WOLE week 2

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harlanjr
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256173
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WOLE week 2
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2014-01-15 23:24:28
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WOLE week
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WOLE week 2
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  1. do personal protective grounds protect from lightning
    no, there is no protection from lightning
  2. define fault current
    the amount of current that a given system can deliver to a fault or short circuit
  3. where is the highest available fault current found
    near the source
  4. how is static charge created on overhead conductors
    warmer winds blowing across the surface of conductors
  5. which method of grounding provides the best protection for linemen
    equipotential zone
  6. what are two main objectives of personal protective grounding
    limit the amount of current flow and voltage drop across the lineworker's body; minimize the time that the current could flow through the lineworker's body
  7. what are 4 sources of induced voltage
    existing energized lines; radio, television, and microwave towers.
  8. a line is not dead until it's _______
    GROUNDED!!!!!!
  9. why is buzz testing not a good method of testing for the presence of voltage
    relies on sound which can be masked, especially on lower voltages.
  10. three testing methods of testing for the presence of voltage
    buzz, neon indicator, and audible tester
  11. what should be done if lightning is present when working on power lines
    cease work
  12. the neutral is considered as an extension of the substation _____ ____
    ground grid
  13. running or traveling grounds are used to protect an employee when conducting what type of work
    stringing wire
  14. OSHA requires personal protective grounding cable to be a minimum of what size
    #2 AWG copper
  15. where is a cluster bracket attached. how does it create a EPZ zone
    the bracket functions as a terminal point for the grounding jumpers and provides contact with the pole to establish EPZ
  16. what potential hazard may be encountered while you are working on a denergized line adjacent to an energized line
    induced voltage
  17. how is static charge created on denergized lines
    warmer winds blowing across the surface of conductors
  18. in order to select grounds for a particular work location, that are large enough to carry the _____ ______ until the circuit protection equipment clears the fault, it is important to know the _____ ______ ______ for that part of the system.
    fault current; fault current levels
  19. fault current is the  _____ __ ______ that a given system can deliver to a fault or short circuit
    amount of current
  20. where are fault currents the highest
    near the source
  21. a potentially hazardous condition that can be encountered by lineworkers or the public where/ when walking may provide a potential for current to flow between two conductive objects to earth can be described as an example of
    step potential
  22. bracket grounding provides
    a low resistance short circuited connection from the line to earth at one or both sides of the work location
  23. this method of grounding is the most effective way of protecting the lineworker in the event the line or equipment becomes energized
    EPZ grounding
  24. describe how EPZ grounding protects the line worker
    diverts or shunts the flow of current around the line worker
  25. name four more common incidents that result in inadvertent energizing of a line
    inadvertent operation of a switch, disconnect etc.; switch accidentally falling closed; generator back feed; line contacts foreign objects
  26. describe the fundamental concept of personal protective grounding
    provides a low resistance path to ground for fault current through grounding devices that are designed to carry high levels of current in the event the line becomes accidentally energized
  27. what does OSHA standard 1910.269(n)(3) state about temporary protective grounds
    temporary protective grounds shall be placed at such locations and arranged in such a manner as to prevent each employee from being exposed to hazardous difference in electrical potential
  28. list the two main objectives of personal protective grounding
    limit the amount of current flow and voltage drop across the lineworkers body; minimize the time that the current could flow through the lineworkers body
  29. is a test probe designed for grounding
    no
  30. steps for installing bracket grounding
    neutral to center phase, center to outside phase, center to inside phase
  31. EPZ grounding provides
    a low resistance short circuited connection from the line to the earth and shunts or diverts the flow of current around the line worker
  32. does it matter which side of the pole EPZ grounds are installed
    no
  33. 5 potential voltage sources
    induced voltage or induction; lightning; capacitance; static charges; inadvertent energizing
  34. 4 sources of induced voltages
    adjacent energized lines; radio; television; microwave towers
  35. what is fault current
    the amount of current that a given system can deliver to a fault or short circuit
  36. where are the fault current levels the highest
    closest to the source
  37. how high can fault voltage levels be
    30,000 amps to 40,000 amps
  38. step potential occurs between
    a workers feet
  39. touch potential occurs between
    a workers hands and feet
  40. a system neutral extends from
    the substation grounding grid
  41. NESC requires that system grounds be placed where on a circuit
    minimum of four times per mile
  42. what is a grounding elbow
    used on 200a bushing to ground underground conductors or devices
  43. what is a portable feed through
    used to isolate, test, and ground an underground cable or circuit
  44. what is a grounded bushing
    one side of a portable feed through; temporary ground for elbows; used to bleed off capacitance
  45. what is a insulated protective cap
    used to cover vacated bushings; it insulates, shields, and seals any load break bushing interface
  46. what is a grounding spike clamp
    penetrating type clamp that is typically utilized to prove that a cable is deenergized at the work location
  47. ground cable length should be short as possible to minimize ________ ______
    whipping effect
  48. OSHA requires that cable used for personal protective grounds never be smaller than
    #2 AWG CU
  49. cluster bracket are used for what type PPE grounding
    EPZ
  50. running grounds are used to
    protect line workers on the ground when stringing conductors
  51. stringing block grounds are used to
    bleed off induction and static when stringing conductors
  52. live front grounds
    have exposed clamps similar to overhead grounds
  53. 5 sources of electric energy
    induced voltage or induction; lightning; capacitance; static charge; inadvertent energizing
  54. 6 ground sources
    substation ground grid; system neutral; static/ shielding wire; driven ground rod; anchor rods; metal structure
  55. grounding clamps form
    the connection between the low resistance grounding cable and the conductor
  56. what does a difference of potential cause
    current flow

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