What is NOT part of the definition of ampacity?

Ampacity is defined as the maximum amount of electric current a conductor or device can carry before sustaining immediate or progressive deterioration. This concept primarily focuses on the continuous current-carrying capacity, ensuring the conductor operates safely and efficiently without overheating.

The definition of ampacity includes several factors:

• Carrying current continuously is a fundamental aspect, as ampacity primarily refers to the continuous load a conductor can handle without exceeding its safe temperature rating.

• The ability to carry current without exceeding the temperature rating is essential, as this rating ensures that the conductor will not degrade due to excessive heat generated by the electrical current flowing through it.

Given these core definitions, the ability to handle reverse current is not a standard aspect of ampacity. While some applications may require conductors to handle reverse current under specific conditions, this characteristic does not define the ampacity itself.

Carrying current intermittently, as indicated in the question, also does not fall under the standard parameters for defining ampacity. Ampacity typically relates to continuous current flow, not intermittent usage, which may alter thermal dynamics and the overall lifespan of the conductor. In summary, while intermittent current flow is a practical consideration for an electrical system, it does not fundamentally describe ampacity.