: Material constant (e.g., 226 for Copper, 148 for Aluminum). : Initial and final temperature limits (°C).
): This assumes all heat generated by the fault remains within the conductor. Iec 60949 Pdf Free Download
I=IAD⋅εcap I equals cap I sub cap A cap D end-sub center dot epsilon Where to Access IEC 60949 Documents : Material constant (e
While full, official copies require purchase, you can find detailed summaries and partial previews at these locations: IEC 60949:1988 I=IAD⋅εcap I equals cap I sub cap A
): The final rated current is found by multiplying the adiabatic current by the non-adiabatic factor.
IEC 60949:1988 (including Amendment 1:2008) is the international standard for calculating . Unlike simpler methods that assume no heat escapes the conductor (adiabatic), IEC 60949 provides a way to account for non-adiabatic heating effects , where some heat is absorbed by surrounding materials like insulation or sheaths. Key Formulas and Calculation Methods