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5th Step written (2016)

  1. Kh
    • Watt hour constant
    • The value of 1 revolution of the meter disk, Expressed in watt hours.
  2. Rr
    • Register Ratio
    • The number of turns of the 1st gear of the register to cause the 1st (or right hand) dial pointer to complete 1 full revolution which = 10,000 watt hours or 10kwhrs.
  3. Rg
    • Gear Ratio
    • The number of turns of the meter disk to cause the 1st (or right hand) dial pointer to complete 1 full revolution = 10,000 watt hrs or 10kwhrs."
  4. Rs
    • Reduction at Shaft
    • The ratio between the number of teeth on the 1st gear of the register to the number of entries on the disk shaft.
  5. Kr
    • Register Constant or Multiplier
    • Multiplier of the register, due to gearing.
  6. TF
    • Transformer Factor
    • Multiplier of the register, due to CT’s and/or CT X PT ratios.
  7. PKh
    Watt-hour Constant x Transformer Factor
  8. Demand
    The average rate of consumption over a specific period of time
  9. Power
    • An electrical load expressed in watts or kilowatts without a relationship to time.
    • E x I=Watts
  10. Energy
    An electrical load expressed in watts or kilowatts times the number of hours it’s used.

    E x I x time factor = Kwhr
  11. Blondel's Theorum
    In a system of N-conductors, N-1 metering elements properly connected, will measure power and/or energy consumed, provided that all potential coil(s) have a common connection in which no current circuit(s) are connected.
  12. List 3 rules of a right triangle
    • -Must contain a 90 degree angle
    • -All 3 angles must = 180 degrees
    • -Hypotenuse is always the longest side, always C
    • -Reference angle establishes the adjacent
  13. COLD SEQUENCE METERING
    -Cordova's definition
    -BB Definition
    • A 10,000 amp current limiting fuse disconnect ahead of the meter, located on the same wall as the meter within 2 feet of the meter.
    • (Cordova's definition)
    • The utilization of a fault current limiting disconnect device between the electric meter and the supply source.  
  14. HOT SEQUENCE METERING
    The electric meter is connected directly to the service conductors without the use of a fault-current limiting disconnect or meter safety-switch device between the electric meter and the supply source.
  15. HIGH-LEG
    (Wild or Power leg)
    • The phase having the higher phase voltage to ground on a 4-wire delta-connected service, where the midpoint of one phase winding is grounded.
  16. SERVICE MAST
    The service mast is the conduit containing the service-entrance conductors where the point of attachment and the connection between the service drop and the service-entrance conductors is located above the roofline. The conduit extends to a point, and the weather head is located, above the roof eave. The conduit passes through the eave of the building or extends past the roofline without passing through the eave. The means of attachment is attached to the service mast.
  17. When are class 2 rubber gloves required?
    For cutting service drops during fire.
  18. Are hard hats required every time you're outside of your truck?
    no
  19. DATA PULSES
    Output pulses (KYZ) generated by the electric meter for use by the Customer.
  20. SERVICE RISER
    The service riser is the conduit containing the service-entrance conductors where the point of attachment and the connection between the service drop and the service-entrance conductors is located on a pole or below the roofline of the building being served. The conduit extends to a point, and the weather head is located, below the roof eave. The means of attachment is secured to the pole or building and is not attached to the service riser.
  21. POINT OF ATTACHMENT
    The point at which the service-drop conductors are attached to a building or other structure.
  22. CURRENT TRANSFORMER (CT)
    An instrument transformer designed for the measurement or control of current.
  23. EMT
    Electric Metallic Tubing
  24. GRC
    Galvanized Rigid Conduit
  25. IMC
    Intermediate Metallic Conduit
  26. ISOLATED TRANSFORMER BANK
    A transformer bank which provides electrical service to a single customer.
  27. NEC®
    NATIONAL ELECTRICAL CODE

    A publication of the National Fire Protection Association, Inc.
  28. NESC®
    NATIONAL ELECTRICAL SAFETY CODE

    A publication of the Institute of Electrical and Electronic Engineers, Inc. as adopted by ANSI.
  29. PVC
    Polyvinyl Chloride
  30. RACEWAY (gutter)
    Any channel for holding bus bars, cables, or wires, which is designed for this purpose.
  31. RESIDENTIAL METERING
    Metering of services used for the exclusive use of the individual customer for domestic purposes.
  32. SECONDARY CONDUCTORS
    The part of the Company's distribution system, which connects the secondaries of the Company’s distribution transformers to the service drop or service lateral.
  33. AUTHORIZED CLOSED LOOP
    Authorized use of electric service that is temporarily not being metered.
  34. When electric meter employees are working on Company premises other than electric meter shops, they shall conform to the safety rules of other departments?
    True or False
    • True
    • Section 330.08 of safety manual
  35. Register Ratio Formula
    • 10,000 x Kr
    • TFxKhxRs
  36. Watts Formula
    • Kh x 3600 x revs
    • Time in seconds
  37. Demand Formula
    • E x I x CC x TF
    • 1,000

    (I = applied amps)
  38. What is the vertical clearance from ground for service-drops over other land traversed by vehicles?
    16 feet
  39. What is the max height of the point of attachment from final grade?
    24 feet
  40. How many days max can the company grant permission to close a loop
    7 Calendar days
  41. What size and material is required for service masts?
    2” minimum GRC
  42. Can conduit couplings be installed above the roofline
    No
  43. Can phone loops, cable TV conductors, grounding clamps, etc. be attached to the service mast.
    No, only the Company’s power service-drop conductors shall be attached to a service mast.
  44. Are line and load conductors permitted in the same raceway or conduit.
    No
  45. When are junction boxes, conduit fittings (e.g. LB’s), or other devices allowed?
    Only with specific written approval from the Company’s local Electric Meter Department.
  46. When can the Company authorize a closed loop on new electrical services.
    Never on NEW services
  47. What is the maximum length of #2 triplex service drop conductor to residential and commercial installations?
    90 feet
  48. What is Pythagorean's Theorem 
    (use to solve problem)
    c2 = a2 + b2
  49. Using the basic laws of Trigonometry solve/prove that the wild (high) leg is 208 volts from center tap neutral on a 120v/240v delta system.
  50. Using the basic laws of Trigonometry solve/prove that the phase-to-phase wye voltage is 208 volts.
  51. What is the maximum service span for a 1/O service?
    80 feet
  52. What is the maximum service voltage that can be attached directly to a building (except substations or transformer rooms)
    2400 volts
  53. How many feet must conduit extend beyond hardscape edge when service conductors are under hardscape?
    2 feet
  54. What is the minimum depth of UG service laterals?
    24 inches
  55. What are the length, diameter and material type of slip sleeves?
    • 18" long, Schedule 40PVC for 2 1/2" diameter
    • 18" long, Schedule 80PVC for 3" diameter
  56. Can the bottom center knockout of a meter housing be used for line side UG conductors entering the housing?
    No
  57. What is the maximum length for an OH temp service drop?
    70 feet
  58. What is the maximum allowable number of risers on a building?
    6 with only one set of conductors in each
  59. What is the maximum number of cables in a standard single-phase pedestal with a 6-position URD mole?
    15
  60. Should all electrical equipment be considered energized?
    Yes, per safety manual.
  61. Which safety rules apply when EM employees are working on company premises other than EM shops?
    The Safety rules of other departments
  62. When are Lineman's class 2 or higher rubber gloves required to be worn?
    When cutting service drops at a fire or similar emergency.
  63. When can 2 employees work off a single ladder?
    Never!
  64. What is the maximum allowable metered load?
    4,000 amps
  65. Mast supports are required if the service attachment point exceeds what height?
    48"
  66. What is the maximum service span for a 4/O service drop?
    70 feet
  67. Service conductors must be in conduit when under hardscape. How many inches must conduit extend past the hardscape edge.
    24
  68. U-guard risers shall be grouped together and shall not occupy more than what percent of the pole?
    40%
  69. What are the minimum dimensions of a 200amp meter housing?
    19" tall by 13" wide
  70. Where and how must apartment numbers be marked?
    By permanent durable means at the meter socket, corresponding breaker, tenant entrance.
  71. What is the max distance the point of attachment shall be located from the weatherhead?
    24"
  72. Can a stamped brass address tag be on any location of the meter housing?
    • No.
    •  Must be on a non-removable portion.
  73. What is the minimum length for a residential service entrance conductor?
    24"
  74. What is the minimum length for a commercial service entrance conductor?
    36"
  75. What is the vertical clearance from ground for service-drops over spaces and ways to subject to pedestrians?
    12 feet
  76. What is the vertical clearance from ground for service-drops over driveways, parking lots, and alleys?
    16 feet
  77. What is the vertical clearance from ground for service-drops over other land traversed by vehicles?
    • 16 feet for triplex, quadraplex, etc
    • 16.5 feet for open wire
  78. What is an Ohm?
    The practical unit of electric resistance.
  79. What is a demand register?
    A mechanism that indicates maximum demand and also registers energy used
  80. What is a cycle?
    One complete set of positive and negative values of an alternating current or voltage
  81. What is the min/max height for single meter installations. (final grade to meter center)
    4' min, 6' max
  82. What is the min/max height for multiple indoor meter installations. (final grade to meter center)
    2' min/6.5' max
  83. Define Volt
    The practical unit of electromotive force or potential difference.
  84. How many services (delivery points) per building?
    • Only 1 except for
    • - emergency lighting
    • - optional standby systems
    • - parallel power production systems
    • - capacity requirements
  85. Who installs and maintains the point of attachment?
    The customer
  86. What is the min/max height for multiple outdoor meter installations. (final grade to meter center
    3' min / 6.5' max
  87. What are the minimum depths of working space in front of metering equipment?
    • 3'
    • 3' 6"
    • 4'
    • Depending on material (how fire proof) NEC mandates.
  88. Do all meters need to be installed outdoors unless approved by the meter department?
    Yes
  89. Underground temporary service ground rods will be installed by the customer within all utility easements. T or F
    • False.
    • Must be outside utility easements (pg 43)
  90. What are the 3 sides of a right triangle?
    Hypotenuse, Adjacent, Opposite.
  91. Using Trig functions, prove phase to phase voltage on a Wye system.
  92. Using Pythagorean Theorem, prove wildleg voltage on a Delta system.
  93. What is the formula to determine "True Power"?  (solve problem)
    E x I x Cosine theta = Watts
  94. What is the formula to determine "Apparent Power"?  (solve problem)
    VA(volt amps)=E x I
  95. Solve 4 problems using trig functions.
  96. Draw A-base and Socket
    FM1, FM2, FM12, FM14, FM15, FM16
  97. Draw and connect applicable A-base and Socket meters for:
    Single phase delta bank
    4W3phase Delta bank
    4W3phase Wye bank
  98. Rs Formula
    • 10,000 x Kr
    •  TFxKhxRr

    • or Rg
    •     Rr
  99. Kh formula
    • 10,000 x Kr
    •  TFxRrxRs
  100. Rg formula
    Rr x Rs
  101. Transformer Factor formula
    TF= CTR x PTR
  102. Know missing values for:
    CR10
    TM10, TM20, TM30
    SC40, SC60
Author
electric
ID
127630
Card Set
5th Step written (2016)
Description
5th Step
Updated

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