Related shock-hazard approach boundaries include the limited and restricted approach boundaries, which refer to closer, more-hazardous distances from electrical equipment that require greater safety precautions in order to operate within. Other standards require all equipment that necessitates an arc-flash boundary to be clearly labeled with information stating what that boundary is, thus enabling a quick understanding of the safe working distance by anyone near the equipment. Both solutions also provide specific obligations for the PPE that must be used by individuals working closer to the equipment than the arc-flash boundary. In lieu of calculating the point at which incident energy will equal 1.2 cal/cm 2, the standard also provides a table-based solution for determining an arc-flash boundary based on the properties of the electrical equipment under consideration. The arc flash hazard analysis is based on IEEE Std 1584-2018 (Guide for Performing Arc-Flash Hazard Calculations). The NFPA prescribes specific calculations for determining the arc-flash boundary under Annex D of this standard. systems, ABB’s comprehensive arc flash hazard analysis is designed to evaluate, analyze and provide recommendations addressing arc flash hazard per National Fire Protection Association’s Standard 70E® (NFPA 70E®-2018). It is an OSHA-recognized consensus standard therefore, the arc-flash boundary has legal weight as a boundary that must be observed in workplaces in order for employers to meet their general duty obligations for workplace safety. If a person were standing at this distance from the arc source, they could receive a second-degree burn. The arc-flash boundary concept is defined by the National Fire Protection Association’s 70E standard. The Arc flash boundary is the distance from a possible arc source to where the incident energy drops to 1.2 calories per square centimeter.
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