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26401-11 Load Calculations 2

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

Question 1 of 30

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

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 ________.

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)?

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.

Question 5 of 30

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

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'?

Question 7 of 30

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

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?

Question 9 of 30

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

Question 10 of 30

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

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) ________.

Question 12 of 30

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

Question 13 of 30

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

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?

Question 15 of 30

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

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 ________.

Question 17 of 30

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

Question 18 of 30

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

Question 19 of 30

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

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 ________.

Question 21 of 30

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

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?

Question 23 of 30

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

Question 24 of 30

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

Question 25 of 30

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

Question 26 of 30

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

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.

Question 28 of 30

29. Feeder conductor size is adjusted when ________.

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?

Question 30 of 30