Always use #6 AWG bare copper wire for outdoor grounding to meet National Electric Code requirements and pass inspections. This simple yet critical detail can save you time, money, and headaches down the road. Need help? Achieve reliable electrical grounding with 12 AWG 8inch Stranded Wire grounding pigtail. This process involves two distinct but related concepts: system grounding, which provides a reference to earth for the electrical system (stabilizing. If yes, do I ground it by driving a grounding rod into the ground beside the array and running a bare copper wire from one panel down to the rod in the ground? Do I need to connect all panels using the bare copper wire? Or, do I not ground at all, and run the ground in the trench with the PV wires. ty at the installation. The system contains various lass filled polyester. SOLARLOK, TE, TE Connectivity, and the TE connectivity (logo) are trademarks of the TE Connectivity. Other logos, product and Company names mentioned herein may be trademarks of t, reliable. A PV system grounding diagram is a dedicated part of the solar plan set that shows how all metallic parts of the system are electrically connected to the earth or a grounding point.