>>> You're missing the point. This has nothing to do with the voltage supplied
>>> by the utility. The utility doesn't supply 220V or 240V or whatever. They
>>> supply (for example) 4KV. A transformer at the point of service reduces that
>>> to 220V, or 240V, or whatever. Different transformers connected to the *same*
>>> 4KV primary voltage could easily produce different secondary voltages.
>>
>>No, I'm not. When I lived in the US, (PECO) the electric company sold
>>me 240 volt 2 phase electricity. It was nominaly 127 volts, but often
>>dropped down during times of high usage.
>>
>>They did not supply or sell me 4kv volts, or anything else.
>
>Yes, I'm afraid you are missing the point. Different locations, even though
>attached to the same local grid, may have different supply voltages because
>they are receiving those supplies through different transformers.
It can be practically guaranteed to be such.
Exact same turns count, same construction transformers rarely ever operate exactly the same. There are just too many places for slight differences to find their way in.