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These studies are generally required on a new construction project per the project specifications, but are often generalized as a “coordination study” by electrical contractors (and others) tasked with installing new equipment on the project. Simply said, the short circuit analysis is done to ensure each piece of electrical equipment is rated to handle the available fault current at the location.
A protective device coordination study refers to a process that engineers use to ensure adjustable protective devices, such as circuit breakers and relays, are set so that only the affected portion of the system is isolated during a fault condition. Lastly, an arc flash incident energy analysis calculates the incident energy—the effective heat produced in cal/cm2—at each equipment location and is used for arc flash labeling and to determine the proper personal protective equipment (PPE) when working on that equipment while it is energized.
To learn more about Eaton’s portfolio of electrical studies and services click here.
In order to complete an arc flash study, you must first model the entire power system using software such as SKM, CYME, Easypower, or ETAP. In this model, you could simply use “as found” settings for all the adjustable protective devices and forgo a protective device coordination study. However, considering the engineering work needed to create a model of the power system, it generally makes sense to use that model to also perform a short circuit study—verify equipment ratings are sufficient to handle the calculated available fault current—and to review the coordination to ensure unnecessary loss of load does not occur in a fault condition. Typically, short circuit analysis, protective device coordination and arc flash incident energy analysis are all completed when an arc flash study is first completed or when it is updated.
Additional information on arc flash solutions and compliance can be found here.
| Item | Description |
| Executive Summary | A synopsis of the key findings and recommendations to improve the safety and operation of the power system |
| One-line Diagram | A model of the entire electrical system which forms the basis for the study |
| Short Circuit Analysis | Calculates available fault current for each piece of electrical distribution equipment in your facility |
| Protective Device Coordination Study | Modeling each protective device and its recommended set points |
| Settings Table | A list of recommended settings for circuit breakers and relays |
| Arc Flash Incident | Used to generate arc flash warning labels showing nominal system voltage and arc flash boundaries, as well as available incident energy and/or PPE category |
| Analysis Input Data | A reference to the data upon which the study was based |
