Which statement about arc flash hazard is true?

• A. A dangerous discharge of energy from a fault; reduce risk by de-energizing, PPE, training, and safe work practices.
• B. A resistor used to suppress voltage spikes.
• C. A requirement for maintaining power factor.
• D. A measure of insulation resistance.

Answer: (A)

Arc flash hazard is the dangerous release of energy that occurs when an electrical fault creates an arc between conductors or to ground. The energy released in an arc can cause severe burns, blast damage, and other injuries, so the primary way to reduce the risk is to de-energize the equipment before working. When de-energizing isn’t possible, using appropriate personal protective equipment, receiving proper training, and following safe work practices and procedures becomes essential. The other statements describe concepts that aren’t about arc flash risk: a snubber device suppresses voltage spikes, maintaining power factor is a different efficiency concern, and insulation resistance is about checking insulation integrity, not arc flash hazard.