Arc flash hazard study also known as arc flash risk assessment is performed to identify and mitigate the arc flash hazards or arc flash risks available in the system and ensure the safety of the working personnel with proper arc flash safety procedure. Please note that these calculation examples serve as conceptual demonstrations, and actual applications require detailed calculations based on specific power system parameters, equipment characteristics, and standards. Arc flash analysis is a combination of electrical study with ref to the safety guidelines. The specific formula and parameters for safe distance depend on the actual circumstances. Jim is Secretary of IEEE 1584 IEEE Guide for Arc Flash Hazard Calculations and is the Liaison to Geneva, Switzerland based International Electro-Technical Commission’s (IEC) TC78/WG-15 Arc Flash Protection, as well as a member of many other codes and standards committees. Here, Uarc, Iarc, Earc represent arc voltage, current, and energy, while Protection Factors combine various factors related to personnel protection. Safe Distance= f( Uarc, Iarc, Earc,Protection Factors) Human Protection: Determine the safe distance required to protect people.Ĭalculation of safety margins often involves complex electromagnetic and thermal parameters, but in general, variations of the following formulas can be used. This example is based on a medium size enclosure with a 30-kiloampere bolted fault current, 30-cycle arc duration, 32-millimeter conductor gap, 24-inch working distance, and an electrode configuration that is VCBvertical conductor in a metal box. System parameters: including current, voltage, etc.Īrc characteristics: including arc current, voltage, energy, etc. Required steps When calculating arc flash hazard incident energy, IEEE 1584-2018 requires the following steps to be completed. The table above illustrates how the incident energy and arc flash boundary vary with enclosure size. Arc flash boundary calculations are performed to determine the boundaries of potential arc hazards in power systems to ensure that personnel within the hazardous area take appropriate protective measures. Performing Arc-Flash Hazard Calculations.
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