What is the calculated minimum size of XHHW-2 copper conductor for a Level II EVSE with a 30-ampere rating?

To determine the minimum size of XHHW-2 copper conductor for a Level II Electric Vehicle Supply Equipment (EVSE) with a 30-ampere rating, it's essential to refer to the National Electrical Code (NEC) and the ampacity table for conductors.

In typical applications, a 30-ampere circuit generally requires a conductor that can safely handle that level of continuous current. For copper conductors, based on the NEC, 10 AWG is rated for 30 amperes under standard conditions. However, when considering additional factors such as the conductor's insulation type, the ambient temperature, and potential voltage drop over distance, a larger conductor may be recommended for optimal performance.

Specifically, XHHW-2 is an insulation type rated for higher temperature applications, and it may allow for slightly different ampacity considerations than standard wire types. Additionally, in practical situations, code compliance often suggests going a step higher for safety and performance, especially with continuous loads. As a result, upgrading to an 8 AWG conductor is a prudent choice for a 30-ampere load to manage potential issues such as heat buildup or voltage drop effectively.

Thus, the choice of 8 AWG is justified as it provides