When separate services or feeders are supplied to a building, what should be used for grounding electrodes?

When separate services or feeders are supplied to a building, using the same grounding electrodes is essential to ensure a common grounding system. This approach helps in maintaining the safety and performance of the electrical system by providing a low-resistance path to ground for all electrical currents, including fault currents.

Utilizing the same grounding electrodes for multiple services minimizes the risk of voltage differences between grounding systems, which can occur if different electrodes are used. Such voltage differences could create potential shock hazards and interfere with the operation of electrical equipment. A unified grounding system also simplifies compliance with regulatory standards and guidelines, such as the National Electrical Code (NEC), which emphasizes the importance of a common grounding point for safety and reliability.

In summary, employing the same grounding electrodes for separate services or feeders enhances the safety and functionality of the electrical system by ensuring proper fault current management and reducing the likelihood of electrical shock or equipment damage.