THE NO-NONSENSE GUIDE TO NFPA 110 COMPLIANCE
Emergency power supply system (EPSS) Your emergency power supply system (EPSS) refers to your functioning backup power system in its entirety. It includes the EPS,
Your emergency power supply system (EPSS) refers to your functioning backup power system in its entirety. It includes the EPS, transfer switches, load terminals and all the equipment required to provide a safe and reliable alternative source of power for your facility (3.3.4).
This includes the generator and all electrical distribution equipment that is part of the emergency system, transfer switches, feeders, panel boards, fuel tanks, and controls. In addition, all critical equipment that the emergency power system supplies must be elevated. Flood risk considerations should not be limited to the emergency power systems.
The emergency power distribution system includes all wiring and equipment between the emergency or alternate power sources and the critical equipment the sources supply.
In this document, the terms emergency power, alternate power, and standby power systems are used. These include: Systems required by building codes and standards to supply life-safety equipment, equipment that reduces hazards, and equipment that helps rescue or fire-fighting operations. damage when power is lost.
One piece of critical equipment is assumed to draw little power (e.g., a computer for HVAC controls) and can be supplied from the emergency branch circuit panelboard; the other critical equipment is assumed to draw more power (e.g., a sanitary sewer lift pump) and is fed from the higher capacity emergency distribution panel.
The key to understanding the requirements outlined in NFPA 110 lies in acquainting yourself with the way emergency power supply systems (EPSS) are classified: By Level, Class and Type. Dictates performance standards your system needs to follow. Duration your system must be able to run without refueling.

Emergency power supply system (EPSS) Your emergency power supply system (EPSS) refers to your functioning backup power system in its entirety. It includes the EPS,
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