For voltages between 15.1 kV and 36 kV, what is the required distance in the Limited boundary?

• A. 3 feet
• B. 4 feet
• C. 8 feet
• D. 6 feet

Answer: (D)

Understanding the limited approach boundary around energized equipment and how the required distance scales with voltage is what this item tests. The limited boundary is a safety zone that keeps unqualified workers at a distance where shock risk and potential arcing are minimized. For voltages in the 15.1 kV to 36 kV range, the standard distance is six feet. That gap provides enough air insulation and reaction time to avoid contact or arc exposure under typical conditions, while still allowing trained personnel to work with proper procedures and PPE when needed. Shorter distances would leave less clearance for safe movement and increase shock or arc hazard risk, whereas longer boundaries would be more conservative than necessary for this voltage level.