![]() ![]() While NFPA 110 does allow the use of natural gas for both Level 1 and Level 2 systems, it is key for designers to realize the limitations of gas engines as they relate to the classification of the Emergency Power Supply System (EPSS). Additionally, diesel gensets are capable of accepting loads more quickly than similar sized gas gensets and may be a better option where 10-second start times (e.g. (5.1.1) Diesel fuel is the preferred choice in Level 1 installations where the probability of the interruption of the off-site fuel supplies (i.e. NFPA 110 allows the use of only liquefied petroleum, liquefied petroleum gas, or natural/ synthetic gas for EPS energy sources. The EPS accessories (starting system, control panel, remote annunciator, cooling system, exhaust system, etc.) are also covered. ![]() ![]() ![]() The EPS fuel supply (energy source) and the equipment used to convert the fuel to electrical energy (energy converter) are covered in this chapter. transfer switches, circuit breakers, paralleling switchgear) that distribute the power from the EPS. generator set, fuel supply, and accessories), whereas the Emergency Power Supply System (EPSS) are the components (i.e. The Emergency Power Supply (EPS) is the source of the electrical power and includes everything necessary to generate the power (i.e. Chapter 5 of NFPA 110 covers the equipment that generates the electrical power in emergency and standby power systems. ![]()
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