ET1 Installation Standards.txt

  1. SOVT section 1
    Introduction and Administration
  2. SOVT section 2
    Inspection and Validation Tests
  3. SOVT section 3
    Cold Checks
  4. SOVT section 4
    Equipment Tests
  5. SOVT section 5
    Intra-System Tests
  6. SOVT section 6
    Inter-System Tests
  7. SOVT section 7
    Operational Tests
  8. SOVT section 8
    At-Sea and Other Special Tests
  9. For most applications, ground rods of +++++ diameter, and length of +++++, are used where bedrock is beyond a depth of ++++++.
    1.90 cm (3/4 inch), 3.0 meters (10 feet), three meters (10 feet).
  10. The metal framework of buildings may exhibit a resistance to earth of less than __ ohms, depending upon the size of the building, the type of footing, and the type of subsoil at a particular location.
  11. Class A bond:
  12. Class B bond
    Bolting or clamping
  13. Class C bond
    Bridging using a metallic strap
  14. DC resistance across bonding and grounding junctions shall not exceed +++ ohms for electrical safety
  15. RF impedance across bonding and grounding junctions shall not exceed ++ ohms at ++ megahertz (MHz)
    25, 30
  16. The earth electrode subsystem rods are interconnected with No. +++ AWG, or larger, bare copper cable
  17. Other structures located greater than ++++ feet, are provided with a separate earth electrode subsystem
    6m (20 feet)
  18. If there is more than one earth electrode subsystem, they are interconnected with two bare No.__ AWG copper cables that use independent routes
  19. Measure the resistance to earth every +++ months after the initial 12-month period of installation using the FALL-OF-POTENTIAL
  20. METHOD
  21. Determine if the resistance of the earth electrode subsystem to ground using the FALL-OF-POTENTIAL METHOD is less than
  22. ++ ohms
  23. Determine if the wideband noise with respect to earth ground measures less than 100 mV p-p, with periodic noise burst not
  24. exceeding+++ V p-p, and occasional bursts up to +++ V p-p or greater
    0.5, 1.0
  25. Measure the resistance to earth of all equipment, structures, fences and gates that are required to be bonded to ground and meets requirements of being less than +++ ohms
  26. MIL-STD-188-124B recommends that ++++ be installed on 120-volt, single-phase, 15- and 20-ampere receptacles of C-E facilities.
  27. Generally, less than ___ A is acceptable within a facility fault protection subsystem.
  28. An average lightning strike consists of about three strikes, with the first strike discharging an average of +++
    18 kA
  29. Subsequent lightning strikes will discharge about ____ the current of each preceding lightning strike.
  30. Five effects of lightning
  31. Mechanical
  32. Electrical
  33. Conductor Impedance
  34. Induced Voltage
  35. For this reason, metal objects within +++ feet of lightning down conductors should be electrically bonded to the down
  36. conductors.
  37. The high voltage of a lightning strike may be high enough to cause a flashover to conducting objects located as
  38. close as +++ inches away.
  39. Roof and down conductors must be a separate ++++ AWG cable, continuous, un-spliced and installed in as straight a line as possible in order to provide a low-impedance path from the highest conductive surface (air terminal) to the main ground connection point
  40. The tip of the air terminal should be at least +++ inches above the structure you are protecting.
  41. If a building has a sloping roof then air terminal placement should be on the corners and edges where terminals that are:
    Less than 24 inches in height are spaced a maximum of 20 ft apart
  42. Equal to or greater than 24 inches in height are spaced a maximum of 25 ft. apart
  43. If a building has a pitched roof then air terminal placement should be within +++ feet of ridged ends
  44. If a building has a flat roof then air terminal placement should be +++++++++++
    on the corners or edges
  45. Any critical stuctures within a ++:++ cone of protection do not require lightning protection.
  46. Any non-critical structures within a ++:++ cone of protection do not require protection
  47. The maximum DC resistance of a 75-foot or less copper-clad steel down conductor shall not be greater than +++++ ohms per 1000 ft.
  48. The maximum DC resistance for a 75 foot or more, copper-clad steel down conductor shall not be greater than ++++ ohms per 1000 ft.
  49. The conductivity of copper-clad steel shall not be less than ___ of a solid copper conductor with an equivalent cross-sectional area.
  50. The bend radius of a down conductor should not be less than ++++ inches.
  51. The angle of any down conductor bend shall not be less than ++++ degrees
  52. An air terminal must have at least ++++ paths for discharging the lightning to ground
  53. At least +++ down conductors shall be placed on any structure
  54. On structures exceeding 250 ft. in perimeter, an additional down conductor is required for each additional +++ ft. of perimeter.
  55. The ground rod shall be at least +++ feet long and +++ inch in diamete
    8, 1/2
  56. Ground rods are constructed of:
    copper-clad steel, solid copper, hot-dipped galvanized steel, or stainless steel
  57. The lightning protection subsystem should be inspected visually every +++ months and mechanically every +++ months per NETA guidelines.
    two, 12
  58. The +++++++ ground configuration is preferred for Communications Electronics (C-E) facilities
    multi-point(or equipotential)
  59. Signal reference subsystem grounding configurations for all of the equipment in a facility falls into one of three grounding configurations:
    Floating ground configuration
  60. Single-point ground configuration
  61. Multi-point (or equipotential) ground configuration
  62. The single point ground configuration is recommended for use in low frequency electronic systems up to approximately ++++kHz
  63. ++++++ ground configurations are extremely poor grounds at RF frequencies because the ground impedance varies with frequency
  64. ++++++++ ground configurations are not recommended for use in C-E facilities
  65. The multi-point ground type of configuration is recommended for higher frequencies—+++ kHz and above
  66. A typical equipotential ground plane installation will consist of +++ inch square metal pads located throughout the building, flush with the surface of the concrete floor.
  67. If using insulated wires for a ground terminal connection, they must be at least +++ AWG. If +++ AWG is used, it must be less than +++ feet in length.
    16, 16, 5
  68. Which of the following materials should be NOT when grounding an electrode?
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ET1 Installation Standards.txt