14: Emergency Power Supply Systems (EPSS) are among the most critical infrastructure systems in healthcare facilities, yet many generator and emergency power failures can be traced to preventable maintenance, testing, and operational issues. Presented by a nationally recognized emergency power expert and member of the NFPA 110 Technical Committee, this session examines actual EPSS failures encountered in healthcare facilities and the investigations that identified their root causes and corrective actions. The presentation includes a detailed review of the two significant battery-related topics addressed in the 2025 edition of NFPA 110, including the technical basis for the changes, implementation considerations, and their impact on generator reliability. Attendees will gain practical insight into battery monitoring, maintenance, testing, and replacement strategies that can help reduce the risk of emergency power system failures. The session also provides a deep dive into one of the most commonly misunderstood provisions of NFPA 110 Chapter 8—the triennial building load test. Through real-world examples, the presenter will explain the original intent of the requirement, common misapplications observed during compliance reviews, and how improper testing can leave hidden system vulnerabilities undiscovered. Case studies will illustrate how several healthcare facilities might have avoided significant EPSS failures had the triennial testing been performed in a manner consistent with the intent of the standard. Attendees will leave with practical, field-tested knowledge that can be applied immediately to improve emergency power system reliability, strengthen regulatory compliance, and enhance preparedness for utility outages and emergency events. 25: Emergency Power Supply Systems (EPSS) are critical to maintaining life safety and operational continuity in healthcare facilities and other mission-critical occupancies. While electrical riser diagrams often communicate the major components of an EPSS, many design and coordination issues occur beyond the riser and can significantly affect system reliability, compliance, testing, maintenance, and long-term operation. This session explores common oversights during the planning, design, and implementation of EPSS infrastructure. Topics include emergency power generation, system distribution, transfer and switching arrangements, load management, monitoring and control systems, and operational considerations that are frequently overlooked during design. Through real-world examples and lessons learned from completed projects, attendees will gain insight into how design decisions can impact facility operations, regulatory compliance, system resilience, and emergency preparedness. The session will provide practical guidance for engineers, architects, facility managers, contractors, and healthcare owners seeking to improve the reliability, maintainability, and performance of emergency power systems in complex facilities.