According to the NEC, the ampacity of capacitor circuit conductors should not be less than what percentage of the rated current of the capacitor?

The requirement regarding the ampacity of capacitor circuit conductors aligns with the National Electrical Code (NEC) guidelines for ensuring safe and reliable operation of electrical systems. For capacitor circuits, the NEC stipulates that the ampacity of the conductors must be no less than 135% of the rated current of the capacitor. This specific percentage is crucial to account for the potential inrush currents that occur when a capacitor is energized, as well as to accommodate variations in ambient temperature and other operational factors that could influence the conductors' performance.

By setting the ampacity at 135%, the Code aims to provide a safety margin that ensures the conductors can handle the increased load without overheating, thereby minimizing the risk of insulation damage, fire hazards, or failure of the equipment. This standard helps to uphold the integrity of the electrical system and promotes effective protection against potential failures, ensuring both safety and efficiency in operation.