A three-phase circuit breaker has a \(15.5-\mathrm{kV}\) rated maximum voltage, \(9.0-\mathrm{kA}\) rated short-circuit current, and a 2.50-rated voltage range factor.

(a) Determine the symmetrical interrupting capability at \(10-\mathrm{kV}\) and \(5-\mathrm{kV}\) operating voltages.

(b) Can this breaker be safely installed at a threephase bus where the symmetrical fault current is \(10 \mathrm{kA}\), the operating voltage is \(13.8 \mathrm{kV}\), and the \((\mathrm{X} / \mathrm{R})\) ratio is 12 ?