26305-20 Level 3 Overcurrent Protection
Study online at https://quizlet.com/_g7cjsh
1. When tripped, where does the circuit breaker handle move?: between the on and
off positions
2. What is an event that occurs when a conductor with failed insulation con-
tacts the metal edge of a grounded metal wireway?: ground fault
3. In a branch circuit, where are overcurrent protective devices normally in-
stalled?: where the conductors receive their supply
4. Which is the recommended method of determining short circuit currents?-
: point-to-point method
5. Equipment intended to interrupt at fault current levels at the line terminals
of the equipment must be rated at what level?: 125% of the current available
6. The non-motor branch circuit conductor and overcurrent protective device
must be sized for the actual noncontinuous load plus what percentage of the
continuous load?: 125%
7. Who can certify the interrupting capacity rating of a circuit breaker?: UL
8. What does the thermal portion of a standard circuit breaker do?: provides an
instantaneous trip for high levels of current
9. Ungrounded service entrance conductors in other than dwelling locations
must have an overcurrent protection device in series with a rating that is which
of the following?: 125% of the ampacity of the conductor
10. If a non-continuous load on a lighting branch circuit is 16A,at what amper-
age rating must the overcurrent device be sized?: 20A
11. What does a stranded molded-case circuit breaker contain?: set of contacts and
thermal trip element
12. If a continuous load on a branch circuit is measured at 32 A at what
amperage rating should the overcurrent protection be sized: 40A
13. Which is the type of fuse used to prevent nuisance tripping from temporary
motor overloads and surge currents?: dual-element time-delay fuse
14. Which of the following is the primary consideration of underwriter's labo-
ratories?: safety
15. What are class j fuses rated to interrupt?: 200,000A
16. Which of the following is a type of fault current?: arc faults
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Study online at https://quizlet.com/_g7cjsh
1. When tripped, where does the circuit breaker handle move?: between the on and
off positions
2. What is an event that occurs when a conductor with failed insulation con-
tacts the metal edge of a grounded metal wireway?: ground fault
3. In a branch circuit, where are overcurrent protective devices normally in-
stalled?: where the conductors receive their supply
4. Which is the recommended method of determining short circuit currents?-
: point-to-point method
5. Equipment intended to interrupt at fault current levels at the line terminals
of the equipment must be rated at what level?: 125% of the current available
6. The non-motor branch circuit conductor and overcurrent protective device
must be sized for the actual noncontinuous load plus what percentage of the
continuous load?: 125%
7. Who can certify the interrupting capacity rating of a circuit breaker?: UL
8. What does the thermal portion of a standard circuit breaker do?: provides an
instantaneous trip for high levels of current
9. Ungrounded service entrance conductors in other than dwelling locations
must have an overcurrent protection device in series with a rating that is which
of the following?: 125% of the ampacity of the conductor
10. If a non-continuous load on a lighting branch circuit is 16A,at what amper-
age rating must the overcurrent device be sized?: 20A
11. What does a stranded molded-case circuit breaker contain?: set of contacts and
thermal trip element
12. If a continuous load on a branch circuit is measured at 32 A at what
amperage rating should the overcurrent protection be sized: 40A
13. Which is the type of fuse used to prevent nuisance tripping from temporary
motor overloads and surge currents?: dual-element time-delay fuse
14. Which of the following is the primary consideration of underwriter's labo-
ratories?: safety
15. What are class j fuses rated to interrupt?: 200,000A
16. Which of the following is a type of fault current?: arc faults
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