Electrical 2; MOD 10

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A​ 2,000A frame circuit breaker has a range of​ _____.

1200A- 2000A

What is the highest voltage rating for circuit breakers used on DC systems that UL​ recognizes?

600V

Which of the following best describes where the NEC​® allows the use of​ Edison-base fuses?

for replacements in existing installations

Circuit breakers have​ _____ type(s) of current ratings.

two

It is important that all circuit components be compatible as far as

voltage and current ratings are concerned.

What is normally the highest short circuit current in residential​ applications?

10,000A

In a feeder circuit with no motor​ load, a​ time-delay fuse must be sized for​ _____ percent of the continuous load.

125

Type S plug fuses are available with capacities up to​ _____ amps.

30

What must be used in conjunction with Type S plug fuses when they are installed in a fuse​ holder?

a type S adapter

The term AIC refers to the​ _____.

amperage interrupting capacity

NEC Section 240.85 covers circuit breaker​ _____.

applications

When a circuit breaker​ trips, its handle moves to the​ _____ position.

center

In a system in which selective coordination is​ applied, the protective device​ _____ the fault source will open first.

closest to

Where is the ampere rating normally marked on circuit​ breakers?

on the handle

Which of the following is the most important consideration when working with overcurrent protection​ devices?

the correct interupting capacity

The​ current-limiting mechanism of a current limiting circuit breaker reacts

instantaneously to a large fault current.

On renewable cartridge​ fuses, which part of the fuse is normally​ renewed?

link

If a conductor is rated for 15​ amps, the fuse should be

no larger than 15 amps

Single-element cartridge fuses respond rapidly to

short circuit currents

The conventional mechanism opens when

the fault current has been dissipated.

Every circuit breaker must have its interrupting rating shown on the circuit​ breaker, unless it is rated for​ _____.

5,000A

Which of the following best describes a​ dual-element fuse?

A fuse having an overcurrent limit and a time delay before activation

A GFCI will open a circuit if a current imbalance of

greater than 6 mA is detected

When a common​ molded-case circuit breaker​ trips, in which position will the operating handle​ be?

halfway between the on and off positions

The voltage rating of a fuse in a circuit can be​ _____ than the circuit voltage.

higher


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