What is the requirement for a grounded conductor in a grounded separately derived AC system?

In a grounded separately derived AC system, the requirement that the grounded conductor shall not be reconnected to ground on the load side of the system bonding jumper is crucial for ensuring electrical safety and system integrity.

This rule is in place to maintain the effectiveness of grounding and bonding, which are essential for protecting both equipment and personnel from electric shock and ensuring proper operation of overcurrent devices. By preventing the grounded conductor from being reconnected to ground beyond the bonding jumper, the system maintains a clear and defined path for fault currents back to the source, allowing for overcurrent protection devices to operate correctly in the event of a fault.

This practice also minimizes the risk of ground loops and unintended ground paths, which could lead to unsafe conditions and equipment malfunctions. Maintaining this separation helps to establish a reliable and safe grounding system that enhances the overall performance and safety of the electrical installation.