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Arc flash is a constant hazard when discussing industrial safety, however, little is known about the arc flash. Current safety standards require the use of the NFPA 70E equation to establish safety limits for arc flash hazards. However, when compared to an empirically derived model, these safety limits are much too low to account for all working conditions. A comparison of these two methods will lead to the conclusion that arc flash safety distances must be increased. 1. Introduction. In industrial electrical safety, arc flash hazards can be some of the most disastrous and deadly accidents in the work place. An arc flash can reach temperatures of over 35000 degC and cause an explosion with a blast force of 2000 psi and an audible report of over 140 decibels. At a current of just 0.5 Amps, an electrical shock, such as the shock generated from an arc flash, will stop the heart of an adult. [1]. Current arc flash safety codes require that the worker be at a distance that, if an arc flash were to occur, would only result in 2nd degree burns. The current accepted standard for arc flash energy calculations is given by the NFPA 70E equation, which was derived experimentally. However, an empirical approach to determining arc energy will be derived in this paper and the results compared and examined.

An Empirically Derived Arc Flash Discharge Energy Model and Comparison to Established Safety Codes