Differentiate shock hazard from arc flash hazard in electrical work.

• A. Shock hazard involves electric current through the body causing electrocution or burns; arc flash hazard is the energetic release from an arcing fault that can cause burns, blast injuries, and heat exposure.
• B. Shock hazard is only thermal injury; arc flash is only a minor spark.
• C. Arc flash hazard is only a risk to equipment, not to workers.
• D. Shock hazard and arc flash hazard are the same.

Answer: (A)

The key idea is that these are two different ways electricity can harm you. A shock hazard is about current flowing through the body, which can electrocute you or cause burns from the current itself. An arc flash hazard is the sudden release of energy from an arcing fault between conductors or to ground—this can produce extreme heat, a bright flash, blast pressure, and severe burns, even if you aren’t directly touching live parts. So you could be exposed to a dangerous arc without making contact, and you could be at risk from shock even if there isn’t a dramatic arc happening. That’s why this option is the best: it clearly separates the bodily effects of current (shock) from the energetic event of an arc (arc flash) and notes the kinds of injuries each can cause. The other statements mischaracterize either the nature of shock, the reality of arc flash, or claim they’re the same, which isn’t accurate.