1. License Examination Practice Drill 2017-6
Ted “Smitty” Smith

2. Given: A delta-wye, three transformer has a secondary line current of amperes at 208V, what is the primary line current at 480V?
135.3 amperes
312.5 amperes
amperes
416 amperes

3. 1. A
135.3 A

4. Where a conductor is marked RHW-2 on the insulation what does the -2 represent?
The cable has 2 conductors
The conductor is double insulated
The conductor has a nylon outer jacket
The conductor has a maximum operating temperature of 90°C.

5. 2. D Table (A)

6. For a grounded electrical system, the equipment grounding conductor shall be sized in accordance with ___________?
The undergrounded circuit conductors
The overcurrent protective device
The service entrance conductors
The grounding electrode

7. 3. B
250.32(B)(1)
Table

8. Determine the allowable ampacity of a size 300 kcmil, THW aluminum conductor installed in a raceway with four (4) other current-carrying conductors when the expected ambient temperature is 44 deg. C.
151 amperes
164 amperes
210 amperes
146 amperes

9. 4. A
Tbl (B)(16)
Tbl (B)(2)(a)
Tbl (B)(3)(a)

10. Determine the MAXIMUM number of 120-volt, general-purpose duplex receptacles the NEC® permits to be protected by a 20-ampere, 120-volt single-pole circuit breaker in a commercial building. 18 15 13 10

11. 5. C
120 volts x 20 amperes= 2400 VA
2400 VA / 180 VA= 13 receptacles

12. For lighting systems operating at 30 volts AC or less, the output circuits of the power supply are to be rated for NOT more than ___________?
15 amperes
20 amperes
25 amperes
30 amperes

13. 6. C
411.3

14. Where there are tenant spaces in a retail shopping mall, each occupant shall have access to the main disconnecting means, EXCEPT:
Where the service and maintenance are provided by the building management.
Where there are more than six disconnecting means provided.
Where the primary feeder transformer does not exceed 600 volts.
Where the secondary of the service transformer does not exceed 240 volts to ground.

15. 7. A
240.24(B)(1)(1)

16. What is the minimum sized bond jumper that can be used to bond the metal fittings of a hydromassage bathtub to the electrical equipment that is not part of the hydromassge bathtub that are located within five feet of the tub?
4 AWG
6 AWG
8 AWG
10 AWG

17. 8. C
A and B

18. In general, the grounded conductor and the equipment grounding conductor must be bonded together in _____________?
I. Panelboards used as service equipment
All sub-panels
I only
II only
Both I and II
Neither I not II

19. 9. A
250.24(A)
250.24(A)(5)
408.3(C)

20. Using the standard method of calculation, what is the demand, in kW, on the undergrounded service-entrance conductors of an apartment complex that has thirty-five (35) electric ranges rated at 11.5 kW each?
403 kW
15 kW
280 kW
50 kW

21. 10. D
Tbl , Col. C

22. A grounding ring consisting of a size 2 AWG bare copper wire encircling a building, buried 36 in. deep, in direct contact with the earth, is required to have a MINIMUM length of ____________ if it is to be used at a grounding electrode?
15 feet
20 feet
25 feet
50 feet

23. 11. B
250.52(A)(4)

24. Where applying the optional method of calculation for one-family dwelling, what is the demand load for the heating and cooling, in kW, on the ungrounded service-entrance conductors for a residence that has the following?
Three, separately controlled base board heaters rated at 2.8 kW each.
One electric thermal storage hearing unit at 22 kW.
One air-conditioning unit rated 6.5 kW
32.75 kW
22.00 kW
17.03 kW
26.20 kW

25. 12. B
220.82(C) and (C)(6)
Note: Use the larger of the A/C or heating load

26. Apply the general method of calculation for dwelling units and determine the Minimum demand load, in VA, where a one-family residence has the following fastened in place appliances.
Microwave oven – 1,250 VA
Trash compacter – 960VA
Dishwasher – 1,400 VA
Garage door opener – 960 VA
3,428 VA
3,656 VA
C. 4,570
4,883 VA

27. 13. A
Microwave Oven: 1250 VA
Trash Compactor: 960 VA
Dish Washer: 1400 VA
Garage Door Opener: 900 Va
Total: 4570 VA x .75= 3428 VA

28. Where a service riser is installed in a wet location and contains THWN insulated conductors, the wiring method used ________________.
Is permitted to be Type AC cable
Shall be rigid metal conduit (RMC)
Is permitted to be electrical metallic tubing (EMT)
Shall be liquidtight flexible metal conduit (LFMC)

29. 14. C (5)

30. What is the MAXIMUM distance between supports for straight horizontal runs of trade size 1 ½ in. threaded rigid metal conduit (RMC)?
10 feet
12 feet
14 feet
16 feet

31. 15. C
Tbl (B)(2)

32. If a 2”, Schedule 80 PVC ,is installed outdoors for a length of 50 feet and the expected temperature range change in the area will be 50 degrees F, then an expansion joint will need be installed in the installation. True or False
True
False

33. 16. A
Table and Article

34. A thermal barrier shall be required if the space between the resistors and reactors, of 600 volts or less, and combustible material is Less than __________________?
12 inches
18 inches
10 inches
6 inches

35. 17. A
470.3

36. In theaters, all switches for controlling the emergency lighting systems shall be located __________.
On the stage
In the lobby
In the manger’s office
In the project booth

37. 18. B
700.21

38. Where a 90 ampere, 1000-volt DC load is located 225 feet from the source and is supplied with size 3 AWG copper conductors, determine the approximate voltage drop on the conductors. (K=12.9)
6 volts
4 volts
8 volts
10 volts

39. 19. D
VD= 2KDI/CM
2x12.9x225x90/52620= 9.92

40. A one-family residence is served with insulated 120/240 volt service-drop, supported with a grounded messenger wire from the utility company. This service-drop crosses the swimming pool; the pool has a diving board that is 9 feet above the water level. The NEC® requires the conductors to be a Minimum height of ______ above the pool water level.
25 feet
14 ¼ feet
22 ½ feet
23 ½ feet

41. 20. D
Fig
Tbl
The diving board is 9 feet above the water level. You need 22.5 min. from the water. But that would only make it 13.5 feet above the diving board and you need 14.5 from the diving board. So you will need to be 23.5 feet min, from the water level.

42. Click Here to Proceed without the timer

43. Given: A delta-wye, three transformer has a secondary line current of amperes at 208V, what is the primary line current at 480V?
135.3 amperes
312.5 amperes
amperes
416 amperes

44. 1. A
135.3 A

45. Where a conductor is marked RHW-2 on the insulation what does the -2 represent?
The cable has 2 conductors
The conductor is double insulated
The conductor has a nylon outer jacket
The conductor has a maximum operating temperature of 90°C.

46. 2. D Table (A)

47. For a grounded electrical system, the equipment grounding conductor shall be sized in accordance with ___________?
The undergrounded circuit conductors
The overcurrent protective device
The service entrance conductors
The grounding electrode

48. 3. B
250.32(B)(1)
Table

49. Determine the allowable ampacity of a size 300 kcmil, THW aluminum conductor installed in a raceway with four (4) other current-carrying conductors when the expected ambient temperature is 44 deg. C.
151 amperes
164 amperes
210 amperes
146 amperes

50. 4. A
Tbl (B)(16)
Tbl (B)(2)(a)
Tbl (B)(3)(a)

51. Determine the MAXIMUM number of 120-volt, general-purpose duplex receptacles the NEC® permits to be protected by a 20-ampere, 120-volt single-pole circuit breaker in a commercial building. 18 15 13 10

52. 5. C
120 volts x 20 amperes= 2400 VA
2400 VA / 180 VA= 13 receptacles

53. For lighting systems operating at 30 volts AC or less, the output circuits of the power supply are to be rated for NOT more than ___________?
15 amperes
20 amperes
25 amperes
30 amperes

54. 6. C
411.3

55. Where there are tenant spaces in a retail shopping mall, each occupant shall have access to the main disconnecting means, EXCEPT:
Where the service and maintenance are provided by the building management.
Where there are more than six disconnecting means provided.
Where the primary feeder transformer does not exceed 600 volts.
Where the secondary of the service transformer does not exceed 240 volts to ground.

56. 7. A
240.24(B)(1)(1)

57. What is the minimum sized bond jumper that can be used to bond the metal fittings of a hydromassage bathtub to the electrical equipment that is not part of the hydromassge bathtub that are located within five feet of the tub?
4 AWG
6 AWG
8 AWG
10 AWG

58. 8. C
A and B

59. In general, the grounded conductor and the equipment grounding conductor must be bonded together in _____________?
I. Panelboards used as service equipment
All sub-panels
I only
II only
Both I and II
Neither I not II

60. 9. A
250.24(A)
250.24(A)(5)
408.3(C)

61. Using the standard method of calculation, what is the demand, in kW, on the undergrounded service-entrance conductors of an apartment complex that has thirty-five (35) electric ranges rated at 11.5 kW each?
403 kW
15 kW
280 kW
50 kW

62. 10. D
Tbl , Col. C

63. A grounding ring consisting of a size 2 AWG bare copper wire encircling a building, buried 36 in. deep, in direct contact with the earth, is required to have a MINIMUM length of ____________ if it is to be used at a grounding electrode?
15 feet
20 feet
25 feet
50 feet

64. 11. B
250.52(A)(4)

65. Where applying the optional method of calculation for one-family dwelling, what is the demand load for the heating and cooling, in kW, on the ungrounded service-entrance conductors for a residence that has the following?
Three, separately controlled base board heaters rated at 2.8 kW each.
One electric thermal storage hearing unit at 22 kW.
One air-conditioning unit rated 6.5 kW
32.75 kW
22.00 kW
17.03 kW
26.20 kW

66. 12. B
220.82(C) and (C)(6)
Note: Use the larger of the A/C or heating load

67. Apply the general method of calculation for dwelling units and determine the Minimum demand load, in VA, where a one-family residence has the following fastened in place appliances.
Microwave oven – 1,250 VA
Trash compacter – 960VA
Dishwasher – 1,400 VA
Garage door opener – 960 VA
3,428 VA
3,656 VA
C. 4,570
4,883 VA

68. 13. A
Microwave Oven: 1250 VA
Trash Compactor: 960 VA
Dish Washer: 1400 VA
Garage Door Opener: 900 Va
Total: 4570 VA x .75= 3428 VA

69. Where a service riser is installed in a wet location and contains THWN insulated conductors, the wiring method used ________________.
Is permitted to be Type AC cable
Shall be rigid metal conduit (RMC)
Is permitted to be electrical metallic tubing (EMT)
Shall be liquidtight flexible metal conduit (LFMC)

70. 14. C (5)

71. What is the MAXIMUM distance between supports for straight horizontal runs of trade size 1 ½ in. threaded rigid metal conduit (RMC)?
10 feet
12 feet
14 feet
16 feet

72. 15. C
Tbl (B)(2)

73. If a 2”, Schedule 80 PVC ,is installed outdoors for a length of 50 feet and the expected temperature range change in the area will be 50 degrees F, then an expansion joint will need be installed in the installation. True or False
True
False

74. 16. A
Table and Article

75. A thermal barrier shall be required if the space between the resistors and reactors, of 600 volts or less, and combustible material is Less than __________________?
12 inches
18 inches
10 inches
6 inches

76. 17. A
470.3

77. In theaters, all switches for controlling the emergency lighting systems shall be located __________.
On the stage
In the lobby
In the manger’s office
In the project booth

78. 18. B
700.21

79. Where a 90 ampere, 1000-volt DC load is located 225 feet from the source and is supplied with size 3 AWG copper conductors, determine the approximate voltage drop on the conductors. (K=12.9)
6 volts
4 volts
8 volts
10 volts

80. 19. D
VD= 2KDI/CM
2x12.9x225x90/52620= 9.92

81. A one-family residence is served with insulated 120/240 volt service-drop, supported with a grounded messenger wire from the utility company. This service-drop crosses the swimming pool; the pool has a diving board that is 9 feet above the water level. The NEC® requires the conductors to be a Minimum height of ______ above the pool water level.
25 feet
14 ¼ feet
22 ½ feet
23 ½ feet

82. 20. D
Fig
Tbl
The diving board is 9 feet above the water level. You need 22.5 min. from the water. But that would only make it 13.5 feet above the diving board and you need 14.5 from the diving board. So you will need to be 23.5 feet min, from the water level.