Which approach boundary should only be crossed by personnel wearing equipment suitable for making contact with energized components?

The correct choice pertains to the Prohibited approach boundary. This boundary is defined as the area immediately surrounding energized electrical components where personnel must not enter unless they are wearing appropriate personal protective equipment (PPE) designed for interaction with live components. The requirement for specific protective gear is crucial because the risk of electrical shock or arc flash is significantly heightened in this area.

Understanding the different boundaries is essential. The Prohibited approach boundary is the most critical zone, where even momentary contact can result in severe injury or fatality due to the high energy levels present. In contrast, the Restricted and Limited approach boundaries involve less immediate risk and have different PPE requirements or may permit entry under certain conditions, such as the use of insulating tools or devices for specific operations by qualified personnel. The Safe approach boundary indicates areas where no special equipment is needed for safe operation, designating it as the least risky environment among the defined boundaries.