What is required for a feeder to be derived from an autotransformer?

For a feeder to be appropriately derived from an autotransformer, it's essential to connect a grounded conductor to the autotransformer ground. This ensures that the electrical system maintains safety and stability during operation. Proper grounding is crucial for reducing the risk of electrical shock and ensuring that any fault conditions are effectively managed. When a feeder is sourced from an autotransformer, providing a grounded conductor helps establish a clear reference point for the electrical system, facilitates the operation of overcurrent protective devices, and contributes to overall system reliability.

Establishing a direct connection to the autotransformer ground through a grounded conductor also helps in maintaining the balance of the system and supports compliance with the National Electrical Code (NEC), promoting safe electrical practices. The integration of a grounded conductor with the autotransformer enhances the system's ability to handle faults safely and efficiently.