What potential damage can occur to supply wiring if a 208v unit is connected to a 240v supply?

Connecting a 208v unit to a 240v supply can lead to significant risks because the voltage supplied exceeds the specifications of the equipment. When a higher voltage is applied, this results in increased current flowing through the unit, which can generate additional heat and stress on various components.

Heaters and other electrical components designed for 208v are especially susceptible to damage from the higher voltage, as they may not be rated to handle the excess energy. This can lead to overheating, premature failure of components, and ultimately, significant damage to the equipment. Therefore, it's crucial to match the voltage supply to the manufacturer's specifications to prevent such issues.

In contrast, other options don't accurately describe the consequences of mismatched voltage. For example, reduced performance of equipment may occur, but the more immediate risk is the potential for damage due to excess voltage. Increased efficiency is misleading since the equipment will likely operate poorly or fail. Similarly, stating that there would be no impact contradicts the fundamental principles of electrical engineering where mismatch in voltage can indeed have detrimental effects.