While the calculations may be close to one another in many situations, this may not always be the case. For a given system location, one can calculate several different values for incident energy levels or for the hazard boundary distance. Even IEEE 1584 presents two alternate calculation methods for many situations-the general equations and the simplified equations for circuit breakers and fuses. In addition to these two methods, there are other methods or tools available for calculation of hazard levels including various Windows and DOS-based shortcut calculator programs, IEEE 1584-based calculators on equipment manufacturer’s web sites, or equipment-specific equations. Short Circuit Study & Protective Device CoordinationĪrc Flash Analysis/Study - IEEE 1584 Update Three of these methods will be examined in this section-the theoretical model, the equations and tables used in NFPA 70E and the calculation methods presented in IEEE Std 1584. The incident energy level could be determined using one of the several arc-flash software programs that are currently available on the market.Īs understanding of the arc-flash hazard has grown, several methods for calculating the hazard have been developed. NFPA 70E doesn't specify that the IEEE Std. 1584, but the latter goes into more detail. The analysis shall determine the Flash Protection Boundary and the personal protective equipment that people within the Flash Protection Boundary shall use.” In addition, IEEE Standard 1584, Guide for Performing An Arc-Flash Hazard Calculations.Īnnex D in NFPA 70E offers the same incident energy level equations that appear in IEEE Std. This is outlined by NFPA 70E Electrical Safety Requirements for Employee Workplaces, states, “A hazard analysis shall be done in order to protect personnel from the possibility of being injured by an arc flash. Arc Flash Calculations are required if you want to determine the incident energy level a worker could be exposed to in calories/cm2.
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