# 3rd Step 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. Test Amps
Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1phase) (500Rph Poly phase)
8. PKh
Watt-hour Constant x Transformer Factor
9. Demand
The average rate of consumption over a specific period of time
10. Calibrating Constant
The inverse of the number of current circuits in series under test.

(Establishes the Kh of individual elements)
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. Define Cold Sequence Metering
The utilization of a fault current limiting disconnect device between the electric meter and the supply source, adequate to protect meters from excessive fault currents.
14. Detent
A mechanical or solid state device to prevent reverse disk rotation.
15. Network
2 hots and a neutral on a wye bank
16. Creep
With applied voltage only, the meter disk completes one full rotation either forward or backwards in 10 minutes or less.
17. 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.
18. What does “AMR” stand for?
What does it mean?
• A method of reading electric registers.
19. Register Ratio Formula
• 10,000 x Kr
• TFxKhxRs
20. Watts Formula
• Kh x 3600 x revs
• Time in seconds
21. Kh Formula
• 10,000 x Kr
• TF X Rr x Rs
22. Rs Formula
• 10,000 x Kr
• TF x Kh x Rr
23. Rg Formula
Rr x Rs
24. Kr Formula
• Kh x Rr x Rs x TF
•        10,000
25. Define Hot Sequence Metering
The electric meter is connected directly to the service conductors without the use of a fault-current limiting disconnect device between the electric meter and the supply source.
26. Define Data Pulses
Output pulses (KYZ) generated by the electric meter for use by the customer.
27. Define High (Wild) 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.
28. Draw and label FM1,2,12,14,15,16,5,6,8,9 socket and A-base meters
29. Define 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
30. Define Voltage Unbalance
Maximum voltage deviation from average voltage.
31. Define 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 weatherhead is located, above the roof eave. The means of attachment is attached to the service mast.
32. Define 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 weatherhead 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.
33. Define Point of Attachment
The point at which the service-drop conductors are attached to a building or other structure.
34. Define Closed Loop
A temporary unmetered electric service.
35. What is the max distance the point of attachment shall be located from the weatherhead?
24"
36. What is the minimum length for a residential service entrance conductor?
24"
37. What is the minimum length for a commercial service entrance conductor?
36"
38. What is the vertical clearance from ground for service-drops over spaces and ways to subject to pedestrians?
12 feet
39. What is the vertical clearance from ground for service-drops over driveways, parking lots, and alleys?
16 feet
40. What is the vertical clearance from ground for service-drops over other land traversed by vehicles?
16 feet
41. What is the max height of the point of attachment from final grade?
24 feet
42. How many days max can the company grant permission to close a loop
7 Calendar days
43. What size and material is required for service masts?
2” minimum GRC
44. Can conduit couplings be installed above the roofline
No
45. What is the max total amps rating of the main disconnect for a 200 amp continuous duty rated meter socket.
• 250 amps
• (400 amps max for a CL320 rated housing)
46. 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.
47. Can line and load conductors are permitted in the same raceway or conduit.
No
48. 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.
49. When can the Company authorize a closed loop on new electrical services.
Never on NEW services
50. What is the maximum length of #2 triplex service drop conductor to residential and commercial installations?
90 feet
51. List 3 of the 5 rules for solving a right triangle
• -Sum of the three angles in a triangle is always 180o
• -The right angle is 90o by definition
• -The hypotenuse is always the side opposite of the 90o angle
• -The opposite side is the side across from the angle given
• -The adjacent side is the side that makes up the given angle in combination with the hypotenuse
52. Identify or name all three sides of a right triangle.
53. What is Pythagorean's Theorem
(use to solve problem)
c2 = a2 + b2
54. 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.
55. Using the basic laws of Trigonometry solve/prove that the phase-to-phase wye voltage is 208 volts.
56. Draw and label the following banks both pictoral and vector drawings:
• - Open Delta 3W3phase
• - 3W3phase closed Delta
• - 4W3phase Wye
• - 4W3phase Delta

## Card Set Information

 Author: electric ID: 313594 Filename: 3rd Step Written (2016) Updated: 2017-11-13 16:08:50 Tags: 3rd month Written 2016 Folders: 3rd 6 month Written (2016) Description: 3rd Step Written (2016) Show Answers:

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