In arc-flash hazard analysis, what factors determine PPE requirements?

• A. To reflect new incident energy, boundaries, labeling, and PPE requirements.
• B. To adjust the color scheme of labels.
• C. The incident energy level, boundaries, and labeling requirements.
• D. To change the make of protective gear.

Answer: (C)

In arc-flash hazard analysis, PPE requirements come from three key pieces of information: the incident energy level, the boundaries, and the labeling on equipment. The incident energy level represents how much heat a worker could be exposed to at a given working distance if an arc flash occurs. This energy value determines the required protection class—what level of PPE, such as flame-resistant clothing, gloves, and face protection, is necessary to keep safe. Boundaries define where that hazard applies and where certain PPE must be worn or a safe approach distance must be respected, helping you know where and how to work. Labels on equipment communicate the exact incident energy and the required PPE category and boundaries, so workers know the protective gear needed before starting work.

Other options don’t fit because changing label colors or simply changing the make of protective gear doesn’t set or communicate the required PPE; and adjusting labels alone doesn’t define the protective needs without the incident energy and boundary context.