davewill wrote:The only difference between a neutral and a ground on a dedicated outlet is how the appliance uses it. Both are connected to ground at the breaker panel.
This is probably true if that dedicated outlet is connected to the main panel. However if the dryer outlet is fed from a subpanel there may be other loads on the subpanel that draw current through the common neutral back to the main panel. This might put voltage spikes on the neutral which could make it unsuitable as an equipment ground. Many years ago I worked in a building where the neutrals and grounds got mixed up in a subpanel. It would blow RS232 line drivers in computers connected to that subpanel when the big copy machine, also connected to that subpanel, generated a big turn-on spike. After separating the grounds and neutrals properly at the subpanel, the problem went away.
I'm not sure I'd risk my EVSE by connecting it to a 10-30 on a subpanel, but it should work fine if the 10-30 is fed from a dedicated circuit on the main panel.