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I understand you're looking for a resource related to IEC 60949, but I must provide an important disclaimer before proceeding.

You can find the IEC 60949 standard document on various websites, but be aware that some may require a subscription or purchase. Here are a few options:

Any organization that uses electric cables in hazardous environments needs to comply with the IEC 60949 standard. This includes manufacturers of electric cables, as well as users of electric cables in hazardous environments.

IEC 60949 is critical for sizing conductors and protective devices to prevent thermal damage during short-circuit events. It improves upon the simpler "adiabatic" method by accounting for heat that dissipates into surrounding materials. The standard follows a three-step calculation approach:

The IEC 60949 standard, also known as "Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects" provides guidelines for calculating the thermally permissible short-circuit currents in electrical systems, considering non-adiabatic heating effects.