In my locality there is no neutral wire. Our transmission company runs only 3 wires(all line/phase) and no neutral(4th wire) at all. Out of three, one runs to our houses. I know it sounds incorrect, but this is the case, they are saving the expense on neutral wire.
Here we use earth wire(physicaly connected to earth) in place of neutral . Each house has its own earthing/grounding. So our earth is our neutral. No difference at all. Everything works just fine, no problem at all.
I know that two wires with different potential are required to create a potential difference. I also understand that we can run loads between two phases. But in this case there is only one. Here we are running loads between a phase and a wire physicaly connected to earth.
I know that current flows in closed loop(it goes back to the source). But in this case, there is only one wire coming from sub-station and another is just physicaly grounded, how the circuit even completes? Where is the closed loop?