What color is the third wire used for grounding in portable electric power tools?

The third wire used for grounding in portable electric power tools is typically green. This color coding is standardized to ensure safety and consistency in electrical wiring. The purpose of the grounding wire is to provide a safe path for electricity to return to the ground in case of a fault or short circuit, preventing electric shock or electrical fires. The use of green makes it easily identifiable, distinguishing it from the other wires that carry power.

In electrical systems, different wire colors indicate different functions: black or red wires are commonly used for power (live wires), while blue might be used for specific functions in various contexts but is not standard for grounding. This color-coded system is vital for users to quickly recognize the function of each wire, ensuring safety during operation and maintenance of electrical tools.