Which of the following best summarizes the electrical safety practices for high voltage equipment in base facilities?

• A. Lockout/Tagout and training only
• B. PPE and safe work procedures
• C. Arc flash risk assessment per NFPA 70E and PPE only
• D. Lockout/Tagout, training, proper clearance, use of qualified personnel, arc flash risk assessment per NFPA 70E, PPE, and safe work procedures

Answer: (D)

High voltage safety comes from a layered approach that combines administrative controls, engineering controls, and well-defined procedures. Isolating the energy with lockout/tagout, ensuring workers are trained and authorized, and enforcing proper clearance and boundary controls are admin and procedural safeguards that prevent unexpected energization and close contact. Using qualified personnel guarantees that those performing the work have the specific knowledge and skills for high-voltage tasks. An arc flash risk assessment per NFPA 70E identifies the potential incident energy and informs the appropriate PPE and work practices, which protects workers from arc flash injuries. Safe work procedures tie all these elements together into a repeatable, hazard-aware process that governs how tasks are planned and executed.

This comprehensive combination—lockout/tagout, training, proper clearance, qualified personnel, arc flash risk assessment per NFPA 70E, PPE, and safe work procedures—is why it’s the best choice. The other options miss one or more essential components, such as not addressing energy isolation, training, clearances, or the formal arc flash assessment that drives PPE and procedures.