The maximum possible short-circuit current for a motor can be estimated by multiplying the total motor current in amps by a factor of 4 to 6, which are commonly accepted values1. The actual short-circuit current depends on factors such as the motor type, its impedance, and the system configuration. For synchronous motors, the short-circuit contribution can last from six to eight cycles2. It is essential to consider the maximum possible short-circuit current when designing motor circuits and selecting protective devices to ensure adequate protection against short circuits and overloads3.
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