![]() Use the proper protective clothing to keep your workers safe in the field. ![]() Refer to this information when selecting safety workwear for your team. Marks the piece of equipment that is associated with the arc flash or shock hazard. Sets the minimum rating for arc flash clothing necessary to protect workers when they are in an arc flash boundary. Sets a limit on the distance from an exposed energized electrical conductor or circuit part where there is a greater risk of shock hazard based on the electrical arc-over combined with inadvertent movement. Shows the minimum approach distance from an exposed energized electrical conductor or circuit part, both of which could be a shock hazard. Shows the nominal value of the voltage system in place. Measures the minimum distance from the worker’s face or chest area to arc source, so they can keep a safe distance. Remember that the incident energy decreases as the distance from the source increases. This represents the amount of thermal energy impressed on a surface in the event of an electrical arc fire, based on its distance from the arc source. ![]() This measures the amount of energy necessary to pass through the given fabric to cause a 50% probability of second-degree burns, represented in calories/cm2. The Arc Flash Boundary determines the distance from the equipment at which the Incident Energy of an arc flash would be 1.2 cal/cm². This category stipulates the minimum amount of PPE necessary to protect the worker from permanent injury once they step inside the arc flash boundary. The Arc Flash Boundary has been developed by NFPA70e to minimize the risk of arc flash injury to electrical workers, working in proximity to energized electrical equipment. Anything inside of this boundary could result in permanent injury, including a second-degree burn or worse. This represents the shortest possible distance in which workers must stand away from the hazard in question when they are not wearing arc flash clothing. Anything below these levels receives a “warning” label, which appears in orange. It means that the nominal system voltage is over 600 or that the incident energy is over 40 calories per square centimeter (cal/cm2). The label will feature a “warning” or “danger” heading. It comes with important safety information about the type of threat or hazard in question, so workers can either avoid this area or make sure they are wearing the proper arc flash clothing before accessing equipment or stepping inside. An arc flash warning label is commonly used to alert workers of a potential flash fire.
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