If the source impedance at a \(13.2-\mathrm{kV}\) distribution substation bus is \((0.5+\) j1.5) \(\Omega\) per phase, compute the rms and maximum peak instantaneous value of the fault current for a balanced three-phase fault. For the system \((\mathrm{X} / \mathrm{R})\) ratio of 3.0, the asymmetrical factor is 1.9495 and the time of peak is \(7.1 \mathrm{~ms}\). Comment on the withstanding peak current capability to which all substation electrical equipment need to be designed.