What should be followed for grounding systems connected on the supply side of the service disconnect?

The correct choice is based on the requirements outlined in the National Electrical Code (NEC), specifically Articles 250.24 and 250.25, which detail the grounding and bonding standards for electrical installations. These sections provide specific guidelines that must be followed for grounding systems that are connected on the supply side of the service disconnect.

Article 250.24 discusses the grounding of service equipment, emphasizing that grounding methods must ensure a low-resistance path for fault currents and provide adequate protection for persons and property from electrical shocks. It establishes the criteria for grounding electrodes and the connection to the grounding system.

Article 250.25 addresses the connection of separate buildings or structures to the grounding system of the main service. It outlines requirements for grounding conductors and connections to ensure safety and effectiveness.

By adhering to these specific requirements, electrical systems can be properly grounded to reduce the risk of electrical shock and fire, thereby enhancing the safety and reliability of the electrical system. Hence, following the guidelines provided in these articles is essential for maintaining compliance with the NEC and ensuring a safe electrical installation.