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1.

Refer to the figure above. Calculate the minimum ampacity for a feeder serving the following 460V motors: 10hp, 20hp, and 30hp.

75A

115.25A

91A

101.25A

Question 1 of 30

2. When calculating the service requirement for a particular building, the first step is to ________.

apply any demand factors

determine all continuous loads

determine the floor area of the building

calculate the total motor load

Question 2 of 30

3. Using the VA/linear foot method, the total VA that must be used in a service calculation for a 50' show window is ________.

17,750VA

10,750VA

12,500VA

14,500VA

Question 3 of 30

4. What is the adjusted ampacity for each of six No. 4/0 THHN copper current-carrying conductors in a single conduit (given: the ampacity of 4/0 THHN is 260A)?

260A

208A

120A

42A

Question 4 of 30

5. A farm has three buildings with loads of 82A, 65A and 15A. What is the total load? Assume that there are no dwellings or motors.

82A

129.6A

117A

162A

Question 5 of 30

6. An optional method for determining feeder to schools is covered in ________.

NEC® Section 220.102

NEC® Article 555

NEC® Table 220.88

NEC® Section 220.86

Question 6 of 30

7. What is the load center length for a tapped feeder with loads of 120A at 50', 110A at 60', 75A at 90', and 70A at 150'?

75.15'

72.75'

79.60'

81.24'

Question 7 of 30

8. What is the load for 40 non-dwelling unit receptacles (assume that the load is not continuous)?

5,400VA

7,000VA

7,200VA

6,750VA

Question 8 of 30

9.

Refer to the figure above. What is the total load of a feeder serving four 230V motors rated 5hp, 15hp, 20hp, and 40hp?

241.2

90A

215.2

80A

Question 9 of 30

10. What is the feeder ampacity for a three -phase, 120/208V subpanel with a connected load of 84,563VA?

294A

235A

200A

407A

Question 10 of 30

11. If a continuous connected load totals 120A, what is the minimum current-carrying capacity required for the feeder?

154A

170A

150A

182A

Question 11 of 30

12. When the overcurrent protection for a conductor is located on the load end rather than the supply side of a conductor it is considered to be a(n) ________.

grounding electrode

unprotected conductor

tap conductor

drain wire

Question 12 of 30

13. The smallest size locking and grounding type receptacle that may be used to provide shore power for boats is ________.

30A

15A

25A

20A

Question 13 of 30

14. The minimum ampacity for a feeder supplying ten 30A shore power receptacles in a marina is ________.

240A

30A

120A

300A

Question 14 of 30

15. If a store lighting load is 14,000VA (continuous), which of the following must be used for the circuit calculation?

17,500VA

19,250VA

15,750VA

20,000VA

Question 15 of 30

16. The interior lighting load for a school building with 175,000 square feet of floor space is ________.

525,000VA

700,000VA

175,000VA

350,000VA

Question 16 of 30

17. If the number of current-carrying conductors in a conduit exceed three, the ampacity of the conductors must be adjusting using ________.

NEC® Table 220.3

NEC® Table 310.15(B)(16)

NEC® Table 310.15(C)(1)

NEC® Table 310.16

Question 17 of 30

18. Residential small appliance circuits must be rated at ________.

2,400VA

1,200VA

1,500VA

1,920VA

Question 18 of 30

19. Use of the 100' tap rule is limited to installation in high-bay manufacturing buildings with wall heights over ________.

20 feet

35 feet

40 feet

15 feet

Question 19 of 30

20. The minimum service rating for a residential service is ________.

125A

30A

60A

100A

Question 20 of 30

21. When performing load calculations for farm buildings, the load that must be included in the calculation at 100% demand must be at least ________.

240A

60A

120A

30A

Question 21 of 30

22. Which part of a residential lighting and small appliance load must be rated at 35% for service calculations?

The next 125,000VA

The first 1,00VA

The first 500VA

The next 117,000VA

Question 22 of 30

23. What is the demand factor allowed by the NEC® for calculating the neutral conductor size for an electric range load?

125%

100%

70%

80%

Question 23 of 30

24. The allowable ampacity of a conductor run in a raceway with four to six conductors must be reduced by ________.

50%

75%

80%

60%

Question 24 of 30

25. The rules governing the design of circuits supplying power to boats is covered in ________.

NEC® Article 555

NEC® Article 215

NEC® Article 550

NEC® Article 220, Part V

Question 25 of 30

26. Which of the following lighting loads would be used in a residence that is 1,650 sq ft?

5,900VA

4,225VA

4,950VA

5,150VA

Question 26 of 30

27. Before it is considered a continuous load, a load must operate for at least how many hours without interruption?

24

10

12

3

Question 27 of 30

28.

Refer to the figure above. What is the total load a feeder serving four 2hp motors, three 5hp motors, one 15hp motor, and one 25hp motor? All motors are 208V.

50A

201.1A

219.8A

145.2A

Question 28 of 30

29. Feeder conductor size is adjusted when ________.

the ambient temperature that the conductors will pass through is more than 30∘C (86°F.

there is a 2% voltage drop

there are more than three current-carrying conductors in the raceway

the load to be supplied is a noncontinuous duty load

Question 29 of 30

30. A farm has three buildings with loads of 85.3A, 55A, and 30A. How many amps of this load will be subject to a 50% demand factor?

80.3A

55A

60A

85A

Question 30 of 30

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