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IEC 60949 is an international standard for "Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects". It's a technical standard published by the International Electrotechnical Commission (IEC) that provides guidelines for calculating short-circuit currents in electrical systems. For professional use, investing in the official document
: It defines the maximum current a conductor can carry for a specific duration based on its initial and final temperatures. Application
Unlike simpler standards that assume no heat escapes the conductor during a fault (adiabatic), IEC 60949 accounts for heat dissipation into the surrounding insulation, allowing for more accurate (and often higher) current ratings. Formula Components: Calculations typically involve: : Permissible short-circuit current. : Duration of the short circuit (seconds).
