How must the grounding conductor terminal on a receptacle or switch typically be identified?

The grounding conductor terminal on a receptacle or switch is typically identified by its green color, which is a universal standard in electrical installations to indicate grounding components. This identification helps to ensure safety and proper connections in electrical systems.

Each of the options provided—green-colored hexagonal terminal nut, green-colored pressure wire connector, and green-colored terminal screw—serves as a means to connect grounding conductors safely and effectively. The green color is a visual cue for electricians and installers that helps prevent mistakes in wiring, thereby facilitating safe electrical installations and maintenance practices.

Since all three items can indeed serve as grounding connectors when they are colored green, the correct choice encompasses that any of these can be used to identify the grounding conductor terminal. Hence, it's accurate to say that all of the above are appropriate identifiers for grounding conductors in electrical systems.