Which factor must be considered when determining the conductor size for EVSE?

When selecting the appropriate conductor size for Electric Vehicle Supply Equipment (EVSE), it is crucial to consider both the current rating and ambient temperature. The current rating is essential because it determines how much electrical current the conductor can safely handle without overheating. If the current exceeds the capacity of the conductor, it could lead to insulation damage or even electrical fires.

Ambient temperature plays a significant role as well because it affects the conductor's resistance to heat. Higher temperatures can reduce the conductor's current-carrying capacity, meaning it can safely handle less current than it would at a lower temperature. Therefore, when factoring in both current rating and ambient temperature, one can ensure that the chosen conductor will operate safely and efficiently under varying environmental conditions.

This comprehensive approach ensures that all variables that can impact performance and safety are addressed, which is essential in the context of electric vehicle charging systems where reliable and safe operation is paramount.