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26305-11 Overcurrent Protection

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

Question 1 of 15

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

Question 2 of 15

3. 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 3 of 15

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

Question 4 of 15

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

Question 5 of 15

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

Question 6 of 15

7. Circuit breakers are classified by ________.

Question 7 of 15

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

Question 8 of 15

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

Question 9 of 15

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

Question 10 of 15

11. 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 11 of 15

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

Question 12 of 15

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

Question 13 of 15

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

Question 14 of 15

15. Overcurrent protection is covered in ________.

Question 15 of 15


 

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