Exam 28: Overcurrent Protectionfuses and Circuit Breakers

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

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

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

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

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

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

All new plug fuse installations shall be ____________________ fuses.

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

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

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

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.

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

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

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

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

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

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.

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

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

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