The calculation of the short-circuit capacity of a power system is very involved and complex. To avoid damage from excessive heat and the magnetic force created by a short circuit, all electrical circuits, and equipment connected to the system must have an interrupting rating or interrupting capacity, equal to or greater than the calculated short-circuit capacity of the system. Furthermore, there will most likely be the fire of combustible components within or in the vicinity. This situation is called a short circuit.ĭepending on the remaining resistance or impedance of the circuit, the short-circuit current could be up to 30 times as high as the normal current.Īt this abnormally high level, most equipment and wiring will be ruined by the excessive amount of heat generated. If the resistance or impedance of the load is bypassed or shorted, then, according to Ohm’s law, an abnormally high current will flow through the circuit.
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