According to OSHA, personal protective grounds must be applied to create what protective measure?

The correct choice emphasizes the importance of creating an equipotential zone when applying personal protective grounds according to OSHA standards. An equipotential zone is established to ensure that all points within that area maintain the same electrical potential, which significantly reduces the risk of electric shock for personnel working on or near electrical systems.

By grounding equipment and providing a safe environment where the electrical potentials are equalized, workers are protected against the dangers of step and touch potentials, which can occur if there are differences in electrical potential between two points. This is particularly critical when working with high voltage systems, as the potential for electric shock increases considerably.

In contrast, options that refer to an isolation zone, safety barrier, or warning zone do not directly address the specific protective measures provided by personal protective grounds. While these zones may have their own safety functions, they do not create the necessary equipotential environment required for the protection of workers from electrical hazards.