): The maximum continuous operating temperature of the cable before the fault occurs (e.g., 90°C for XLPE insulation). Final Temperature ( θftheta sub f
The final relationship can be expressed as:
= Conductor material factor (based on volumetric heat capacity, resistivity, and temperature coefficients). = Cross-sectional area of the conductor or screen ( mm2m m squared = Duration of the short-circuit fault (seconds).
Sites like CableDatasheet provide worked examples and formula breakdowns that are sufficient for most engineering applications.
In conclusion, IEC 60949 is an essential standard for ensuring the safety and reliability of electric cables, wires, and cords. While there are some alternative sources that offer free or low-cost access to the standard, it is recommended to purchase the official standard from the IEC website or authorized distributors to ensure validity, accuracy, and compliance.