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There is also a neutral that connects all the way back to the 3 phase distribution but that neutral is over a mile long on that spur with 21 transformers hanging on it so there will be voltage drop that shows up in the dirt from the pole grounding conductor and the customers GES. I have 3 amps on my neutral with the main breaker off and the pole grounds very from about 0.8a and almost 3 depending on which one you look at. Mains voltage standards evolved due to regional infrastructure, load requirements, and efficiency goals. Shifts from 110V to higher voltages reduced current and losses over long distances. Power electronics, including devices such as the FGA25N120ANTD, were developed to handle these variations safely, enabling modern converters, motor drives, and grid-connected equipment to operate reliably worldwide.