NEC Commercial Electrical Practice Test

Conductors intended for use as ungrounded conductors must be what color?

1. Red

2. Black

3. Green

4. White

The correct answer is: Black

In the context of the National Electrical Code (NEC), ungrounded conductors are often marked by colors that clearly indicate their function and help ensure safety during installation and maintenance. Black is a color specifically designated for ungrounded conductors, as it allows electrical workers to quickly identify these conductors within an electrical system. This designation helps prevent errors that could arise from misconnections or inadvertent grounding, which could potentially lead to equipment failure or electrical hazards. Understanding the color-coding conventions is essential for anyone involved in electrical work, as it facilitates correct wiring practices and promotes safety. The NEC has established these color codes to standardize how conductors are identified, making it easier for professionals to ensure compliance during installations and troubleshooting.