What is the Limited Approach Boundary for movable exposed and potentially energized conductors?

• A. 4 feet from movable exposed and potentially energized conductors
• B. 1 foot from movable exposed and potentially energized conductors
• C. 6 feet from movable exposed and potentially energized conductors
• D. 10 feet from movable exposed and potentially energized conductors

Answer: (D)

Approach boundaries around energized parts are safety buffers used to limit exposure to shock and arc flash. The Limited Approach Boundary is the distance within which approaching the live parts requires a qualified person and protective measures; it defines where extra precautions become mandatory.

For movable exposed and potentially energized conductors, that boundary is 10 feet. This larger distance accounts for the fact that movable conductors can shift or be re-energized unexpectedly, and arc-flash effects can extend outward with little warning. The 10-foot buffer provides a practical margin to avoid contact or exposure while work is planned or performed with proper PPE and procedures.

The smaller distances would not offer enough protection given the possibility of movement and arc-flash energy, so they aren’t appropriate for this scenario.