Overcurrent Protection Questions and Solutions | Grade A+
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Course
Overcurrent protection
Institution
Overcurrent Protection
The current-carrying capacity of an overcurrent protective device. The fuse or circuit breaker
is subjected to a current above its ampere rating; it will open the circuit after a predetermined
period of time.
️: Ampere rating
Choose the correct statement.
A short circuit results from placi...
Overcurrent Protection Questions and
Solutions | Grade A+
The current-carrying capacity of an overcurrent protective device. The fuse or circuit breaker
is subjected to a current above its ampere rating; it will open the circuit after a predetermined
period of time.
✔️: Ampere rating
Choose the correct statement.
A short circuit results from placing too many loads on a circuit.
An overload current can be caused by worn motor bearings.
Sustained overloads will not damage equipment or conductors as long as they do not exceed
125% of normal current.
✔️: An overload current can be caused by worn motor bearings.
An overload is excess current up to 6 times normal. Bad motor bearings can cause the motor
to draw excess current.
, The effective value of an AC sine wave, which is calculated as the square root of the average
of the squares of all the instantaneous values of the voltage throughout one cycle. Alternating
current rms is that value of an alternating current that produces the same heating effect as a
given DC value.
✔️: Root-mean-square (rms)
A component short circuit rating is the _____.
voltage value at which arcing will occur in the component
current value at which the device will trip
current value which, if exceeded, will likely damage the component
✔️: current value which, if exceeded, will likely damage the component
The component short circuit rating is a maximum current rating given to conductors,
switches, circuit breakers, and other components which, if exceeded, will result in component
damage
Between 1 and 6 times the normal current level, caused by temporary surge currents when
motors are started up or transformers are energized.
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