Which boundary is designed to prevent a worker from coming into contact with exposed energized parts?

• A. Restricted approach boundary
• B. Limited approach boundary
• C. Proximity boundary
• D. Safe boundary

Answer: (A)

The main idea is that certain distances around exposed energized parts act as protective barriers to prevent contact and reduce shock and arc-flash risk. The boundary designed to stop a worker from coming into contact with those parts is the restricted approach boundary. It marks the minimum distance at which a person could reach and touch energized parts, so access inside this boundary is restricted to qualified personnel using the proper PPE and procedures. If work must be done closer, it requires additional qualifications and protective equipment, ensuring contact is prevented.

The other terms describe different access limits: a boundary that is even more restrictive applies only to authorized individuals and keeps unqualified workers out; a closer boundary for specific tasks requires more PPE; and arc-flash or “safe” boundaries relate to potential energy exposure rather than direct contact risk.