting and erecting wiring systems, where the "true" ampacity depends on insulation material, ambient temperature, and how the cable is installed. Ampacity Values for 4 mm² Copper iec 60364 ampacity 4 mm2 copper