In which part of the AC service disconnecting means can a grounded circuit conductor be permitted?

In an AC service disconnecting means, the grounded circuit conductor is permitted on the supply side. This is essential as the grounded conductor, often referred to as the neutral, serves a critical function in an electrical system by providing a return path for current and ensuring stability in voltage levels.

On the supply side, the grounded conductor is typically connected to the grounding system. This helps establish a reference point for the entire circuit and enhances safety by providing a pathway for fault currents. Proper placement on the supply side also ensures that the disconnecting means can effectively isolate both the ungrounded conductors and the grounded conductor from the electrical service.

Positioning the grounded conductor on the load or neutral sides could potentially lead to safety hazards, such as the risk of electric shock or improper operation of overcurrent devices. Therefore, keeping it on the supply side aligns with established electrical standards and practices, ensuring both safety and reliability in the electrical system's operation.