I have a question about grounding. The scenario is my shop has a concrete floor with metal framing and siding. The panel is mounted to the wall via struts. A #2 Al ground wire is ran from the meter to the panel. I don't believe they ran a separate ground rod for the panel. I already have a ground rod right outside the building where we had some lightning rods installed. Am i going to hurt anything by running a ground wire from the panel grounding bar to the ground rod? It's going to cost me a few dollars for 6' of copper wire to do it and next to zero effort.
The building is concrete slab with rebar but no way to access it now. They installed metal weld plates into the wet concrete and welded the upright posts to them.
Grounding rods are fairly inexpensive. I think I will tie into the one for the lightning rods, tie the grounding lug inside the Panel to structural steel and bury one more rod in an open trench in digging today to lay line out to a sub panel
Thank you for your help