Which of the following wires is typically used for ground connections in electrical systems?

The green wire is standardized for ground connections in electrical systems. This color designation is recognized by the National Electrical Code (NEC) and is used to easily identify grounding wires in installations. Ground wires are crucial for safety, as they provide a path for electrical current to return to the ground in case of a fault, preventing potential electrical shock hazards or fire risks.

Using a green wire helps ensure that individuals working on electrical systems can quickly and accurately recognize grounding conductors, maintaining consistency across different installations. Fire safety regulations and electrical best practices emphasize the importance of clearly marking ground wires with specific colors to enhance safety and reduce the risk of mistakes during maintenance or installation.

The other colors mentioned, such as red, white, and black, are associated with other purposes: red is often used for secondary phase wiring, white is typically used for neutral conductors, and black is generally reserved for hot wires.