There are two boundary categories: the arc flash boundary and the shock protection boundaries. (see 2018 NFPA 70E-100) Boundary:Ī distance from an electrical device or system used to specify what activities are allowed, and what personal protective equipment is required within that distance from the electrical device or system. Flame resistant clothing, without an arc rating, has not been tested for exposure to an electric arc. Note: An arc rating indicates the clothing or equipment has been tested for protection against exposure to an electric arc. ![]() This rating is assigned to electrical protective clothing and is normally expressed in calories per square centimeter (cal/cm2). The maximum incident energy resistance demonstrated by a material (or a layered system of materials) prior to “breaking open” or at the onset of a second-degree skin burn. , “ Electrical Personal Protective Equipment.” Arc Rating: Note: Protective apparel for other body parts, including hands, feet, and hearing is also required. (Such a suit typically includes pants, jacket, and a “beekeeper” style hood fitted with a face shield). Arc Flash Suit:Ī complete AR (Arc-Rated) clothing and equipment system that covers the entire body, except for the hands and feet.Īpparel is a broad category of clothing designed to protect employees from electrical arc events during completion of energized tasks. If it does, the risk assessment shall determine the appropriate safety-related work practices, the arc flash boundary, and the personal protective equipment (PPE) to be used within the arc flash boundary. For more detailed definitions, refer to 2018 NFPA 70E, Article 100.Īn arc flash risk assessment is a process to determine if an arc flash hazard exists. The following terms are defined to allow a better understanding of this program.
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