OSHA 10 Hour Construction Program Practice Test

What is indicated by a green wire or one with yellow stripes?

1. A grounding conductor wire

2. An insulating conductor wire

3. A conductor used solely for lighting

4. A power supply conducting wire

The correct answer is: An insulating conductor wire

The correct designation for a green wire or one with yellow stripes is that it indicates a grounding conductor wire. This color coding is important in electrical systems as it helps to ensure safety and proper functioning of electrical equipment. Grounding wires are critical for preventing electrical shock and ensuring that excess electrical current is safely directed into the ground, thereby protecting both equipment and individuals from potentially dangerous voltage levels. In general, the yellow stripe shows that the wire functions as a grounding conductor, which is an essential component of electrical safety. Identifying wires by their color helps electricians and workers quickly understand their function without needing to inspect the wiring system in depth. This standardization is part of various electrical codes that aim to prevent accidents and ensure proper installation practices across the industry.