Can a single grounding conductor serve multiple circuits according to NEC?

The correct answer is that a single grounding conductor can indeed serve multiple circuits, provided that the proper sizing and bonding requirements are met according to the National Electrical Code (NEC). This means that when multiple circuits are grounded through a single grounding conductor, the conductor must be adequately sized to handle the combined fault current of all the connected circuits.

Additionally, all grounding conductors must be bonded back to the main grounding system, ensuring that there is a low-resistance path for fault currents, which is crucial for the safety and functionality of the electrical system.

It's important to note that this flexibility in using a single grounding conductor for multiple circuits is advantageous in terms of reducing material costs and simplifying the installation process, while still maintaining compliance with safety standards when done correctly.