7th Step Written (2016)

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electric
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143356
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7th Step Written (2016)
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2016-08-17 15:03:03
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7th Steps Written (2016)
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  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. Drive
    A Potential-Flux and a Current-Flux, acting on a disk, in a time and space displacement.
  8. Drag
    A permanent magnet calibrated at the factory, with the known voltage and amperage to set the speed of the disk.
  9. Lag
    Potential-Flux must lag Current-Flux by exactly 90 electrical degrees at unity power factor to establish max torque of the disk at any given load power factor.
  10. Record
    A kilowatt-hour register, counting disk revolutions, displaying them in kilowatt-hours, accomplished at reduction at shaft
  11. Form
    Industry standard to describe the meter
  12. Test Amps
    Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1f) (500Rph Poly f)
  13. Class
    Rated amperage a meter can continuously handle per phase, provided the meter housing and wiring are adequate
  14. PKh
    Watt-hour Constant x Transformer Factor
  15. OHM
    (multiple choice)
    The practical unit of electric resistance? That is the resistance, which allows one ampere to flow when the impressed potential is one volt.
  16. Demand Register
    (multiple choice)
    A mechanism for use with an integrating electricity meter that indicates maximum demand and also registers energy.
  17. Power Factor
    (multiple choice)
    The ratio of the active power to the apparent power.
  18. Volt
    (multiple choice)
    The practical unit of electromotive force, or potential difference
  19. Conductance
    (multiple choice)
    The ability of a substance or body to pass an electric current
  20. Capacitance
    (multiple choice)
    The property of an electric circuit which allows storage of energy and exists whenever two conductors are in the close proximity but separated by an insulator or dielectric material
  21. Stator
    (multiple choice)
    The unit which provides the driving torque in a mechanical watthour meter
  22. Cycle
    (multiple choice)
    One complete set of positive and negative values of an alternating current or voltage
  23. Demand
    (multiple choice)
    The average value of power or related quantity over a specified interval of time.
  24. Are Line and Load conductors are allowed in the same raceway or conduit if pre-approved by the electric meter department.
    No
  25. May Ice and snow shields be required on meters/risers on new or rewired services in locations above 6000 feet.
    Yes
  26. List the missing figures in the Blue Book diagram CR-70.
  27. List the missing figures in the Blue Book diagram SC-10
  28. Draw a pictorial and schematic view of a ***4 wire 3 phase 480 Wye and
    ***3 wire network transformer banks and do the following:
    -Connect the conductors from these drawings to the secondary lines.
    -Label the voltages from this system at the secondary lines.
    - Draw and connect all electromechanical SC Abase and Solid State meters
    4 wire 3 phase Wye -FM12 (3phase), 14, 16

    Three Wire network   -FM1,12
  29. Draw  (Socket and A-base) and label the following meters include the current and voltage stabs for the following transformer rated meters.
    FM5, FM6, FM8, FM9
  30. The distribution facilities of the customer beyond the point of delivery shall be connected to the Company's distribution system at one central point through protective devices, approved by the Company, installed and maintained at the expense of the Company.
    True or False
    False
  31. Is all energy to be metered at one location.
    • Yes
    • (Bluebook pg18)
  32. Surge suppression is only allowed between the meter and the socket.
    • No
    • (bluebook pg16)
  33. No electrical equipment shall be installed directly above the gas meter or in an area ______ inches on either side of a gas meter set.
    12"
  34. Can platforms be used to meet meter height requirements if they meet NEC requirements.
    Yes
  35. Is a stamped brass address tag required on any location of meter socket.
    No. It must be on a non-removable portion
  36. How much clearance is required on either side on the center line of the meter socket per NEC in an enclosed space.
    18"
  37. Must residential self contained meter installations be:
    Hot sequence or Cold Sequence
    Hot sequence
  38. Can a meter socket, service mast, or service riser be concealed in any part of a building.
    • In general no, but the mast can pass through the eave.
    • Bluebook pg 27
  39. Will the company permit a temporary unmetered service (closed loop/flat tap/jumpered) on new electrical services.
    No
  40. Shall the company specify the location of the underground service lateral and metering equipment.
    Yes
  41. Calibrating Constant
    • The inverse of the number of current circuits in series under test.
    • (Establishes the Kh of individual elements)
  42. Creep
    With applied voltage only, the meter disk makes 1 full revolution either forward or backwards in 10 minutes or less
  43. COLD SEQUENCE METERING
    -Cordova's definition
    -BB Definition
    The utilization of a fault current limiting disconnect device between the electric meter and the supply source.  

    • 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.
  44. ‘A’ Base Meter
    An A base meter is an electromechanical meter where the line and load side conductors are physically connected to the bottom of the meter.
  45. Draw a Fm 2 and explain customer use vs how the meter measures the load on a FM 2 meter.                 
    - 120/240 service      
    - The customer is using 12 amps on one leg, 10 amps on  the other leg, and 20 amps phase to phase.
    See Participant guide, Single phase SC Meters Pg 121
  46. Draw a Fm 1 and explain customer use vs how the meter measures the load on a FM 1 meter.       
    - The customer is using 20 amps
    See Participant guide, Single phase SC Meters Pg 121
  47. Ohms’s Law
    • E=I x R
    • (solve problems)
  48. Identify and explain the four (4) basic meter functions and how they apply to a solid state meter.
    Sample – Samples current and voltage at the CT’s and meter stabs

    Calculate – Multiplies current and voltage in phase, to calculate watts being used

    Convert – Converts data into a digital signal to be sent to the digital display

    Display – Displays consumption in Kwhrs or KW for billing purposes
  49. ‘S’ Base Meter
    A Socket meter is an electromechanical meter in which the meter is designed to plug into a pre-existing meter socket / housing where all the line and load conductors are wired to the internal socket.
  50. 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.
  51. 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.
  52. 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.

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