Which boundary is the approach limit at a distance from an exposed energized part within which a shock hazard exists?

• A. Limited approach boundary
• B. Restricted approach boundary
• C. Arc flash boundary
• D. Shock hazard boundary

Answer: (A)

Approach boundaries define safe working distances around exposed energized parts to prevent electric shock. The distance at which a shock hazard exists and requires protective measures is the limited approach boundary. This boundary sits farther from the live part than the closer, more restrictive boundary, and it marks the outer limit where shock risk is still present if proper PPE or procedures aren’t used. The arc flash boundary is a separate concept tied to burn hazards from arc flashes, not to shock risk. The restricted approach boundary is the closer, more stringent zone nearer the energized part, where even greater controls are required. In practice, stay outside the limited approach boundary or ensure appropriate protection and procedures before approaching closer.