The standard specifies different maximum permissible temperatures ($\theta_f$) depending on the insulation type (e.g., PVC, XLPE, EPR). For instance:
The primary goal of IEC 60949 is to provide a uniform method for determining the maximum current a cable's current-carrying components (such as conductors, sheaths, and screens) can handle for a specific duration. iec 949 pdf work
$$ K = \sqrt\fracQ_c (\beta + 20)\rho_20 \ln \left( \frac\beta + \theta_f\beta + \theta_i \right) $$ iec 949 pdf work
Below is a technical overview and paper outline for the standard's application. 1. Introduction to IEC 60949 iec 949 pdf work
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