In my opinion you already have answered your own question.
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How many homes are connected to the same power company transformer?
What size is this transformer?
The power company has a very different method of sizing conductors and transformers than the NEC does.
The power company's methods work for them and you may have to just accept the dimming lights when other loads start.
It does not take much of a voltage sag to be seen in incandescent lighting.
You may also have some loose connections at the transformer that the power company might check if you ask them to.
Bob
