Arc Flash Terminology

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Across
  1. 2. Person. One who has demonstrated skills and knowledge related to the construction and operation of electrical equipment and installations and has received safety training to identify and avoid the hazards involved.
  2. 5. 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.
  3. 6. The amount of current delivered at a point on the system during a short circuit condition.
  4. 7. Connected to establish electrical continuity and conductivity.
  5. 9. An overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of overcurrent through it.
  6. 10. Short-Circuit Current. The highest level of fault current that could theoretically occur at a point on a circuit. This is the fault current that can flow in the event of a zero impedance short circuit and if no protection devices operate.
  7. 13. A conducting object through which a direct connection to earth is established.
  8. 18. Room. A room specifically intended for the installation of batteries that have no other protective enclosure.
  9. 20. Voltage. The value assigned to a cell or battery of a given voltage class for the purpose of convenient designation; the operating voltage of the cell or system may vary above or below this value.
  10. 22. Abbreviation of an assembly of one or more enclosed sections having a common power bus and principally containing motor control units.
  11. 23. Electrically connected to, or is, a source of voltage.
  12. 24. Equipment designed to withstand the effects of an enteral arcing fault and directs the internally released energy away from the employee.
  13. 26. Cell. One or more cells chosen to represent the operating parameters of the entire battery (sometimes called “temperature reference” cell).
  14. 28. Abbreviation of a device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device.
  15. 30. Front – Without live parts exposed to a person on the operating side of the equipment
  16. 31. All circuit conductors between the services equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device
  17. 32. Safe Work Condition. De-energized, disconnected, LOTO, tested, and grounded
  18. 33. An approach boundary limit at a distance from an exposed live part within which there is an increased risk of shock due to electrical arc-over combined with inadvertent movement for personnel working in close proximity to the live part
  19. 35. A dangerous condition such that contact or equipment failure can result in electric shock, arc flash burn, thermal burn, or blast.
Down
  1. 1. A device designed to open and close a circuit by non-automatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.
  2. 3. A system consisting of two or more electrochemical cells connected in series or parallel and capable of storing electrical energy received and that can give it back by reconversion.
  3. 4. Free from any electrical connection to a source of voltage.
  4. 8. A type of cell in which the products of electrolysis and evaporation are allowed to escape freely into the atmosphere as they are generated. (Also called “flooded cell.”)
  5. 11. Assessment. An overall process that identifies hazards, estimates the potential severity of injury or damage to health, estimates the likelihood of occurrence of injury or damage to health, and determines if protective measures are required.
  6. 12. Circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)
  7. 14. The value attributed to materials that describes their performance to exposure to an electrical arc discharge.
  8. 15. A ground potential gradient (difference) that can cause current flow from hand to hand or hand to foot through the body.
  9. 16. A solid, liquid, or aqueous immobilized liquid medium that provides the ion transport mechanism between the positive and negative electrodes of a cell.
  10. 17. Near (Live Parts). Any activity inside a Limited Approach Boundary
  11. 19. Lead Acid (VRLA) Cell. A lead-acid cell that is sealed with the exception of a valve that opens to the atmosphere when the internal pressure in the cell exceeds atmospheric pressure by a pre-selected amount, and that provides a means for recombination of internally generated oxygen and the suppression of hydrogen gas evolution to limit water consumption.
  12. 21. Operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating.
  13. 25. A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.
  14. 27. Potential. A ground potential gradient (difference) that can cause current flow from foot to foot through the body
  15. 29. The basic electrochemical unit, characterized by an anode and a cathode used to receive, store, and deliver electrical energy.
  16. 34. Suitable for carrying electric current