Final answer:
It is important to wait five minutes after isolating a capacitor bank from its primary connections to allow the capacitor to fully discharge and remove any residual charge, reducing the risk of electric shock.
Step-by-step explanation:
The reason for waiting five minutes after isolating a capacitor bank from its primary connections is to allow the capacitor to fully discharge and remove any residual charge. Capacitors store electrical energy, and isolating the primary connections only prevents further charging or discharging. The five-minute wait ensures that the voltage across the capacitor has reduced to a safe level, minimizing the risk of electric shock when working with the capacitor.