Which is an acceptable way to identify the equipment grounding conductor terminal on a duplex receptacle?

Identifying the equipment grounding conductor terminal on a duplex receptacle is essential for proper electrical safety and compliance with standards. The marking standard requires that this terminal be easily distinguishable from other terminals to avoid confusion during installation or maintenance.

The use of the letters "G" or "GR" is widely recognized and serves as a clear designation for the grounding terminal. This marking convention helps electricians and anyone working with electrical systems to quickly and accurately identify the grounding connection, ensuring that the grounding conductor is correctly attached and providing the intended safety functions.

In contrast, other options such as color-coded markings or symbols may not universally indicate a grounding terminal, leading to potential misunderstanding. For example, a red finish could be confused with other uses in electrical applications, and a yellow grounding symbol, while potentially recognized in some contexts, may not have the same standard acceptance or clarity as the direct labeling of "G" or "GR". A blue sticker lacks any established significance in the context of grounding conductors, making it an unreliable choice.

Therefore, using the letters "G" or "GR" provides a standardized and clear method for identifying the equipment grounding conductor terminal, promoting safety and compliance with electrical code requirements.