circuit breaker and fuses

What is normally the highest short circuit current in residential applications

10,000

The smallest standard circuit breaker size is __________.

15 A

Every circuit breaker must have its interrupt-ing rating shown on the circuit breaker, un-less it is rated for _____

5,000

What is the highest voltage rating for cir-cuit breakers used on DC systems that UL recognizes?

600

True or False? Edison-base fuses are outdated and should not be used in new installations.

True

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

a type S adapter

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

for replacements in existing installations

A ground fault circuit interrupter will trip when a fault current __________.

is 6 mA or more

Where is the ampere rating normally marked on circuit breakers?

on the handle

A current-limiting circuit breaker provides downstream protection for __________.

other types of overcurrent protective devices

Each ungrounded service-entrance conductor shall have a(n) __________ in series with a rating not higher than the ampacity of the conductor.

overcurrent device

A dual-element fuse can be applied in circuits to provide both short circuit and __________

overload

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

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

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

For replacements in existing installations

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

Halfway between the On and Off positions

A standard circuit breaker contains __________.

all of the above

An overcurrent condition can be defined as __________.

ither an overload or a short circuit current

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

link

The amperage interrupting capacity (AIC) is the __________.

maximum short circuit current at which the breaker will safely interrupt the circuit.

Coordination is the name given to the __________.

time-current relationship of overcurrent devices connected in series with each other