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26305-11 Overcurrent Protection

1. If a 120V feeder for nonmotor loads feeds a continuous load rated at 20A and a noncontinuous load at 30A, what size overcurrent protective device should be selected?

Question 1 of 15

2. Types of fault current include overloads, short circuits, ground faults, and ________.

Question 2 of 15

3. Which of the following are designed to withstand numerous trip and reset cycles without replacement and can be thermal, magnetic, or solid-state?

Question 3 of 15

4. Circuit breakers are classified by ________.

Question 4 of 15

5. Overcurrent protection is covered in ________.

Question 5 of 15

6. Which of the following is within the basic scope of Underwriters Laboratories?

Question 6 of 15

7. Which type of fuse should be used to prevent nuisance tripping from temporary motor overloads and surge currents?

Question 7 of 15

8. The branch circuit conductor and overcurrent protective device must be sized for the actual noncontinuous load plus what percentage of the continuous load?

Question 8 of 15

9. What is the maximum number of circuit breakers or sets of fuses that may be used as the service disconnecting means in a main service panel without a main switch?

Question 9 of 15

10. When selecting ampere ratings of fuses and circuit breakers, the most important consideration is the ________.

Question 10 of 15

11. Where are overcurrent protective devices normally installed in a branch circuit?

Question 11 of 15

12. If a continuous load on a branch circuit is measured at 40A, the overcurrent protection should be sized at ________.

Question 12 of 15

13. UL Class R fuses have a short circuit interrupting rating of up to ________.

Question 13 of 15

14. Which of the following is true of the voltage rating of a fuse?

Question 14 of 15

15. Which of the following is commonly referred to as motor branch circuit protection?

Question 15 of 15


 

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