Electrical 2; MOD 10
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
