Is a snap switch with an integral nonmetallic enclosure required to be connected to an equipment grounding conductor?

A snap switch with an integral nonmetallic enclosure does not need to be connected to an equipment grounding conductor because these switches are typically designed to be inherently insulated and not to require grounding. The lack of metal components in the enclosure means there is no path for a ground fault current to flow back to the ground, which eliminates the need for grounding.

In general, nonmetallic enclosures are meant to provide isolation from conductive parts, minimizing the risk of electrical shock. As a result, connecting them to a grounding conductor is not mandated, thus supporting the accuracy of the chosen answer.