I’m in the US. Perhaps it’s different in urban settings or with different utilities, but this is my 2 wire (single hot) feed from the road and my transformer on my property that only feeds my home 200a service. This is not a 3 phase 208v service because it only carries 2 lines from the circuit on the road. The is no transformer at the road on the pole where my feed breaks off from the main circuit, again-2 lines, top hot only. Neighbors both sides are the exact same. Single family homes, 200a service, each have transformers between the drop and the main circuit.