Within the limited approach boundary for voltages of 15.1 kV to 36 kV, what distance is required to stay away?

• A. 3 feet
• B. 6 inches
• C. 10 feet
• D. 6 feet

Answer: (D)

Six feet from exposed energized parts is required for voltages in the 15.1 kV to 36 kV range. This distance defines the limited approach boundary, a safety line that keeps a worker outside the zone where shock or arc flash hazards become significant for unqualified personnel. At these voltages, the potential for dangerous current and arc energy means you need a practical clearance to prevent reaching the energized parts with your body or a tool. If work must be performed closer than this, it requires a qualified person with proper training, protective equipment, and energy-control procedures. The other distances would place you inside that boundary, increasing the risk, while six feet provides the standard protective gap for this voltage class.