Which statement is true about arc-blast hazards?

The statement that arc-blast hazards typically result from arcing faults that release high energy in a short time is true. Arc-blast hazards occur when an electrical fault generates a sudden arc, which can lead to explosive releases of energy. This explosive energy is not just about heat; it also primarily involves the rapid expansion of gas from the vaporized metal and insulation materials, creating shock waves and projectiles that can cause serious injuries or damage.

The key characteristic of an arc-blast is the high-energy release in a very short duration, which is why the associated risks are taken seriously in electrical safety protocols. Understanding the nature and impact of these hazards informs proper safety practices and protective measures. Recognizing that arc blasts are violent and rapid phenomena helps workers appreciate the critical need for protective gear, safe work practices, and reliable equipment to mitigate these hazards effectively.