If an arc is observed during testing, what immediate actions should you take?

• A. Stop work, back away to a safe distance, reassess risk, and only resume with updated controls, ensuring PPE remains in place.
• B. Continue working with PPE on.
• C. Ignore arc if it seems minor.
• D. Immediately call a supervisor and continue.

Answer: (A)

An arc flash is a sudden, high-energy event that can cause severe burns and blast effects, so any sign of an arc means conditions have changed and you must act immediately to protect yourself and others. The right move is to stop what you’re doing, back away to a safe distance beyond the arc flash boundary, and reassess the risk with the job paused. Only resume when you’ve updated the safety controls to address the new hazard, which may include de-energizing the circuit or adding protective measures, and you should keep wearing the appropriate PPE during the re-evaluation and any subsequent work. The key idea is to treat the observed arc as a warning that the current plan is no longer safe until proper controls and PPE are confirmed and updated.