When relocating a subpanel, and the feeder conductors increased to 350 kcmil, what is the minimum size equipment grounding conductor permitted?

When determining the minimum size for the equipment grounding conductor (EGC) when relocating a subpanel, it's important to refer to the National Electrical Code (NEC) guidelines. The NEC provides tables that outline the requirements for EGC sizing based on the size of the feeder conductors.

In this scenario, with feeder conductors increased to 350 kcmil, the relevant NEC table indicates that for feeders of this size, the minimum size of the equipment grounding conductor must be at least 1 AWG. This size ensures adequate grounding to protect against electrical faults and enhance the safety of the installation.

The larger conductor size provides a more effective path for fault currents, reducing the likelihood of overheating and ensuring reliable operation of overcurrent protective devices. Grounding conductors must be appropriately sized to ensure they can handle the maximum fault current they may be subjected to, thereby playing a crucial role in the overall safety of the electrical system.