Which boundary is closer to the energized conductor: Restricted Approach Boundary or Limited Approach Boundary?

• A. Limited Approach Boundary
• B. Restricted Approach Boundary
• C. Arc Flash Boundary
• D. Insulation Boundary

Answer: (B)

Boundaries around energized parts set safe distances to prevent shock and arc-flash injuries. The restricted approach boundary is the inner boundary closest to the live conductors; it represents the highest risk zone where contact with energized parts could occur. Crossing this boundary requires the most protective measures and procedures, so it sits right up near the energized equipment. The limited approach boundary is farther away from the live parts, marking a less restrictive zone where you still need protection and training, but not the same level of contact risk as inside the restricted boundary. Therefore, the boundary that is closer to the energized conductor is the restricted approach boundary.