![]() ![]() For many facilities, this will mean collecting all the data needed to build an up-to-date one-line diagram.įor facilities with a recent short circuit study, it may mean:Įxtending the existing study to include control equipment. It's essential to model the system in detail to get a reasonable assessment of the arc flash hazard. The data needed for an arc flash hazard analysis is similar to that needed for a short circuit and coordination study. Step 1: Collect System and Installation Data Be sure to read the cautions and disclaimers carefully.įor information about calculating short circuit currents and performing an overcurrent protective device coordination study, the guide refers to the IEEE Red Book and IEEE Buff Book. Section 4 also suggests a nine-step approach to arc flash hazard analysis. Section 4 of IEEE 1584-2002, Guide for Arc Flash Hazard Calculations, states that the results of the arc flash hazard analysis are used to "identify the flash-protection boundary and the incident energy at assigned working distances throughout any position or level in the overall electrical system." The Nine Steps of Arc Flash Hazard Analysis Show more The Nine Steps of Arc Flash Hazard Analysis Such an analysis gives you data you can use to improve overall system performance, reduce downtime and manage costs. Performing an analytical arc flash hazard analysis provides you an additional benefit: an in-depth look at your plant's electrical system. ![]() Selection of PPE can be by an Analytical Incident Energy Analysis or by using the Hazard/Risk Categories in the tables of Article 130.7. This selection is to be based on the incident energy present at the working distance for the task to be performed, as described in Article 130.5(B) and Article 130.7. The personal protective equipment (PPE) and protective clothing necessary, for workers within the arc flash boundary.Article 130.5(B) indentifies the working distance as the distance from a prospective arc source to the worker's chest and face areas. The incident energy at the expected working distance.The arc flash boundary, defined in Article 130.5(A) as the distance at which the incident energy equals 1.2 cal/cm2 "an approach limit within which a person could receive a second degree burn if an electrical arc flash were to occur.".According to NFPA 70E Section 130.3, the goal of arc flash hazard analysis is to identify: ![]() Part of an electrical hazard analysis is an arc flash hazard analysis. This includes work required to deenergize the equipment. NFPA 70E 130.3(B)(1) requires that an electrical hazard analysis be performed to ensure that workers are properly protected whenever they are exposed to electrical hazards from work on or near equipment that is not in an "electrically safe condition" (see NFPA 70E Article 120 for guidance on putting equipment in an electrically safe condition). ![]()
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