Question 397Electricity & Electronics - Assistant Engineer

The correct answer is C) Provide power to the 450 VAC emergency bus from the emergency generator in the emergency mode. The purpose of the automatic bus transfer device shown in the illustration is to provide power to the 450 VAC emergency bus from the emergency generator when the main power source is lost. This ensures that critical systems and equipment can continue to operate during an emergency situation, even if the main power supply is interrupted. The other answer choices are incorrect because they do not accurately describe the function of the automatic bus transfer device in this specific scenario. The device is not intended to provide power from the main bus to the emergency bus, or vice versa, but rather to connect the emergency bus to the emergency generator when needed.