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An arc flash risk assessment is a process to determine if an arc flash hazard exists. 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.
A complete AR (Arc-Rated) clothing and equipment system that covers the entire body, except for the hands and feet. Arc-Rated apparel is a broad category of clothing designed to protect employees from electrical arc events during completion of energized tasks. (Such a suit typically includes pants, jacket, and a “beekeeper” style hood fitted with a face shield). (see NFPA 70E 130.7(C))
A dangerous condition associated with the possible release of energy caused by an electric arc.
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. This rating is assigned to electrical protective clothing and is normally expressed in calories per square centimeter (cal/cm2). (See NFPA 70E-9)
A distance from an electrical device or system which are used to specify what activities and personnel are allowed, and what personal protective equipment are required within that distance from the electrical device or system. Two independent boundary categories exist: arc flash and shock protection. Within shock protection there are also two boundaries defined: limited approach and restricted approach.
Distance from exposed live parts within which a person could receive a second-degree burn if an electrical arc flash were to occur. This boundary may only be crossed by a qualified person wearing the appropriate personal protective equipment (PPE).
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The shock protection boundaries identified as limited approach boundary and restricted approach boundary shall be applicable where approaching personnel are exposed to energized electrical conductors or circuit parts.
The distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists.
The distance from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock, due to electrical arc-over combined with inadvertent movement, for personnel working in close proximity to the energized electrical conductor or circuit part.
Free from any electrical connection to a source of potential difference and from electrical charge; not having a potential different from that of the earth.
A state in which an electrical conductor or circuit part has been disconnected from energized parts, locked/tagged in accordance with NCSU policy, tested to ensure the absence of voltage, and grounded if determined necessary.
Electrically connected to, or is, a source of voltage.
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