NFPA 70E QUESTIONS AND ANSWERS RATED A+

NFPA 70E QUESTIONS AND ANSWERS RATED A+ Accessible (as applied to equipment) Admitting close approach; not guarded by locked doors, elevation, or other effective means. Accessible (as applied to wiring methods) Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building. Accessible, Readily (Readily Accessible) Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to take actions such as to use tools (other than keys), to climb over or under, to remove obstacles, or to resort to portable ladders, and so forth. Arc Flash Hazard A source of possible injury or damage to health associated with the release of energy caused by an electric arc. What elements increase the likelihood of an arc flash incident? When energized electrical conductors or circuit parts are exposed or when they are within equipment in a guarded or enclosed condition, provided a person is interacting with the equipment in such a manner that could cause an electric arc. Arc Flash Suit A complete arc-rated clothing and equipment system that covers the entire body, except for the hands and feet. Arc Rating The value attributed to materials that describes their performance to exposure to an electrical arc discharge. This is expressed in cal/cm2 and is derived from the determined value of the arc thermal performance value or energy of breakopen threshold. How is arc rating reported? ATPV (arc thermal performance value) or Ebt (energy of breakopen threshold), whichever is the lower value. Attachment Plug (Plug Cap) A device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle. Authority Having Jurisdiction (AHJ) An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure. Automatic Performing a function without the necessity of human intervention. Balaclava (Sock Hood). An arc-rated hood that protects the neck and head except for the facial area of the eyes and nose. Barricade 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 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. Bonded (Bonding) Connected to establish electrical continuity and conductivity. Bonding Conductor or Jumper A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. Boundary, Arc Flash When an arc flash hazard exists, an approach limit from an arc source at which incident energy equals 1.2 cal/cm2. Stoll Skin Burn Injury Model The onset of a second degree burn on unprotected skin is likely to occur at an exposure of 1.2 cal/cm2 for one second - equals incident energy when an arc flash hazard exists. Boundary, Limited Approach An approach limit at a distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists. Boundary, Restricted Approach 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. Branch Circuit The circuit conductors between the final over-current device protecting the circuit and the outlet(s). Circuit Breaker A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.