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 Edison-base fuses are outdated and should not be used in new installations.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