Which boundary is defined as the distance from exposed energized conductors within which a shock hazard exists?

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

Answer: (A)

When thinking about shock hazards around energized parts, the key idea is that there are defined distances you must respect to avoid electric shock. The boundary that matches the definition “the distance from exposed energized conductors within which a shock hazard exists” is the limited approach boundary. This boundary marks the zone where a shock could occur if you are not insulated or protected, so staying outside it reduces the risk, and crossing into it requires appropriate PPE and protective measures.

It’s helpful to contrast with the other boundaries: the restricted approach boundary is a closer, more hazardous zone that demands even stricter controls and equipment when entry is allowed. The arc flash boundary relates to thermal hazards from an arc flash and is about burn risk, not shock risk. The term “ground boundary” isn’t a standard boundary used for shock protection in this context.

So, the correct concept is that the limited approach boundary defines the distance within which a shock hazard exists around exposed energized conductors.