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IEEE 551-2006

Calculating Short- Circuit Currents in Industrial and Commercial Power Systems

This recommended practice provides short-circuit current information including calculated short-circuit current duties for the application in industrial plants and commercial buildings, at all power system voltages, of power system equipment that senses, carries, or interrupts short-circuit currents. Equipment coverage includes, but should not be limited to, protective device sensors such as series trips and relays, passive equipment that may carry short-circuit current such as bus, cable, reactors and transformers as well as interrupters such as circuit breakers and fuses.

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Institute of Electrical and Electronics Engineers [IEEE]


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