Which of the following is a key consideration in system design to reduce electrical hazards?

• A. Minimizing clearing times of arcing currents
• B. Maximizing system voltage
• C. Increasing conductor sizes unnecessarily
• D. Reducing protective device coordination

Answer: (A)

Reducing arc flash hazards comes from cutting how long a fault arc can persist. If protective devices trip quickly when an arcing fault starts, the arc energy released into the environment is greatly reduced. Designing for fast, coordinated clearing means a fault is interrupted in the shortest possible time, so workers face much less incident energy and heat exposure. This is why minimizing the clearing time of arcing currents is a central design goal.

The other options don’t address this hazard as directly. Pushing system voltage higher increases the potential energy of an arc, which can raise danger rather than reduce it. Making conductors larger without a reason doesn’t meaningfully lessen arc energy and adds cost. Reducing protective device coordination delays fault clearance, increasing the arc duration and the hazard.