The impassivity of a number 6 AWG copper THHN conductor terminated in a switchboard rated at 75° C is how many amps?

The ampacity of a 6 AWG copper THHN conductor is determined by the temperature rating and relevant codes, specifically the National Electrical Code (NEC). For conductors rated at 75° C, a 6 AWG copper conductor is typically rated for 65 amps under standard conditions.

It's essential to note that this rating accounts for normal operating conditions, which include factors such as conductor insulation type, ambient temperature, and the number of conductors bundled together. The specific focus here is on the standard ampacity for 6 AWG copper THHN conductors terminated in environments that allow for a 75° C rating.

In this scenario, the correct answer is based on the commonly accepted ampacity for copper conductors under the given conditions, making it evident that the choice of 65 amps directly aligns with industry standards for 75° C rated conductors. Therefore, selecting 65 amps as the correct response reflects an understanding of electrical code regulations and proper conductor sizing for safe electrical installations.