What are a few examples of 'category dangerous' locations?

• A. Outdoor lighting panels.
• B. Primary side HV substations.
• C. Office break rooms.
• D. Secondary side LV (480) substations.

Answer: (D)

Category dangerous locations are places where workers can be exposed to live electrical parts and arc flash hazards. In low‑voltage work, a typical example is the secondary side of distribution equipment where 480 V live parts, such as bus bars, breakers, and feeders, can be accessible during maintenance. That exposure creates immediate shock or arc risk, so secondary side LV substations clearly fit the idea of a dangerous area.

Outdoor lighting panels are usually enclosed and not readily exposed to energized parts, and office break rooms contain no energized equipment, so they’re not considered dangerous in this context. Primary side HV substations are indeed dangerous, but this question focuses on commonly encountered LV locations, making the secondary LV substation the best example of a category dangerous location. Always treat any accessible live parts with appropriate procedures and PPE.