Question 1

Circuit breakers with an interrupting rating other than ____ shall have this rating marked on the breaker.

Accepted Answer

A)   100 amperes
B)   5000 amperes
C)   10,000 amperes
D)   none of the aboveE) None of the above
F) A) and D)

Question 2

With a ____ fuse, one fuse element opens quickly when a short circuit, heavy overload, or ground fault occurs, and the other element in series with the first element opens slowly on overload conditions.

Accepted Answer

A)   time-delay, dual-element
B)   time-delay, loaded link
C)   nontime-delay
D)   nontime-delay, single elementE) C) and D)
F) A) and D)

Question 3

A(n)  ____ is a condition where two or more conductors come into contact with one another.

Accepted Answer

A)   ground fault
B)   short circuit
C)   overload
D)   openE) A) and C)
F) None of the above

Question 4

Fuses are not a reliable or economical form of overcurrent protection.

Accepted Answer

A) True 
 B)False

Question 5

All new plug fuse installations shall be ____________________ fuses.

Accepted Answer

The answer of All new plug fuse installations shall be...

Question 6

A(n)  ____ is a condition where a hot conductor comes into contact with a grounded surface.

Accepted Answer

A)   ground fault
B)   short circuit
C)   overload
D)   openE) None of the above
F) A) and B) A

Question 7

The maximum ampere rating of a Type S fuse is ____.

Accepted Answer

A)   15
B)   20
C)   30
D)   60E) B) and C)
F) A) and D) C

Question 8

The term ____________________ refers to how long it will take a fuse or circuit breaker to open under different current values.

Accepted Answer

time-current

Question 9

Current-limiting overcurrent devices will limit the amount of ____________________ by opening so fast that the full value of fault-current will not be reached

Accepted Answer

let-throug...

Question 10

____ fuses are special-purpose fuses that are found in original equipment, or in commercial and industrial panelboards, multimetering equipment, and motor controllers.

Accepted Answer

A)   Class BB, Class A, and Class D
B)   Class CC, Class G, and Class T
C)   Class G, Class UU, and Class T
D)   Class CH, Class I, and Class TE) B) and D)
F) All of the above

Question 11

A(n) ____________________ is a condition where the current flowing in a circuit is more than the current or equipment is designed to handle.

Accepted Answer

The answer of A(n) ____________________ is a condition where the...

Question 12

A(n) ____________________ is a condition where a hot conductor comes into contact with a grounded surface.

Accepted Answer

The answer of A(n) ____________________ is a condition where a...

Question 13

____________________ loading of a circuit is when the current flowing is within the capability of the circuit and/or the connected equipment.

Accepted Answer

The answer of ____________________ loading of a circuit is when...

Question 14

Cartridge fuses are available in Class H and Class R types.

Accepted Answer

A) True 
 B)False

Question 15

Plug fuses shall have a(n)  ____ configuration somewhere on the fuse when rated at 15 amperes or less.

Accepted Answer

A)   rectangular
B)   octagonal
C)   square
D)   hexagonalE) B) and C)
F) A) and D)

Question 16

Identified handle ties are permitted to disconnect all conductors of a service as long as it takes no more than ____________________ operations of the hand to shut everything off.

Accepted Answer

The answer of Identified handle ties are permitted to disconnect...

Question 17

A(n) ____________________ is a condition where two or more conductors come into contact with one another.

Accepted Answer

The answer of A(n) ____________________ is a condition where two...

Question 18

A(n)  ____ is a condition where the current flowing in a circuit is more than the current or equipment is designed to handle.

Accepted Answer

A)   ground fault
B)   short circuit
C)   overload
D)   openE) None of the above
F) A) and B)

Question 19

Overcurrent protection for residential services, branch circuits, and feeders is provided by circuit breakers or fuses. These are the "____" of an electrical circuit.

Accepted Answer

A)   life forces
B)   backup
C)   safety valves
D)   none of the aboveE) A) and B)
F) C) and D)

Question 20

Nontime-delay fuses are not the best choice for motor circuits because of the high starting inrush current of motors.

Accepted Answer

A) True 
 B)False

Exam 28: Overcurrent Protectionfuses and Circuit Breakers

Circuit breakers with an interrupting rating other than ____ shall have this rating marked on the breaker.

Correct AnswerverifiedShow Answer

With a ____ fuse, one fuse element opens quickly when a short circuit, heavy overload, or ground fault occurs, and the other element in series with the first element opens slowly on overload conditions.

Correct AnswerverifiedShow Answer

A(n) ____ is a condition where two or more conductors come into contact with one another.

Correct AnswerverifiedShow Answer

Fuses are not a reliable or economical form of overcurrent protection.

Correct AnswerverifiedShow Answer

All new plug fuse installations shall be ____________________ fuses.

Correct AnswerverifiedShow Answer

A(n) ____ is a condition where a hot conductor comes into contact with a grounded surface.

Correct AnswerverifiedA

The maximum ampere rating of a Type S fuse is ____.

Correct AnswerverifiedC

The term ____________________ refers to how long it will take a fuse or circuit breaker to open under different current values.

Correct Answerverifiedtime-current

Current-limiting overcurrent devices will limit the amount of ____________________ by opening so fast that the full value of fault-current will not be reached

Correct Answerverifiedlet-throug...View AnswerShow Answer

____ fuses are special-purpose fuses that are found in original equipment, or in commercial and industrial panelboards, multimetering equipment, and motor controllers.

Correct AnswerverifiedShow Answer

A(n) ____________________ is a condition where the current flowing in a circuit is more than the current or equipment is designed to handle.

Correct AnswerverifiedShow Answer

A(n) ____________________ is a condition where a hot conductor comes into contact with a grounded surface.

Correct AnswerverifiedShow Answer

____________________ loading of a circuit is when the current flowing is within the capability of the circuit and/or the connected equipment.

Correct AnswerverifiedShow Answer

Cartridge fuses are available in Class H and Class R types.

Correct AnswerverifiedShow Answer

Plug fuses shall have a(n) ____ configuration somewhere on the fuse when rated at 15 amperes or less.

Correct AnswerverifiedShow Answer

Identified handle ties are permitted to disconnect all conductors of a service as long as it takes no more than ____________________ operations of the hand to shut everything off.

Correct AnswerverifiedShow Answer

A(n) ____________________ is a condition where two or more conductors come into contact with one another.

Correct AnswerverifiedShow Answer

A(n) ____ is a condition where the current flowing in a circuit is more than the current or equipment is designed to handle.

Correct AnswerverifiedShow Answer

Overcurrent protection for residential services, branch circuits, and feeders is provided by circuit breakers or fuses. These are the "____" of an electrical circuit.

Correct AnswerverifiedShow Answer

Nontime-delay fuses are not the best choice for motor circuits because of the high starting inrush current of motors.

Correct AnswerverifiedShow Answer

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A

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C

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time-current

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let-throug...
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