![]() Only qualified individuals and escorted unqualified people are allowed to enter a limited space. The second item is the limited approach, which is the distance at which barriers should be placed to protect unqualified personnel from an electrical hazard. People must not cross this boundary unless they are wearing appropriate protective clothing and are under the close supervision of a qualified individual. First is the flash protection boundary, the distance at which the incident energy from the live part is equal to 1.2 cal/cm2 (calories per square centimeter), which is the limit for a second-degree burn on bare skin. When determining what the arc flash boundaries are, the assessment includes three separate items. This risk assessment determines the various arc flash boundaries, as well as the PPE that must be used when approaching each boundary. The National Fire Protection Association’s NFPA 70E contains requirements for performing a shock and arc flash hazard assessment, which involves a calculation performed by a professional engineer to determine the incident energy found at each location. ![]() Three factors determine the severity of an arc flash injury:Īrc flash incidents can result in extreme heat exposure, burns, fires, flying objects and sound blasts. The temperature of an arc flash can reach upwards of four times hotter than the sun! The results can cause serious injury and even death. Arc Flash Protection: Information to Help Keep Workers SafeĪn arc flash is a phenomenon where a flashover of electric current leaves its intended path and travels through the air from one conductor to another, or to the ground. ![]()
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