6th Step Written (2016)

The flashcards below were created by user electric on FreezingBlue Flashcards.

  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. Stator
    The unit that provides the driving torque in a watthour meter that contains a potential coil, current coil and the necessary steel to provide a magnetic path/flux.
  9. Demand
    The average rate of consumption over a specific period of time
  10. Calibrating Constant
    The reciprocal, or inverse, of the number of current circuits in series, under test.
  11. Power
    • An electrical load expressed in watts or kilowatts without a relationship to time.
    • E x I=Watts
  12. Energy
    An electrical load expressed in watts or kilowatts times the number of hours it’s used.

    E x I x time factor = Kwhr
  13. 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.
  14. 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 th 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.  
  15. 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.
  16. 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.
  17. 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.
  18. When are class 2 rubber gloves required?
    For cutting service drops during fire.
  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
    That 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. Register Ratio Formula
    • 10,000 x Kr
    • TFxKhxRs
  35. Watts Formula
    • Kh x 3600 x revs
    • Time in seconds
  36. Demand Formula
    • E x I x CC x TF
    • 1,000

    (I = applied amps)
  37. What is the minimum depth of UG service laterals?
    24 inches
  38. What is the maximum allowable number of risers on a building?
    6 with only one set of conductors in each
  39. What is an Ohm?
    The practical unit of electric resistance.
  40. What is a demand register?
    A mechanism that indicates maximum demand and also registers energy used
  41. What is a cycle?
    One complete set of positive and negative values of an alternating current or voltage
  42. Define Demand
    The average value of power or related quantity over a specified interval of time.
  43. What is the min/max height for multiple indoor meter installations. (final grade to meter center)
    2' min/6.5' max
  44. Define Volt
    The practical unit of electromotive force or potential difference.
  45. What is the min/max height for multiple outdoor meter installations. (final grade to meter center
    3' min / 6.5' max
  46. 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.
  47. Do all meters need to be installed outdoors unless approved by the meter department?
    Yes
  48. Rs Formula
    • 10,000 x Kr
    •  TFxKhxRr

    • or Rg
    •     Rr
  49. Kh formula
    • 10,000 x Kr
    •  TFxRrxRs
  50. Rg formula
    Rr x Rs
  51. Transformer Factor formula
    TF= CTR x PTR
  52. VOLTAGE UNBALANCE
    Maximum voltage deviation from average voltage.
  53. AMR
    Automated Meter ReadingAn automated method of reading electric registers (indexes)
  54. CLASSIFICATION OF METERING
    Commercial, Industrial and Residential
  55. COMPANY
    The operating Companies of Xcel Energy
  56. CONDUIT or DUCT
    Standard tubular material used for mechanical protection of electrical systems which may be exposed, buried beneath the surface of the ground, or encased in a building structure as required.
  57. INSPECTOR
    The electrical inspector of the Public Authority.
  58. METER/METERING EQUIPMENT
    The equipment necessary to measure the customer’s electric energy use and demand including meter socket, instrument transformers, protective device and meter.
  59. MULTIPLE METER CENTER
    A pre-assembled multiple metering unit or fabricated meter center using meter sockets where two or more customers are metered at a common location.
  60. MEANS OF ATTACHMENT
    Fittings used to attach service-drop conductors.(Screw knob, clevice, etc)
  61. Point of Delivery
    Point where the Company’s electric facilities are first connected to the electric facilities of the customer.
  62. Service
    The furnishing of electric energy for the exclusive use of the individual customer.
  63. Service Drop
    The overhead service conductors from the last distribution pole or other aerial distribution support to and including the splices connecting to the service-entrance conductors at the building or other structure.
  64. SERVICE LATERAL
    The underground service conductors between the Company secondary distribution system and/or transformer terminals and the connection to the service-entrance conductors in a terminal box or meter socket located outside the building wall. Where the meter is located in the building and no terminal box exists outside the building, the point of connection shall be considered the point of entrance of the service conductors into the building.
  65. Voltage Transformer
    An instrument transformer intended for use in the measurement or control of a circuit and designed to have its primary winding connected in parallel with the circuit.
  66. Closed Loop
    Temporary unmetered electric service.
  67. Primary Metering
    Metering of service voltages above 480V nominal
  68. Jumpered
    Temporary unmetered electric service.
  69. Stator
    The unit that provides the driving torque in a watt-hour meter. It includes the Potential-Coil, the Current-Coil and the related framework to provide a magnetic flux or path
  70. Capacitance
    The property of an electric circuit which allows storage of energy and exists whenever 2 conductors are close in proximity, but separated by an insulator or dielectric material. (multiple choice on test)
  71. Conductance
    The ability of a substance to pass an electric current.
  72. Is a cold sequence disconnect required on all new, rewired, or altered self-contained meter installations?
    No. Only commercial and there are exceptions.
  73. How far from the meter must a cold sequence disconnect be located?
    Within 24 inches, on the same wall as the meter.
  74. A cold sequence disconnect must limit fault current at the meter to how many amps?
    10,000 amps
  75. With written approval from Xcel, what other device can be used in lieu of a "fused" cold sequence disconnect?
    A fault-current limiting circuit breaker.
  76. Be able to solve problems using specific values using the following formulas:
    • Kh
    • RR
    • TF
    • Rs
    • Pulses from demand
    • Demand from pulses
  77. Draw the following meters Socket & Abase:
    Fm 5,6,8,9
  78. Draw the following meter banks and connect the applicable meters:
    • 3W3phase Open Delta
    • 4W3phase Closed Delta
    • 4W3phase Wye
  79. Be able to fill in missing values from the following Blue Book drawings:
    • CR-70
    • CR-70A
    • CR-130
Author:
electric
ID:
316451
Card Set:
6th Step Written (2016)
Updated:
2016-08-17 19:04:12
Tags:
electric meter
Folders:

Description:
6th Step Written (2016)
Show Answers: