Be safe, and please reach out to me with any questions you may have. 40 cal/cm2 was often the cutoff for safe work and the highest PPE incident energy level described in 70E until 2018. The process covers the collection of field data if applicable, consideration of power system operating scenarios, and calculation parameters. When working within the arc flash boundary, and when a risk analysis determines that there is a likelihood of occurrence of an arc flash event, then arc flash PPE shall be worn. It is also possible to use custom incident energy level for calculating arc flash boundary. Scope: This guide provides models and an analytical process to enable calculation of the predicted incident thermal energy and the arc-flash boundary. Arc flash boundary is the distance from a prospective arc source at which the incident energy is calculated to be 5.0 J/cm 2 (1.2 cal/cm 2), which is likely to cause the onset of a second-degree burn. Now, with an arc flash label displayed on the equipment and the knowledge to interpret the label, workers can be properly protected from the risk of arc flash and shock. Step 7: Calculate the arc flash boundary. Before this information was required, workers did not always understand the level of risk involved when working on energized electrical equipment. The label is a vital tool to evaluate risk while working on electrical equipment. The importance of the arc flash label and its role in risk assessment and electrical safety can’t be overlooked. This is important to note because any change in equipment, trip settings, or condition of equipment could affect the time it takes to clear a fault, which is one of the most important factors in calculating the incident energy. A disclaimer stating that any changes to settings of breakers or equipment and/or faulty equipment renders the results on the label invalid. ![]() ![]() is an introduction to changes in the new IEEE 1584-2018. Equipment name and source of the equipment feed Use this convenient arc flash calculator to view a sampling of arc flash hazard calculations and the impact of various system changes on arc flash energy levels and personal protective equipment (PPE) requirements.Section 4: Equipment Info and Disclaimer This section references several important pieces of information related to the facility and specific equipment:
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