Question 1

What is the NEC definition of 'overcurrent'?

Accepted Answer

Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault.

Question 2

What is the difference between an overload and a short circuit?

Accepted Answer

An overload is excess current flowing in a normal path (e.g., too many loads), while a short circuit is an abnormally low-resistance connection between conductors that causes very high fault current.

Question 3

What does the term 'ampacity' mean as it relates to overcurrent protection?

Accepted Answer

Ampacity is the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

Question 4

What is an 'inverse time' circuit breaker?

Accepted Answer

A circuit breaker that has an intentional delay in its tripping time that decreases as the magnitude of the overcurrent increases — higher fault currents trip it faster.

Question 5

What is the purpose of an overcurrent protective device (OCPD)?

Accepted Answer

To open the circuit automatically when current exceeds the device's rating, protecting conductors and equipment from damage due to heat or fault current.

Overcurrent Protection – Electrician Journeyman Exam

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