Which voltage level has enough energy to sustain arcing and create severe blast conditions?

• A. 120 volts
• B. 12 volts
• C. 6 volts
• D. 24 volts

Answer: (A)

Arcing requires enough energy to ionize the air and keep a conductive channel open between conductors. The amount of energy available to drive and sustain that arc comes from the voltage and how much current the source can deliver. Higher voltage supplies more energy per unit time, making it easier for the air to break down, the arc to form, and the current to continue flowing. That means the higher the voltage, the greater the potential for a sustained arc and the more severe the blast conditions can be in a fault scenario.

Among the options, the highest voltage carries the most energy to sustain an arc, so it poses the greatest risk for a dangerous arc and blast. The lower voltages don’t provide as much energy to keep the arc going, making severe arcing less likely under typical conditions.