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Arc Flash: The Heat You Can't See Coming
An arc flash is an explosion, not just a shock; keep your distance and never work live without a permit.
Why this matters
- An arc flash happens when electricity travels through the air between conductors. It is not just a small spark; it is a massive release of heat and energy that can cause severe burns without you even touching a wire.
- Working on a live panel is never 'routine'. Even if you have done it a thousand times, one slip of a screwdriver or a bit of dust can trigger a blast hotter than the surface of the sun.
Talking points
- Identify the arc flash boundary marked on the floor or signs and stay outside it unless you are the authorized worker.
- Never open an electrical panel or cabinet unless you are a qualified electrician with a specific permit for that task.
- Always wear the required Arc-Rated (AR) PPE, including specialized face shields and gloves, when the task requires it.
- Use only certified insulated tools designed for electrical work; never use standard hand tools on live equipment.
- Ensure the panel is properly de-energized, locked out, and tested before starting work whenever possible.
- Keep panel doors closed and latched when not actively being worked on to contain any potential internal faults.
- If you see sparks, smell burning, or hear strange buzzing from a panel, stop work and clear the area immediately.
Ask the crew
- If you aren't a qualified electrician, how close should you get to an open live panel?
- Why is a standard high-vis vest not enough protection against an arc flash?
- What should you do if you notice an electrical panel door has been left swinging open?
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