Nfpa 70E

Arrangement of 70E - correct answer Introduction (Article 90) Chapter 1 Safety Related Work Practices Chapter 2 Safety Related Maintenance Requirements Chapter 3 Safety Requirements for Special Equipment Annexes (Article 350) Arc Flash Hazard - correct answer A dangerous condition associated with the possible release of energy caused by an electric arc Arc Rating - correct answer The value attributed to materials that describes their performance to exposure to an electrical arc discharge. The arc rating is expressed in cal/cm^2 and is derived from the determined value of the arc thermal performance value (ATPV) or energy of breakopen threshold (E BT) (should a material system exhibit a breakopen resoponce below the APTV value). Arc rating is reported as either APTV or E bt, whichever is the lower value. Barricade - correct answer A physical obstruction such as tapes, cones, or A-frame-type wood or metal structures intended to provide a warning and to limit access. Barrier - correct answer A physical obstruction that is intended to prevent contact with equipment or energized electrical conductors and circuit parts or to prevent unauthorized access to a work area. Shock boundaries - correct answer Limited approach boundary, Restricted approach boundary, Prohibited approach boundary (not in 2015) Limited approach boundary - correct answer An approach limit at a distance from an exposed energized electrical conductor or circtuit part within which a shock hazard exists. Restricted approach boundary - correct answer An approach limit at a 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. Arc Flash Boundary - correct answer When an arc flash hazard exists, an approach limit at a distance from a prospective arc source within which a person could receive a second degree burn if an electrical arc flash were to occur. Electrically safe work condition - correct answer A state in which an electrical conductor or circuit part has been disconnected from energized parts, locked/tagged in accordance with established standards, tested to ensure the absence of voltage, and grounded if determined necessary. Hazard - correct answer A source of possible injury or damage to health Incident Energy - correct answer The amount of thermal energy impressed on a surface, a certain distance from the source, generated during an electrical arc event. Incident energy is typically expressed in calories per square centimeter.