Motor 2: 5 hp, 230V, 3-phase: FLC = 15.20A [Table 430.250] Feeder protection [Sec. 430.62(A)] is to be sized no greater than the largest branch-circuit ground-fault and short-circuit overcurrent ...

Examples of these situations are motor starts or line-to-line faults. Ground-fault element operation is undesirable in both of these cases. Fig. 2. These current waveforms were captured during an ...