However, based on their usage, they are divided into two different levels.Įmergency power is considered a Level 2 requirement. The NFPA 110 classifies both emergency and standby power systems as Emergency Power Supply Systems (EPSS). In these cases, an ESP-rated generator may then be used as a back up to ensure continued power while your primary source of power is restored. In fact, some locations may rely on a PRP- or COP-rated generator as their primary source of power. This helps to limit the duration of an unexpected outage.)Ĭertain communities may be more remote and do not operate off a power grid. (Most utility power grids are robust, with immediate response teams at the ready when a power outage occurs. In most cases, an ESP-rated generator is recommended. Based on historical data, experts are able to factor this in as a “normal utility outage” when designing an emergency power system. The majority of all industrial buildings are connected to a utility power grid. While we will explain the nuances of these power supplies below, let us get back to the generator ratings. Known as the Standard for Emergency and Standby Power Systems, this document defines which classification is applicable to your building, as well as the devices for which backup power are legally required. The National Fire Protection Association (NFPA) established the NFPA 110. ![]() For example, an industrial building is classified differently than a housing complex, which affects whether you need emergency power or standby power. ![]() Which generator is right for you depends largely on your building’s usage. While emergency and standby power is often used interchangeable, they actually refer to two separate types of power supplies. Prime Power (PRP): PRP-rated generators provide power for varying electrical loads for an unlimited amount of time.Limited-Time Running Power (LTP): LTP-rated generators are those that provide power, for a constant electrical load, for a limited time span.Emergency Standby Power (ESP): ESP-rated generators are those that are used to provide power to a varied electrical load during a normal utility outage.Base Load (Continuous) Power (COP): COP-rated generators are used to provide power, for a constant electrical load, for an unlimited amount of time.Understanding these ratings as you design an emergency power system for your commercial facility is essential to investing in the right generator to support your needs.Ĭummins generators, for example, follow the below ratings: Ratings, regardless of brand, should be clearly defined and stamped onto the identification tag included with each model. Generator ratings define the expected amount of operational time a unit is designed to support. When it comes to potential generators for your commercial facility, there are four basic ratings to choose from. ![]() Understanding the Basics of Generator Rating With so many regulations and factors to consider, professional help is always encouraged.īelow, the experts with Action Services Group provide a basic guide to understanding commercial generators and explain the differences between emergency and standby power. However, understanding what emergency standby power actual means to your company can be overwhelming. ![]() From computers and servers that maintain massive loads of vital data and financial information to manufacturing equipment that generate profits for your company, keeping essential services up and running during a power failure is important. When it comes to commercial facilities, the reliance on utility power is often much heavier than it would be for residential areas.
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