How should a worker protect themselves from arc flash when opening a panel?

• A. Stand on a damp floor without PPE.
• B. Wear PPE appropriate for the incident energy, maintain distance, use insulated tools, stand on an insulating mat if required, and use a barrier.
• C. Wear only gloves.
• D. Stand as close as possible to observe.

Answer: (B)

Opening a panel with potential arc flash requires a layered protection approach. The worker should be protected by PPE that is rated for the incident energy expected from the equipment, while also applying distance, using insulated tools, and controlling the work area. Wearing PPE matched to the incident energy, staying back from the panel, using insulated tools to prevent conductive paths, standing on an insulating mat if the surface is conductive, and using a barrier to keep others out all work together to limit radiant heat, arc blast force, and potential current transfer. This combination directly reduces the energy reaching the worker and lowers the likelihood and severity of injury. In contrast, standing on a damp floor without PPE, wearing only gloves, or standing very close to observe keep the worker exposed to severe heat, shock, and flying debris, which is why those options are unsafe.