NFPA 110:2025

Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Application.
1.4 Equivalency.
Chapter 2 Referenced Publications
2.1 General.
2.2 NFPA Publications.
2.3 Other Publications.
2.4 References for Extracts in Mandatory Sections.
Chapter 3 Definitions
3.1 General.
3.2 NFPA Official Definitions.
3.3 General Definitions.
Chapter 4 Classification of Emergency Power Supply Systems (EPSSs)
4.1 General.
4.2 Class.
4.3 Type.
4.4 Level.
Chapter 5 Emergency Power Supply (EPS): Energy Sources, Converters, and Accessories
5.1 Energy Sources.
5.2 Energy Converters.
5.3 Energy Converters — Temperature Maintenance.
5.4 Energy Converters — Capacity.
5.5 Energy Converters — Fuel Supply.
5.6 Rotating Equipment.
5.7 Fuel Cell System Equipment.
Chapter 6 Transfer Switch Equipment
6.1 General.
6.2 ATS Features.
6.3 Requirements for Paralleled Generator Sets.
6.4 Bypass-Isolation Switches.
6.5 Protection.
Chapter 7 Installation and Environmental Considerations
7.1 General.
7.2 Location.
7.3 Lighting.
7.4 Mounting.
7.5 Vibration.
7.6 Noise.
7.7 Heating, Cooling, and Ventilating.
7.8 Installed EPS Cooling System.
7.9 Fuel System.
7.10 Exhaust System.
7.11 Protection.
7.12 Distribution.
7.13 Installation Acceptance.
Chapter 8 Routine Maintenance and Operational Testing
8.1 General.
8.2 Manuals, Special Tools, and Spare Parts.
8.3 Maintenance and Operational Testing.
8.4 Operational Inspection and Testing.
8.5 Records.
Annex A Explanatory Material
Annex B Diagrams of Typical Systems
Annex C Informational References

This standard contains requirements covering the performance of emergency and standby power systems provid‐ ing an alternate source of electrical power to loads in buildings and facilities in the event that the primary power source fails.