topaz420: My simplistic understanding of the purpose of an "equipment ground" on a electrical device is that it 1) be connected to all of the external metal parts of that device. And 2) the separate equipment ground wire in the receptacle should lead back eventually to a grounded electrode at your main breaker box. If this is properly done then normally a user touching any of those external metal parts can't get shocked from one of those metal parts being electrically energized, because the circuit breaker should have detected a short circuit condition and quickly tripped (since the equipment ground wire should have very low resistance).
My guess is that your EVSE outlet is not the only one on its circuit (like is highly recommended because it avoids the scenario I'm about to describe, among other things). If I'm correct, because of this I am guessing that you also have a "broken ground" (i.e. the circuit's ground wire doesn't lead back to a grounded electrode like it should) and that another device on that same circuit is defectively energizing its equipment ground (and the equipment ground of all other devices downstream like your EVSE's outlet).
Now I may be completely wrong about your situation, but what I outline above can occur, I believe, so it is worth discussing if it helps people understand a bit more how things can go wrong if your wiring isn't following code.
My guess is that your EVSE outlet is not the only one on its circuit (like is highly recommended because it avoids the scenario I'm about to describe, among other things). If I'm correct, because of this I am guessing that you also have a "broken ground" (i.e. the circuit's ground wire doesn't lead back to a grounded electrode like it should) and that another device on that same circuit is defectively energizing its equipment ground (and the equipment ground of all other devices downstream like your EVSE's outlet).
Now I may be completely wrong about your situation, but what I outline above can occur, I believe, so it is worth discussing if it helps people understand a bit more how things can go wrong if your wiring isn't following code.