OSHA standards for electrical equipment cover which aspects of an electrical installation?

The correct choice highlights that OSHA standards for electrical equipment primarily focus on the exposed or operating elements of an electrical installation. This is crucial because these components pose the greatest risk for electrical shock or accidents. Safety measures are implemented to protect workers from these hazards, ensuring that the parts of the installation that individuals may directly interact with or be exposed to are properly safeguarded, thereby preventing injuries.

The emphasis on exposed elements signifies OSHA's commitment to maintaining high safety standards, requiring that these areas be regularly inspected, maintained, and operated under strict protocols to mitigate risks. Additionally, training and effective communication about the dangers of these exposed elements are vital for the safety of workers.

Other choices fail to encompass the comprehensive approach that OSHA takes on electrical safety. Focusing solely on design, non-exposed elements, or maintenance procedures would not fully serve the purpose of protecting workers who may come into contact with the more hazardous parts of electrical installations. The application of safety measures is fundamentally rooted in the interactive aspects where exposure leads to potential danger.