NEC Commercial Electrical Practice Test

What color should the identification of terminals connected to grounded conductors be?

1. Green

2. Black

3. White

4. Red

The correct answer is: White

The identification of terminals connected to grounded conductors should be white. This is consistent with the National Electrical Code (NEC), which specifies that neutral conductors (i.e., grounded conductors) are to be identified by white or gray insulation. This standardization is important for safety and clarity in electrical installations, as it helps electricians and maintenance personnel quickly identify neutral conductors. Green is reserved for grounding conductors, black is typically used for ungrounded conductors, and red is often reserved for secondary or additional ungrounded conductors. Therefore, using white for grounded conductors helps maintain a clear and consistent understanding of the wiring system, significantly reducing the risk of errors during installation, maintenance, or troubleshooting.