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26210-11 Circuit Breakers and Fuses

1. The normal current rating of a circuit breaker is located ________.

Question 1 of 15

2. The two most common types of overcurrent protective devices are ________.

Question 2 of 15

3. Circuit breakers are grouped for identification according to ________.

Question 3 of 15

4. A current-limiting circuit breaker performs in a manner similar to conventional thermomagnetic circuit breakers at currents below a threshold of about ________.

Question 4 of 15

5. The organization(s) that test and list circuit breakers is/are ________.

Question 5 of 15

6. In residential applications, the available ground fault circuit current is seldom higher than ________.

Question 6 of 15

7. Which of the following is defined by UL as a device that trips when a fault current to ground is 6mA or more?

Question 7 of 15

8. Cartridge fuses used for branch circuit protection must be marked with the ampere rating, voltage rating, and the ________.

Question 8 of 15

9. What color is printed on the labels of standard interrupting capacity circuit breakers?

Question 9 of 15

10. Which type of GFCI receptacle offers protection only at the point of installation?

Question 10 of 15

11. The interrupting rating of an FH-type circuit breaker is ________.

Question 11 of 15

12. Why are single-element fuses particularly suited for the protection of circuit breakers with low interrupting ratings?

Question 12 of 15

13. NEC Article 240 covers which of the following?

Question 13 of 15

14. Which of the following types of drawings helps when sizing fuses for a given application?

Question 14 of 15

15. What name is given to the time-current relationship among a number of overcurrent devices connected in series?

Question 15 of 15