In my garage if I check my receptacles with a gci outlet tester it says there is no grounding. There is no gren wire but it’s all conected with EMT. The electrician who did it a few years back he said just put a copper rod in the soil 10’ deep and connect everything to that and you will have grounding. Is it the correct way ? I guess that won’t trip my breaker and won’t disconnect the power if there is a ground fault.