NEC Commercial Electrical Practice Test

What color triangle signifies an isolated grounding connection on a receptacle?

1. Blue

2. Green

3. Red

4. Orange

The correct answer is: Orange

The correct choice, which is orange, signifies an isolated grounding connection on a receptacle. In electrical systems, particularly in commercial settings, the use of color coding is vital for ensuring safety and compliance with the National Electrical Code (NEC). An isolated grounding connection is used primarily to reduce electrical noise and improve the performance of sensitive electronic equipment by providing a path to ground that is separate from regular grounding systems. This helps to minimize the risk of interference and provides a more stable environment for the equipment. The orange triangle indicates that this specific receptacle is equipped with an isolated ground. This visualization aids technicians and electricians in quickly identifying the purpose of the grounding connection without needing to investigate further. Such visual cues are essential for maintaining safe work practices and preventing potential errors in electrical installations and maintenance. Understanding these color codes and their implications is critical for anyone working in the field to ensure the safety and functionality of electrical systems.