Where should the service neutral connection be made on a wye/wye 120/208 bank?

In a wye/wye 120/208 bank, the service neutral connection should be made directly to the secondary ground bus. This is essential for establishing a reliable ground reference for the neutral conductor, which helps to ensure the safety and proper operation of the electrical system. The ground bus serves as a common points of connection for grounding various electrical equipment and systems, providing a pathway for fault currents to safely return to the earth, minimizing the risk of electrical shock or fire hazards.

Additionally, making the neutral connection to the secondary ground bus helps in maintaining voltage stability across the phases and reduces the risk of voltage imbalances, which can result in equipment damage or malfunction. This connection ensures that the neutral is effectively grounded, allowing for protection against fault conditions while also facilitating the safe operation of residential and commercial electrical systems fed by the transformer bank.