Which maintenance practice is required for electrical systems under NFPA 99?

Periodic testing and inspections are critical maintenance practices required for electrical systems under NFPA 99. This standard emphasizes the importance of ensuring that electrical systems are functioning safely and efficiently at all times. Regular testing and inspections allow for the identification of potential issues before they lead to unsafe conditions, ensuring compliance with safety codes and standards.

These practices also help in monitoring the performance of electrical systems over time, allowing for timely maintenance and repairs rather than waiting for a failure to occur. This proactive approach minimizes downtime and enhances the overall reliability of the electrical systems within healthcare facilities, which is vital for patient safety and operational efficiency.

In contrast, other options do not align with the proactive maintenance philosophy outlined in NFPA 99. Annual repairs may not be necessary if systems are functioning properly, preparing for inspections only when necessary could lead to potential safety hazards, and replacing all old wiring is not a practical or cost-effective strategy compared to assessing the condition of wiring and only replacing it when issues are identified.