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

Red

Black

White

Blue

Question 1 of 15

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

given current ranges

normal ambient temperatures

line and load terminals

solid-state circuitry

Question 2 of 15

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

UL and NEMA

CSA and UL

OSHA and NEMA

IEEE

Question 3 of 15

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

safety switches and load centers

Edison-base fuses and time-delay devices

heaters and blowers

circuit breakers and fuses

Question 4 of 15

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

Large-scale detail

Single-line schematic

Building elevation drawing

Floor plan

Question 5 of 15

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

They can be used in circuits other than motor branch circuits and feeders, such as lighting circuits.

They have a low speed of response to short circuit currents.

They can be applied in circuits subject to temporary motor overload.

They have a high speed of response to overcurrents.

Question 6 of 15

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

Nonfeed-through

Unlisted

Solid-state

Feed-through

Question 7 of 15

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

in the panelbox

on the bottom

on the side

on the handle

Question 8 of 15

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

800A

1,000A

600A

700A

Question 9 of 15

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

10,000A

65,000A

15,000A

5,000A

Question 10 of 15

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

Class A

Class B

Class H

Class R

Question 11 of 15

12. NEC Article 240 covers which of the following?

Nontime-delay fuses

Overcurrent protection

Plug fuses

Ampere rating

Question 12 of 15

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

Coordination

Switched

Nonrenewable

Dual-element

Question 13 of 15

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

interrupting rating

dimensions

date manufactured

expiration

Question 14 of 15

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

10,000A

5,000A

65,000A

30,000A

Question 15 of 15

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