Week 7

Card Set Information

Week 7
2013-06-19 00:26:12

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  1. Who was Andre' Ampere?
    • 1775-1836
    • Laid the foundation for electrodynamics.
    • French physicist that demonstrated electric currents produce magnetic fields.
    • Demonstrated the direction of the magnetic field is determined by the direction of the current.
    • Developed a quantitative relationship for the strength of a magnetic field in relation to an electric current.
    • Developed a theory as to how iron becomes magnetized.
    • Developed Ampere's Law.
    • Defined the Amp, or the unit of measure of current.
  2. What did Andre' Ampere demonstrate in 1814?
    A magnetic needle moves in the vicinity of electric current.
  3. A quantity measurement of electrons.
  4. How many electrons are there in one coulomb?
    • 6,250,000,000,000,000,000
    • 625 with 16 zeros behind it.
  5. One coulomb per second.
  6. The measurement of the amount of electricity flowing through a circuit.
  7. What tool would be used to determine the amount of current flow?
  8. Conductors are rated for __________.
  9. If the amperage rating of a wire is exceeded the wire will _____.
  10. Stranded wires will allow ________ a.c. current to flow.
  11. Current is a chain reaction of ______ striking one another.
  12. If a wire was wrapped around the earth 10 times, a bulb would illuminate __________ a switch was turned on.  It would take light ______ to travel that far.
    • at the same time
    • 1.3 seconds
  13. Who was Georg Simon Ohm?
    • 1787-1854
    • Erlangen, Germany
    • His work as a physicist resulted in the discovery of Ohm's Law in 1827.
  14. One Ohm is equal  to that of a conductor in which a current of one ampere is produced by a potential of _______ across it's terminals.
    one volt
  15. The unit of measure for resistance.
  16. When resistance is high in a conductor, greater friction is created, what are the by-products of friction?
    Heat and light
  17. Who was James Watt?
    • 1736-1800
    • Invented the steam engine.
    • Invented the horsepower to bill customers for the use of his steam engine.  They had to pay 1/3 of what it would cost to maintain the same number of horses that would be required to do the same work.
  18. A measure of electrical power.
  19. The product of volts times amps.
  20. The measurement of voltage and amperage over time.
  21. Power companies bill their customers by the _________.
  22. One horsepower is equal to ___ watts.
  23. On the electrical quantities wheel, E stands for?
    Electromotive force, or voltage.
  24. On the electrical quantities wheel, I stands for?
    Intensity of current, or amperage.
  25. On the electrical quantities wheel, R stands for?
  26. The mathematical equation that describes the relationship between voltage, amperage, and resistance.  If any one of the three is changed it affects the others.
    Ohm's Law
  27. The opposition to current flow in an electrical circuit.
  28. The amount of work that can be done by a load in some standard amount of time.
  29. What is the unit of measure for power?
  30. On the electrical quantities wheel, P stands for?
    Power, or watts.
  31. What is the golden rule for grounding procedures?
    When installing grounds, always connect to the ground source first and then connect to the conductor or equipment with a live-line tool.  When removing the tools, the reverse order should be followed.
  32. Personal protective grounds should be installed as ____ from the pole as possible to prevent a _____ hazard.
    • far
    • whipping
  33. Always ensure the jumpers are rated for the __________ of the particular line being worked on.
    fault current
  34. The ___________ should not be violated until the grounds are properly installed.
    minimum approach distance
  35. What are the three key questions you should ask regarding personal protective grounds?
    • Are the jumpers placed as far from the pole as possible?
    • Is the jumper length minimized?
    • Are the jumpers of adequate size regarding fault current?
  36. How can you determine if a guy wire is a foreign ground or not?
    If it has an insulator that is below the work area, it is not a foreign ground.
  37. What are the six steps to install EPZ grounds?
    • Step 1 - Test all phases for voltage.
    • Step 2 - Clean all conductors with wire brush.
    • Step 3 - Install cluster bracket and connect to ground source.
    • Step 4 - Connect jumper to cluster bracket first, and then to any phase using live-line tool.
    • Step 5 - Connect jumper to grounded phase and then to next closest phase.
    • Step 6 - Connect jumper to grounded phase, and then to next closest phase.
  38. A ground connection consisting of a temporary ground rod and a grounding cable that is attached to the base of a steel tower.
    Butt Grounding
  39. Given watts, you would ______ by 746 to get HP.
  40. Given HP, you would _____ by 746 to get watts.
  41. How does an ammeter work?
    It measures the magnetic field and converts it to amperage.
  42. An ammeter is placed _____ or _____ to get a measurement.
    • in-line
    • series
  43. A 100 watt light bulb draws?
    1 amp
  44. One megawatt is equal to how many watts?
    One million
  45. On average, how many homes can be powered on one megawatt?
  46. A standard term in the industry that is used to measure and confirm the amount of power that is generated, delivered, and consumed.
  47. It takes one _____ to push one _____ through one _____.
    • volt
    • amp
    • ohm of resistance
  48. In a DC circuit, the current is _____ proportional to the voltage, and ______ proportional to the resistance.
    • directly
    • inversely
  49. The work performed when voltage and amperage are combined.
    Power, measured in watts
  50. What are the five rules of grounding overhead distribution lines?
    • Identify
    • Isolate
    • Test
    • Clean
    • Ground
  51. When the work is confined to one pole, which grounding method should be utilized?
  52. If a conductor is to be opened up, a ______ must be installed connecting both ends before the conductor is cut.
  53. On multiple pole projects, which grounding method should be used if possible?
  54. It is recommended that the cluster-to-conductor jumper of the personal grounds be attached to the conductor __________.
    being worked on
  55. During stringing operations near energized lines and equipment, employees working near the stringing equipment and conductors should always wear _______.
    rubber gloves
  56. The employee in charge decides the degree of protection provided for a specific stringing project based on?
    • All pertinent OSHA regs
    • Company policies
    • Potential hazards involved
  57. When splicing conductors on the ground, what offers the greatest protection for workers?
    Wearing rubber protective equipment
  58. It is a good practice to jumper out conductors before they are spliced to avoid what?
    The line worker being placed in series with the circuit.
  59. What does OSHA require concerning the grounding of vehicles?
    Necessary precautions are taken when lifts or derricks are being used in the proximity of energized lines.
  60. When grounding a vehicle, why is it a good idea to ground it to the system neutral?
    To ensure the protective equipment operates as fast as possible.
  61. It is always important to understand the possible hazards of ______ and ______ that exists when the derrick or aerial lift is in the proximity of energized lines.
    • step
    • touch potential
  62. What does OSHA require concerning the grounding of capacitor banks?
    You must wait 5 minutes after de-energizing the capacitor bank before short-circuiting and grounding the terminals.
  63. What are the three steps to ground a capacitor bank?
    • Open disconnects
    • Wait 5 minutes
    • Install personal protective grounds
  64. When grounding capacitor banks, what should the grounds be applied to?
    The leads that attach to the disconnects
  65. What are the two main sources for identifying underground cables?
    • Cable tags
    • Feeder maps
  66. With underground systems, why is cable identification critical?
    Cables cannot be physically traced from the clearance points that have been established.
  67. What are the four steps to clear and ground underground cables?
    • Identify
    • Isolate
    • Test
    • Ground
  68. When grounding overhead transmission, there is no system neutral.  What are two convenient grounding sources according to the book? 
    • Steel structures
    • Shield wires
  69. Why is induction a major concern when working on transmission lines?
    Many transmission lines are constructed with 2 circuits to gain the advantage of a single right of way.  It is rare to de-energize both circuits at once.
  70. What are the six steps to grounding overhead transmission lines?
    • Test all phases for the presence of voltage.
    • Clean all conductors with wire brush.
    • Install cluster brackets and connect to ground source.
    • Connect jumpers to cluster brackets first, then to any phase using live line tool.
    • Connect jumpers to grounded phase, then to other phases.
    • Wire brush shield wire and connect from phases to shield wire.
  71. On transmission lines, some utilities have ground switches at the terminals.  What are these switches used for?
    To reduce induction, not to replace personal protective grounds.
  72. What is taken into account when deciding to ground just the transmission phase work is being done on or all three phases? 
    How fast circuit protection will clear a single phase to ground fault as compared to a three phase to ground fault.
  73. On lattice towers, why should a butt ground be used?
    The resistance of the footing and it's integrity  as a reliable ground source is unknown.
  74. Tests have shown that induced voltages can range from ______ to ______ volts with the existing energized line unfaulted.
    • 1,000
    • 15,000
  75. The maximum distance between stringing block grounds should never exceed _____.
    2 miles
  76. It is a good practice to install stringing block grounds on the first structure from the _____ and _____ equipment.
    • payout
    • tensioning